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 get_cpuid(uint32_t op, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d) {
  35     __asm__ __volatile__ (
  36         "  push %%"PA_REG_b"   \n\t"
  37         "  cpuid               \n\t"
  38         "  mov %%ebx, %%esi    \n\t"
  39         "  pop %%"PA_REG_b"    \n\t"
  40
  41         : "=a" (*a), "=S" (*b), "=c" (*c), "=d" (*d)
  42         : "0" (op)
  43     );
  44 }
  45 #endif
  46
  47 void pa_cpu_get_x86_flags(pa_cpu_x86_flag_t *flags) {
  48 #if defined (__i386__) || defined (__amd64__)
  49     uint32_t eax, ebx, ecx, edx;
  50     uint32_t level;
  51
  52     *flags = 0;
  53
  54     /* get standard level */
  55     get_cpuid(0x00000000, &level, &ebx, &ecx, &edx);
  56     if (level >= 1) {
  57         get_cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
  58
  59         if (edx & (1<<15))
  60           *flags |= PA_CPU_X86_CMOV;
  61
  62         if (edx & (1<<23))
  63           *flags |= PA_CPU_X86_MMX;
  64
  65         if (edx & (1<<25))
  66           *flags |= PA_CPU_X86_SSE;
  67
  68         if (edx & (1<<26))
  69           *flags |= PA_CPU_X86_SSE2;
  70
  71         if (ecx & (1<<0))
  72           *flags |= PA_CPU_X86_SSE3;
  73
  74         if (ecx & (1<<9))
  75           *flags |= PA_CPU_X86_SSSE3;
  76
  77         if (ecx & (1<<19))
  78           *flags |= PA_CPU_X86_SSE4_1;
  79
  80         if (ecx & (1<<20))
  81           *flags |= PA_CPU_X86_SSE4_2;
  82     }
  83
  84     /* get extended level */
  85     get_cpuid(0x80000000, &level, &ebx, &ecx, &edx);
  86     if (level >= 0x80000001) {
  87         get_cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
  88
  89         if (edx & (1<<22))
  90           *flags |= PA_CPU_X86_MMXEXT;
  91
  92         if (edx & (1<<23))
  93           *flags |= PA_CPU_X86_MMX;
  94
  95         if (edx & (1<<30))
  96           *flags |= PA_CPU_X86_3DNOWEXT;
  97
  98         if (edx & (1<<31))
  99           *flags |= PA_CPU_X86_3DNOW;
 100     }
 101
 102     pa_log_info("CPU flags: %s%s%s%s%s%s%s%s%s%s%s",
 103     (*flags & PA_CPU_X86_CMOV) ? "CMOV " : "",
 104     (*flags & PA_CPU_X86_MMX) ? "MMX " : "",
 105     (*flags & PA_CPU_X86_SSE) ? "SSE " : "",
 106     (*flags & PA_CPU_X86_SSE2) ? "SSE2 " : "",
 107     (*flags & PA_CPU_X86_SSE3) ? "SSE3 " : "",
 108     (*flags & PA_CPU_X86_SSSE3) ? "SSSE3 " : "",
 109     (*flags & PA_CPU_X86_SSE4_1) ? "SSE4_1 " : "",
 110     (*flags & PA_CPU_X86_SSE4_2) ? "SSE4_2 " : "",
 111     (*flags & PA_CPU_X86_MMXEXT) ? "MMXEXT " : "",
 112     (*flags & PA_CPU_X86_3DNOW) ? "3DNOW " : "",
 113     (*flags & PA_CPU_X86_3DNOWEXT) ? "3DNOWEXT " : "");
 114 #endif /* defined (__i386__) || defined (__amd64__) */
 115 }
 116
 117 bool pa_cpu_init_x86(pa_cpu_x86_flag_t *flags) {
 118 #if defined (__i386__) || defined (__amd64__)
 119     pa_cpu_get_x86_flags(flags);
 120
 121     /* activate various optimisations */
 122     if (*flags & PA_CPU_X86_MMX) {
 123         pa_volume_func_init_mmx(*flags);
 124         pa_remap_func_init_mmx(*flags);
 125     }
 126
 127     if (*flags & (PA_CPU_X86_SSE | PA_CPU_X86_SSE2)) {
 128         pa_volume_func_init_sse(*flags);
 129         pa_remap_func_init_sse(*flags);
 130         pa_convert_func_init_sse(*flags);
 131     }
 132
 133     return true;
 134 #else /* defined (__i386__) || defined (__amd64__) */
 135     return false;
 136 #endif /* defined (__i386__) || defined (__amd64__) */
 137 }