Add gptmbr from syslinux 4.04, with some local modifications to fit our mbr
build system and to be self contanined.

Also, unlink the old mbr_gpt from the build.

Support booting from GPT-partioned disks on PC-BIOS-compatible systems.

Much of the work in this commit was done by Mike Volokhov during GSoC 2009.

branches: 1.2.24; 1.2.32;
Add two new versions of the mbr code that directly access a serial port.
'mbr_com0' assumes the BIOS has initialised the baud rate (etc)
'mbr_com0_9600' initialises the rate to 9600
Both have the functionality from 'mbr_ext' (ie they can boot from an
extended partition).
As compiled, the io_address for the serial port is taken from BIOS data.
(this should keep tls@ happy!)

branches: 1.1.18; 1.1.80; 1.1.86; 1.1.94;
Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)

i386: stand: G/C `mbr_gpt*`; unhooked since 2011 in prefer of `gptmbr`

Specify NOLIBCSANITIZER in x86 bootloader-like code under sys/arch/

Set NOLIBCSANITIZER for i386 and amd64 specific bootloader-like code.

branches: 1.20.2;
Set NOSANITIZER in i386 mbr files

This is required to build these files and keep then functional with
enabled MKSANITIZER.

Sponsored by <The NetBSD Foundation>

branches: 1.19.28;
Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

XXX: probabry we should have bsd.saprog.mk or something.

branches: 1.18.4; 1.18.14; 1.18.18;
mbr.S and gpt.S want to reassign ., so don't use the integrated
assembler for now.

branches: 1.17.4; 1.17.6;
Change relay address for mbr and bootxx code to be 0x8800.
I'm not sure why I used 0x600, but I have a feeling that might
sometimes corrupt bios data.
0x8800 is far enough above 0x7e00 for a sector read to the latter address.

Remove extra trailing slash in ${S} path.

Prefer MACHINE_ARCH to MACHINE in some tests

branches: 1.14.2; 1.14.8;
Use ${TOOL_SED} instead if plain sed in Makefiles.

disable PIE for boot code.

branches: 1.12.58; 1.12.62; 1.12.68;
support MAKEVERBOSE

whitespace cleanup.

Use BUILDSYMLINKS & DPSRCS to simplify the creation of includedir symlinks.

Use -Wl,-Ttext,foo instead of -Ttext foo when using $(CC)

branches: 1.8.4;
Convert to using CC instead of LD, as LDFLAGS is for CC not LD.

branches: 1.7.4; 1.7.6; 1.7.8; 1.7.12;
merge ktrace-lwp.

branches: 1.6.2;
.BEGIN cannot have dependencies.

Force STRIPFLAG to be empty after bsd.own.mk is included, so that
any value set in /etc/mk.conf is overriden.

branches: 1.4.2;
Make this work without a populated destdir:
machine and x86 symlinks.
Include from right places.
Don't depend on LIBCRT0,etc.

Also for the bootxx programs, keep the ELF object during the build
process.

use nm(1) to output decimal values immediately, instead of relying on a
(non-working) sh(1) construct.

Reviewed by simonb & bjh21.

force nm addresses in hex and add 0x prefix before handing numerical
expression to the shell.

Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)

i386: stand: G/C `mbr_gpt*`; unhooked since 2011 in prefer of `gptmbr`

Fix some whitespace style issues.

Compact crc32 code by 12 bytes of text.

From dave0 in #NetBSD on Freenode circa December 2017.

Tested in a 32-bit userland harness to produce identical results as old
code for one set of inputs.

branches: 1.1.6; 1.1.8; 1.1.62;
Support booting from GPT-partioned disks on PC-BIOS-compatible systems.

Much of the work in this commit was done by Mike Volokhov during GSoC 2009.

