mirror of
https://github.com/mpv-player/mpv
synced 2024-12-09 08:29:42 +00:00
176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
|
/*
|
||
|
* cpu_accel.c
|
||
|
* Copyright (C) 2000-2002 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"
|
||
|
|
||
|
#include <inttypes.h>
|
||
|
|
||
|
#include "mpeg2.h"
|
||
|
|
||
|
#ifdef ACCEL_DETECT
|
||
|
#ifdef ARCH_X86
|
||
|
static inline 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__ ("push %%ebx\n\t" \
|
||
|
"cpuid\n\t" \
|
||
|
"movl %%ebx,%1\n\t" \
|
||
|
"pop %%ebx" \
|
||
|
: "=a" (eax), \
|
||
|
"=r" (ebx), \
|
||
|
"=c" (ecx), \
|
||
|
"=d" (edx) \
|
||
|
: "a" (op) \
|
||
|
: "cc")
|
||
|
#endif
|
||
|
|
||
|
__asm__ ("pushf\n\t"
|
||
|
"pushf\n\t"
|
||
|
"pop %0\n\t"
|
||
|
"movl %0,%1\n\t"
|
||
|
"xorl $0x200000,%0\n\t"
|
||
|
"push %0\n\t"
|
||
|
"popf\n\t"
|
||
|
"pushf\n\t"
|
||
|
"pop %0\n\t"
|
||
|
"popf"
|
||
|
: "=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 = MPEG2_ACCEL_X86_MMX;
|
||
|
if (edx & 0x02000000) /* SSE - identical to AMD MMX extensions */
|
||
|
caps = MPEG2_ACCEL_X86_MMX | MPEG2_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 |= MPEG2_ACCEL_X86_3DNOW;
|
||
|
|
||
|
if (AMD && (edx & 0x00400000)) /* AMD MMX extensions */
|
||
|
caps |= MPEG2_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 inline 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\n\t"
|
||
|
"vand %%v0, %%v0, %%v0"
|
||
|
:
|
||
|
: "r" (-1));
|
||
|
|
||
|
signal (SIGILL, SIG_DFL);
|
||
|
return MPEG2_ACCEL_PPC_ALTIVEC;
|
||
|
}
|
||
|
#endif /* ARCH_PPC */
|
||
|
|
||
|
#ifdef ARCH_ALPHA
|
||
|
static inline uint32_t arch_accel (void)
|
||
|
{
|
||
|
uint64_t no_mvi;
|
||
|
|
||
|
asm volatile ("amask %1, %0"
|
||
|
: "=r" (no_mvi)
|
||
|
: "rI" (256)); /* AMASK_MVI */
|
||
|
return no_mvi ? MPEG2_ACCEL_ALPHA : (MPEG2_ACCEL_ALPHA |
|
||
|
MPEG2_ACCEL_ALPHA_MVI);
|
||
|
}
|
||
|
#endif /* ARCH_ALPHA */
|
||
|
#endif
|
||
|
|
||
|
uint32_t mpeg2_detect_accel (void)
|
||
|
{
|
||
|
uint32_t accel;
|
||
|
|
||
|
accel = 0;
|
||
|
#ifdef ACCEL_DETECT
|
||
|
#ifdef LIBMPEG2_MLIB
|
||
|
accel = MPEG2_ACCEL_MLIB;
|
||
|
#endif
|
||
|
#if defined (ARCH_X86) || defined (ARCH_PPC) || defined (ARCH_ALPHA)
|
||
|
accel |= arch_accel ();
|
||
|
#endif
|
||
|
#endif
|
||
|
return accel;
|
||
|
}
|