diff options
Diffstat (limited to 'mpeglib/lib/util/mmx/cpu_accel.c')
| -rw-r--r-- | mpeglib/lib/util/mmx/cpu_accel.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/mpeglib/lib/util/mmx/cpu_accel.c b/mpeglib/lib/util/mmx/cpu_accel.c new file mode 100644 index 00000000..8f138308 --- /dev/null +++ b/mpeglib/lib/util/mmx/cpu_accel.c @@ -0,0 +1,162 @@ +/* + * 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 +} |