2011-03-11 11:57:03 +01:00
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/*
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getcpucpuflags: get cpuflags for ia32
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copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http:#mpg123.org
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initially written by KIMURA Takuhiro (for 3DNow!)
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extended for general use by Thomas Orgis
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extern int getcpuid(struct cpuflags*)
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or just
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extern int getcpuid(unsigned int*)
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where there is memory for 4 ints
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-> the first set of idflags (basic cpu family info)
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and the idflags, stdflags, std2flags, extflags written to the parameter
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-> 0x00000000 (CPUID instruction not supported)
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*/
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#include "mangle.h"
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.text
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ALIGN4
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.globl ASM_NAME(getcpuflags)
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/* .type ASM_NAME(getcpuflags),@function */
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ASM_NAME(getcpuflags):
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pushl %ebp
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movl %esp,%ebp
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %esi
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/* get the int pointer for storing the flags */
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movl 8(%ebp), %esi
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/* does that one make sense? */
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movl $0x80000000,%eax
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/* now save the flags and do a check for cpuid availability */
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pushfl
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pushfl
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popl %eax
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movl %eax,%ebx
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/* set that bit... */
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xorl $0x00200000,%eax
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pushl %eax
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popfl
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/* ...and read back the flags to see if it is understood */
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pushfl
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popl %eax
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popfl
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cmpl %ebx,%eax
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je .Lnocpuid
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/* In principle, I would have to check the CPU's identify first to be sure how to interpret the extended flags. */
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/* now get the info, first extended */
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movl $0x0, 12(%esi) /* clear value */
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/* only if supported... */
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movl $0x80000000, %eax
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cpuid
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/* IDT CPUs should not change EAX, generally I hope that non-3DNow cpus do not set a bogus support level here. */
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cmpl $0x80000001, %eax
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jb .Lnoextended /* Skip ext check without minimal support level. */
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/* is supported, get flags value */
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movl $0x80000001,%eax
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cpuid
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movl %edx,12(%esi)
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.Lnoextended:
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/* then the other ones, called last to get the id flags in %eax for ret */
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movl $0x00000001,%eax
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cpuid
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movl %eax, (%esi)
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movl %ecx, 4(%esi)
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movl %edx, 8(%esi)
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jmp .Lend
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ALIGN4
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.Lnocpuid:
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/* error: set everything to zero */
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movl $0, %eax
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movl $0, (%esi)
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movl $0, 4(%esi)
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movl $0, 8(%esi)
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movl $0, 12(%esi)
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ALIGN4
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.Lend:
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/* return value are the id flags, still stored in %eax */
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popl %esi
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popl %ebx
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popl %ecx
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popl %edx
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movl %ebp,%esp
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popl %ebp
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ret
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2013-10-02 18:44:03 +02:00
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NONEXEC_STACK
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