1 /*****************************************************************************
2 * cpu.c: CPU detection code
3 *****************************************************************************
4 * Copyright (C) 1998-2002 VideoLAN
5 * $Id: cpu.c,v 1.1 2002/06/01 12:32:01 sam Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
29 #include <signal.h> /* SIGHUP, SIGINT, SIGKILL */
30 #include <setjmp.h> /* longjmp, setjmp */
35 # include <mach/mach.h> /* AltiVec detection */
36 # include <mach/mach_error.h> /* some day the header files||compiler *
37 will define it for us */
38 # include <mach/bootstrap.h>
43 /*****************************************************************************
45 *****************************************************************************/
46 static void IllegalSignalHandler( int i_signal );
48 /*****************************************************************************
49 * Global variables - they're needed for signal handling
50 *****************************************************************************/
53 static char *psz_capability;
55 /*****************************************************************************
56 * CPUCapabilities: list the processors MMX support and other capabilities
57 *****************************************************************************
58 * This function is called to list extensions the CPU may have.
59 *****************************************************************************/
60 u32 CPUCapabilities( vlc_object_t *p_this )
62 volatile u32 i_capabilities = CPU_CAPABILITY_NONE;
64 #if defined( SYS_DARWIN )
65 struct host_basic_info hi;
67 host_name_port_t host;
70 char *psz_name, *psz_subname;
72 i_capabilities |= CPU_CAPABILITY_FPU;
74 /* Should 'never' fail? */
75 host = mach_host_self();
77 i_size = sizeof( hi ) / sizeof( int );
78 ret = host_info( host, HOST_BASIC_INFO, ( host_info_t )&hi, &i_size );
80 if( ret != KERN_SUCCESS )
82 fprintf( stderr, "error: couldn't get CPU information\n" );
83 return( i_capabilities );
86 slot_name( hi.cpu_type, hi.cpu_subtype, &psz_name, &psz_subname );
87 /* FIXME: need better way to detect newer proccessors.
88 * could do strncmp(a,b,5), but that's real ugly */
89 if( !strcmp(psz_name, "ppc7400") || !strcmp(psz_name, "ppc7450") )
91 i_capabilities |= CPU_CAPABILITY_ALTIVEC;
94 return( i_capabilities );
96 #elif defined( __i386__ )
97 volatile unsigned int i_eax, i_ebx, i_ecx, i_edx;
98 volatile vlc_bool_t b_amd;
100 /* Needed for x86 CPU capabilities detection */
101 # define cpuid( a ) \
102 asm volatile ( "pushl %%ebx\n\t" \
104 "movl %%ebx,%1\n\t" \
113 i_capabilities |= CPU_CAPABILITY_FPU;
115 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
116 signal( SIGILL, IllegalSignalHandler );
119 /* test for a 486 CPU */
120 asm volatile ( "pushl %%ebx\n\t"
123 "movl %%eax, %%ebx\n\t"
124 "xorl $0x200000, %%eax\n\t"
138 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
139 signal( SIGILL, NULL );
141 return( i_capabilities );
144 i_capabilities |= CPU_CAPABILITY_486;
146 /* the CPU supports the CPUID instruction - get its level */
151 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
152 signal( SIGILL, NULL );
154 return( i_capabilities );
157 /* FIXME: this isn't correct, since some 486s have cpuid */
158 i_capabilities |= CPU_CAPABILITY_586;
160 /* borrowed from mpeg2dec */
161 b_amd = ( i_ebx == 0x68747541 ) && ( i_ecx == 0x444d4163 )
162 && ( i_edx == 0x69746e65 );
164 /* test for the MMX flag */
167 if( ! (i_edx & 0x00800000) )
169 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
170 signal( SIGILL, NULL );
172 return( i_capabilities );
175 i_capabilities |= CPU_CAPABILITY_MMX;
177 if( i_edx & 0x02000000 )
179 i_capabilities |= CPU_CAPABILITY_MMXEXT;
181 # ifdef CAN_COMPILE_SSE
182 /* We test if OS supports the SSE instructions */
183 psz_capability = "SSE";
186 vlc_mutex_lock( p_this->p_vlc->p_global_lock );
187 if( setjmp( env ) == 0 )
189 /* Test a SSE instruction */
190 __asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
192 vlc_mutex_unlock( p_this->p_vlc->p_global_lock );
196 i_capabilities |= CPU_CAPABILITY_SSE;
201 /* test for additional capabilities */
204 if( i_eax < 0x80000001 )
206 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
207 signal( SIGILL, NULL );
209 return( i_capabilities );
212 /* list these additional capabilities */
215 # ifdef CAN_COMPILE_3DNOW
216 if( i_edx & 0x80000000 )
218 psz_capability = "3D Now!";
221 vlc_mutex_lock( p_this->p_vlc->p_global_lock );
222 if( setjmp( env ) == 0 )
224 /* Test a 3D Now! instruction */
225 __asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
227 vlc_mutex_unlock( p_this->p_vlc->p_global_lock );
231 i_capabilities |= CPU_CAPABILITY_3DNOW;
236 if( b_amd && ( i_edx & 0x00400000 ) )
238 i_capabilities |= CPU_CAPABILITY_MMXEXT;
241 # if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW )
242 signal( SIGILL, NULL );
244 return( i_capabilities );
246 #elif defined( __powerpc__ )
248 i_capabilities |= CPU_CAPABILITY_FPU;
250 # ifdef CAN_COMPILE_ALTIVEC
251 signal( SIGILL, IllegalSignalHandler );
253 psz_capability = "AltiVec";
256 vlc_mutex_lock( p_this->p_vlc->p_global_lock );
257 if( setjmp( env ) == 0 )
259 asm volatile ("mtspr 256, %0\n\t"
260 "vand %%v0, %%v0, %%v0"
264 vlc_mutex_unlock( p_this->p_vlc->p_global_lock );
268 i_capabilities |= CPU_CAPABILITY_ALTIVEC;
271 signal( SIGILL, NULL );
274 return( i_capabilities );
276 #elif defined( __sparc__ )
278 i_capabilities |= CPU_CAPABILITY_FPU;
279 return( i_capabilities );
282 /* default behaviour */
283 return( i_capabilities );
288 /*****************************************************************************
289 * IllegalSignalHandler: system signal handler
290 *****************************************************************************
291 * This function is called when an illegal instruction signal is received by
292 * the program. We use this function to test OS and CPU capabilities
293 *****************************************************************************/
294 static void IllegalSignalHandler( int i_signal )
296 /* Acknowledge the signal received */
300 sigrelse( i_signal );
303 #if defined( __i386__ )
304 fprintf( stderr, "warning: your CPU has %s instructions, but not your "
305 "operating system.\n", psz_capability );
306 fprintf( stderr, " some optimizations will be disabled unless "
307 "you upgrade your OS\n" );
308 # if defined( SYS_LINUX )
309 fprintf( stderr, " (for instance Linux kernel 2.4.x or later)\n" );