Re: mmx instruction support on bohcs

Maybe this should work:

;now enable SSE and the like
mov eax, cr0
and ax, 0xFFFB ;clear coprocessor emulation CR0.EM
or ax, 0x2 ;set coprocessor monitoring CR0.MP
mov cr0, eax
mov eax, cr4
or ax, 3 << 9 ;set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time
mov cr4, eax
ret

More information on http://wiki.osdev.org/SSE

Gesendet: Donnerstag, 25. April 2013 um 19:30 Uhr

Von: Stanislav <[email protected]>

An: "'Hatte John'" <[email protected]>

Cc: [email protected]

Betreff: Re: [Bochs-developers] mmx instruction support on bohcs

By programming correct guest software ?

I'd suggest you to read exceptions information for PXOR instruction in Intel Software Developers manual.

Stanislav

From: Hatte John [mailto:[email protected]]

Sent: Thursday, April 25, 2013 1:09 PM

To: Stanislav Shwartsman

Cc: [email protected]

Subject: Re: [Bochs-developers] mmx instruction support on bohcs

>But if your program doesn't set CR0.EM, CR4.OSFXSR and CR0.TS properly - it will raise exception.

>This is how the arch works.

I use the bochs from web source ,so how to set CR0.EM, CR4.OSFXSR ?

tks!

2013/4/25 Stanislav Shwartsman < [email protected] >

Yes, everything is right. PXOR xmm, xmm is SSE2 instruction (and not MMX) but you have SSE2 enabled.

But if your program doesn't set CR0.EM, CR4.OSFXSR and CR0.TS properly - it will raise exception.

This is how the arch works.

I'd suggest you to read exceptions information for PXOR instruction in Intel Software Developers manual.

Stanislav

On Thu, Apr 25, 2013 at 12:43 PM, Hatte John < [email protected] > wrote:

And I have find some useful clue for that.But I am not quite sure.

at cpu/fetchdecode.cc :

if (! BX_CPU_THIS_PTR sse_ok)

{

if (op_flags & BX_PREPARE_SSE)

{

if (i->execute != &BX_CPU_C::BxError) i->execute = &BX_CPU_C::BxNoSSE;

return(1);

}

sse_ok affect bochs's execution for pxor instr .

And sse_ok is assigned according to some bits of cr0 and cr4.

hope for guide .

2013/4/25 Hatte John < [email protected] >

here is the output at the start of log file :

00000000000i[ ] System configuration

00000000000i[ ] processors: 1 (cores=1, HT threads=1)

00000000000i[ ] A20 line support: yes

00000000000i[ ] IPS is set to 4000000

00000000000i[ ] CPU configuration

00000000000i[ ] level: 6

00000000000i[ ] SMP support: no

00000000000i[ ] APIC support: xapic

00000000000i[ ] FPU support: yes

00000000000i[ ] MMX support: yes

00000000000i[ ] 3dnow! support: no

00000000000i[ ] SEP support: yes

00000000000i[ ] SSE support: sse2

00000000000i[ ] XSAVE support: no

00000000000i[ ] AES support: no

00000000000i[ ] MOVBE support: no

00000000000i[ ] ADX support: no

00000000000i[ ] x86-64 support: no

00000000000i[ ] MWAIT support: yes

My bochs halt at this : 0x40092587: pxor %xmm0,%xmm0 .

Thanks!

2013/4/25 Stanislav < [email protected] >

Not, enough. How about complete config?

What Bochs writes you in the log file when it starts ?

>BTW,do you know some irc channel dedicated to bochs ?

Probably there is old IRC channel but nobody is there ….

Stanislav

From: Hatte John [mailto: [email protected] ]

Sent: Thursday, April 25, 2013 5:40 AM

To: Stanislav

Cc: [email protected]

Subject: Re: [Bochs-developers] mmx instruction support on bohcs

thanks at first .

here is my cpuid config set :cpuid: mmx =1, sep=1 ,and my coulevel is 6

BTW,do you know some irc channel dedicated to bochs ?

2013/4/25 Stanislav < [email protected] >

You didn’t post your .bochsrc and configure options so nobody can guess what are doing wrong …

From: Hatte John [mailto: [email protected] ]

Sent: Wednesday, April 24, 2013 6:52 PM

To: [email protected]

Subject: [Bochs-developers] mmx instruction support on bohcs

My custom bochs can not recognize this inst: pxor %xmm0,%xmm0

I think that is needed one config option set for cpuid in bochsrc file .

how can I write the config option?

I have write mmx=1 , but it can not exec that instrc .

So I am confused . I am using 2.6 version .

Thanks in advance !

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