Create a new header lwp_private.h to contain _lwp_getprivate_fast,
_lwp_gettcb_fast, _lwp_settcb and remove them from mcontext.h, so that:
1. we don't need special hacks to hide them
2. we can include <lwp.h> where needed to get the necessary prototypes
without redefining them locally.

Undo previous lwp.h change.

Split __lwp_getprivate_fast and __lwp_*tcb from mcontext.h into a separate
lwp.h file.

branches: 1.34.36;
Remove the kernel PMC code. Sent yesterday on tech-kern@.

This change:

* Removes "options PERFCTRS", the associated includes, and the associated
ifdefs. In doing so, it removes several XXXSMPs in the MI code, which is
good.

* Removes the PMC code of ARM XSCALE.

* Removes all the pmc.h files. They were all empty, except for ARM XSCALE.

* Reorders the x86 PMC code not to rely on the legacy pmc.h file. The
definitions are put in sysarch.h.

* Removes the kern/sys_pmc.c file, and along with it, the sys_pmc_control
and sys_pmc_get_info syscalls. They are marked as OBSOL in kern,
netbsd32 and rump.

* Removes the pmc_evid_t and pmc_ctr_t types.

* Removes all the associated man pages. The sets are marked as obsolete.

branches: 1.33.14; 1.33.16;
fenv.h for alpha

branches: 1.32.12; 1.32.30;
Pull the bus_space(9) definitions needed by alpha userland into
bus_user.h and include that from pio.h, sysarch.h, bus_defs.h. Fixes
the alpha build.

Retire varargs.h support. Move machine/stdarg.h logic into MI
sys/stdarg.h and expect compiler to provide proper builtins, defaulting
to the GCC interface. lint still has a special fallback.
Reduce abuse of _BSD_VA_LIST_ by defining __va_list by default and
derive va_list as required by standards.

Don't install alpha/bus.h any more.

Finish moving alpha over to the MI atomic ops.

branches: 1.28.12; 1.28.24; 1.28.40; 1.28.44;
Merge newlock2 to head.

branches: 1.27.4;
don't install <machine/db_machdep.h>, this is kernel only

branches: 1.26.4; 1.26.8;
merge ktrace-lwp.

branches: 1.25.12;
also add <machine/joystick.h> to alpha and amd64, to allow compilation
of certain multimedia applications

Factor out W{CHAR,INT}_{MAX,MIN} into their own header file.

branches: 1.23.2;
Merge the nathanw_sa branch.

Remove KDIR=, since SYS_INCLUDE=symlinks and KDIR are not supported any more.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Implement pmc(9) -- An interface to hardware performance monitoring
counters. These counters do not exist on all CPUs, but where they
do exist, can be used for counting events such as dcache misses that
would otherwise be difficult or impossible to instrument by code
inspection or hardware simulation.

pmc(9) is meant to be a general interface. Initially, the Intel XScale
counters are the only ones supported.

branches: 1.19.4; 1.19.8;
install fpu.h, needed for new lib/csu features

Remove alpha/include/fbio.h -- it hasn't been used for a Long Time.

branches: 1.17.2; 1.17.4; 1.17.6;
Add definitions of C99 integer format conversion macros.
XXX Fastest minimum-width integer types haven't been decided upon yet.

Add definitions of C99 specified-width integer type limits.
XXX Fastest minimum-width integer types haven't been decided upon yet.

Add definitions of C99 integer constant macros.
Tidy Makefiles up a little.

Add definitions of C99 minimum-width and greatest-width integer types.
XXX Fastest minimum-width integer types haven't been decided upon yet.

branches: 1.13.2;
Add <machine/int_types.h>, which provides namespace-pure definitions
of exact-width integer types.

Switch to the new `evcnt' mechanism for counting interrupts. Maintain
a per-CPU interrupt counter for clock, device, and interprocessor
interrupts.

branches: 1.11.2;
Oops, install <machine/lock.h> on these systems, too.

Remove local implementation switching to accelerated MI sfb.c.

Install "machineendian_machdep.h".

Install pio.h.

C99: Define a NAN macro in <math.h> which evaulates to a constant expression of
a single-precision quiet NaN; only to be defined on platforms that do support
this value.

add atomic.h (missed by thorpej; approved by thorpej)

Inline the BWX instructions.

branches: 1.4.2; 1.4.8;
* New MI man page for fp{set,get}{round,sticky,mask}(3).
* Implement fpgetsticky() for alpha.
* Direct fpsetsticky() and fp{get,set}mask() into alpha kernel via sysarch(2).
* Define new sysarch(2) stub for above and install and distribute sysarch.h
for alpha. (The fpcr IS user mode r/w, but for reasons beyond the scope
of a commit message kernel calls are needed.) And much kernel Magick is
required before these do anything, but this way programs compiled under
1.4 will DTRT on future snapshots and releases.

wsconsio.h is gone

branches: 1.2.4;
Move the bswap functions from libutil to libc (this bups the
minor of libc and the major of libutil). For little-endian architectures
merge the bnswap() assembly versions with nto* and hton* using symbols
aliasing. Use symbol renaming for the bswap function in this case to avoid
namespace pollution.
Declare bswap* in machine/bswap.h, not machine/endian.h. For little-endian
machines, common code for inline macros go in machine/byte_swap.h
Sync libkern with libc.
Adjust #include in kernel sources for machine/bswap.h.

Rework the way kernel include files are installed. In the new method,
as with user-land programs, include files are installed by each directory
in the tree that has includes to install. (This allows more flexibility
as to what gets installed, makes 'partial installs' easier, and gives us
more options as to which machines' includes get installed at any given
time.) The old SYS_INCLUDES={symlinks,copies} behaviours are _both_
still supported, though at least one bug in the 'symlinks' case is
fixed by this change. Include files can't be build before installation,
so directories that have includes as targets (e.g. dev/pci) have to move
those targets into a different Makefile.

Multiple include protection.

branches: 1.1.20; 1.1.22; 1.1.24;
New file, included if present for ${MACHINE_ARCH} by bsd.kmod.mk.

Add an alpha_fp_init() function, and move the initialization of
FP-related event counters there.

No functional change intended.

branches: 1.47.16;
- Expose alpha_fp_complete_at() to callers outside fp_complete.c.
- Use ufetch_32() instead of copyin() to fetch the instruction.

Define the f_float in-memory format. Line of the fields in s_float and
t_float.

Remove unused dot_conv() function.

branches: 1.44.6;
Add a mechanism to allow a platform to optionally shelter some region
of physical memory from random allocations from the default VM page
free list. Use this hook to shelter regions within 0-16MB of physical
RAM on Jensen and Irongate systems; those platforms do not have SGMAP
DMA, and so we need to shelter this range so that devices using ISA DMA
(e.g. floppy controller) have an opportunity to allocate DMA-safe memory.

PR port-alpha/27087

Fix cycle counter-based time keeping on Alpha in MP environments by using
a simpler calibration algorithm for the CC timecounter. Proposed in 2018
by Naruaki Etomi:

https://mail-index.netbsd.org/tech-kern/2018/01/14/msg022940.html

This patch is largely based on the proposed change, but avoids changing
any other timecounter logic, and re-factors things a bit to keep them
as MI as possible.

Qemu loads the kernel directly, and so there's no bootloader to provide
a "bootinfo" structure for us. Qemu does, however, place a Linux kernel
parameter block at kernel_text[] - 0x6000 that contains Linux-style kernel
command line arguments. So, add a prom_qemu_getenv() that allows us to
look for specific things passed along to the kernel from there, and use
them as follows:

- Support specifying the root device in the forms "root=/dev/wd0a",
"root=wd0a", or "rootdev=wd0".
- Support SRM-like -flags ... in the form of "flags=AD". In the case of
Qemu, we also assume that no flags=... is the same as "flags=A", i.e.
perform an auto-boot.

Also allow an alternate delay() function to be specified, if the platform
wishes to provide one.

prom_is_qemu -> alpha_is_qemu, and export it outside of prom.c.

Rather than having exception_return() at the root of the call graph for
kernel threads, provide a backstop that will prevent them from ever
accidentally trying to return to user space.

Clean up all of the _PMAP_MAY_USE_PROM_CONSOLE crapola, centralizing the
logic in prom.c, and rename it _PROM_MAY_USE_PROM_CONSOLE in a few places
it's still needed.

Overhaul the API used to fetch and store individual memory cells in
userspace. The old fetch(9) and store(9) APIs (fubyte(), fuword(),
subyte(), suword(), etc.) are retired and replaced with new ufetch(9)
and ustore(9) APIs that can return proper error codes, etc. and are
implemented consistently across all platforms. The interrupt-safe
variants are no longer supported (and several of the existing attempts
at fuswintr(), etc. were buggy and not actually interrupt-safe).

Also augmement the ucas(9) API, making it consistently available on
all plaforms, supporting uniprocessor and multiprocessor systems, even
those that do not have CAS or LL/SC primitives.

