* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* XXX these includes should probably go into imports.h or glheader.h */
#if defined(USE_SSE_ASM) && defined(__linux__)
-#include <signal.h>
+#include <linux/version.h>
#endif
#if defined(USE_SSE_ASM) && defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
+#if defined(USE_SSE_ASM) && defined(__OpenBSD__)
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <machine/cpu.h>
+#endif
+#include "main/imports.h"
#include "common_x86_asm.h"
-#include "imports.h"
-int _mesa_x86_cpu_features = 0;
+/** Bitmask of X86_FEATURE_x bits */
+int _mesa_x86_cpu_features = 0x0;
+
+static int detection_debug = GL_FALSE;
/* No reason for this to be public.
*/
/*
* We must verify that the Streaming SIMD Extensions are truly supported
* on this processor before we go ahead and hook out the optimized code.
- * Unfortunately, the CPUID bit isn't enough, as the OS must set the
- * OSFXSR bit in CR4 if it supports the extended FPU save and restore
- * required to use SSE. Unfortunately, we can't just go ahead and read
- * this register, as only the kernel can do that. Similarly, we must
- * verify that the OSXMMEXCPT bit in CR4 has been set by the OS,
- * signifying that it supports unmasked SIMD FPU exceptions. If we take
- * an unmasked exception and the OS doesn't correctly support them, the
- * best we'll get is a SIGILL and the worst we'll get is an infinite
- * loop in the signal delivery from the kernel as we can't interact with
- * the SIMD FPU state to clear the exception bits. Either way, this is
- * not good.
*
* However, I have been told by Alan Cox that all 2.4 (and later) Linux
* kernels provide full SSE support on all processors that expose SSE via
- * the CPUID mechanism. It just so happens that this is the exact set of
- * kernels supported DRI. Therefore, when building for DRI the funky SSE
- * exception test is omitted.
+ * the CPUID mechanism.
*/
+/* These are assembly functions: */
extern void _mesa_test_os_sse_support( void );
extern void _mesa_test_os_sse_exception_support( void );
-#if defined(__linux__) && defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC) \
- && !defined(IN_DRI_DRIVER)
-static void sigill_handler( int signal, struct sigcontext sc )
-{
- /*message( "SIGILL, " );*/
-
- /* Both the "xorps %%xmm0,%%xmm0" and "divps %xmm0,%%xmm1"
- * instructions are 3 bytes long. We must increment the instruction
- * pointer manually to avoid repeated execution of the offending
- * instruction.
- *
- * If the SIGILL is caused by a divide-by-zero when unmasked
- * exceptions aren't supported, the SIMD FPU status and control
- * word will be restored at the end of the test, so we don't need
- * to worry about doing it here. Besides, we may not be able to...
- */
- sc.eip += 3;
-
- _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
-}
-
-static void sigfpe_handler( int signal, struct sigcontext sc )
-{
- /*message( "SIGFPE, " );*/
-
- if ( sc.fpstate->magic != 0xffff ) {
- /* Our signal context has the extended FPU state, so reset the
- * divide-by-zero exception mask and clear the divide-by-zero
- * exception bit.
- */
- sc.fpstate->mxcsr |= 0x00000200;
- sc.fpstate->mxcsr &= 0xfffffffb;
- } else {
- /* If we ever get here, we're completely hosed.
- */
- /*message( "\n\n" );*/
- _mesa_problem( NULL, "SSE enabling test failed badly!" );
- }
-}
-#endif /* __linux__ && _POSIX_SOURCE && X86_FXSR_MAGIC */
-#if defined(WIN32)
+#if defined(_WIN32)
#ifndef STATUS_FLOAT_MULTIPLE_TRAPS
# define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L)
#endif
return EXCEPTION_CONTINUE_EXECUTION;
}
-#endif /* WIN32 */
+#endif /* _WIN32 */
-/* If we're running on a processor that can do SSE, let's see if we
- * are allowed to or not. This will catch 2.4.0 or later kernels that
- * haven't been configured for a Pentium III but are running on one,
- * and RedHat patched 2.2 kernels that have broken exception handling
- * support for user space apps that do SSE.
- *
- * GH: Isn't this just awful?
+/**
+ * Check if SSE is supported.
+ * If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features.
*/
-static void check_os_sse_support( void )
+void _mesa_check_os_sse_support( void )
{
-#if defined(__linux__) && !defined(IN_DRI_DRIVER)
-#if defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC)
- struct sigaction saved_sigill;
- struct sigaction saved_sigfpe;
-
- /* Save the original signal handlers.
- */
- sigaction( SIGILL, NULL, &saved_sigill );
- sigaction( SIGFPE, NULL, &saved_sigfpe );
-
- signal( SIGILL, (void (*)(int))sigill_handler );
- signal( SIGFPE, (void (*)(int))sigfpe_handler );
-
- /* Emulate test for OSFXSR in CR4. The OS will set this bit if it
- * supports the extended FPU save and restore required for SSE. If
- * we execute an SSE instruction on a PIII and get a SIGILL, the OS
- * doesn't support Streaming SIMD Exceptions, even if the processor
- * does.
- */
- if ( cpu_has_xmm ) {
- _mesa_debug(NULL, "Testing OS support for SSE...\n");
-
- _mesa_test_os_sse_support();
-
- if ( cpu_has_xmm ) {
- _mesa_debug(NULL, "Yes\n");
- } else {
- _mesa_debug(NULL, "No\n");
- }
- }
-
- /* Emulate test for OSXMMEXCPT in CR4. The OS will set this bit if
- * it supports unmasked SIMD FPU exceptions. If we unmask the
- * exceptions, do a SIMD divide-by-zero and get a SIGILL, the OS
- * doesn't support unmasked SIMD FPU exceptions. If we get a SIGFPE
- * as expected, we're okay but we need to clean up after it.
