#ifndef WIN32
#include <unistd.h>
#include <sys/wait.h>
+#include <signal.h>
+#else
+#include <errno.h>
#endif
#include "libvlc.h"
#if defined( __i386__ ) || defined( __x86_64__ ) || defined( __powerpc__ ) \
|| defined( __ppc__ ) || defined( __ppc64__ ) || defined( __powerpc64__ )
+# ifndef WIN32
static bool check_OS_capability( const char *psz_capability, pid_t pid )
{
-#ifndef WIN32
int status;
if( pid == -1 )
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
}
+
+# define check_capability(name, flag, code) \
+ do { \
+ pid_t pid = fork(); \
+ if( pid == 0 ) \
+ { \
+ signal(SIGILL, SIG_DFL); \
+ __asm__ __volatile__ ( code : : ); \
+ _exit(0); \
+ } \
+ if( check_OS_capability((name), pid )) \
+ i_capabilities |= (flag); \
+ } while(0)
+
+# else /* WIN32 */
+# define check_capability(name, flag, code) \
+ i_capabilities |= (flag);
+# endif
#endif
/*****************************************************************************
: "a" ( reg ) \
: "cc" );
# endif
-
+ /* Check if the OS really supports the requested instructions */
# if defined (__i386__) && !defined (__i486__) && !defined (__i586__) \
&& !defined (__i686__) && !defined (__pentium4__) \
&& !defined (__k6__) && !defined (__athlon__) && !defined (__k8__)
i_capabilities |= CPU_CAPABILITY_MMXEXT;
# ifdef CAN_COMPILE_SSE
- /* We test if OS supports the SSE instructions */
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a SSE instruction */
- __asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
- exit(0);
- }
- if( check_OS_capability( "SSE", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE;
+ check_capability( "SSE", CPU_CAPABILITY_SSE,
+ "xorps %%xmm0,%%xmm0\n" );
# endif
}
# endif
# if defined (__SSE2__)
i_capabilities |= CPU_CAPABILITY_SSE2;
-# elif defined (CAN_COMPILE_SSE)
+# elif defined (CAN_COMPILE_SSE2)
if( i_edx & 0x04000000 )
- {
- /* 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( check_OS_capability( "SSE2", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE2;
- }
+ check_capability( "SSE2", CPU_CAPABILITY_SSE2,
+ "movupd %%xmm0, %%xmm0\n" );
# endif
# if defined (__SSE3__)
i_capabilities |= CPU_CAPABILITY_SSE3;
# elif defined (CAN_COMPILE_SSE3)
if( i_ecx & 0x00000001 )
- {
- /* We test if OS supports the SSE3 instructions */
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a SSE3 instruction */
- __asm__ __volatile__ ( "movsldup %%xmm1, %%xmm0\n" : : );
- exit(0);
- }
- if( check_OS_capability( "SSE3", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE3;
- }
+ check_capability( "SSE3", CPU_CAPABILITY_SSE3,
+ "movsldup %%xmm1, %%xmm0\n" );
+# endif
+
+# if defined (__SSSE3__)
+ i_capabilities |= CPU_CAPABILITY_SSSE3;
+# elif defined (CAN_COMPILE_SSSE3)
+ if( i_ecx & 0x00000200 )
+ check_capability( "SSSE3", CPU_CAPABILITY_SSSE3,
+ "pabsw %%xmm1, %%xmm0\n" );
+# endif
+
+# if defined (__SSE4_1__)
+ i_capabilities |= CPU_CAPABILITY_SSE4_1;
+# elif defined (CAN_COMPILE_SSE4_1)
+ if( i_ecx & 0x00080000 )
+ check_capability( "SSE4.1", CPU_CAPABILITY_SSE4_1,
+ "pmaxsb %%xmm1, %%xmm0\n" );
+# endif
+
+# if defined (__SSE4_2__)
+ i_capabilities |= CPU_CAPABILITY_SSE4_2;
