[src/trunk]: src/sys/arch/sparc64/doc sun4v: update current status of sun4v

[palle <palle%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7dba71e8b61b
branches:  trunk
changeset: 959700:7dba71e8b61b
user:      palle <palle%NetBSD.org@localhost>
date:      Mon Feb 22 10:30:57 2021 +0000

description:
sun4v: update current status of sun4v

diffstat:

 sys/arch/sparc64/doc/TODO |  27 +++++++++------------------
 1 files changed, 9 insertions(+), 18 deletions(-)

diffs (41 lines):

diff -r 5c888c343fd1 -r 7dba71e8b61b sys/arch/sparc64/doc/TODO
--- a/sys/arch/sparc64/doc/TODO Mon Feb 22 09:56:42 2021 +0000
+++ b/sys/arch/sparc64/doc/TODO Mon Feb 22 10:30:57 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: TODO,v 1.33 2021/02/14 20:30:31 palle Exp $ */
+/* $NetBSD: TODO,v 1.34 2021/02/22 10:30:57 palle Exp $ */
 
 Things to be done:
 
@@ -11,23 +11,14 @@
 - GENERIC.UP kernel hangs on v445 (missing interrupt?)
 
 sun4v:
- - current status (verified on T5 ldom with 2 VCPU and 4GB):
-     The kernel boots and starts userland.
-        During the execution of the sysinst process, a sub-process crashes.
-        The crash happens when a call to sysctl from /bin/sh causes a mmu trap.
-        Part of the TRAP_SETUP() call in sun4v_datatrap issues a 'save' instruction.
-        Since %cansave is 0 (%canrestore is 6 and %otherwin is 0) a SPILL trap is generated.
-        The current code ends up in the pcbspill codepath (which is based on code from openbsd).
-        This code assumes that it is the register window in the OTHERWIN window that must be spilled
-        to the pcb.
-        Since %otherwin in this scenario actually is zero, we end up putting incorrect register
-        window values to the pcb.
-        So - this code should not save data to the pcb when %otherwin is 0 - it should spill the
-        values to the stack of the user process. Special care should be taken here, since we
-        may end up with a mmu fault again if the stack address is not present in the mmu, so
-        perhaps spilling to the physical address of the stack will work.
-        Time will show if this is correct...
-        Status on T2000 ldom with 8 VCPU and 4GB is that is crashes in /sbin/init doing an access() call where %o0 is corrupted (zero)
+ - current status
+     T5 ldom with 2 VCPU and 4GB:
+       The kernel boots and starts userland when booting miniroot.fs.
+       The sysinst tool starts properly and requests terminal type.
+          Upon entering characters on the console, a crash occurs inside
+          OpenBoot (properly trashed registers).
+        T2000 ldom with 8 VCPU and 4GB:
+          On this platform it crashes in /sbin/init doing an access() call where %o0 is corrupted (zero)
 - 64-bit kernel support
 - 32-bit kernel support
 - libkvm