/*
* Mesa 3-D graphics library
* Version: 6.5.1
*
* 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
* BRIAN PAUL 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;
}