/*****************************************************************************
* cpu.c: CPU detection code
*****************************************************************************
- * Copyright (C) 1998-2004 VideoLAN
+ * Copyright (C) 1998-2004 the VideoLAN team
* $Id$
*
* Authors: Samuel Hocevar <sam@zoy.org>
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <vlc/vlc.h>
+#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 */
+#include <sys/types.h>
+#ifndef WIN32
+#include <unistd.h>
+#include <sys/wait.h>
#endif
-#ifdef SYS_DARWIN
+#include "libvlc.h"
+
+#if defined(__APPLE__) && (defined(__ppc__) || defined(__ppc64__))
#include <sys/sysctl.h>
#endif
-#include "vlc_cpu.h"
+#if defined( __i386__ ) || defined( __x86_64__ ) \
+ || defined( __ppc__ ) || defined( __ppc64__ )
+static bool check_OS_capability( const char *psz_capability, pid_t pid )
+{
+#ifndef WIN32
+ int status;
-/*****************************************************************************
- * Local prototypes
- *****************************************************************************/
-#ifdef HAVE_SIGNAL_H
-static void SigHandler ( int );
-#endif
+ if( pid == -1 )
+ return false; /* fail safe :-/ */
-/*****************************************************************************
- * 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 char *psz_capability;
+ while( waitpid( pid, &status, 0 ) == -1 );
+
+ if( WIFEXITED( status ) && WEXITSTATUS( status ) == 0 )
+ return true;
+
+ 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" );
+ return false;
+#else
+# warning FIXME!
+# define fork() (errno = ENOSYS, -1)
+ (void)pid;
+ (void)psz_capability;
+ return true;
#endif
+}
#endif
/*****************************************************************************
*****************************************************************************/
uint32_t CPUCapabilities( void )
{
- volatile uint32_t i_capabilities = CPU_CAPABILITY_NONE;
-
-#if defined( SYS_DARWIN )
- 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;
+ uint32_t i_capabilities = CPU_CAPABILITY_NONE;
- 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 vlc_bool_t b_amd;
+#if defined( __i386__ ) || defined( __x86_64__ )
+ unsigned int i_eax, i_ebx, i_ecx, i_edx;
+ bool b_amd;
/* Needed for x86 CPU capabilities detection */
# if defined( __x86_64__ )
# define cpuid( reg ) \
- asm volatile ( "push %%rbx\n\t" \
- "cpuid\n\t" \
+ asm volatile ( "cpuid\n\t" \
"movl %%ebx,%1\n\t" \
- "pop %%rbx\n\t" \
: "=a" ( i_eax ), \
- "=r" ( i_ebx ), \
+ "=b" ( 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;
# if defined( __i386__ )
: "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;
- }
+ goto out;
# else
/* x86_64 supports cpuid instruction, so we dont need to check it */
# endif
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;
- }
+ goto out;
/* FIXME: this isn't correct, since some 486s have cpuid */
i_capabilities |= CPU_CAPABILITY_586;
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;
- }
+ goto out;
i_capabilities |= CPU_CAPABILITY_MMX;
# ifdef CAN_COMPILE_SSE
/* We test if OS supports the SSE instructions */
- psz_capability = "SSE";
- i_illegal = 0;
-
- if( setjmp( env ) == 0 )
+ pid_t pid = fork();
+ if( pid == 0 )
{
/* Test a SSE instruction */
__asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
+ exit(0);
}
-
- if( i_illegal == 0 )
- {
+ if( check_OS_capability( "SSE", pid ) )
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 )
+ /* We test if OS supports the SSE2 instructions */
+ pid_t pid = fork();
+ if( pid == 0 )
{
/* Test a SSE2 instruction */
__asm__ __volatile__ ( "movupd %%xmm0, %%xmm0\n" : : );
+ exit(0);
}
-
- if( i_illegal == 0 )
- {
+ if( check_OS_capability( "SSE2", pid ) )
i_capabilities |= CPU_CAPABILITY_SSE2;
- }
# endif
}
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;
- }
+ goto out;
/* 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 )
+ pid_t pid = fork();
+ if( pid == 0 )
{
/* Test a 3D Now! instruction */
__asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
+ exit(0);
}
-
- if( i_illegal == 0 )
- {
+ if( check_OS_capability( "3D Now!", pid ) )
i_capabilities |= CPU_CAPABILITY_3DNOW;
- }
}
# endif
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
+out:
-# if defined( CAN_COMPILE_SSE ) || defined ( CAN_COMPILE_3DNOW ) \
- && defined( HAVE_SIGNAL_H )
- signal( SIGILL, pf_sigill );
+#elif defined( __arm__ )
+# if defined( __ARM_EABI__ ) && !defined( __SOFTFP__ )
+// i_capabilities |= CPU_CAPABILITY_FPU;
+# endif
+# if defined( __ARM_NEON__ )
+ i_capabilities |= CPU_CAPABILITY_NEON;
# endif
- return i_capabilities;
-
-#elif defined( __powerpc__ )
-# ifdef CAN_COMPILE_ALTIVEC && defined( HAVE_SIGNAL_H )
- void (*pf_sigill) (int) = signal( SIGILL, SigHandler );
+#elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
i_capabilities |= CPU_CAPABILITY_FPU;
- i_illegal = 0;
+# if defined(__APPLE__)
+ 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);
+
+ if( i_error == 0 && i_has_altivec != 0 )
+ i_capabilities |= CPU_CAPABILITY_ALTIVEC;
- if( setjmp( env ) == 0 )
+# elif defined( CAN_COMPILE_ALTIVEC )
+ pid_t pid = fork();
+ if( pid == 0 )
{
asm volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
+ exit(0);
}
- if( i_illegal == 0 )
- {
+ if( check_OS_capability( "Altivec", pid ) )
i_capabilities |= CPU_CAPABILITY_ALTIVEC;
- }
- signal( SIGILL, pf_sigill );
# 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
+ return i_capabilities;
}
+uint32_t cpu_flags = 0;
+
+
/*****************************************************************************
- * 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 )
+ * vlc_CPU: get pre-computed CPU capability flags
+ ****************************************************************************/
+unsigned vlc_CPU (void)
{
- /* Acknowledge the signal received */
- i_illegal = 1;
+ return cpu_flags;
+}
-#ifdef HAVE_SIGRELSE
- sigrelse( i_signal );
-#endif
+static vlc_memcpy_t pf_vlc_memcpy = memcpy;
+static vlc_memset_t pf_vlc_memset = memset;
-#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
+void vlc_fastmem_register (vlc_memcpy_t cpy, vlc_memset_t set)
+{
+ if (cpy)
+ pf_vlc_memcpy = cpy;
+ if (set)
+ pf_vlc_memset = set;
+}
- longjmp( env, 1 );
+/**
+ * vlc_memcpy: fast CPU-dependent memcpy
+ */
+void *vlc_memcpy (void *tgt, const void *src, size_t n)
+{
+ return pf_vlc_memcpy (tgt, src, n);
}
-#endif
+/**
+ * vlc_memset: fast CPU-dependent memset
+ */
+void *vlc_memset (void *tgt, int c, size_t n)
+{
+ return pf_vlc_memset (tgt, c, n);
+}
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