0,0 → 1,336 |
/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the "Software"), |
* to deal in the Software without restriction, including without limitation |
* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
* and/or sell copies of the Software, and to permit persons to whom the |
* Software is furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice shall be included |
* in all copies or substantial portions of the Software. |
* |
* 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 |
* 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. |
*/ |
|
/** |
* \file common_x86.c |
* |
* Check CPU capabilities & initialize optimized funtions for this particular |
* processor. |
* |
* Changed by Andre Werthmann for using the new SSE functions. |
* |
* \author Holger Waechtler <holger@akaflieg.extern.tu-berlin.de> |
* \author Andre Werthmann <wertmann@cs.uni-potsdam.de> |
*/ |
|
/* XXX these includes should probably go into imports.h or glheader.h */ |
#if defined(USE_SSE_ASM) && defined(__linux__) |
#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" |
|
|
/** 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. |
*/ |
extern GLuint _ASMAPI _mesa_x86_has_cpuid(void); |
extern void _ASMAPI _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx); |
extern GLuint _ASMAPI _mesa_x86_cpuid_eax(GLuint op); |
extern GLuint _ASMAPI _mesa_x86_cpuid_ebx(GLuint op); |
extern GLuint _ASMAPI _mesa_x86_cpuid_ecx(GLuint op); |
extern GLuint _ASMAPI _mesa_x86_cpuid_edx(GLuint op); |
|
|
#if defined(USE_SSE_ASM) |
/* |
* We must verify that the Streaming SIMD Extensions are truly supported |
* on this processor before we go ahead and hook out the optimized code. |
* |
* 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. |
*/ |
|
/* These are assembly functions: */ |
extern void _mesa_test_os_sse_support( void ); |
extern void _mesa_test_os_sse_exception_support( void ); |
|
|
#if defined(_WIN32) |
#ifndef STATUS_FLOAT_MULTIPLE_TRAPS |
# define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L) |
#endif |
static LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS exp) |
{ |
PEXCEPTION_RECORD rec = exp->ExceptionRecord; |
PCONTEXT ctx = exp->ContextRecord; |
|
if ( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION ) { |
_mesa_debug(NULL, "EXCEPTION_ILLEGAL_INSTRUCTION\n" ); |
_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM); |
} else if ( rec->ExceptionCode == STATUS_FLOAT_MULTIPLE_TRAPS ) { |
_mesa_debug(NULL, "STATUS_FLOAT_MULTIPLE_TRAPS\n"); |
/* Windows seems to clear the exception flag itself, we just have to increment Eip */ |
} else { |
_mesa_debug(NULL, "UNEXPECTED EXCEPTION (0x%08x), terminating!\n" ); |
return EXCEPTION_EXECUTE_HANDLER; |
} |
|
if ( (ctx->ContextFlags & CONTEXT_CONTROL) != CONTEXT_CONTROL ) { |
_mesa_debug(NULL, "Context does not contain control registers, terminating!\n"); |
return EXCEPTION_EXECUTE_HANDLER; |
} |
ctx->Eip += 3; |
|
return EXCEPTION_CONTINUE_EXECUTION; |
} |
#endif /* _WIN32 */ |
|
|
/** |
* Check if SSE is supported. |
* If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features. |
*/ |
void _mesa_check_os_sse_support( void ) |
{ |
#if defined(__FreeBSD__) |
{ |
int ret, enabled; |
unsigned int len; |
len = sizeof(enabled); |
ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0); |
if (ret || !enabled) |
_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM); |
} |
#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 */ |
