Re: SMP support for sparc64

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

On Mar 13, 2008, at 13:03, Takeshi Nakayama wrote:

> > > > Takeshi Nakayama <tn%catvmics.ne.jp@localhost> wrote
>
> > Please test and review the attached patch.
>
> I just updated the patch, which fixes "RED State Exception" at
> shutdown and probably hang on SBus based machines.
>
> Pre-compiled kernel is also updated.
>
> >   ftp://ftp.netbsd.org/pub/NetBSD/misc/nakayama/netbsd-GENERIC.MP.gz
>
> I have changed assignment of timers in this update.  Previous patch
> uses %tick interrupt for system clock.  This patch uses
> counter-timer #0 as same as single processor kernel, but %tick is
> used for per-CPU statclock instead of counter-timer #1.

I tried your patch on an u60 - it went multiuser just fine but  
eventually ran into this panic:
data access exception
sparc_interrupt + 0x224
according to gdb that's in sparc_intr_retry
Dump of assembler code for function sparc_intr_retry:
0x00000000010092a4 <sparc_intr_retry+0>:        wr  %l3, 0, % 
clear_softint
0x00000000010092a8 <sparc_intr_retry+4>:        sethi  %hi 
(0xe0018000), %l4
0x00000000010092ac <sparc_intr_retry+8>:        sll  %l6, 3, %l2
0x00000000010092b0 <sparc_intr_retry+12>:       or  %l4, 0x68, %l4
0x00000000010092b4 <sparc_intr_retry+16>:       add  %l2, %l4, %l4
0x00000000010092b8 <sparc_intr_retry+20>:       membar  #StoreLoad
0x00000000010092bc <sparc_intr_retry+24>:       ldx  [ %l4 ], %l2
0x00000000010092c0 <sparc_intr_retry+28>:       cmp  %l2, -1
0x00000000010092c4 <sparc_intr_retry+32>:       be,pn   %xcc,  
0x1009330 <intrcmplt>
0x00000000010092c8 <sparc_intr_retry+36>:       mov  -1, %l7
0x00000000010092cc <sparc_intr_retry+40>:       membar  #LoadStore
0x00000000010092d0 <sparc_intr_retry+44>:       casxa  [ %l4 ]  
#ASI_N, %l2, %l7
0x00000000010092d4 <sparc_intr_retry+48>:       cmp  %l7, %l2
0x00000000010092d8 <sparc_intr_retry+52>:       bne,pn   %icc,  
0x10092b8 <sparc_intr_retry+20>
0x00000000010092dc <sparc_intr_retry+56>:       nop
0x00000000010092e0 <sparc_intr_retry+60>:       add  %sp, 0x8af, %o2
0x00000000010092e4 <sparc_intr_retry+64>:       ldx  [ %l2 + 0x30 ], %l7
0x00000000010092e8 <sparc_intr_retry+68>:       membar  #LoadStore
0x00000000010092ec <sparc_intr_retry+72>:       clrx  [ %l2 + 0x30 ]
0x00000000010092f0 <sparc_intr_retry+76>:       membar  #Sync

the panic came from 0x00000000010092e4 <sparc_intr_retry+64>

have fun
Michael

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