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/*
* cpu_accel.c
* Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* 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"
#if defined(MMX_SUPPORT) || defined(INTEL)
#define ARCH_X86 1
#endif
#include <inttypes.h>
#include "mm_accel.h"
#ifdef ARCH_X86
static uint32_t arch_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_MMX | MM_ACCEL_X86_MMXEXT;
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 /* ARCH_X86 */
#ifdef ARCH_PPC
#include <signal.h>
#include <setjmp.h>
static sigjmp_buf jmpbuf;
static volatile sig_atomic_t canjump = 0;
static RETSIGTYPE sigill_handler (int sig)
{
if (!canjump) {
signal (sig, SIG_DFL);
raise (sig);
}
canjump = 0;
siglongjmp (jmpbuf, 1);
}
static uint32_t arch_accel (void)
{
signal (SIGILL, sigill_handler);
if (sigsetjmp (jmpbuf, 1)) {
signal (SIGILL, SIG_DFL);
return 0;
}
canjump = 1;
__asm__ volatile ("mtspr 256,%0" :: "r" (-1));
signal (SIGILL, SIG_DFL);
return MM_ACCEL_PPC_ALTIVEC;
}
#endif /* ARCH_PPC */
uint32_t mm_accel (void)
{
#if defined (ARCH_X86) || defined (ARCH_PPC)
static int got_accel = 0;
static uint32_t accel;
if (!got_accel) {
got_accel = 1;
accel = arch_accel ();
}
return accel;
#else
return 0;
#endif
}
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