Welcome to NetBSD 8.99.37.

branches: 1.37.2;
s/static inline/static __inline/g for consistency.

branches: 1.36.4;
dumpconf(void) long doesn't exist, remove the prototype

PR kern/39714 by Henning Petersen

allow pcu_save() and pcu_discard() to be called on other threads,
ptrace needs to use it that way.

branches: 1.34.4; 1.34.8; 1.34.12;
Cleanup and simplify PCU FP support. Nuke MDLWP_FPUSED.

pcu(9):
- Remove PCU_KERNEL (hi matt!) and significantly simplify the code.
This experimental feature was tried on ARM did not meet the expectations.
It may be revived one day, but it should be done in a much simpler way.
- Add a message structure for xcall function, pass the LWP ower and thus
optimise a race condition: if LWP is discarding its state on a remote CPU,
but another LWP already did it - do not cause an unecessary re-faulting.
- Reduce the variety of flags for PCU operations (only PCU_VALID and
PCU_REENABLE are used now), pass them only to the pcu_state_load().
- Rename pcu_used_p() to pcu_valid_p(); hopefully it is less confusing.
- pcu_save_all_on_cpu: SPL ought to be used here.
- Update and improve the pcu(9) man page; it needs wizd(8) though.

branches: 1.32.2;
-extend the pcu(9) API by a function which saves all context on the
current CPU, and use it if a CPU is taken offline
-add a bool argument to pcu_discard which tells whether the internal
"LWP has used the coprocessor" flag should be set or reset. The flag
is reported by pcu_used_p(). If set, future accesses should use the
state stored in the PCB. If reset, it should be reset to default.
The former case is useful for setmcontext().
With that, it should not be necessary anymore to manage the "FPU used"
state by an additional MD variable.

approved by matt

branches: 1.31.2;
Update to new pcu_state_{load,save,release} definitions

branches: 1.30.6;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.29.2; 1.29.6;
Retire varargs.h support. Move machine/stdarg.h logic into MI
sys/stdarg.h and expect compiler to provide proper builtins, defaulting
to the GCC interface. lint still has a special fallback.
Reduce abuse of _BSD_VA_LIST_ by defining __va_list by default and
derive va_list as required by standards.

Oops, missed one: #include <sys/bus.h> instead of <machine/bus.h>.

Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.

Switch alpha to use PCU to manage the FPU.
Tested by mhitch and review by rmind.

branches: 1.25.2;
Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.24.4; 1.24.6; 1.24.8;
Do not use lwp_trampoline for cpu_setfunc, but a simplified setfunc_trampoline
that does not call lwp_startup() instead.

branches: 1.23.18; 1.23.28; 1.23.34;
Hook in the atomic ops on alpha.

branches: 1.22.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.21.8; 1.21.10;
merge yamt-idlelwp branch. asked by core@. some ports still needs work.

from doc/BRANCHES:

idle lwp, and some changes depending on it.

1. separate context switching and thread scheduling.
(cf. gmcgarry_ctxsw)
2. implement idle lwp.
3. clean up related MD/MI interfaces.
4. make scheduler(s) modular.

branches: 1.20.26; 1.20.30; 1.20.32; 1.20.36; 1.20.38;
merge ktrace-lwp.

branches: 1.19.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.18.2;
Merge the nathanw_sa branch.

branches: 1.17.4;
Don't need to prototype child_return() here, it's in <sys/proc.h>.

o Deal with stray machine checks
o Add for alpha a security-sensitive rate-limiting printf(9) wrapper based
on ratecheck(9): void rlprintf(struct timeval *t, const char *fmt, ...);

o IEEE 754 floating-point completion code.
o Implement the architected FP_C "Floating Point Control Quadword"

branches: 1.14.2;
Do the md_syscall, __HAVE_MINIMAL_EMUL and __HAVE_SYSCALL_INTERN thangs.

Several changes, which get us generally further along with
multiprocessor support:
- Implement MP-safe halt.
- Make the FPU saving code more like Bill's on the i386 MP branch.
XXX This code will no doubt be revisited again.
- Pass the cpu_info and trapframe to IPI handlers, saving some work
in the handlers themselves, and also making it possible for the
"pause" handler to reference register state for DDB.
- Add "machine cpu" to DDB, making it possible to reference other
CPUs registers (and thus get e.g. a traceback) from whichever
CPU is actually running the debugger.
- Garbage-collect "machine halt" and "machine reboot" DDB commands.
They don't have a prayer of working properly in multiprocessor
kernels, and didn't really work all that well in uniprocessor kernels.

Define the biglock perimeter for the Alpha port, and generally clean
up a bunch of the MP code. Still doens't work properly yet, this is
just a snapshot of work-in-progress.

Implement MP-safe lazy FP context switching, modeled on the
way Bill Sommerfeld implemented it for x86 (and bug fixes
fed back to Bill :-)

branches: 1.10.2;
And more ANSI'ification!

Add a global patchable variable to enable debugging printfs in the
code that finds the boot device.

branches: 1.8.2;
Remove duplicate CTL_MACHDEP definitions (duplicated in <alpha/cpu.h>).

Put machine check info in cpu_info in the multiprocessor case, and
just have one statically allocate machine check info structure in the
single processor config case.

branches: 1.6.2;
Centralize the declaration and clearing of `cold'.

New signature for console_restart().

Prototype dot_conv(), new routine in machdep.c that formats an alpha
long like this: e081.8000.8000.0004

Move the inclusion of <machine/bus.h> to within a _KERNEL section.

branches: 1.2.2; 1.2.4; 1.2.6;
Now that we have the kthread mechanism, massively clean up the way
additional processors are spun up on multiprocessor Alpha systems.
Now, each processor gets its own idle thread (the primary processor
uses proc0). This idle thread is used in switch_exit(), rather than
explicitly referencing proc0.

Also, make `curproc', `fpcurproc', and `curpcb' per-cpu values. This
required some data structure rearrangement; cpu info is now statically
allocated in the BSS, rather than via malloc(), and cpu_softc is gone.
(Modeled somewhat after NetBSD/sparc's multiprocessor info structures.)

New module to hold the alpha-specific prototypes that don't need to be
exported to the MI kernel. Almost everything here was formerly in cpu.h.
Optionally, this module could in the future be used to #include anything
that is always needed by arch/alpha modules.

Make alpha_wmb() actually a WMB rather than an MB (all uses of
alpha_wmb() have been audited and fixed-up as necessary).

In order to prevent _mcount() from being recursively called when built with COPTS=-O0,
sprinkle `__always_inline' to make _mcount() be generated as a single function.

Define the arithmetic exception summary bits passed in a0 to entArith.

branches: 1.53.6; 1.53.8;
Fix the bit position for the PMI bit in ALPHA_AMASK_BITS.

Add alpha_pal_wtint(), which invokes the WTINT PALcode call.

- Document all of the various interrupt levels in the Processor Stataus
register, and provide symbolic names for them as well.
- Use ALPHA_PSL_IPL_* values directly for IPL_*.

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.49.8; 1.49.12;
Enable Pchip and Cchip error interrupts (machine checks) on DEC 6600
systems. Add some basic pretty-printing for those errors. Tested on
a DS20.

branches: 1.48.72; 1.48.92; 1.48.94;
Change "inline" back to "__inline" in .h files -- C99 is still too
new, and some apps compile things in C89 mode. C89 keywords stay.

As per core@.

branches: 1.47.2; 1.47.4; 1.47.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

merge ktrace-lwp.

Added a new AMASK bit (ALPHA_AMASK_PMI) and a new IMPLVER family ID:
ALPHA_IMPLVER_EV7.

ok christos@

branches: 1.44.2; 1.44.18;
Merge the nathanw_sa branch.

Add a memory clobber to alpha_pal_swapctx() and alpha_pal_swpipl();
the former affects the address space, and the latter can let interrupt
handlers in to clobber memory.

branches: 1.42.2;
Protect userland from the inlines and kernel variable decls.

branches: 1.41.6;
And more ANSI'ification!

ANSI'ify.

branches: 1.39.2;
Fix a typo in a previous revision, and add bit names for amask bits for
use with bitmask_snprintf().

Update the amask bits.

Use ANSI-style function declarations for the various inline functions
here. Addresses port-alpha/9056.

Inline most of the remaining PALcode calls.

Inline the BWX instructions.

Move atomic operations into <machine/atomic.h>, and make them in-line
assembly, rather than function calls.

...except alpha_atomic_testset_l(), which will go away completely once
I commit the new <machine/lock.h>.

After reading the GCC `documentation' a little more, improve the inline
__asm() statements added previously for PALcode operations.

Inline several things from pal.s:
- alpha_rpcc(), alpha_mb(), alpha_wmb() -- these are instructions, and
we win by inlining them: rpcc is generally used for profiling, and
the memory barriers really should execute as quickly as possible with
minimal side-effects (like additional loads/stores required to call the
functions!)
- alpha_pal_imb(), alpha_pal_rdps(), alpha_pal_swpipl(), alpha_pal_tbi(),
alpha_pal_whami() -- these are PALcode ops. We must specify some register
clobbers for these.

We have a very decent size savings as a result. My test system:
text data bss dec hex filename
2671724 235848 377016 3284588 321e6c /netbsd.bak
2617708 235736 377016 3230460 314afc /netbsd

Most of this comes from fewer register saves/restores around spl*() calls
(now that alpha_pal_rdps() and alpha_pal_swpipl() are inlined).

Note that alpha_pal_rdps() and alpha_pal_swpipl() remain in pal.s to
maintain binary compatibility with LKMs that may use spl*() functions.

Implement atomic addition and subtraction on quadwords.

branches: 1.30.12; 1.30.18;
Implement atomic quadword load-and-latch.

The processor unique value in the PCB is used as a backup kernel stack
pointer when booting secondary CPUs. Add an alias for it.

Implement atomic test-and-set for longwords (32-bit).

"Gee, there was already a function to do that."

Implement a function to recompute the HWRPB checksum.

Implement quadword atomic test-and-set.

Add definitions for the maximum allowable `whami' procssor ID and the
maximum number of processors we'll allow (64, assuming procssor IDs start
at 0).

vm_offset_t -> {paddr_t,vaddr_t}, vm_size_t -> vsize_t

stale beer- place structure in right file

Define a shorthand macro that represents the mask of PTE bits that the
PALcode cares about.

Cosmetic change.

Add machine check type definitions. Structure the expected/received
machine check items.

Implement a set of `atomic' (using load-locked and store-conditional)
operations. Initial set includes:

alpha_atomic_setbits_q() set bits in a quad
alpha_atomic_clearbits_q() clear bits in a quad

Implement alpha_pal_swpctx().

Rewrite the way the platform model string is determined:
- Attempt to find the model string in the HWRPB's DSR area. Failing that
(if the HWRPB version is too old)...
- Look up the system variation in a variation/string table. Failing that
(unknown variation)...
- Create a default model string using the variation number.

Also, factor out a bunch of common code.

Add some defines for alpha interrupt types.

Prototype alpha_implver(), and fix a think-o in a previous commit.

