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/*
* cpu_accel.c
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdio.h>
#include <inttypes.h>
#include <signal.h>
#include <setjmp.h>
#include "attributes.h"
#include "xineutils.h"
#ifdef ARCH_X86
static uint32_t x86_accel (void)
{
uint32_t eax, ebx, ecx, edx;
int AMD;
uint32_t caps;
#ifndef PIC
#define cpuid(op,eax,ebx,ecx,edx) \
asm ("cpuid" \
: "=a" (eax), \
"=b" (ebx), \
"=c" (ecx), \
"=d" (edx) \
: "a" (op) \
: "cc")
#else // PIC version : save ebx
#define cpuid(op,eax,ebx,ecx,edx) \
asm ("pushl %%ebx\n\t" \
"cpuid\n\t" \
"movl %%ebx,%1\n\t" \
"popl %%ebx" \
: "=a" (eax), \
"=r" (ebx), \
"=c" (ecx), \
"=d" (edx) \
: "a" (op) \
: "cc")
#endif
asm ("pushfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl $0x200000,%0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"popfl"
: "=r" (eax),
"=r" (ebx)
:
: "cc");
if (eax == ebx) /* no cpuid */
return 0;
cpuid (0x00000000, eax, ebx, ecx, edx);
if (!eax) /* vendor string only */
return 0;
AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
cpuid (0x00000001, eax, ebx, ecx, edx);
if (! (edx & 0x00800000)) /* no MMX */
return 0;
caps = MM_ACCEL_X86_MMX;
if (edx & 0x02000000) /* SSE - identical to AMD MMX extensions */
caps |= MM_ACCEL_X86_SSE | MM_ACCEL_X86_MMXEXT;
if (edx & 0x04000000) /* SSE2 */
caps |= MM_ACCEL_X86_SSE2;
cpuid (0x80000000, eax, ebx, ecx, edx);
if (eax < 0x80000001) /* no extended capabilities */
return caps;
cpuid (0x80000001, eax, ebx, ecx, edx);
if (edx & 0x80000000)
caps |= MM_ACCEL_X86_3DNOW;
if (AMD && (edx & 0x00400000)) /* AMD MMX extensions */
caps |= MM_ACCEL_X86_MMXEXT;
return caps;
}
#endif
static jmp_buf sigill_return;
static void sigill_handler (int n) {
printf ("cpu_accel: OS doesn't support SSE instructions.\n");
longjmp(sigill_return, 1);
}
uint32_t xine_mm_accel (void)
{
#ifdef ARCH_X86
static int got_accel = 0;
static uint32_t accel;
if (!got_accel) {
got_accel = 1;
accel = x86_accel ();
/* test OS support for SSE */
if( accel & MM_ACCEL_X86_SSE ) {
if (setjmp(sigill_return)) {
accel &= ~(MM_ACCEL_X86_SSE|MM_ACCEL_X86_SSE2);
} else {
signal (SIGILL, sigill_handler);
__asm __volatile ("xorps %xmm0, %xmm0");
signal (SIGILL, SIG_DFL);
}
}
}
return accel;
#else
#ifdef HAVE_MLIB
return MM_ACCEL_MLIB;
#else
return 0;
#endif
#endif
}
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