oldFilter = SetUnhandledExceptionFilter( ExceptionFilter ); |
|
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"); |
} |
} |
|
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 previous exception filter */ |
SetUnhandledExceptionFilter( oldFilter ); |
|
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 |
/* Do nothing on other platforms for now. |
*/ |
if (detection_debug) |
_mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n"); |
#endif /* __FreeBSD__ */ |
} |
|
#endif /* USE_SSE_ASM */ |
|
|
/** |
* 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 = 0x0; |
|
if (_mesa_getenv( "MESA_NO_ASM")) { |
return; |
} |
|
if (!_mesa_x86_has_cpuid()) { |
_mesa_debug(NULL, "CPUID not detected\n"); |
} |
else { |
GLuint cpu_features; |
GLuint cpu_ext_features; |
GLuint cpu_ext_info; |
char cpu_vendor[13]; |
GLuint result; |
|
/* get vendor name */ |
_mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4)); |
cpu_vendor[12] = '\0'; |
|
if (detection_debug) |
_mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor); |
|
/* get cpu features */ |
cpu_features = _mesa_x86_cpuid_edx(1); |
|
if (cpu_features & X86_CPU_FPU) |
_mesa_x86_cpu_features |= X86_FEATURE_FPU; |
if (cpu_features & X86_CPU_CMOV) |
_mesa_x86_cpu_features |= X86_FEATURE_CMOV; |
|
#ifdef USE_MMX_ASM |
if (cpu_features & X86_CPU_MMX) |
_mesa_x86_cpu_features |= X86_FEATURE_MMX; |
#endif |
|
#ifdef USE_SSE_ASM |
if (cpu_features & X86_CPU_XMM) |
_mesa_x86_cpu_features |= X86_FEATURE_XMM; |
if (cpu_features & X86_CPU_XMM2) |
_mesa_x86_cpu_features |= X86_FEATURE_XMM2; |
#endif |
|
/* query extended cpu features */ |
if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) { |
if (cpu_ext_info >= 0x80000001) { |
|
cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001); |
|
if (cpu_features & X86_CPU_MMX) { |
|
#ifdef USE_3DNOW_ASM |
if (cpu_ext_features & X86_CPUEXT_3DNOW) |
_mesa_x86_cpu_features |= X86_FEATURE_3DNOW; |
if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT) |
_mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT; |
#endif |
|
#ifdef USE_MMX_ASM |
if (cpu_ext_features & X86_CPUEXT_MMX_EXT) |
_mesa_x86_cpu_features |= X86_FEATURE_MMXEXT; |
#endif |
} |
} |
|
/* query cpu name */ |
if (cpu_ext_info >= 0x80000002) { |
GLuint ofs; |
char cpu_name[49]; |
for (ofs = 0; ofs < 3; ofs++) |
_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 */ |
|
if (detection_debug) |
_mesa_debug(NULL, "CPU name: %s\n", cpu_name); |
} |
} |
|
} |
|
#ifdef USE_MMX_ASM |
if ( cpu_has_mmx ) { |
if ( _mesa_getenv( "MESA_NO_MMX" ) == 0 ) { |
if (detection_debug) |
_mesa_debug(NULL, "MMX cpu detected.\n"); |
} else { |
_mesa_x86_cpu_features &= ~(X86_FEATURE_MMX); |
} |
} |
#endif |
|
#ifdef USE_3DNOW_ASM |
if ( cpu_has_3dnow ) { |
if ( _mesa_getenv( "MESA_NO_3DNOW" ) == 0 ) { |
if (detection_debug) |
_mesa_debug(NULL, "3DNow! cpu detected.\n"); |
} else { |
_mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW); |
} |
} |
#endif |
|
#ifdef USE_SSE_ASM |
if ( cpu_has_xmm ) { |
if ( _mesa_getenv( "MESA_NO_SSE" ) == 0 ) { |
if (detection_debug) |
_mesa_debug(NULL, "SSE cpu detected.\n"); |
if ( _mesa_getenv( "MESA_FORCE_SSE" ) == 0 ) { |
_mesa_check_os_sse_support(); |
} |
} else { |
_mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n"); |
_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM); |
} |
} |
#endif |
|
#endif /* USE_X86_ASM */ |
|
(void) detection_debug; |
} |