Add stubs for the Alpha Byte/Word Extension (BWX) instructions, present
on EV56 and later processors that have the "amask BWX" bit clear. These
instructions will be used to implement non-swizzle bus access functions
on newer systems, such as the new AlphaStation 500s with EV56 and 21172
PCI chipsets.

See "Alpha Architecture Handbook, Version 3", DEC order number EC-QD2KB-TE.

- Define bits used in the "amask" instruction.
- Define processor family IDs returned by the "implver" instruction.
- Prototype alpha_amask().

branches: 1.11.2;
Add a few more PALcode operations, as documented in pages (II-B) 2-1 through
(II-B) 2-33 of the Alpha AXP Architecture Reference Manual, Second Edition:

* rdps - Read Processor Status, needed by spl* functions.
* cflush - Cache Flush
* rdval - Read System Value
* wripir - Write Interprocessor Interrupt Request
* wrval - Write System Value

cflush, rdval, wripir, and wrval are used in multi-processor environments.

Fix a typo: ALPHA_PTE_WRITE needs to include the "user write" bit.

branches: 1.9.2;
comment out text after #endif. "Pasto!" pointed out by Kevin Sullivan
in PR 3529.

clean up NetBSD RCS ID strings

branches: 1.7.2;
make ALPHA_K0SEG_TO_PHYS and ~0xfffffc00000000000 with the address,
rather than and-ing 16G-1. That just strips the k0seg bits, rather
than making the false assumption that the physical address is going
to be in the lower 16G. That doesn't apply for CIA device-space
addresses, for instance.

K0SEG_END is inclusive

rename translation buffer invalidation macros to start with ALPHA_,
like all other macros defined in alpha_cpu.h.

(1) Remove old trap definitions, define trap and interrupt handling
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Restructure and improve machine check and correctable error
handling based on information in the 2nd Ed. of the Alpha Architecture
Reference Manual.
(3) Removed unused (and not likely useful) PALcode assembly stubs.

Instead of treating the trap/syscall/exception frame like a struct
containing a substruct (the hardware frame) and an array of registers,
treat it like one big array of registers, for easier and prettier
access. Update everything to deal with that.

Add definitions for:
Process Control Block
Interrupt/Exception/Syscall Stack Frame
Machine Check Error Summary Register
Machine Check Logout Area
clean up some, and add prototypes for all of the CPU instruction and
PALcode function stubs.

definitions and constants which are part of the Alpha AXP
Architecture, and which relate to the OSF/1 PALcode.

Expose alpha_print_instruction_context to not-_KERNEL.

Move alpha/alpha/db_instruction.h -> alpha/include/alpha_instruction.h

Switch all users (except ia64) of custom machine/ansi.h to common_ansi.h

Deduplicate the code among ports and poll definitions of types
directly from a compiler.

This fixes miscompilation of certain programs that instruct compilers
to generate code for different types. This bug has been detected with
-fshort-wchar in EFI firmware.

Proposed and discussed on a mailing list (twice).

Itanium uses custom !ELF fallback switch, temporarily leave it as it is.

branches: 1.25.18;
Make clock_t unsigned

branches: 1.24.12; 1.24.28; 1.24.30;
Retire varargs.h support. Move machine/stdarg.h logic into MI
sys/stdarg.h and expect compiler to provide proper builtins, defaulting
to the GCC interface. lint still has a special fallback.
Reduce abuse of _BSD_VA_LIST_ by defining __va_list by default and
derive va_list as required by standards.

1. {wctype,wctrans,mbstate}_t: switch MD to MI like other
libc implementation (such as *BSD and glibc2).

2. don't typedef void * wc{type,trans}_t, suggested by soda@-san.
it may pass through compiler type check, it's harmful.
so i introduce dummy struct __tag_wc{type,trans}_t(iconv_t already does).

no ABI change was made.

branches: 1.22.4; 1.22.6;
merge christos-time_t

branches: 1.21.16; 1.21.18; 1.21.22; 1.21.30;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

clean up some definitions around rune_t which are not needed anymore

branches: 1.19.8; 1.19.16; 1.19.22; 1.19.26; 1.19.28;
fix gcc -Werror -Wmissing-braces problem
mbstate_t(this is opaque object)'s initializer should be ``{ 0 }'',
so changed 1st field of union from character array to integer.

branches: 1.18.20; 1.18.22;
merge ktrace-lwp.

branches: 1.17.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.16.2;
add some ISO C 1995 I18N functions and types:
btowc, wctrans, towctrans, wcscoll, wcsxfrm, wctype_t and wctrans_t.

replace 'long long' with int64_t to compile stand alone program with
compiler other than GCC.

make mbstate_t bigger (32 -> 128 bytes).
XXX if you have libc after citrus locale import, please recompile libc,
and your applications that use mbstate_t (rather rare). really sorry
for the mess.

populate _BSD_MBSTATE_T_. add warning regarding to rune_t.

G/c _BSD_INTPTR_T_ and _BSD_UINTPTR_T_.

branches: 1.11.2;
Make stdarg/varargs work with GCC 2.96.

branches: 1.10.14;
Provide definitions for intptr_t and uintptr_t, signed resp. unsigned integral
types large enough to hold any pointer.

Add _BSD_SUSECONDS_T_ and _BSD_USECONDS_T_; do some space vs. tab formatting
cleanup

clean up NetBSD RCS ID strings

Make the names of the member of struct __va_list namespace-clean.

branches: 1.6.2;
Define _BSD_CLOCKID_T_ and _BSD_TIMER_T_

change __va_list's "offset" field to be a 'int' to match what gcc now
uses, plus add a compatibility hack so that code compiled with old
versions of gcc (e.g. libraries) can work with code compiled with
new versions.

Add _BSD_WINT_T_ definition so we can handle wint_t type added in NA1.

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

update for NetBSD's header standards, kill OSF/1 cc hacks.

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.3.146; 1.3.150;
Rename __LDPGSZ to AOUT_LDPGSZ, to accurately reflect what it is.

branches: 1.2.34;
clean up NetBSD RCS ID strings

branches: 1.1.2;
preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

alpha/asm.h: Respect _NETBSD_REVISIONID.

alpha: Add missing barriers in cpu_switchto.

Details in comments.

PR kern/57240

XXX pullup-8
XXX pullup-9
XXX pullup-10

branches: 1.44.20;
Use SysValue to store curlwp rather than curcpu. curlwp is acceessed
much more frequently, and this makes curlwp preemption-safe.

Missed one in last change.

Garbage-collect GET_CPUINFO; it's no longer used.

- Make the GET_CURLWP actually return curlwp, not &curlwp.
- exception_return(): Use GET_CURLWP directly, rather than a dance
acount GET_CPUINFO.
- Introduce SET_CURLWP(), to set the curlwp value.
- Garbage-collect GET_FPCURLWP.

The only remaining consumer of curpcb was the PROM mapping code, for if
PROM console routines are being used (only on KN8AE). We have access to
the sam information via curlwp, so use that, and eliminate the need to set
cpu_info::ci_curpcb when context switching, which saves an extra all into
PALcode.

G/C GET_IDLE_PCB -- it hasn't been used for some time.

Fix copy & pasto in previous (to fix the build)

Mark the .ident section as mergable string section to avoid redundant
entries.

branches: 1.36.16; 1.36.26;
Undo; the correct fix was applied in csu/arch/alpha/crtbegin.h

Avoid stupid gcc redefinition warnings by #undef before redefine.

branches: 1.34.8; 1.34.12;
Add a RCSID macro for non _KERNEL use

branches: 1.33.6; 1.33.10;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.32.4; 1.32.8;
Use .pushsection/.popsection for __KERNEL_RCSID/__KERNEL_COPYRIGHT.
Add an explicit .text to linux_sigcode.s

branches: 1.31.2; 1.31.4;
Consistently use .gnu.warning with .pushsectio and .popsection on all
architectures instead of obsolete STABS frames for linker warnings.

branches: 1.30.70;
Merge newlock2 to head.

branches: 1.29.18;
Add a STRONG_ALIAS macro

branches: 1.28.2;
merge ktrace-lwp.

branches: 1.27.16;
netbsd.org -> NetBSD.org

All "netbsd.org" is now gone from src/sys/arch.

branches: 1.26.16;
We haven't done ECOFF for a long time; garbage-collect all the
__ELF__ #ifdefs (thus setting ELF in stone).

Disable .loc in macros for now; the new assembler is a lot more
picky about having the file number defined.

The return address register ($ra) is callee-saved, not caller-saved.

branches: 1.23.2; 1.23.4;
Add a WEAK_ALIAS() macro.

branches: 1.22.10; 1.22.20;
Implement WARN_REFERENCES().

Since libc is not ready for enabling weak symbol support yet, disable the
WEAK_ALIAS() macro for now (like cdefs.h).

Macros to call a linux syscall.

Get rid of a /* in a comment.

--Add handcrafted stack frame directives to locore.s palcode vector
--entries / remove kernel entry from locore / reorganize vector entry
--code. Enables access to stack frames transitively w.r.t. palcode
--vectors, e.g. upward traceback works, inverting (possibly several)
--kernel vectors. Until now, all trackbacks ended at the first-reached
--instance of trap(), which was totally useless as there is no mystery
--to trap->panic->cpu_reboot

branches: 1.17.4;
Split off PALcode functions into their own header file.

Define PAL_cflush, PAL_ipir, and PAL_OSF1_wrperfmon PALcode operations.

branches: 1.15.4;
clean up some ELF vs. ECOFF bogons

align after RCS ID strings if placing them in text

include RCS IDs for assembler files, disabled with NO_KERNEL_RCSIDS

clean up NetBSD RCS ID strings

branches: 1.11.2;
PROF -> GPROF

add a WEAK_ALIAS macro if building on an ELF-capable system, which creates
a weak alias for a symbol.

