TODO revision 1.45 
1/* $NetBSD: TODO,v 1.45 2021/09/23 17:51:52 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  (primary ldom is Solaris 11.4 SRU30)::
16       - kernel boots from miniroot.fs via ldom disk (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, network configuration is working,
20	     but after the selected (minimal) sets have been downloaded and installed
21		 the 'sh MAKEDEV all' comand hangs.
22	 T2000 ldom with 8 VCPU and 4GB:
23	   - crashes in /sbin/init doing an access() call where %o0 is corrupted (zero)
24	 S7 ldom with 8 VCPU and 16GB (primary ldom is Solaris 11.4 SRU33):
25	   - same status as T5 ldom
26- 64-bit kernel support
27- 32-bit kernel support
28- libkvm
29- ofwboot: tlb_init_sun4v() hardcodes number of slots to 64
30- locore.s: sun4v_datatrap missing implementation for trap level 1
31- check build without SUN4V defined
32- replace relevant references to %ver with GET_MAXCWP
33- pmap_mp_init(): sun4v missing handling
34- replace constructs like "wrpr %g0, PSTATE_KERN, %pstate" with NORMAL_GLOBALS
35- replace constructs line "wrpr %g0, PSTATE_INTR, %pstate" with ALTERNATE_GOBALS
36- sun4v tsb no need to lock... per cpu... anyway...
37- ci_tsb_desc->td_ctxidx: -1 or 1?
38- MP support - currently bypassed in pmap_bootstrap() for sun4v
39- vpci.c/vpcivar.h: cleanup FIXMEs
40- interrupts not handled properly (com at ebus only...)
41- mpt(4) complains: mpt0: Phy 0: Link Status Unknown
42- man pages for drivers imported from OpenBSD lke vpci, vbus, cbus, vdsk, ldc etc.
43- vdsk and ldc drivers: code maked with OPENBSD_BUSDMA - make the bus_dma stuff work properly
44- vbus.c: handle prom_getprop() memory leaks
45- locore.s: rft_user (sun4v specific manaul fill) - seems to work, but is it good enough (compared to openbsds rft_user?
46- openfirmware interface
47    bounce handlng could need rework
48      - only #if __arch64__ independent for SUN4V, as OF for all ultrasparcs is
49        plain 32bit code too (and this #if only because the point below becomes
50        always false otherwise)
51      - only bounce if the address is >= 1UL<<32
52      - perhaps apply the lock to OF calls in general, not only the bounce'd ones
53        (in other words: let's protect the OF context with the lock, not
54        only the bounce buffer contents).
55	  - Are there any other bounce-worthy OF calls? If so, apply handling 
56	    to all of them now
57      - consider method used by Solaris/OpenSolaris/Illumos (look for PROM_32BIT_ADDRS in
58	    the Illumos codebase)
59 - platforms tested so far:
60 -- qemu sun4v/niagara - reaches the point where the kernel needs to mount a root fs
61 -- T2000 - mmu fault somewhere
62 -- T5 - stickcmpr is not properly initialized ???
63