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cpu-x86: add cpu detection code and helpers

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Add CPU detection code and various macros and typdefs to make it easier to write
64 and 32 bit code.
This commit is contained in:
Wim Taymans 2009-08-13 17:11:43 +02:00
parent 5998cf99b0
commit a83f5524fb
3 changed files with 184 additions and 0 deletions
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122
src/pulsecore/cpu-x86.c Normal file
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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdint.h>
#include <pulsecore/log.h>
#include "cpu-x86.h"
#if defined (__i386__) || defined (__amd64__)
static void
get_cpuid (uint32_t op, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
{
__asm__ __volatile__ (
" push %%"PA_REG_b" \n\t"
" cpuid \n\t"
" mov %%ebx, %%esi \n\t"
" pop %%"PA_REG_b" \n\t"
: "=a" (*a), "=S" (*b), "=c" (*c), "=d" (*d)
: "0" (op));
}
#endif
static pa_cpu_x86_flag_t pa_cpu_x86_flags;
void pa_cpu_init_x86 (void) {
#if defined (__i386__) || defined (__amd64__)
uint32_t eax, ebx, ecx, edx;
uint32_t level;
/* get standard level */
get_cpuid (0x00000000, &level, &ebx, &ecx, &edx);
if (level >= 1) {
get_cpuid (0x00000001, &eax, &ebx, &ecx, &edx);
if (edx & (1<<23))
pa_cpu_x86_flags |= PA_CPU_X86_MMX;
if (edx & (1<<25))
pa_cpu_x86_flags |= PA_CPU_X86_SSE;
if (edx & (1<<26))
pa_cpu_x86_flags |= PA_CPU_X86_SSE2;
if (ecx & (1<<0))
pa_cpu_x86_flags |= PA_CPU_X86_SSE3;
if (ecx & (1<<9))
pa_cpu_x86_flags |= PA_CPU_X86_SSSE3;
if (ecx & (1<<19))
pa_cpu_x86_flags |= PA_CPU_X86_SSE4_1;
if (ecx & (1<<20))
pa_cpu_x86_flags |= PA_CPU_X86_SSE4_2;
}
/* get extended level */
get_cpuid (0x80000000, &level, &ebx, &ecx, &edx);
if (level >= 0x80000001) {
get_cpuid (0x80000001, &eax, &ebx, &ecx, &edx);
if (edx & (1<<22))
pa_cpu_x86_flags |= PA_CPU_X86_MMXEXT;
if (edx & (1<<23))
pa_cpu_x86_flags |= PA_CPU_X86_MMX;
if (edx & (1<<30))
pa_cpu_x86_flags |= PA_CPU_X86_3DNOWEXT;
if (edx & (1<<31))
pa_cpu_x86_flags |= PA_CPU_X86_3DNOW;
}
pa_log_info ("CPU flags: %s%s%s%s%s%s%s%s%s%s",
(pa_cpu_x86_flags & PA_CPU_X86_MMX) ? "MMX " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSE) ? "SSE " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSE2) ? "SSE2 " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSE3) ? "SSE3 " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSSE3) ? "SSSE3 " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSE4_1) ? "SSE4_1 " : "",
(pa_cpu_x86_flags & PA_CPU_X86_SSE4_2) ? "SSE4_2 " : "",
(pa_cpu_x86_flags & PA_CPU_X86_MMXEXT) ? "MMXEXT " : "",
(pa_cpu_x86_flags & PA_CPU_X86_3DNOW) ? "3DNOW " : "",
(pa_cpu_x86_flags & PA_CPU_X86_3DNOWEXT) ? "3DNOWEXT " : "");
/* activate various optimisations */
if (pa_cpu_x86_flags & PA_CPU_X86_MMX) {
pa_volume_func_init_mmx (pa_cpu_x86_flags);
}
if (pa_cpu_x86_flags & PA_CPU_X86_SSE) {
pa_volume_func_init_sse (pa_cpu_x86_flags);
}
#else
pa_cpu_x86_flags = 0;
#endif
}