Add __CONCAT and ___CONCAT to concatenate identifiers. Add LLABEL to
create an assembly label, and SYSCALLNUM to convert a syscall name into
the macro that's defined to be its number. Add a CALLSYS_NOERROR macro
which invokes the named system call. (CALLSYS_NOERROR is here since
it's used in locore, for sigcode.)

backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

simplify profiling entry. add 'label' argument tp PANIC, PRINTF, and MSG,
which is the label that the message string should be stored with.

clean up comments, add OSF/1 rdmces and wrmces PALcode function calls.

update copyright

use jmp, rather than br, in the JMP macro

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

Finish moving alpha over to the MI atomic ops.

branches: 1.9.36; 1.9.50; 1.9.70; 1.9.74;
inline -> __inline

Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

branches: 1.7.32;
Fix constraints in __asm statements (err, again). Kernels compiled
with GCC 2.95.3 work now.

branches: 1.6.2; 1.6.4;
Oops, properly mark a memory operand as both an input and an
output as necessary.

branches: 1.5.4; 1.5.6;
ANSI'ify.

branches: 1.4.2;
Rename the atomic operations to have generic machine-independent
names, and define __HAVE_ATOMIC_OPERATIONS to indicate their
existence.

Use ANSI-style function declarations for the various inline functions
here. Addresses port-alpha/9056.

branches: 1.2.2;
Remove now-obsolete atomic operations.

Move atomic operations into <machine/atomic.h>, and make them in-line
assembly, rather than function calls.

...except alpha_atomic_testset_l(), which will go away completely once
I commit the new <machine/lock.h>.

Re-factor the boot device and consinit routines into common functions
per platform type (PCI vs TC), eliminating a bunch of copy-pasta.

branches: 1.23.84;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.22.112; 1.22.116;
merge ktrace-lwp.

Centralize the declaration of booted_device and booted_partition.

branches: 1.20.2;
Fix a grammatical nit.

And more ANSI'ification!

Switch to the new `evcnt' mechanism for counting interrupts. Maintain
a per-CPU interrupt counter for clock, device, and interprocessor
interrupts.

Make booted_device global (and booted_parition for consitency).
Eliminate it from header files and other extern definitions.

branches: 1.16.14; 1.16.22;
Garbage-collect the old confargs stuff that was used in the Early Days.
It isn't really appropriate anymore. Replace it with a real mainbus
attach args structure.

Clean up some historical artifacts.

Clean up kernel initialization. Use the bootinfo structure (or innate
knowledge) earlier, and gather all information needed earlier. Mark the
init code carefully re: when it can print stuff out, when it can expect
the firmware to stop working, etc. Be more careful about using the PROM
console and other PROM facilities, and hint that in the future all use
of firmware/boot program callbacks by the kernel should go away (since
the world may not be mapped the way the firmware/boot program wants!).

Define a lookup table for Alpha platform variation names.

clean up the way bootinfo information is passed and used: move the version
number passed by the boot block into a register, change the kernel's
bootinfo handing so that it always uses bootinfo to get bootinfo-ish values
(filling them in if the boot blocks didn't pass them), and make versioning
a small bit more sane.

clean up bootinfo v1 struct a bit: add a hwrpb size field (in a backward-
compatible way), and clean up the comments to make things a bit clearer.

branches: 1.10.2;
fix comment glitch in the last change

clean up bootinfo structure comments so they're more readable (to me,
at least 8-). Add structure offssets for structure members, so we
know how much space we're using. Make the version in the bootinfo
structure be a u_long, so there's no implicit padding in the structure.
Add a few more pointers to the bootinfo v1 structure, which will all
be set to NULL for now.

Define the bootinfo magic number and bootinfo (version 1) structure.

clean up NetBSD RCS ID strings

branches: 1.6.2;
compile cleanly with:
-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual

(1) Clean up interrupt handling slightly.
(2) Clean up badaddr() definition.

clean up copyright notices

boot device autodetection, using PROM's boot device environment variable.
This is a bit of a hack, as-is, since there's a lot of code that's
outright duplicated between the various files and because it doesn't
support detection of a network device as the root device. The
latter's not a problem yet, because NetBSD/Alpha can't load the kernel
from the network to begin with.

branches: 1.2.4;
wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

Include <sys/bswap.h> for function prototypes. i386, pc532 and vax
still include <machine/byte_swap.h> and define macros for some of
the bswap*() functions.

Move the bswap functions from libutil to libc (this bups the
minor of libc and the major of libutil). For little-endian architectures
merge the bnswap() assembly versions with nto* and hton* using symbols
aliasing. Use symbol renaming for the bswap function in this case to avoid
namespace pollution.
Declare bswap* in machine/bswap.h, not machine/endian.h. For little-endian
machines, common code for inline macros go in machine/byte_swap.h
Sync libkern with libc.
Adjust #include in kernel sources for machine/bswap.h.

On alpha, good-bye <machine/bus.h>.

Remove clause 3 and 4 from TNF licenses

branches: 1.53.40; 1.53.42; 1.53.44;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

add a pair of new bus_dma(9) functions:
int _bus_dmatag_subregion(bus_dma_tag_t tag,
bus_addr_t min_addr,
bus_addr_t max_addr,
bus_dma_tag_t *newtag,
int flags)
void _bus_dmatag_destroy(bus_dma_tag_t tag)

that allow a (normally broken/limited) device to restrict the bus address
range it can talk to. this is used by bce(4) to limit DMA addresses to
1GB range, the maximum the chip can address.

all this is from Yorick Hardy <yhardy@uj.ac.za> with input from several
people on tech-kern.

XXX: bus_dma(9) needs an update still.

branches: 1.51.26;
merge ktrace-lwp.

branches: 1.50.4;
Add a dm_maxsegsz public member to bus_dmamap_t. This allows a user of the API
to select the maximum segment size for each bus_dmamap_load (up to the maxsegsz
supplied to bus_dmamap_create). dm_maxsegsz is reset to the value supplied to
bus_dmamap_create when the dmamap is unloaded.

branches: 1.49.2; 1.49.10; 1.49.12;
Handle 64bit DMA addresses on PCI for platforms that can (currently only
enabled on amd64). Add a dmat64 field to various PCI attach structures,
and pass it down where needed. Implement a simple new function called
pci_dma64_available(pa) to test if 64bit DMA addresses may be used.
This returns 1 iff _PCI_HAVE_DMA64 is defined in <machine/pci_machdep.h>,
and there is more than 4G of memory.

Introduce BUS_DMA_NOCACHE, and bus_dmamem_map() of i386 supports it.

Keep track of which DMA window was actually used to map the
request (not always the passed in DMA tag if we try direct-map
and then fall back to sgmap-mapped). Use the actual window
when performing dmamap_sync and dmamap_unload operations.

Fixes DMA resource leak on systems with 2G+ RAM. Thanks to
Matt Thomas for help debugging this.

Implement bus_space_mmap().

branches: 1.45.2;
Add BUS_DMA_READ and BUS_DMA_WRITE flags, that hint the back-end
at dmamap load time that the mapping will be used for a unidirectional
transfer of the specified direction.

Simplify the SGMAP code a bit, and move SGVA allocation out of a
common routine into the individual load routines, since each load
routine needs to muddle with the "internals" of this operation.

Add a `prefetch threshold' member to the bus_dma_tag_t, so that
eventually we can determine whether or not to allocate a spill
page on a per-mapping basis.

branches: 1.43.2;
constraint, not contraint.

Add the BUS_DMA_STREAMING flag.

branches: 1.41.2;
Define bus_space_*_stream_N functions as their non-stream counterparts.

Change the kernel mmap interface so that the offset to map is an
"off_t" and the return value is a "paddr_t" to allow mappings
at offsets past 2^31 bytes. Somewhat inspired by FreeBSD, which
only changed the offset to a "vm_offset_t".

Includes updates for the i386, pc532 and sh3 mmmmap from Jason Thorpe.

branches: 1.39.2;
And more ANSI'ification!

branches: 1.38.2;
implement bus_space_vaddr()

explicitely #include <sys/systm.h> #if BUS_SPACE_DEBUG to get a printf()
prototype

Pull in <sys/types.h> for the benefit of those things which include
<machine/sysarch.h> but don't pull in <sys/types.h>.

- Add a bus space method for getting the translation for a window.
- Add sysarch methods for "get bus window count", "get bus window",
and "pci conf read/write".

These are a hack, but they're what's necessary in order to make
XFree86 work in its current state.

Protect a few things from userland with _KERNEL.

Add an internal bus space method alpha_bus_space_translate(), which
provides a method to translate an address on an I/O bus into a sysBus
address, along with acccess method information.

Implement an internal DMA map flag which prevents coalescing of
adjacent DMA segments.

define a "BUS_SPACE_MAP_PREFETCHABLE" flag which basically means that
device accesses are idempotent (but should not be cached by the CPU)

Slight changes so that bounce buffers can be implemented for the Jensen.

branches: 1.29.2; 1.29.8;
nuke current definitions provided by __BUS_SPACE_COMPAT_OLDDEFS.
I'll do what I can to make new ones soon. 8-)

branches: 1.28.2; 1.28.4;
Add a macro to check for sufficient pointer alignment in bus.h context,
"BUS_SPACE_ALIGNED_POINTER()".
Equal to the param.h "ALIGNED_POINTER()" normally, but obeys additional
requirements of the bus_space_xxx_n() macros. (BUS_SPACE_DEBUG)

Well, sizeof needs to be printed with a %lu- I guess not many people build
debug kernels!

don't define __BUS_SPACE_COMPAT_OLDDEFS by default. As stated in
bus_space(9), if drivers want it (they shouldn't; easy to convert) they
can define it right before including bus.h. There's been a release since
the interfaces were (slightly) changed, and no code in the source tree
uses the old interfaces as far as I can tell.

Provide a hook for bypassing space accounting, needed to support ISA PnP
for now.

branches: 1.24.2;
Add debugging support to the bus_space macros. If BUS_SPACE_DEBUG (or DEBUG)
is defined, the bus_space macros will check to ensure that the bus address
and the target buffer (if applicable) are aligned properly for the size
of the type being used. If they are not, a message will be displayed on
the console.