Drop explicit loop prefix. GAS doesn't care and LLVM doesn't support it.
Drop the need for assembling with GAS. While LLVM is using a suboptimal
encoding of for hard-coded memory writes, it shouldn't affect
functionality. It just wastes three bytes with extra prefixes.

branches: 1.1.2;
Add gptmbr from syslinux 4.04, with some local modifications to fit our mbr
build system and to be self contanined.

Also, unlink the old mbr_gpt from the build.

fix various typos in comments.

Remove now-incorrect detail about the link address from comment.

branches: 1.22.4;
Move code for outputting directly to the serial port into message.S
Allows it to be enabled for other parts of the boot sequence.

Adjust the way references to the unrelocated addresses are done so
that the address doesn't have to be passed in.
Adjust #ifdef so that only one item is checked - at it is the one used.

branches: 1.20.4;
#undef ACTIVE (not ENTER) since that is the variable we defined just above.
Noted on port-i386 by Gao Ya'nan.

branches: 1.19.6; 1.19.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.18.6; 1.18.8; 1.18.10;
Load 'default keycode' into correct byte so that 'boot on timeout' works.
Fixes PR/37960.
While here save another byte.

Somehow this file won some extra tab characters, nuke them to align the code.

Add two new versions of the mbr code that directly access a serial port.
'mbr_com0' assumes the BIOS has initialised the baud rate (etc)
'mbr_com0_9600' initialises the rate to 9600
Both have the functionality from 'mbr_ext' (ie they can boot from an
extended partition).
As compiled, the io_address for the serial port is taken from BIOS data.
(this should keep tls@ happy!)

The test for the 0xaa55 at the end of an extended partition pbr has always
been incorrect (and checked the end of the mbr - which always suceeds).
Rather than fixing the text, just delete it (saving 8 bytes from mbr_ext).

branches: 1.14.14; 1.14.20; 1.14.26;
Save a byte from the mbr code (by using lret not ljmp).

branches: 1.13.26; 1.13.30; 1.13.32;
merge ktrace-lwp.

branches: 1.12.12;
Need %ah == 0 (not 0xff) in order to find the correct partition table entry
when simulating a key press in the non-interactive mbr code.
Fixes bug introduced in rev 1.10 - older versions worked because %ah
happened to be 0!
Fixes PR bin/26919

Save 2 more bytes (by adjusting the ERR_NO_LBA setup).
Use up all the space by adding a short banner message.
'Fn diskn' for bootsel and 'NetBSB MBR boot' for the non-bootsel code.

Remove the functionality added in rev 1.7.
With no menu items the mbr_bootsel code will wait for the timeout (default
10 seconds) and then boot the default device - usually the active partition.
Forcing the 'active' partition was wrong - jmmv has a system which needs
to boot from hd1 where hd0 has no mbr partition info.
I suspect the problem I though rev 1.7 fixed was actually caused by
disklabel copying sector zero of the disk to sector zero of the partition!
Gains another 9 bytes of free space, mbr_bootsel now has 20 free bytes.

I challenged mycroft to optimise this code - and he found a spare byte...

Change MAXDRV to 0x8f, to fix El Torito booting problems on some machines.
See PR 22647.

Make mbr_bootsel boot active partition if/when no menu items are output.
Stops users sitting in front of a system that is waiting for a keypress.
Just don't ask how I added more functionality AND got an extra 7 free bytes!

Put the 'mbr has bootselect table' marker into all versions of the mbr code.
Having the table in the 'standard' mbr allows fdisk to write in bootsel
menu items and only ask about updating the mbr code before exit.
Sysinst validates that the mbr code contains the bootselect table for
all the mbr code variants it reads - because it might want to write the table
and doesn't really want to make the validation dependant on what it is
going to do later.
Fixes install/25235, but sysinst needs some changes (like reporting the
failure to write the mbr) before the pr itself is closed.

branches: 1.5.2;
Move mbr_bootsel from offset 404 to offset 400 in struct mbr_sector to
leave 4 bytes for the Windows NT Drive Serial Number (DSN) at 440-443
(as mbr_sector.mbr_dsn).

