/*****************************************************************************
* cpu.c: CPU detection code
*****************************************************************************
* Copyright (C) 1998-2004 the VideoLAN team
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "vlc_common.h"
#ifdef HAVE_SIGNAL_H
# include <signal.h> /* SIGHUP, SIGINT, SIGKILL */
# include <setjmp.h> /* longjmp, setjmp */
#endif
#include "libvlc.h"
#if defined(__APPLE__) && (defined(__ppc__) || defined(__ppc64__))
#include <sys/sysctl.h>
#endif
/*****************************************************************************
* 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__ ) || defined( __x86_64__ )
static const 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(__APPLE__) && (defined(__ppc__) || defined(__ppc64__))
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
int i_has_altivec = 0;
size_t i_length = sizeof( i_has_altivec );
int i_error = sysctl( selectors, 2, &i_has_altivec, &i_length, NULL, 0);
i_capabilities |= CPU_CAPABILITY_FPU;
if( i_error == 0 && i_has_altivec != 0 )
i_capabilities |= CPU_CAPABILITY_ALTIVEC;
return i_capabilities;
#elif defined( __i386__ ) || defined( __x86_64__ )
volatile unsigned int i_eax, i_ebx, i_ecx, i_edx;
volatile bool b_amd;
/* Needed for x86 CPU capabilities detection */
# if defined( __x86_64__ )
# define cpuid( reg ) \
asm volatile ( "cpuid\n\t" \
"movl %%ebx,%1\n\t" \
: "=a" ( i_eax ), \
"=b" ( i_ebx ), \
"=c" ( i_ecx ), \
"=d" ( i_edx ) \
: "a" ( reg ) \
: "cc" );
# else
# define cpuid( reg ) \
asm volatile ( "push %%ebx\n\t" \
"cpuid\n\t" \
"movl %%ebx,%1\n\t" \
"pop %%ebx\n\t" \
: "=a" ( i_eax ), \
"=r" ( i_ebx ), \
"=c" ( i_ecx ), \
"=d" ( i_edx ) \
: "a" ( reg ) \
: "cc" );
# endif
# 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;
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
}
if( i_edx & 0x04000000 )
{
# if defined(CAN_COMPILE_SSE)
/* We test if OS supports the SSE instructions */
psz_capability = "SSE2";
i_illegal = 0;
if( setjmp( env ) == 0 )
{
/* Test a SSE2 instruction */
__asm__ __volatile__ ( "movupd %%xmm0, %%xmm0\n" : : );
}
if( i_illegal == 0 )
{
i_capabilities |= CPU_CAPABILITY_SSE2;
}
# 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__ ) || defined( __ppc__ ) || defined( __ppc64__ )
# 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 );
# else
(void)SigHandler; /* Don't complain about dead code here */
# endif
return i_capabilities;
#elif defined( __sparc__ )
i_capabilities |= CPU_CAPABILITY_FPU;
return i_capabilities;
#elif defined( _MSC_VER ) && !defined( UNDER_CE )
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 );
#else
VLC_UNUSED( 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( __linux__ )
fprintf( stderr, " (for instance Linux kernel 2.4.x or later)\n" );
# endif
#endif
longjmp( env, 1 );
}
#endif
uint32_t cpu_flags = 0;
/*****************************************************************************
* vlc_CPU: get pre-computed CPU capability flags
****************************************************************************/
unsigned vlc_CPU (void)
{
return cpu_flags;
}
static vlc_memcpy_t pf_vlc_memcpy = memcpy;
static vlc_memset_t pf_vlc_memset = memset;
void vlc_fastmem_register (vlc_memcpy_t cpy, vlc_memset_t set)
{
if (cpy)
pf_vlc_memcpy = cpy;
if (set)
pf_vlc_memset = set;
}
/**
* vlc_memcpy: fast CPU-dependent memcpy
*/
void *vlc_memcpy (void *tgt, const void *src, size_t n)
{
return pf_vlc_memcpy (tgt, src, n);
}
/**
* vlc_memset: fast CPU-dependent memset
*/
void *vlc_memset (void *tgt, int c, size_t n)
{
return pf_vlc_memset (tgt, c, n);
}