- *
- * Are we being too stringent in our requirement that the OS support
- * unmasked exceptions? Certain RedHat 2.2 kernels enable SSE by
- * setting CR4.OSFXSR but don't support unmasked exceptions. Win98
- * doesn't even support them. We at least know the user-space SSE
- * support is good in kernels that do support unmasked exceptions,
- * and therefore to be safe I'm going to leave this test in here.
- */
- if ( cpu_has_xmm ) {
- _mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");
-
- _mesa_test_os_sse_exception_support();
-
- if ( cpu_has_xmm ) {
- _mesa_debug(NULL, "Yes.\n");
- } else {
- _mesa_debug(NULL, "No!\n");
- }
- }
-
- /* Restore the original signal handlers.
- */
- sigaction( SIGILL, &saved_sigill, NULL );
- sigaction( SIGFPE, &saved_sigfpe, NULL );
-
- /* If we've gotten to here and the XMM CPUID bit is still set, we're
- * safe to go ahead and hook out the SSE code throughout Mesa.
- */
- if ( cpu_has_xmm ) {
- _mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
- } else {
- _mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
- }
-#else
- /* We can't use POSIX signal handling to test the availability of
- * SSE, so we disable it by default.
- */
- _mesa_debug(NULL, "Cannot test OS support for SSE, disabling to be safe.\n");
- _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
-#endif /* _POSIX_SOURCE && X86_FXSR_MAGIC */
-#elif defined(__FreeBSD__)
+#if defined(__FreeBSD__)
{
int ret, enabled;
unsigned int len;
if (ret || !enabled)
_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
}
-#elif defined(WIN32)
+#elif defined (__NetBSD__)
+ {
+ int ret, enabled;
+ size_t len = sizeof(enabled);
+ ret = sysctlbyname("machdep.sse", &enabled, &len, (void *)NULL, 0);
+ if (ret || !enabled)
+ _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
+ }
+#elif defined(__OpenBSD__)
+ {
+ int mib[2];
+ int ret, enabled;
+ size_t len = sizeof(enabled);
+
+ mib[0] = CTL_MACHDEP;
+ mib[1] = CPU_SSE;
+
+ ret = sysctl(mib, 2, &enabled, &len, NULL, 0);
+ if (ret || !enabled)
+ _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
+ }
+#elif defined(_WIN32)
LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
/* Install our ExceptionFilter */
#else
/* Do nothing on other platforms for now.
*/
- _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
-#endif /* __linux__ */
+ if (detection_debug)
+ _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
+#endif /* __FreeBSD__ */
}
#endif /* USE_SSE_ASM */
-void _mesa_init_all_x86_transform_asm( void )
+/**
+ * Initialize the _mesa_x86_cpu_features bitfield.
+ * This is a no-op if called more than once.
+ */
+void
+_mesa_get_x86_features(void)
{
+ static int called = 0;
+
+ if (called)
+ return;
+
+ called = 1;
+
#ifdef USE_X86_ASM
- _mesa_x86_cpu_features = 0;
+ _mesa_x86_cpu_features = 0x0;
+
+ if (_mesa_getenv( "MESA_NO_ASM")) {
+ return;
+ }
if (!_mesa_x86_has_cpuid()) {
_mesa_debug(NULL, "CPUID not detected\n");
_mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
cpu_vendor[12] = '\0';
- _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
+ if (detection_debug)
+ _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
/* get cpu features */
cpu_features = _mesa_x86_cpuid_edx(1);
_mesa_x86_cpuid(0x80000002+ofs, (GLuint *)(cpu_name + (16*ofs)+0), (GLuint *)(cpu_name + (16*ofs)+4), (GLuint *)(cpu_name + (16*ofs)+8), (GLuint *)(cpu_name + (16*ofs)+12));
cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */
- _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
+ if (detection_debug)
+ _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
}
}
}
-
- if ( _mesa_getenv( "MESA_NO_ASM" ) ) {
- _mesa_x86_cpu_features = 0;
- }
-
- if ( _mesa_x86_cpu_features ) {
- _mesa_init_x86_transform_asm();
- }
#ifdef USE_MMX_ASM
if ( cpu_has_mmx ) {
if ( _mesa_getenv( "MESA_NO_MMX" ) == 0 ) {
- _mesa_debug(NULL, "MMX cpu detected.\n");
+ if (detection_debug)
+ _mesa_debug(NULL, "MMX cpu detected.\n");
} else {
_mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
}
#ifdef USE_3DNOW_ASM
if ( cpu_has_3dnow ) {
if ( _mesa_getenv( "MESA_NO_3DNOW" ) == 0 ) {
- _mesa_debug(NULL, "3DNow! cpu detected.\n");
- _mesa_init_3dnow_transform_asm();
+ if (detection_debug)
+ _mesa_debug(NULL, "3DNow! cpu detected.\n");
} else {
_mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
}
#ifdef USE_SSE_ASM
if ( cpu_has_xmm ) {
if ( _mesa_getenv( "MESA_NO_SSE" ) == 0 ) {
- _mesa_debug(NULL, "SSE cpu detected.\n");
+ if (detection_debug)
+ _mesa_debug(NULL, "SSE cpu detected.\n");
if ( _mesa_getenv( "MESA_FORCE_SSE" ) == 0 ) {
- check_os_sse_support();
- }
- if ( cpu_has_xmm ) {
- _mesa_init_sse_transform_asm();
+ _mesa_check_os_sse_support();
}
} else {
_mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
}
}
#endif
-#endif
-}
+#endif /* USE_X86_ASM */
+
+ (void) detection_debug;
+}
projects / mesa.git / blobdiff