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1234b1126b
Original commit message from CVS: * gst/gstcpu.c: (gst_cpuid_i386): Don't clobber ebx in inline assembly. gcc doesn't handle it correctly. (bug #141083) * gst/gsttrashstack.h: same
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2003 Colin Walters <walters@verbum.org>
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*
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* gstcpu.c: CPU detection and architecture-specific routines
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <glib.h>
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#include "gst_private.h"
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#include "gstcpu.h"
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#include "gstinfo.h"
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static guint32 _gst_cpu_flags = 0;
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#ifdef HAVE_CPU_I386
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#define _gst_cpu_initialize_arch _gst_cpu_initialize_i386
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gboolean _gst_cpu_initialize_i386 (gulong * flags, GString * featurelist);
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#else
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#define _gst_cpu_initialize_arch _gst_cpu_initialize_none
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gboolean _gst_cpu_initialize_none (gulong * flags, GString * featurelist);
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#endif
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void
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_gst_cpu_initialize (gboolean opt)
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{
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GString *featurelist = g_string_new ("");
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gulong flags = 0;
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if (opt) {
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if (!_gst_cpu_initialize_arch (&flags, featurelist))
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g_string_append (featurelist, "NONE");
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} else
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g_string_append (featurelist, "(DISABLED)");
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GST_CAT_INFO (GST_CAT_GST_INIT, "CPU features: (%08lx) %s", flags,
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featurelist->str);
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g_string_free (featurelist, TRUE);
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}
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gboolean
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_gst_cpu_initialize_none (gulong * flags, GString * featurelist)
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{
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return FALSE;
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}
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#ifdef HAVE_CPU_I386
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static void
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gst_cpuid_i386 (int x, unsigned long *eax, unsigned long *ebx,
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unsigned long *ecx, unsigned long *edx)
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{
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unsigned long regs[4];
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asm (
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/* GCC-3.2 (and possibly others) don't clobber ebx properly,
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* so we save/restore it directly. */
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" pushl %%ebx\n" " cpuid\n" " movl %%eax, %0\n" " movl %%ebx, %1\n" " movl %%ecx, %2\n" " movl %%edx, %3\n" " popl %%ebx\n":"=o" (regs[0]),
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"=o" (regs[1]),
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"=o" (regs[2]), "=o" (regs[3])
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: "a" (x)
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: "ecx", "edx");
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*eax = regs[0];
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*ebx = regs[1];
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*ecx = regs[2];
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*edx = regs[3];
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}
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gboolean
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_gst_cpu_initialize_i386 (gulong * flags, GString * featurelist)
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{
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gboolean AMD;
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gulong eax = 0, ebx = 0, ecx = 0, edx = 0;
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gst_cpuid_i386 (0, &eax, &ebx, &ecx, &edx);
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AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
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gst_cpuid_i386 (1, &eax, &ebx, &ecx, &edx);
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if (edx & (1 << 23)) {
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_gst_cpu_flags |= GST_CPU_FLAG_MMX;
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g_string_append (featurelist, "MMX ");
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if (edx & (1 << 25)) {
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_gst_cpu_flags |= GST_CPU_FLAG_SSE;
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_gst_cpu_flags |= GST_CPU_FLAG_MMXEXT;
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g_string_append (featurelist, "SSE ");
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}
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gst_cpuid_i386 (0x80000000, &eax, &ebx, &ecx, &edx);
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if (eax >= 0x80000001) {
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gst_cpuid_i386 (0x80000001, &eax, &ebx, &ecx, &edx);
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if (edx & (1 << 31)) {
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_gst_cpu_flags |= GST_CPU_FLAG_3DNOW;
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g_string_append (featurelist, "3DNOW ");
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}
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if (AMD && (edx & (1 << 22))) {
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_gst_cpu_flags |= GST_CPU_FLAG_MMXEXT;
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g_string_append (featurelist, "MMXEXT ");
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}
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}
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}
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*flags = eax;
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if (_gst_cpu_flags)
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return TRUE;
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return FALSE;
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}
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#endif
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GstCPUFlags
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gst_cpu_get_flags (void)
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{
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return _gst_cpu_flags;
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}
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