Strict alignment is required by the Alpha architecture, and a trap will
occur of unaligned access is performed. These changes will aid debugging
of broken device drivers.

Allow the DMA tag to specify a boundary contraint. If the device has a
more strict boundary, the map will use it, otherwise the map will inherit
the tag's, unless the tag's constraint is 0 (no boundary constraint).

Add support for chaining DMA windows together, for falling back on
SGMAPs if a direct-mapped window fails.

Simplify the direct-mapped DMA case somewhat by adding a window base
member to the DMA tag, and calling the direct-mapped back-ends directly,
rather than through chipset-specific front-ends which pass the window
base as an additional argument.

The _dmamap_sync method is no longer optional.

Add offset and length parameters to bus_dmamap_sync(), used for specifiying
partial syncs of a DMA mapping.

Change the last argument of bus_dmamap_sync() from bus_dmasync_op_t to int,
and allow more than one synchronization operation to be specified in
a single call. Dissallow mixing of PRE and POST operations.

Add dm_mapsize to bus_dmamap_t and rename BUS_DMAMEM_NOSYNC to
BUS_DMA_COHERENT.

Put SGMAP-related stuff in the DMA map structure directly, rather than
indirecting through a pointer.

branches: 1.15.2;
don't define __BUS_SPACE_COMPAT_OLDDEFS if it's already been defined

branches: 1.14.2;
when i was documenting the bus_space interfaces (the document
was sent to developers, but will eventually become a man page or
something), i noticed a few in various names:
(1) _map and _alloc should take a flags argument, rather than a
'cacheable' boolean.
(2) BUS_BARRIER_* flags should be BUS_SPACE_BARRIER_*.
(3) bus_space_copy_* should be bus_space_copy_region_* for consistency
with other region ops.
Fix all of these (in a backward-compatible way, at least for now). Redefine
internal usees of those names to use the new names. Also, while at it,
clean up the copy functions (remove unnecessary variables) and make sure
that they and other functions conform to the spec.

bus_dmamap_t's always have a pointer to an sgmap cookie. (oops, forgot
to commit this to the branch!)

Pull thorpej-bus-dma branch into mainline.

branches: 1.11.2;
clean up NetBSD RCS ID strings

branches: 1.10.2;
implement bus_space_copy_*().

move barrier operation definition closer to the top of the bus space ops
structure. In the implementations, allow the barrier op to be inlined.

implement bus_space_set_multi_* and bus_space_set_region_* operations.

#ifdef DEBUG, check {read,write}_{multi,region} ops' pointer arg for alignment.

clean up the recent reimplementation, and kill several bogons in the new
definitions.

update alpha bus.h for new bus space interfaces. chipsets haven't
been updated yet, and the hacked DMA vto(busphys) macro is gone and
hasn't yet been replaced.

implement bus_mem_subregion() and bus_io_subregion().

gross hack to get around the fact that there are currently devices with
common back-ends that live on multiple very-different busses (e.g. PCI and
TC), which need bus-specific DMA mapping support. As a nice side effect,
this will allow the especially nasty (vtophys(va) | 0x40000000) expressions
to go away in favor of less nasty bus-specific function calls.

branches: 1.2.4;
define bus_io_{read,write}_multi_{1,2,4,8} functions, which read/write
multiple values from a single I/O port in to/out of an array of values.

the Alpha implementation of <machine/bus.h>

Allow for the SGMAP implementation to specify a minimum alignment for
SGMAP DMA segments. If not specified, PAGE_SIZE will be used, as before.

branches: 1.5.12;
Provide PRIxBUSADDR, PRIxBUSSIZE, PRIuBUSSIZE, and PRIxBSH for all arches
to follow arm and (generic) mips.

Reviewed by christos.

branches: 1.4.6;
spelling (DEC called it "TURBOchannel")

branches: 1.3.6; 1.3.24;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.2.2; 1.2.6;
Pull the bus_space(9) definitions needed by alpha userland into
bus_user.h and include that from pio.h, sysarch.h, bus_defs.h. Fixes
the alpha build.

Per discussion at
<http://mail-index.netbsd.org/tech-kern/2010/04/02/msg007941.html>,
divide each machine's bus.h into bus_defs.h (constants & data types)
and bus_funcs.h (macro implementations of bus_space(9) routines and MD
prototypes).

Note that some bus_space(9) routines' implementation will move to .c
files from inline subroutines or macros in .h files.

I've only made the split for machine architectures where there is PCI.
All of the non-PCI-having architectures will require a similar split.

These #include files are not referenced by any (committed) Makefiles or
header files, yet. Changes to Makefiles, to <sys/bus.h>, and to some
more machine-dependent files will dribble in before I throw the switch.

Add some bus_dma instrumentation.

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.1.2; 1.1.6;
Per discussion at
<http://mail-index.netbsd.org/tech-kern/2010/04/02/msg007941.html>,
divide each machine's bus.h into bus_defs.h (constants & data types)
and bus_funcs.h (macro implementations of bus_space(9) routines and MD
prototypes).

Note that some bus_space(9) routines' implementation will move to .c
files from inline subroutines or macros in .h files.

I've only made the split for machine architectures where there is PCI.
All of the non-PCI-having architectures will require a similar split.

These #include files are not referenced by any (committed) Makefiles or
header files, yet. Changes to Makefiles, to <sys/bus.h>, and to some
more machine-dependent files will dribble in before I throw the switch.

Provide PRIxBUSADDR, PRIxBUSSIZE, PRIuBUSSIZE, and PRIxBSH for all arches
to follow arm and (generic) mips.

Reviewed by christos.

branches: 1.2.18;
use __paddr_t since this is a userland API.

branches: 1.1.12; 1.1.30;
Straggler from last: add bus_user.h to the repository.

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.6.34; 1.6.38;
Remove clause 3 and 4 from TNF licenses

branches: 1.5.68; 1.5.70; 1.5.72;
Change "inline" back to "__inline" in .h files -- C99 is still too
new, and some apps compile things in C89 mode. C89 keywords stay.

As per core@.

branches: 1.4.2; 1.4.4; 1.4.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

branches: 1.3.4; 1.3.44;
ANSI'ify.

branches: 1.2.2;
Use ANSI-style function declarations for the various inline functions
here. Addresses port-alpha/9056.

branches: 1.1.2;
Inline the BWX instructions.

Make all __ALIGNBYTES macros return the same type (size_t)

branches: 1.12.6; 1.12.10;
Change CMSG_SPACE and CMSG_LEN to provide Integer Constant Expressions
again. This was changed in sys/socket.h r1.51 to work around fallout
from the IPv6 aux data migration. It broke the historic ABI on some
platforms. This commit restores compatibility for netbsd32 code on such
platforms and provides a template for future changes to the CMSG_*
alignment. Revert PCC/Clang workarounds in postfix and tmux.

branches: 1.11.182; 1.11.186;
Garbage-collect.

Bug fixes and cleanup from Chris Demetriou <cgd@pa.dec.com>:
- fix _C_LABEL so that it actually works.
- make __RENAME use _C_LABEL.
- fix __RENAME so that it expects an unquoted argument.
- fix __indr_reference and __warn_references so that they
supply their own final semicolon.
- define __warn_references to nothing if not GNU C (required
by the way it's used).

The __warn_references semicolon change has to be made
so that __warn_references can be defined into nothing.
(A ; all by itself isn't a great idea.) The __indr_reference
change was made for consistency.

Implement __RENAME() in <machine/cdefs.h>

branches: 1.8.8;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings

disable weak aliases in libc until something actually uses them. When
using __weak_alias in libc, __indr_reference should probably be defined
to do nothing (but defined, so that duplicate functions/variables aren't
compiled). However, when not using __weak_alias, __indr_reference causes
them to be omitted completely, which is a lose. So, until weak aliases
are going to be used, don't define __weak_alias or __indr_reference.

branches: 1.5.2;
don't forget to switch back to the .text after emitting warning
strings in their own sections.

add support for ELF toolchain, including weak alias support (for upcoming
libc changes) and reference warnings.

kill misnamed __indr_references() macro, that would have broken things
if it _had_ been properly named.

make an __indr_references macro, that expands to nothing...

update for NetBSD's header standards, kill OSF/1 cc hacks.

remove reference to gatekeeper.dec.com ftp.

spelling (DEC called it "TURBOchannel")

branches: 1.2.206; 1.2.226;
clean up NetBSD RCS ID strings

branches: 1.1.2;
Preliminary CFB support. Does not work as machine's console (for two
reasons: it won't attach as console, and there's currently no way to do
keyboard input on TC machines), and has no real RAMDAC (colormap, cursor,
etc.) support. Digital UNIX does not support CFB frame buffers in the
Alpha, but they appear to work OK (with an appropriate monitor) in my
3000/300.

remove redundant header, now that ECOFF_SEGMENT_ALIGNMENT macro for
<sys/exec_ecoff.h> is fixed.

clean up copyrights and RCS IDs

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

branches: 1.5.2;
Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

branches: 1.4.6; 1.4.8; 1.4.20;
add decls for fd driver.

branches: 1.3.14;
cdev_decl the "zs" device (which is really zstty).

branches: 1.2.2;
Centralize cdev_decl() for these MI drivers + a12dc in machine/conf.h (cgd)
(This does not introduce any config or option dependencies.)

branches: 1.1.2;
add machine/conf.h, right now a minimal placeholder

Add machdep.rpb_type and machdep.rpb_variation sysctl nodes.

If not _KERNEL, include <stddef.h> to make sure we have offsetof().

Improved the performance of kernel profiling on MULTIPROCESSOR, and possible to get profiling data for each CPU.

In the current implementation, locks are acquired at the entrance of the mcount
internal function, so the higher the number of cores, the more lock conflict
occurs, making profiling performance in a MULTIPROCESSOR environment unusable
and slow. Profiling buffers has been changed to be reserved for each CPU,
improving profiling performance in MP by several to several dozen times.