+# elif defined (CAN_COMPILE_SSE4_2)
+ if( i_ecx & 0x00100000 )
+ check_capability( "SSE4.2", CPU_CAPABILITY_SSE4_2,
+ "pcmpgtq %%xmm1, %%xmm0\n" );
# endif
/* test for additional capabilities */
i_capabilities |= CPU_CAPABILITY_3DNOW;
# elif defined (CAN_COMPILE_3DNOW)
if( i_edx & 0x80000000 )
- {
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a 3D Now! instruction */
- __asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
- exit(0);
- }
- if( check_OS_capability( "3D Now!", pid ) )
- i_capabilities |= CPU_CAPABILITY_3DNOW;
- }
+ check_capability( "3D Now!", CPU_CAPABILITY_3DNOW,
+ "pfadd %%mm0,%%mm0\n" "femms\n" );
# endif
if( b_amd && ( i_edx & 0x00400000 ) )
pid_t pid = fork();
if( pid == 0 )
{
+ signal(SIGILL, SIG_DFL);
asm volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
- exit(0);
+ _exit(0);
}
if( check_OS_capability( "Altivec", pid ) )
return cpu_flags;
}
+const struct
+{
+ uint32_t value;
+ char name[12];
+} cap_dirs[] = {
+#if defined ( __i386__ ) || defined ( __x86_64__ )
+ { CPU_CAPABILITY_MMX, "mmx" },
+ { CPU_CAPABILITY_MMXEXT, "mmxext" },
+ { CPU_CAPABILITY_3DNOW, "3dnow" },
+ { CPU_CAPABILITY_SSE, "sse" },
+#endif
+#if defined (__ppc__) || defined (__ppc64__) || defined (__powerpc__)
+ { CPU_CAPABILITY_ALTIVEC, "altivec" },
+#endif
+#if defined (__arm__)
+ { CPU_CAPABILITY_NEON, "arm_neon" },
+#endif
+};
+
+/**
+ * Return the number of available logical CPU.
+ */
+unsigned vlc_GetCPUCount(void)
+{
+#if defined(WIN32) && !defined(UNDER_CE)
+ DWORD process_mask;
+ DWORD system_mask;
+ if (!GetProcessAffinityMask(GetCurrentProcess(), &process_mask, &system_mask))
+ return 1;
+
+ unsigned count = 0;
+ while (system_mask) {
+ count++;
+ system_mask >>= 1;
+ }
+ return count;
+#elif defined(HAVE_SCHED_GETAFFINITY)
+ cpu_set_t cpu;
+ CPU_ZERO(&cpu);
+ if (sched_getaffinity(0, sizeof(cpu), &cpu) < 0)
+ return 1;
+ unsigned count = 0;
+ for (unsigned i = 0; i < CPU_SETSIZE; i++)
+ count += CPU_ISSET(i, &cpu) != 0;
+ return count;
+#elif defined(__APPLE__)
+ int count;
+ size_t size = sizeof(count) ;
+ if (sysctlbyname("hw.ncpu", &count, &size, NULL, 0))
+ return 1; /* Failure */
+ return count;
+#else
+# warning "vlc_GetCPUCount is not implemented for your platform"
+ return 1;
+#endif
+}
+
+/**
+ * Check if a directory name contains usable plugins w.r.t. the hardware
+ * capabilities. Loading a plugin when the hardware has insufficient
+ * capabilities may lead to illegal instructions (SIGILL) and must be avoided.
+ *
+ * @param name the name of the directory (<b>not</b> the path)
+ *
+ * @return true if the hardware has sufficient capabilities or the directory
+ * does not require any special capability; false if the running hardware has
+ * insufficient capabilities.
+ */
+bool vlc_CPU_CheckPluginDir (const char *name)
+{
+ const unsigned flags = vlc_CPU ();
+ for (size_t i = 0; i < sizeof (cap_dirs) / sizeof (cap_dirs[0]); i++)
+ {
+ if (strcmp (name, cap_dirs[i].name))
+ continue;
+ return (flags & cap_dirs[i].value) != 0;
+ }
+ return true;
+}
+
static vlc_memcpy_t pf_vlc_memcpy = memcpy;
static vlc_memset_t pf_vlc_memset = memset;
projects / vlc / blobdiff