[OpenBIOS] Solaris anyone? Solaris 9 04/04

[Blue Swirl]

On Fri, Sep 9, 2011 at 2:16 AM, Nathan Kunkee <nkunkee42 at hotmail.com> wrote:
>
>  On 06/15/11 01:48 PM, Blue Swirl wrote:
>>
>> [...snip...]
>> Shouldn't be very difficult. Since on Sparc32 it's not possible to
>> give ASI in a register, a switch or hand assembly would be needed.
>>
> I've had occasion to rebuild both openbios and QEMU-0.15 on my new machine
> :-), and can now follow up on this: the additions for the MMU breakpoint
> action register that Bob talked about have not made a difference for where
> my boot stalls. For an added bonus, I turned on the DEBUG_ASI in QEMU and so
> have more information about where it is looping. When I try and boot now, I
> get the following in an infinite loop:
>
> ASI: read  00000400 asi 0x04 = f5901000
> ASI: read  00000300 asi 0x04 = 000003a6
> ASI: read  f5901400 asi 0x03 = 00000000
> ASI: read  00000300 asi 0x04 = 00000000
> ASI: read  00000400 asi 0x04 = f5901000
> ASI: read  00000300 asi 0x04 = 000003a6
> ASI: read  f5901400 asi 0x03 = 00000000
> ASI: read  00000300 asi 0x04 = 00000000
> ASI: read  00000400 asi 0x04 = f5901000

The OS reads MMU fault status and address registers and then performs
MMU probe for the address. The address is not found, so maybe a
mapping is missing.

> I don't know enough about SPARC32 architecture to know if that gives more
> useful information... I don't see the 0x4c value in my log file. I tried
> turning on DEBUG_MMU, but stopped when my log file hit 4GB and I hadn't hit
> the stopping point yet.
>
> Any ideas for other things to try or set for more debugging?

Since this is repeatable, you could try something like this (untested):
diff --git a/target-sparc/op_helper.c b/target-sparc/op_helper.c
index d1a8dd9..2594bbd 100644
--- a/target-sparc/op_helper.c
+++ b/target-sparc/op_helper.c
@@ -1836,6 +1836,11 @@ uint64_t helper_ld_asi(target_ulong addr, int
asi, int size, int sign)
                 ret = mmu_probe(env, addr, mmulev);
             DPRINTF_MMU("mmu_probe: 0x%08x (lev %d) -> 0x%08" PRIx64 "\n",
                         addr, mmulev, ret);
+            if (addr == 0xf5901400) {
+                printf("mmu_probe: 0x%08x (lev %d) -> 0x%08" PRIx64 "\n",
+                        addr, mmulev, ret);
+                dump_mmu(stdout, fprintf, env);
+            }
         }
         break;
     case 4: /* read MMU regs */