- Eliminated cpu_simple_lock in mcount internal function, using per-CPU buffers.
- Add ci_gmon member to struct cpu_info of each MP arch.
- Add kern.profiling.percpu node in sysctl tree.
- Add new -c <cpuid> option to kgmon(8) to specify the cpuid, like openbsd.
For compatibility, if the -c option is not specified, the entire system can be
operated as before, and the -p option will get the total profiling data for
all CPUs.

Various minor cleanups and bug fixes to the FP software completion code:
- Use __CTASSERT() instead of rolling our own compile-time assertion
using cpp.
- Use __BIT() &c instead of rolling our own.
- Improve some comments.
- Define a default FP_C and FPCR value that is self-consistent, and
initialize it properly at process creation time.
- Fix signal information when the trap shadow cannot be resolved.
- Use defined constants rather than magic numbers for the exception
summary bits.
- Add a machdep sysctl to enable FP software-completion debugging.

Fix typo in comment

branches: 1.101.2;
Slight tweak to previous changes:

Rather than simply increment the interrupt depth for the clock interrupt,
we add 0x10. Why? Because while we only use a single Alpha IPL (4) for
IPL_{BIO,NET,TTY,VM}, technically the architecture specification suports
two in the OSF/1 PALcode (3 [low-pri] and 4 [high-pri]), meaning we could
conceiveably have intrdepth > 1 just for device interrupts.

Adding 0x10 here means that cpu_intr_p() can check for "intrdepth != 0" for
"in interrupt context" and CLKF_INTR() can check "(intrdepth & 0xf) != 0" for
"was processing interrupts when the clock interrupt happened".

Fix fallout from alpha/interrupt.c rev 1.93:

http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/alpha/alpha/interrupt.c#rev1.93

by which interrupts *seem* to occupy 100% CPU time.

Now, we bump ci_intrdepth for clock interrupt. Therefore, if ci_intrdepth > 1
is observed in statclock(), CPU is actually occupied by interrupts.

Thanks jklos and thorpej for notice!

branches: 1.99.4;
Expose a bunch of CPU details, including implementation version and
architecture extensions, via sysctl:

hw.cpu0.model = 21264A-0 (EV67)
hw.cpu0.major = 11
hw.cpu0.minor = 0
hw.cpu0.implver = 2
hw.cpu0.amask = 0x1307
hw.cpu0.bwx = 1
hw.cpu0.fix = 1
hw.cpu0.cix = 1
hw.cpu0.mvi = 1
hw.cpu0.pat = 1
hw.cpu0.pmi = 1
hw.cpu0.vax_fp = 1
hw.cpu0.ieee_fp = 1
hw.cpu0.primary_eligible = 1
hw.cpu0.primary = 1
hw.cpu0.cpu_id = 0
hw.cpu0.pcc_freq = 239990688

as well as some potentially interesting system-level variables:

machdep.cctr = 0
machdep.is_qemu = 1

Should address the basic concern in PR port-alpha/15835.

Improve time keeping and host CPU usage when running in Qemu:
- clockattach(): Allow multiple calls when running in Qemu. Anything
after this first one is ignored, but this gives us a change to use
a clock source provided by the VM directly, rather than relying on
a more expensive hardware emulation.
- Add cpu_initclocks_secondary(), to handle clock setup on secondary
CPUs, if needed.
- Allow us to use the WTINT PALcode call in cpu_idle() to idle in a lower
power state (Qemu's PALcode supports this).
- Use the Qemu per-cpu set-alarm-rel call as the hardclock interrupt
source. In Qemu environments, reduce hz to 50 (rather than the
default 1024) to give the clock a snowball's chance when running on
a host system with hz=100. XXX We have to manually re-calculate
tick and tickadj. There should be MI code to do this for us. Also
in Qemu environments, let hardclock() drive the sched clock by setting
schedhz=0.

Changes to make interrupt {,dis}establish MP-safe on Alpha:
- Protect all of the system interrupt linkage with the cpu_lock mutex.
- Re-order some of the stores to the SCB vector table to make it safe
in the face of lockless interrupt dispatch.
- Add a framework for routing interrupts to specific CPUs. Interrupts
are still funneled only to the primary CPU, but that will change for
some systems soon. Ensure that interrupt handler lists are manipulated
only on the CPUs that handle that specific interrupt source. This required
a re-factor of the alpha_shared_intr_*() family of functions.
- Enable __HAVE_INTR_CONTROL, although interrupt redistribution is still
a no-op.
- Reduce code duplication in the Jenson direct-SCB interrupt handlers.

Implement fast soft interrupts for Alpha. It's not yet enabled, because
there is a bug lurking that causes problems when user space starts up,
so we'll stick with the slow path for now.

Track the SSIR per-cpu, rather than globally.

Put the MI cpu_data at the beginning of cpu_info so that it is
cache line aligned.

Use SysValue to store curlwp rather than curcpu. curlwp is acceessed
much more frequently, and this makes curlwp preemption-safe.

Shuffle fields in cpu_info for better cache behavior.
XXX More changes to come after curlwp is overhauled.

Garbage-collect fpcurlwp -- it has been obsolete since FPU tracking
was converted over to PCU.

Garabage-collect curpcb / cpu_info::ci_curpcb.

- Centralize per-CPU pmap initialization into a new pmap_init_cpu()
function. Call in from pmap_bootstrap() for the boot CPU, and
from cpu_hatch() for secondaary CPUs.
- Eliminiate the dedicated I-stream memory barrier IPI; handle it all from
the TLB shootdown IPI. Const poison, and add some additional memory
barriers and a TBIA to the PAUSE IPI.
- Completly rewrite TLB management in the alpha pmap module, borrowing
somoe ideas from the x86 pmap and adapting them to the alpha environment.
See the comments for theory of operation. Add a bunch of stats that
can be reported (disabled by default).
- Add some additional symbol decorations to improve cache behavior on
MP systems. Ensure coherency unit alignment for several structures
in the pmap module. Use hashed locks for pmap structures.
- Start out all new processes on the kernel page tables until their
first trip though pmap_activate() to avoid the potential of polluting
the current ASN in TLB with cross-process mappings.

- cpu_need_resched(): Explicitly cover each RESCHED_* case, and add a
comment explaining why we don't need to act on IDLE+REMOTE.
- cpu_signotify(): Move to machdep.c, and if we're asked to notify
an LWP running on another CPU, send an AST IPI to that CPU. Add some
assertions.
- cpu_need_proftick(): Move to machdep.c, add some assertions.

- Track the currently-activated pmap in struct cpu_info.
- Reserve some space in struct cpu_info for future pmap changes.

Fix false sharing problems with cpu_info. Identified with tprof(8).
This was a very nice win in my tests on a 48 CPU box.

- Reorganise cpu_data slightly according to usage.
- Put cpu_onproc into struct cpu_info alongside ci_curlwp (now is ci_onproc).
- On x86, put some items in their own cache lines according to usage, like
the IPI bitmask and ci_want_resched.

Make ci_want_resched a u_int.

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.83.14; 1.83.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.82.6; 1.82.10;
undo rump workaround

rumpkernel needs ci_pcc_freq

use __unused instead of __USE and void cast to mark iterator variable unused
where needed (from phone)

use __USE() in the iterator variable

branches: 1.78.6; 1.78.10;
cpu_uarea_free returns bool, not void

branches: 1.77.2; 1.77.6;
Add latent support for __HAVE_CPU_UAREA_ROUTINES

branches: 1.76.2;
Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.75.2; 1.75.4;
Since struct cpu_data isn't the first member in struct cpu_info, instead
expose the initial portion of struct cpu_info if _KMEMUSER is defined.

branches: 1.74.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.73.2; 1.73.4;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.72.12; 1.72.16;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.71.6;
Add MI todr(9) support and timercounter(9) support with kern_cctr.c to alpha:
- use todr(9) API with MI mc146818(4) driver and remove homegrown
todr stuff from MD alpha/clock.c and alpha/mcclock.c
- also remove obsolete cc_microtime stuff from MD code
- add ci_pcc_freq member in struct cpu_info for cpu_frequency(), and
calibrate it with mc146818 interval clock in mcclock attachment
- call cc_init() in cpu_initclocks(9) because all alpha cpus have
a pcc counter

Tested on DEC 3000/300 and AlphaPC 164, but not on any SMP machines yet.

branches: 1.70.2; 1.70.4;
Fix multiprocessor operation: move a couple of fields in struct cpu_info
to the beginning so they can still be accessed in assymbly code using 8 bit
offsets. The addition of a big structure in cpu_data moved these outside
the range of the addq instruction. Gas should have complained that the
immediate value was too large, but just silently truncated it. I can now
run multiprocessor again.

Fix alpha MP for idlelwp: ci_idle_lwp was added to cpu_info
structure, but never initialized. There's already a cpu_idlelwp
in ci_data, which appears to be the same thing, so use that instead.

merge yamt-idlelwp branch. asked by core@. some ports still needs work.

from doc/BRANCHES:

idle lwp, and some changes depending on it.

1. separate context switching and thread scheduling.
(cf. gmcgarry_ctxsw)
2. implement idle lwp.
3. clean up related MD/MI interfaces.
4. make scheduler(s) modular.

branches: 1.67.2; 1.67.6; 1.67.8; 1.67.12; 1.67.14;
Remove spllowersoftclock() and CLKF_BASEPRI(), and always dispatch callouts
via a soft interrupt. In the near future, softclock will be run from process
context.

Merge newlock2 to head.

branches: 1.65.20;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

merge ktrace-lwp.

branches: 1.63.12;
move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.60.2;
Share alpha/microtime.c with i386 and sparc64 as kern_microtime.c.
(approved by martin)

Merge the nathanw_sa branch.

branches: 1.58.4;
use _KERNEL_OPT

Assorted microtime fixes (similar to fixes I made yesterday when
porting this code to i386mp branch):

- call microset() early on each cpu so that calls to microtime()
before the first clock interrupt don't return trash. this manifested
itself as garbage runtimes in "ps" for kernel threads.
- avoid races between hardclock updating "time" and microset on a
different cpu reading it by adding a "microset_time" global which is
initialized from "time" on the primary cpu.
- call microset every hz ticks, not every hz+1 (cosmetic)

Add a microtime() implementation that interpolates between ticks
using the cycle counter. MP-safeness is achieved by giving each
CPU its own PCC frequency variables, and kicking the non-primary
processors via an IPI once per second.