Ensure that all the MBR & PBR code reserves space for mbr_sector.mbr_dsn.

Leave the bootsel magic number at 444-445 as mbr_sector.mbr_bootsel_magic
(instead of mbr_sector.mbr_bootsel.mbrbs_magic), but use 0xb5e1 (MBR_BS_MAGIC)
instead of 0xaa55 (MBR_MAGIC) to indicate that this change has occurred.

Rework MBR_BS_NEWMBR to mean "mbr_bootsel has moved to 400".

Modify fdisk(8) to automatically relocate the mbr_bootsel from 404 to 400
if mbr_bootsel_magic is the old value (0xaa55), and unset MBR_BS_NEWMBR
to flag that new mbr_bootsel code must be used if updating the MBR.


These changes fixes a problem where Windows 2000 or Windows XP would corrupt
the last 3 bytes + NUL of MBR partition 3's bootsel name if the bootsel name
was 5 characters long, replacing bytes 6-9 with the DSN.
Also, by explicitly reserving the space for the DSN we prevent problems in the
future if non bootsel MBR or PBR code had other information at bytes 440-443.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

Fix copyright - it got mangled earlier.
Added a mention of Wolfgang Solfrank - there are probably only comments left
from the much older mbr.S that he contributed.
(Wolfgang pointed out the mangled copyright, but doesn't object to the removal
of the Tools GmbH one.)

branches: 1.2.2;
Set BFL_NEWMBR flag so that fdisk can differenciate between new and old mbr code.

Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)

Drop explicit loop prefix. GAS doesn't care and LLVM doesn't support it.
Drop the need for assembling with GAS. While LLVM is using a suboptimal
encoding of for hard-coded memory writes, it shouldn't affect
functionality. It just wastes three bytes with extra prefixes.

Set LOADADDR to 0x600, matches how gptmbr.bin is compiled upstream.
This should let this actually work.

branches: 1.2.2;
.code16 user, so disable integrated assembler with clang for now.

Add gptmbr from syslinux 4.04, with some local modifications to fit our mbr
build system and to be self contanined.

Also, unlink the old mbr_gpt from the build.

Reinstate the banner.
This was added to detect problems when the mbr code gets written into the pbr.
(When the code loops reading the pbr!)
It is also a useful diagnosting that the boot it proceeding normally.

branches: 1.2.14;
Tidy up console output slightly.

branches: 1.1.104; 1.1.106; 1.1.108;
Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)

merge ktrace-lwp.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

branches: 1.1.2;
Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)

branches: 1.1.2; 1.1.4; 1.1.12;
Add two new versions of the mbr code that directly access a serial port.
'mbr_com0' assumes the BIOS has initialised the baud rate (etc)
'mbr_com0_9600' initialises the rate to 9600
Both have the functionality from 'mbr_ext' (ie they can boot from an
extended partition).
As compiled, the io_address for the serial port is taken from BIOS data.
(this should keep tls@ happy!)

branches: 1.1.2; 1.1.4; 1.1.12;
Add two new versions of the mbr code that directly access a serial port.
'mbr_com0' assumes the BIOS has initialised the baud rate (etc)
'mbr_com0_9600' initialises the rate to 9600
Both have the functionality from 'mbr_ext' (ie they can boot from an
extended partition).
As compiled, the io_address for the serial port is taken from BIOS data.
(this should keep tls@ happy!)

merge ktrace-lwp.

Overhaul MBR handling (part 1):

<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.

As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.

<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).

amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.

* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).

* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.

* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.

* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.

* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.

installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)

mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.


Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).

branches: 1.1.2;
Master Boot Record (mbr) code:
mbr: boots active partition
mbr_bootsel: menu selection for partitions 1 to 4
mbr_ext: menu selection for partitions 1 to 4 and extended partitions
Based on code from sbin/fdisk/mbr_bootsel.
Needs a new fdisk to configure mbr_ext and correctly set default menu selection.(Not yet built by defaulat)