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Diffstat (limited to 'mpeglib/lib/util/mmx/cpu_accel.c')
-rw-r--r--mpeglib/lib/util/mmx/cpu_accel.c162
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
+}