Based on the sample code from David Mills' "A Kernel Model for
Precision Timekeeping".

o IEEE 754 floating-point completion code.
o Implement the architected FP_C "Floating Point Control Quadword"

Adjust the way the cpu_info[] array works (array of pointers
rather than array of structures). Keep a list of active
CPUs and define a CPU_INFO_FOREACH to traverse them.

This fixes cpustates statistics tracking.

Eliminate race conditions in the FP-switch code. MP kernels get
much further on the way to multi-user now.

branches: 1.52.2;
revert previous commit while the longbeards ponder

Remove cpu_wait #define because it's now prototyped in <sys/proc.h> which
means it has to really exist.

Make ASTs per-process.

Oops; add PROC_PC().

Several changes, which get us generally further along with
multiprocessor support:
- Implement MP-safe halt.
- Make the FPU saving code more like Bill's on the i386 MP branch.
XXX This code will no doubt be revisited again.
- Pass the cpu_info and trapframe to IPI handlers, saving some work
in the handlers themselves, and also making it possible for the
"pause" handler to reference register state for DDB.
- Add "machine cpu" to DDB, making it possible to reference other
CPUs registers (and thus get e.g. a traceback) from whichever
CPU is actually running the debugger.
- Garbage-collect "machine halt" and "machine reboot" DDB commands.
They don't have a prayer of working properly in multiprocessor
kernels, and didn't really work all that well in uniprocessor kernels.

Make ci_ipis volatile.

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

Add experimental code for pausing other CPUs upon a CPU's
entry into the debugger. While I'm here, add splsched()
as per spl(9).

And more ANSI'ification!

Switch to the new `evcnt' mechanism for counting interrupts. Maintain
a per-CPU interrupt counter for clock, device, and interprocessor
interrupts.

Increment an interrupt depth counter in non-clock interrupt cases
so that we can get time spent in interrupt statistics.

- Clean up clock interrupt code a bit, and provide a CPU_IS_PRIMARY()
macro in the MULTIPROCESSOR case (hardclock() wants it).
- Implement __GENERIC_SOFT_INTERRUPTS, and redefine the legacy
software interrupts in terms of it. Garbage-collect setsoftserial().

- In the MULTIPROCESSOR case, initialize p_cpu before a process is
marked SONPROC.
- Always make curproc, fpcurproc, astpending, and want_resched per-CPU
variables in struct cpu_info. Restructure code accordingly, and trim
a few instructions from a few spots in various places in locore.

branches: 1.39.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

Print any architecture extensions present on the primary CPU.

Put machine check info in cpu_info in the multiprocessor case, and
just have one statically allocate machine check info structure in the
single processor config case.

- Remove a misguided attempt to use procs as idle contexts for secondary
processors. Instead, allocate separate idle PCBs for them (including
the primary -- don't use proc0's for its idle context).
- Use SysValue to store the cpu_info for each processor.

branches: 1.35.2; 1.35.8;
Centralize the declaration and clearing of `cold'.

Pull in <machine/alpha_cpu.h>.

Protect userland from the vast majority of this file.

Move cpu_info and related info into <machine/cpu.h>, and implement the
other MP API components discussed on tech-smp.

Define cpu_number() as discussed on tech-smp.

Rip out 70 lines of (all of) the port-alpha-specific decls and prototypes.
They should not be visible to the MI kernel and the MI kernel shouldn't
depend on this junk. Most of it moves to new module <machine/alpha.h>.

Leave badaddr() here, though, because it's used so widely.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Prototype cpu_halt_secondary().

First-cut at code to spin up secondary processors on a multiprocessor
Alpha system, conditional on MULTIPROCESSOR.

NOTE: This does not yet work completely. The secondary CPU begins the
boot process, but never makes it into the cpu spinup trampoline. This
is merely a snapshot of a work-in-progress.

Kill the old extern mchkinfo pointer and prototype cpu_mchkinfo().
This file has been collecting prototypes and other things used in the MD
code...that's bad...because this is exported to the MI kernel.

stale beer- place structure in right file

Add machine check type definitions. Structure the expected/received
machine check items.

Add support for non-contiguous physical memory, using MACHINE_NEW_NONCONTIG.
These changes also recover memory that is located before the kernel in
the first system software segment on systems which do not use the PROM
for console I/O. Written by Chris Demetriou and myself.

Clean up kernel initialization. Use the bootinfo structure (or innate
knowledge) earlier, and gather all information needed earlier. Mark the
init code carefully re: when it can print stuff out, when it can expect
the firmware to stop working, etc. Be more careful about using the PROM
console and other PROM facilities, and hint that in the future all use
of firmware/boot program callbacks by the kernel should go away (since
the world may not be mapped the way the firmware/boot program wants!).

clean up the way bootinfo information is passed and used: move the version
number passed by the boot block into a register, change the kernel's
bootinfo handing so that it always uses bootinfo to get bootinfo-ish values
(filling them in if the boot blocks didn't pass them), and make versioning
a small bit more sane.

Redo the platform specific identification and initialization, making
it more explicit where platform specific functions (like machine check
handling) should go.

branches: 1.17.2;
Update alpha_init() prototype; takes two more args.

clean up NetBSD RCS ID strings

astpending and want_resched are kernel-only

add a "machdep.booted_kernel" sysctl, which is the name of the booted
kernel as supplied by the SRM console's BOOTED_FILE variable.

branches: 1.13.2;
compile cleanly with:
-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual

(1) Add unaligned access fixup code to fix unaligned quad, long,
and IEEE S and T floating datum loads and stores. VAX floating data
types not yet supported, and in the future will only be supported if
FIX_UNALIGNED_VAX_FP is defined. (No point in wasting the space when
most of the time there will never be VAX FP loads and stores.) Right
now, these features can be controlled only by sysctl. The (boolean)
integer sysctls machdep.unaligned_print, machdep.unaligned_fix, and
machdep.unaligned_sigbus control printing about unaligned accesses
(defaults on), fixing up of unaligned accesses (defaults on), and
forcing a SIGBUS on unaligned accesses (defaults off). If an access
is not fixed up (for lack of method or explicit decision), a SIGBUS is
always generated to keep programs from using bogus data. At some point,
these three choices should be controlled by per-process flags, as well.

Instead of treating the trap/syscall/exception frame like a struct
containing a substruct (the hardware frame) and an array of registers,
treat it like one big array of registers, for easier and prettier
access. Update everything to deal with that.

update to use new definitions in alpha_cpu.h

various cleanup, move setsoft* and spl* into intr.h.

add a new machine-dependent sysctl, machdep.root_device, which is the
(string) name of the root device. It's a string so that it can
be used before dev_mkdb has been run.

branches: 1.7.4;
Remove deprecated cpu_setstack().

remove unused cpu_exec() definitions. moved "broken swap" markers, for
ports that still need it, to types.h.

update for various (old) NetBSD changes

define BROKEN_SWAP and/or cpu_swapout as appropriate.

- added sunos_machdep.c for sun3, atari, amiga and mac68k.
- changed machdep.c and trap.c to use struct emul.
- remove ep_setup references.
- added struct emul to all emulations.

remove support for double-mapping the user area/kernel stack

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

Fix cycle counter-based time keeping on Alpha in MP environments by using
a simpler calibration algorithm for the CC timecounter. Proposed in 2018
by Naruaki Etomi:

https://mail-index.netbsd.org/tech-kern/2018/01/14/msg022940.html

This patch is largely based on the proposed change, but avoids changing
any other timecounter logic, and re-factors things a bit to keep them
as MI as possible.

Remove clause 3 and 4 from TNF licenses

branches: 1.5.16; 1.5.18; 1.5.20;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.4.6;
Add MI todr(9) support and timercounter(9) support with kern_cctr.c to alpha:
- use todr(9) API with MI mc146818(4) driver and remove homegrown
todr stuff from MD alpha/clock.c and alpha/mcclock.c
- also remove obsolete cc_microtime stuff from MD code
- add ci_pcc_freq member in struct cpu_info for cpu_frequency(), and
calibrate it with mc146818 interval clock in mcclock attachment
- call cc_init() in cpu_initclocks(9) because all alpha cpus have
a pcc counter

Tested on DEC 3000/300 and AlphaPC 164, but not on any SMP machines yet.

branches: 1.3.24; 1.3.32; 1.3.36; 1.3.38;
Change "inline" back to "__inline" in .h files -- C99 is still too
new, and some apps compile things in C89 mode. C89 keywords stay.

As per core@.

branches: 1.2.2; 1.2.4; 1.2.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

branches: 1.1.18;
Share alpha/microtime.c with i386 and sparc64 as kern_microtime.c.
(approved by martin)

Add a mechanism to allow a platform to optionally shelter some region
of physical memory from random allocations from the default VM page
free list. Use this hook to shelter regions within 0-16MB of physical
RAM on Jensen and Irongate systems; those platforms do not have SGMAP
DMA, and so we need to shelter this range so that devices using ISA DMA
(e.g. floppy controller) have an opportunity to allocate DMA-safe memory.

PR port-alpha/27087

Remove a no-longer-accurate comment.

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.14.2; 1.14.6;
struct device * -> device_t

branches: 1.13.2; 1.13.160;
Rework the interrupt code, shaving some cycles off in the process.
Rather than an "iointr" routine that decomposes a vector into an
IRQ, we maintain a vector table directly, hooking up each "iointr"
routine at the correct vector. This also allows us to hook device
interrupts up to specific vectors (c.f. Jensen).

