TODO revision 1.38 
1/* $NetBSD: TODO,v 1.38 2021/03/16 20:11:30 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 installtion method
21		 (probably due to trashing of user proces registers)
22	 T2000 ldom with 8 VCPU and 4GB:
23	   On this platform it crashes in /sbin/init doing an access() call where %o0 is corrupted (zero)
24- idle handling - call hypervisor trap (openbsd code...??)	   
25- 64-bit kernel support
26- 32-bit kernel support
27- libkvm
28- ofwboot: tlb_init_sun4v() hardcodes number of slots to 64
29- locore.s: sun4v_datatrap missing implementation for trap level 1
30- check build without SUN4V defined
31- replace relevant references to %ver with GET_MAXCWP
32- pmap_mp_init(): sun4v missing handling
33- replace constructs like "wrpr %g0, PSTATE_KERN, %pstate" with NORMAL_GLOBALS
34- replace constructs line "wrpr %g0, PSTATE_INTR, %pstate" with ALTERNATE_GOBALS
35- sun4v tsb no need to lock... per cpu... anyway...
36- ci_tsb_desc->td_ctxidx: -1 or 1?
37- MP support - currently bypassed in pmap_bootstrap() for sun4v
38- vpci.c/vpcivar.h: cleanup FIXMEs
39- interrupts not handled properly (com at ebus only...)
40- mpt(4) complains: mpt0: Phy 0: Link Status Unknown
41- man pages for drivers imported from OpenBSD lke vpci, vbus, cbus, vdsk, ldc etc.
42- vdsk and ldc drivers: code maked with OPENBSD_BUSDMA - make the bus_dma stuff work properly
43- vbus.c: handle prom_getprop() memory leaks
44- locore.s: rft_user (sun4v specific manaul fill) - seems to work, but is it good enough (compared to openbsds rft_user?
45- openfirmware interface
46    bounce handlng could need rework
47      - only #if __arch64__ independent for SUN4V, as OF for all ultrasparcs is
48        plain 32bit code too (and this #if only because the point below becomes
49        always false otherwise)
50      - only bounce if the address is >= 1UL<<32
51      - perhaps apply the lock to OF calls in general, not only the bounce'd ones
52        (in other words: let's protect the OF context with the lock, not
53        only the bounce buffer contents).
54	  - Are there any other bounce-worthy OF calls? If so, apply handling 
55	    to all of them now
56      - consider method used by Solaris/OpenSolaris/Illumos (look for PROM_32BIT_ADDRS in
57	    the Illumos codebase)
58 - platforms tested so far:
59 -- qemu sun4v/niagara - reaches the point where the kernel needs to mount a root fs
60 -- T2000 - mmu fault somewhere
61 -- T5 - stickcmpr is not properly initialized ???
62