code.delx.au - pulseaudio/blob - src/pulsecore/cpu-x86.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdint.h>
  28
  29 #include <pulsecore/log.h>
  30
  31 #include "cpu-x86.h"
  32
  33 #if defined (__i386__) || defined (__amd64__)
  34 static void
  35 get_cpuid (uint32_t op, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
  36 {
  37     __asm__ __volatile__ (
  38         "  push %%"PA_REG_b"   \n\t"
  39         "  cpuid               \n\t"
  40         "  mov %%ebx, %%esi    \n\t"
  41         "  pop %%"PA_REG_b"    \n\t"
  42
  43         : "=a" (*a), "=S" (*b), "=c" (*c), "=d" (*d)
  44         : "0" (op)
  45     );
  46 }
  47 #endif
  48
  49 void pa_cpu_init_x86 (void) {
  50 #if defined (__i386__) || defined (__amd64__)
  51     uint32_t eax, ebx, ecx, edx;
  52     uint32_t level;
  53     pa_cpu_x86_flag_t flags = 0;
  54
  55     /* get standard level */
  56     get_cpuid (0x00000000, &level, &ebx, &ecx, &edx);
  57     if (level >= 1) {
  58         get_cpuid (0x00000001, &eax, &ebx, &ecx, &edx);
  59
  60         if (edx & (1<<23))
  61           flags |= PA_CPU_X86_MMX;
  62
  63         if (edx & (1<<25))
  64           flags |= PA_CPU_X86_SSE;
  65
  66         if (edx & (1<<26))
  67           flags |= PA_CPU_X86_SSE2;
  68
  69         if (ecx & (1<<0))
  70           flags |= PA_CPU_X86_SSE3;
  71
  72         if (ecx & (1<<9))
  73           flags |= PA_CPU_X86_SSSE3;
  74
  75         if (ecx & (1<<19))
  76           flags |= PA_CPU_X86_SSE4_1;
  77
  78         if (ecx & (1<<20))
  79           flags |= PA_CPU_X86_SSE4_2;
  80     }
  81
  82     /* get extended level */
  83     get_cpuid (0x80000000, &level, &ebx, &ecx, &edx);
  84     if (level >= 0x80000001) {
  85         get_cpuid (0x80000001, &eax, &ebx, &ecx, &edx);
  86
  87         if (edx & (1<<22))
  88           flags |= PA_CPU_X86_MMXEXT;
  89
  90         if (edx & (1<<23))
  91           flags |= PA_CPU_X86_MMX;
  92
  93         if (edx & (1<<30))
  94           flags |= PA_CPU_X86_3DNOWEXT;
  95
  96         if (edx & (1<<31))
  97           flags |= PA_CPU_X86_3DNOW;
  98     }
  99
 100     pa_log_info ("CPU flags: %s%s%s%s%s%s%s%s%s%s",
 101     (flags & PA_CPU_X86_MMX) ? "MMX " : "",
 102     (flags & PA_CPU_X86_SSE) ? "SSE " : "",
 103     (flags & PA_CPU_X86_SSE2) ? "SSE2 " : "",
 104     (flags & PA_CPU_X86_SSE3) ? "SSE3 " : "",
 105     (flags & PA_CPU_X86_SSSE3) ? "SSSE3 " : "",
 106     (flags & PA_CPU_X86_SSE4_1) ? "SSE4_1 " : "",
 107     (flags & PA_CPU_X86_SSE4_2) ? "SSE4_2 " : "",
 108     (flags & PA_CPU_X86_MMXEXT) ? "MMXEXT " : "",
 109     (flags & PA_CPU_X86_3DNOW) ? "3DNOW " : "",
 110     (flags & PA_CPU_X86_3DNOWEXT) ? "3DNOWEXT " : "");
 111
 112     /* activate various optimisations */
 113     if (flags & PA_CPU_X86_MMX) {
 114         pa_volume_func_init_mmx (flags);
 115         pa_remap_func_init_mmx (flags);
 116     }
 117
 118     if (flags & PA_CPU_X86_SSE)
 119         pa_volume_func_init_sse (flags);
 120
 121 #endif /* defined (__i386__) || defined (__amd64__) */
 122 }