We can shave even more cycles off, here, and I will, but it requires
some changes to the alpha_shared_intr stuff.

branches: 1.12.6;
And more ANSI'ification!

- Clean up clock interrupt code a bit, and provide a CPU_IS_PRIMARY()
macro in the MULTIPROCESSOR case (hardclock() wants it).
- Implement __GENERIC_SOFT_INTERRUPTS, and redefine the legacy
software interrupts in terms of it. Garbage-collect setsoftserial().

Rearrange things a little so we can deal with systypes that aren't
densely packed.

branches: 1.9.2;
Don't declare a variable in the 'struct platform' declaration - we declare
an extern for 'struct platform platform' further down this file anyway,
and this would have declared a 'platform' variable in any userland code
including this file.

branches: 1.8.14;
Clean up a little, and add a `powerdown' hook in the platform structure.

Clean up the messages displayed when either platform support is not
configured into the kernel, or when the platform is not supported.
Use the defopt'ed options, rather than NDEC_... and remove the needs-flag
hack that's existed for a while.

branches: 1.6.2;
Redo the platform specific identification and initialization, making
it more explicit where platform specific functions (like machine check
handling) should go.

branches: 1.5.2;
Oops, wrap cpu_decl()s inside #ifdef _KERNEL/#endif.

Clean this up a bit; defopt has rendered the #undef hacks unnecessary.
Also, put the cpu_decl()s in cpuconf.h, so that platform support files
can pull in the prototypes from there, and pull in options for those
systems for which there is code in the source tree.

Ressurect from the Attic.

reorganize cpu configuration and device configuration tables. Now all macro
definitions and prototypes are in machine/conf.h, and all tables are in
alpha/conf.c.

branches: 1.1.2;
convert cpu-dependent routine selection to use a centralized CPU switch, thus
deleting (and cleaning up) N pages of #ifdefs in machdep.c. While we're
at it, make the cpu type options generate flags, and check them instead of
kernel Makefile defines.

Expose a bunch of CPU details, including implementation version and
architecture extensions, via sysctl:

hw.cpu0.model = 21264A-0 (EV67)
hw.cpu0.major = 11
hw.cpu0.minor = 0
hw.cpu0.implver = 2
hw.cpu0.amask = 0x1307
hw.cpu0.bwx = 1
hw.cpu0.fix = 1
hw.cpu0.cix = 1
hw.cpu0.mvi = 1
hw.cpu0.pat = 1
hw.cpu0.pmi = 1
hw.cpu0.vax_fp = 1
hw.cpu0.ieee_fp = 1
hw.cpu0.primary_eligible = 1
hw.cpu0.primary = 1
hw.cpu0.cpu_id = 0
hw.cpu0.pcc_freq = 239990688

as well as some potentially interesting system-level variables:

machdep.cctr = 0
machdep.is_qemu = 1

Should address the basic concern in PR port-alpha/15835.

Major cleanup of alpha device drivers.
Switch to CFATTACH_DECL_NEW.
struct device * -> device_t
struct cfdata * -> cfdata_t
Use of device_xname. No direct access to struct device members.
Use aprint* (not complete).

branches: 1.4.32;
Remove clause 3 and 4 from TNF licenses

branches: 1.3.104; 1.3.106; 1.3.108;
Make sure to include opt_foo.h if a defflag option FOO is used.

branches: 1.2.2;
Count individual interprocessor interrupts -- it's good to know where
they all come from.

branches: 1.1.4;
Switch to the new `evcnt' mechanism for counting interrupts. Maintain
a per-CPU interrupt counter for clock, device, and interprocessor
interrupts.

Changes to let the Alpha DDB code build in user-space for crash(8).

Adjust proc/lwp access for user-space (crash(8)).

Refactor the special symbol handling out of db_trace.c into
db_interface.c, and abstract it away from having to read kernel
symbols directly.

ddb: New db_stack_trace_print_ra.

Takes an optional extra argument for the return address so that the
stack parser has a chance to use instruction-dependent interpretation
of the frame to find parent frames.

Implemented only on Alpha for now, which needs it. Other
architectures just ignore the extra argument.

PR port-alpha/57716

XXX pullup-10
XXX pullup-9
XXX pullup-8

Cleanup and clarify the ELFSIZE mess:

We now have 2 variables automatically set in elf_machdep.h:

ARCH_ELFSIZE: the size for userland binaries
KERN_ELFSIZE: the size for the kernel binaries

DB_ELFSIZE has been deleted and KERN_ELFSIZE should have always the
same values DB_ELFSIZE used to have.

In sys/exec_elf.h, if ELFSIZE is not set, it is set to KERN_ELFSIZE
for the kernel and ARCH_ELFSIZE for userland. These defaults should
eliminate the need for most manual ELFSIZE setting.

branches: 1.18.14;
Introduce DDB_EXPR_FMT and replace the logic around DB_EXPR_T_IS_QUAD.

branches: 1.17.68; 1.17.74;
Replace the Mach-derived boolean_t type with the C99 bool type. A
future commit will replace use of TRUE and FALSE with true and false.

branches: 1.16.14;
remove a typecast in a macro which is used on the LHS. gcc4 doesn't like it

closes: PR kern/32359

modifies machine/db_machdep.h: BKPT_SET(inst) to BKPT_SET(inst, addr) for all archs ie; passess the
breakpoint address as well.

Patch from cherry@mahiti.org

branches: 1.14.18; 1.14.32; 1.14.34; 1.14.36; 1.14.38; 1.14.40;
Add a BKPT_ADDR() macro which gives MD code a chance to munge a
breakpoint address before it's used. Currently a no-op on all but sh5.

This is useful on sh5, for example, to mask off the instruction
type encoding in the bottom two address bits, and makes it possible
to do "db> break $rXX" instead of manually munging the address.

branches: 1.13.4;
Glue in KGDB. Needs some more work -- KGDB currently renders
DDB disabled, but it's a start.

branches: 1.12.2;
Just access the trapframe directly for DDB registers.

remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

ANSI'ify.

branches: 1.9.2; 1.9.10;
After reviewing the Green Book, BPT traps do indeed leave the PC pointing
to the instruction _after_ the `call_pal bpt' instruction.

Prototype alpha_debug(), and add some definitions for KGDB.

branches: 1.7.8;
vm_offset_t -> {paddr_t,vaddr_t}, vm_size_t -> vsize_t

Prototype db_register_value().

branches: 1.5.2;
More DDB support:
- Add support for software single-stepping (Alpha does not have hardware
support for single-stepping)
- Alpha uses Elf64 symbols.

clean up NetBSD RCS ID strings

FIXUP_PC_AFTER_BREAK now takes an arg of type db_regs_t *

branches: 1.2.2;
Instead of treating the trap/syscall/exception frame like a struct
containing a substruct (the hardware frame) and an array of registers,
treat it like one big array of registers, for easier and prettier
access. Update everything to deal with that.

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

Add getlabelusesmbr(), as proposed in
http://mail-index.netbsd.org/tech-userlevel/2011/08/25/msg005404.html
This is used by disk tools such as disklabel(8) to dynamically decide is
the undelyling platform uses a disklabel-in-mbr-partition or not
(instead of using a compile-time list of ports).
getlabelusesmbr() reads the sysctl kern.labelusesmbr, takes its value from the
machdep #define LABELUSESMBR.
For evbmips, make LABELUSESMBR 1 if the platform uses pmon
as bootloader, and 0 (the previous value) otherwise.

If cpu_disklabel includes struct dkbad, define __HAVE_DISKLABEL_DKBAD.
This allows use of subr_disk_mbr on all archs. Default to it for
the rump disk component. No functional change for regular kernels.
(The other option would've been to include dkbad in disklabels
everywhere, but arguably this approach has less possible side-effects,
especially given that wedges and related magic will take over the
world any second now).

branches: 1.9.78;
merge ktrace-lwp.

Make disklabel(8) and fdisk(8) into "host tools " last step: build
and install ${TOOLDIR}/bin/${MACHINE_GNU_PLATFORM}-disklabel,
${TOOLDIR}/bin/${MACHINE_GNU_PLATFORM}-fdisk by "reaching over" to
the sources in ${NETBSDSRCDIR}/sbin/{disklabel fdisk}/.

To avoid clashes with a build-host's header files, especially on
*BSD, the host-tools versions of fdisk and disklabel search for
#includes such as disklabel.h, disklabel_acorn.h, disklabel_gpt.h,
and bootinfo.h in a new #includes namespace, nbinclude/. That is,
they #include <nbinclude/sys/disklabel.h>, <nbinclude/machine/disklabel.h>,
<nbinclude/sparc64/disklabel.h>, instead of <sys/disklabel.h> and
such. I have also updated the system headers to #include from
nbinclude/-space when HAVE_NBTOOL_CONFIG_H is #defined.

branches: 1.7.10;
remove boot_block stuff from include/disklabel.h, and migrate to
alpha_boot_block stuff in dev/dec/dec_boot.h

branches: 1.6.6; 1.6.8;
Fix doubled 'the's in comments.

branches: 1.5.2; 1.5.8;
clean up slightly, do a little #define trick to make checksumming
the boot block a little easier/more 'clean', and provide a macro to
checksum the boot block.

define 'struct boot_block' which is the alpha (SRM) boot block

clean up NetBSD RCS ID strings

add bad sector information to cpu disklabel

branches: 1.1.4;
preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.

rename <machine/ecoff.h> to <machine/ecoff_machdep.h> for clarity and
consistency with the way machdep headers for other things are done.
(the creation of the ecoff_machdep.h files was done on the CVS server, to
keep the RCS logs intact.)

change structure member names to be in line with what various ECOFF
documentation I have calls them, and update for new definitions in
sys/exec_ecoff.h. Also, fix ECOFF_SEGMENT_ALIGNMENT macro so that it
actually returns the right alignment.

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

preliminary Alpha support. note that NOT ALL OF THE MODIFICATIONS TO
THE REST OF THE KERNEL ARE IN THE TREE YET. Also, some of this is
_incredibly_ hack-ish, etc., but it works.