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VLC Source 0.5.3.dmg
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cpu.c
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2002-12-12
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/*****************************************************************************
* cpu.c: CPU detection code
*****************************************************************************
* Copyright (C) 1998-2002 VideoLAN
* $Id: cpu.c,v 1.10 2002/12/06 16:34:08 sam Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Christophe Massiot <massiot@via.ecp.fr>
* Eugenio Jarosiewicz <ej0@cise.ufl.eduEujenio>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <vlc/vlc.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h> /* SIGHUP, SIGINT, SIGKILL */
# include <setjmp.h> /* longjmp, setjmp */
#endif
#ifdef SYS_DARWIN
# include <mach/mach.h> /* AltiVec detection */
# include <mach/mach_error.h> /* some day the header files||compiler *
will define it for us */
# include <mach/bootstrap.h>
#endif
#include "vlc_cpu.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
#ifdef HAVE_SIGNAL_H
static void SigHandler ( int );
#endif
/*****************************************************************************
* Global variables - they're needed for signal handling
*****************************************************************************/
#ifdef HAVE_SIGNAL_H
static jmp_buf env;
static int i_illegal;
#if defined( __i386__ )
static char *psz_capability;
#endif
#endif
/*****************************************************************************
* CPUCapabilities: get the CPU capabilities
*****************************************************************************
* This function is called to list extensions the CPU may have.
*****************************************************************************/
uint32_t CPUCapabilities( void )
{
volatile uint32_t i_capabilities = CPU_CAPABILITY_NONE;
#if defined( SYS_DARWIN )
struct host_basic_info hi;
kern_return_t ret;
host_name_port_t host;
int i_size;
char *psz_name, *psz_subname;
i_capabilities |= CPU_CAPABILITY_FPU;
/* Should 'never' fail? */
host = mach_host_self();
i_size = sizeof( hi ) / sizeof( int );
ret = host_info( host, HOST_BASIC_INFO, ( host_info_t )&hi, &i_size );
if( ret != KERN_SUCCESS )
{
fprintf( stderr, "error: couldn't get CPU information\n" );
return i_capabilities;
}
slot_name( hi.cpu_type, hi.cpu_subtype, &psz_name, &psz_subname );
/* FIXME: need better way to detect newer proccessors.
* could do strncmp(a,b,5), but that's real ugly */
if( !strcmp(psz_name, "ppc7400") || !strcmp(psz_name, "ppc7450") )
{
i_capabilities |= CPU_CAPABILITY_ALTIVEC;
}
return i_capabilities;
#elif defined( __i386__ )
volatile unsigned int i_eax, i_ebx, i_ecx, i_edx;
volatile vlc_bool_t b_amd;
/* Needed for x86 CPU capabilities detection */
# define cpuid( reg ) \
asm volatile ( "pushl %%ebx\n\t" \
"cpuid\n\t" \
"movl %%ebx,%1\n\t" \
"popl %%ebx\n\t" \
: "=a" ( i_eax ), \
"=r" ( i_ebx ), \
"=c" ( i_ecx ), \
"=d" ( i_edx ) \
: "a" ( reg ) \
: "cc" );
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
void (*pf_sigill) (int) = signal( SIGILL, SigHandler );
# endif
i_capabilities |= CPU_CAPABILITY_FPU;
/* test for a 486 CPU */
asm volatile ( "pushl %%ebx\n\t"
"pushfl\n\t"
"popl %%eax\n\t"
"movl %%eax, %%ebx\n\t"
"xorl $0x200000, %%eax\n\t"
"pushl %%eax\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %%eax\n\t"
"movl %%ebx,%1\n\t"
"popl %%ebx\n\t"
: "=a" ( i_eax ),
"=r" ( i_ebx )
:
: "cc" );
if( i_eax == i_ebx )
{
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
}
i_capabilities |= CPU_CAPABILITY_486;
/* the CPU supports the CPUID instruction - get its level */
cpuid( 0x00000000 );
if( !i_eax )
{
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
}
/* FIXME: this isn't correct, since some 486s have cpuid */
i_capabilities |= CPU_CAPABILITY_586;
/* borrowed from mpeg2dec */
b_amd = ( i_ebx == 0x68747541 ) && ( i_ecx == 0x444d4163 )
&& ( i_edx == 0x69746e65 );
/* test for the MMX flag */
cpuid( 0x00000001 );
if( ! (i_edx & 0x00800000) )
{
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
}
i_capabilities |= CPU_CAPABILITY_MMX;
if( i_edx & 0x02000000 )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
# ifdef CAN_COMPILE_SSE
/* We test if OS supports the SSE instructions */
psz_capability = "SSE";
i_illegal = 0;
if( setjmp( env ) == 0 )
{
/* Test a SSE instruction */
__asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
}
if( i_illegal == 0 )
{
i_capabilities |= CPU_CAPABILITY_SSE;
}
# endif
}
/* test for additional capabilities */
cpuid( 0x80000000 );
if( i_eax < 0x80000001 )
{
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
}
/* list these additional capabilities */
cpuid( 0x80000001 );
# ifdef CAN_COMPILE_3DNOW
if( i_edx & 0x80000000 )
{
psz_capability = "3D Now!";
i_illegal = 0;
if( setjmp( env ) == 0 )
{
/* Test a 3D Now! instruction */
__asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
}
if( i_illegal == 0 )
{
i_capabilities |= CPU_CAPABILITY_3DNOW;
}
}
# endif
if( b_amd && ( i_edx & 0x00400000 ) )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
&& defined( HAVE_SIGNAL_H )
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
#elif defined( __powerpc__ )
# ifdef CAN_COMPILE_ALTIVEC && defined( HAVE_SIGNAL_H )
void (*pf_sigill) (int) = signal( SIGILL, SigHandler );
i_capabilities |= CPU_CAPABILITY_FPU;
i_illegal = 0;
if( setjmp( env ) == 0 )
{
asm volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
}
if( i_illegal == 0 )
{
i_capabilities |= CPU_CAPABILITY_ALTIVEC;
}
signal( SIGILL, pf_sigill );
# endif
return i_capabilities;
#elif defined( __sparc__ )
i_capabilities |= CPU_CAPABILITY_FPU;
return i_capabilities;
#else
/* default behaviour */
return i_capabilities;
#endif
}
/*****************************************************************************
* SigHandler: system signal handler
*****************************************************************************
* This function is called when an illegal instruction signal is received by
* the program. We use this function to test OS and CPU capabilities
*****************************************************************************/
#if defined( HAVE_SIGNAL_H )
static void SigHandler( int i_signal )
{
/* Acknowledge the signal received */
i_illegal = 1;
#ifdef HAVE_SIGRELSE
sigrelse( i_signal );
#endif
#if defined( __i386__ )
fprintf( stderr, "warning: your CPU has %s instructions, but not your "
"operating system.\n", psz_capability );
fprintf( stderr, " some optimizations will be disabled unless "
"you upgrade your OS\n" );
# if defined( SYS_LINUX )
fprintf( stderr, " (for instance Linux kernel 2.4.x or later)\n" );
# endif
#endif
longjmp( env, 1 );
}
#endif