1 /*****************************************************************************
2 * cpu.c: CPU detection code
3 *****************************************************************************
4 * Copyright (C) 1998-2004 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Christophe Massiot <massiot@via.ecp.fr>
9 * Eugenio Jarosiewicz <ej0@cise.ufl.eduEujenio>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
33 #include <vlc_common.h>
35 #include <sys/types.h>
36 #include <signal.h> /* SIGHUP, SIGINT, SIGKILL */
44 #if defined(__APPLE__) && (defined(__ppc__) || defined(__ppc64__))
45 #include <sys/sysctl.h>
48 #if defined( __i386__ ) || defined( __x86_64__ ) \
49 || defined( __ppc__ ) || defined( __ppc64__ )
50 static bool check_OS_capability( const char *psz_capability, pid_t pid )
56 return false; /* fail safe :-/ */
58 while( waitpid( pid, &status, 0 ) == -1 );
60 if( WIFEXITED( status ) && WEXITSTATUS( status ) == 0 )
63 fprintf( stderr, "warning: your CPU has %s instructions, but not your "
64 "operating system.\n", psz_capability );
65 fprintf( stderr, " some optimizations will be disabled unless "
66 "you upgrade your OS\n" );
70 # define fork() (errno = ENOSYS, -1)
78 /*****************************************************************************
79 * CPUCapabilities: get the CPU capabilities
80 *****************************************************************************
81 * This function is called to list extensions the CPU may have.
82 *****************************************************************************/
83 uint32_t CPUCapabilities( void )
85 uint32_t i_capabilities = CPU_CAPABILITY_NONE;
87 #if defined( __i386__ ) || defined( __x86_64__ )
88 unsigned int i_eax, i_ebx, i_ecx, i_edx;
91 /* Needed for x86 CPU capabilities detection */
92 # if defined( __x86_64__ )
93 # define cpuid( reg ) \
94 asm volatile ( "cpuid\n\t" \
103 # define cpuid( reg ) \
104 asm volatile ( "push %%ebx\n\t" \
106 "movl %%ebx,%1\n\t" \
116 i_capabilities |= CPU_CAPABILITY_FPU;
118 # if defined( __i386__ )
119 /* check if cpuid instruction is supported */
120 asm volatile ( "push %%ebx\n\t"
123 "movl %%eax, %%ebx\n\t"
124 "xorl $0x200000, %%eax\n\t"
139 /* x86_64 supports cpuid instruction, so we dont need to check it */
142 i_capabilities |= CPU_CAPABILITY_486;
144 /* the CPU supports the CPUID instruction - get its level */
150 /* FIXME: this isn't correct, since some 486s have cpuid */
151 i_capabilities |= CPU_CAPABILITY_586;
153 /* borrowed from mpeg2dec */
154 b_amd = ( i_ebx == 0x68747541 ) && ( i_ecx == 0x444d4163 )
155 && ( i_edx == 0x69746e65 );
157 /* test for the MMX flag */
160 if( ! (i_edx & 0x00800000) )
163 i_capabilities |= CPU_CAPABILITY_MMX;
165 if( i_edx & 0x02000000 )
167 i_capabilities |= CPU_CAPABILITY_MMXEXT;
169 # ifdef CAN_COMPILE_SSE
170 /* We test if OS supports the SSE instructions */
174 /* Test a SSE instruction */
175 __asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
178 if( check_OS_capability( "SSE", pid ) )
179 i_capabilities |= CPU_CAPABILITY_SSE;
183 if( i_edx & 0x04000000 )
185 # if defined(CAN_COMPILE_SSE)
186 /* We test if OS supports the SSE2 instructions */
190 /* Test a SSE2 instruction */
191 __asm__ __volatile__ ( "movupd %%xmm0, %%xmm0\n" : : );
194 if( check_OS_capability( "SSE2", pid ) )
195 i_capabilities |= CPU_CAPABILITY_SSE2;
199 /* test for additional capabilities */
202 if( i_eax < 0x80000001 )
205 /* list these additional capabilities */
208 # ifdef CAN_COMPILE_3DNOW
209 if( i_edx & 0x80000000 )
214 /* Test a 3D Now! instruction */
215 __asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
218 if( check_OS_capability( "3D Now!", pid ) )
219 i_capabilities |= CPU_CAPABILITY_3DNOW;
223 if( b_amd && ( i_edx & 0x00400000 ) )
225 i_capabilities |= CPU_CAPABILITY_MMXEXT;
229 #elif defined( __arm__ )
230 # if defined( __ARM_EABI__ ) && !defined( __SOFTFP__ )
231 i_capabilities |= CPU_CAPABILITY_FPU;
234 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
236 i_capabilities |= CPU_CAPABILITY_FPU;
238 # if defined(__APPLE__)
239 int selectors[2] = { CTL_HW, HW_VECTORUNIT };
240 int i_has_altivec = 0;
241 size_t i_length = sizeof( i_has_altivec );
242 int i_error = sysctl( selectors, 2, &i_has_altivec, &i_length, NULL, 0);
244 if( i_error == 0 && i_has_altivec != 0 )
245 i_capabilities |= CPU_CAPABILITY_ALTIVEC;
247 # elif defined( CAN_COMPILE_ALTIVEC )
251 asm volatile ("mtspr 256, %0\n\t"
252 "vand %%v0, %%v0, %%v0"
258 if( check_OS_capability( "Altivec", pid ) )
259 i_capabilities |= CPU_CAPABILITY_ALTIVEC;
263 #elif defined( __sparc__ )
264 i_capabilities |= CPU_CAPABILITY_FPU;
266 #elif defined( _MSC_VER ) && !defined( UNDER_CE )
267 i_capabilities |= CPU_CAPABILITY_FPU;
270 return i_capabilities;
273 uint32_t cpu_flags = 0;
276 /*****************************************************************************
277 * vlc_CPU: get pre-computed CPU capability flags
278 ****************************************************************************/
279 unsigned vlc_CPU (void)
284 static vlc_memcpy_t pf_vlc_memcpy = memcpy;
285 static vlc_memset_t pf_vlc_memset = memset;
287 void vlc_fastmem_register (vlc_memcpy_t cpy, vlc_memset_t set)
296 * vlc_memcpy: fast CPU-dependent memcpy
298 void *vlc_memcpy (void *tgt, const void *src, size_t n)
300 return pf_vlc_memcpy (tgt, src, n);
304 * vlc_memset: fast CPU-dependent memset
306 void *vlc_memset (void *tgt, int c, size_t n)
308 return pf_vlc_memset (tgt, c, n);