TODO revision 1.42 
1/* $NetBSD: TODO,v 1.42 2021/06/13 17:02:14 palle Exp $ */
2
3Things to be done:
4
5common:
6- make %g6 point to curcpu
7- make %g7 point to curlwp
8- change run-time checks for cpu type to function pointers
9
10sun4u:
11- GENERIC.UP kernel hangs on v445 (missing interrupt?)
12
13sun4v:
14 - current status
15     T5 ldom with 2 VCPU and 4GB:
16       - kernel boots from miniroot.fs via ldom fisk (vdsk)
17	   - ldom virtual network interface (vnet) is working
18	     (verified by exiting sysinst and issuing a ping command)
19	   - the sysinst tool starts, disk setup is working,
20	     but the process crashes when selecting network installation method.
21		 The %i,%l and %o registers are corrupted, after a call to the libcurses
22		 wrefresh() function.
23		 If the sysinst insallation source is local directory, an error in the
24		 ldsk device driver is triggered when a DATA/NACK/DRING_DATA event is received.
25		 The current implementation does not hande this exception properly.
26	 T2000 ldom with 8 VCPU and 4GB:
27	   - crashes in /sbin/init doing an access() call where %o0 is corrupted (zero)
28	 S7 ldom with 8 VCPU and 16GB (primary ldom is Solaris 11.4 SRU30):
29	   - during autoconfiguration of vnet devices the call to hv_vintr_setenabled()
30	     returns error code 7 (EBADTRAP?)
31- 64-bit kernel support
32- 32-bit kernel support
33- libkvm
34- ofwboot: tlb_init_sun4v() hardcodes number of slots to 64
35- locore.s: sun4v_datatrap missing implementation for trap level 1
36- check build without SUN4V defined
37- replace relevant references to %ver with GET_MAXCWP
38- pmap_mp_init(): sun4v missing handling
39- replace constructs like "wrpr %g0, PSTATE_KERN, %pstate" with NORMAL_GLOBALS
40- replace constructs line "wrpr %g0, PSTATE_INTR, %pstate" with ALTERNATE_GOBALS
41- sun4v tsb no need to lock... per cpu... anyway...
42- ci_tsb_desc->td_ctxidx: -1 or 1?
43- MP support - currently bypassed in pmap_bootstrap() for sun4v
44- vpci.c/vpcivar.h: cleanup FIXMEs
45- interrupts not handled properly (com at ebus only...)
46- mpt(4) complains: mpt0: Phy 0: Link Status Unknown
47- man pages for drivers imported from OpenBSD lke vpci, vbus, cbus, vdsk, ldc etc.
48- vdsk and ldc drivers: code maked with OPENBSD_BUSDMA - make the bus_dma stuff work properly
49- vbus.c: handle prom_getprop() memory leaks
50- locore.s: rft_user (sun4v specific manaul fill) - seems to work, but is it good enough (compared to openbsds rft_user?
51- openfirmware interface
52    bounce handlng could need rework
53      - only #if __arch64__ independent for SUN4V, as OF for all ultrasparcs is
54        plain 32bit code too (and this #if only because the point below becomes
55        always false otherwise)
56      - only bounce if the address is >= 1UL<<32
57      - perhaps apply the lock to OF calls in general, not only the bounce'd ones
58        (in other words: let's protect the OF context with the lock, not
59        only the bounce buffer contents).
60	  - Are there any other bounce-worthy OF calls? If so, apply handling 
61	    to all of them now
62      - consider method used by Solaris/OpenSolaris/Illumos (look for PROM_32BIT_ADDRS in
63	    the Illumos codebase)
64 - platforms tested so far:
65 -- qemu sun4v/niagara - reaches the point where the kernel needs to mount a root fs
66 -- T2000 - mmu fault somewhere
67 -- T5 - stickcmpr is not properly initialized ???
68