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318 lines
8.8 KiB
C
318 lines
8.8 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5.1
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file common_x86.c
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*
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* Check CPU capabilities & initialize optimized funtions for this particular
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* processor.
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*
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* Changed by Andre Werthmann for using the new SSE functions.
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*
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* \author Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
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* \author Andre Werthmann <wertmann@cs.uni-potsdam.de>
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*/
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/* XXX these includes should probably go into imports.h or glheader.h */
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#if defined(USE_SSE_ASM) && defined(__linux__)
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#include <linux/version.h>
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#endif
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#if defined(USE_SSE_ASM) && defined(__FreeBSD__)
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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#if defined(USE_SSE_ASM) && defined(__OpenBSD__)
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#endif
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#include "main/imports.h"
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#include "common_x86_asm.h"
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#include <pseh/pseh2.h>
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/** Bitmask of X86_FEATURE_x bits */
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int _mesa_x86_cpu_features = 0x0;
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static int detection_debug = GL_FALSE;
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/* No reason for this to be public.
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*/
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extern GLuint _ASMAPI _mesa_x86_has_cpuid(void);
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extern void _ASMAPI _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx);
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extern GLuint _ASMAPI _mesa_x86_cpuid_eax(GLuint op);
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extern GLuint _ASMAPI _mesa_x86_cpuid_ebx(GLuint op);
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extern GLuint _ASMAPI _mesa_x86_cpuid_ecx(GLuint op);
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extern GLuint _ASMAPI _mesa_x86_cpuid_edx(GLuint op);
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#if defined(USE_SSE_ASM)
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/*
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* We must verify that the Streaming SIMD Extensions are truly supported
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* on this processor before we go ahead and hook out the optimized code.
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*
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* However, I have been told by Alan Cox that all 2.4 (and later) Linux
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* kernels provide full SSE support on all processors that expose SSE via
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* the CPUID mechanism.
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*/
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/* These are assembly functions: */
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extern void _mesa_test_os_sse_support( void );
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extern void _mesa_test_os_sse_exception_support( void );
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/**
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* Check if SSE is supported.
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* If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features.
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*/
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void _mesa_check_os_sse_support( void )
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{
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#if defined(__FreeBSD__)
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{
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int ret, enabled;
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unsigned int len;
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len = sizeof(enabled);
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ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0);
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if (ret || !enabled)
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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#elif defined (__NetBSD__)
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{
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int ret, enabled;
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size_t len = sizeof(enabled);
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ret = sysctlbyname("machdep.sse", &enabled, &len, (void *)NULL, 0);
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if (ret || !enabled)
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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#elif defined(__OpenBSD__)
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{
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int mib[2];
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int ret, enabled;
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size_t len = sizeof(enabled);
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_SSE;
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ret = sysctl(mib, 2, &enabled, &len, NULL, 0);
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if (ret || !enabled)
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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#elif defined(WIN32)
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if ( cpu_has_xmm ) {
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_mesa_debug(NULL, "Testing OS support for SSE...\n");
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_SEH2_TRY
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{
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_mesa_test_os_sse_support();
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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if(_SEH2_GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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_SEH2_END;
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if ( cpu_has_xmm ) {
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_mesa_debug(NULL, "Yes.\n");
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} else {
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_mesa_debug(NULL, "No!\n");
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}
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}
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if ( cpu_has_xmm ) {
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_mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");
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_SEH2_TRY
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{
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_mesa_test_os_sse_exception_support();
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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if(_SEH2_GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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_SEH2_END;
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if ( cpu_has_xmm ) {
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_mesa_debug(NULL, "Yes.\n");
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} else {
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_mesa_debug(NULL, "No!\n");
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}
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}
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if ( cpu_has_xmm ) {
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_mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
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} else {
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_mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
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}
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#else
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/* Do nothing on other platforms for now.
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*/
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if (detection_debug)
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_mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
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#endif /* __FreeBSD__ */
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}
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#endif /* USE_SSE_ASM */
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/**
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* Initialize the _mesa_x86_cpu_features bitfield.
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* This is a no-op if called more than once.
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*/
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void
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_mesa_get_x86_features(void)
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{
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static int called = 0;
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if (called)
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return;
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called = 1;
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#ifdef USE_X86_ASM
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_mesa_x86_cpu_features = 0x0;
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if (_mesa_getenv( "MESA_NO_ASM")) {
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return;
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}
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if (!_mesa_x86_has_cpuid()) {
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_mesa_debug(NULL, "CPUID not detected\n");
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}
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else {
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GLuint cpu_features;
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GLuint cpu_ext_features;
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GLuint cpu_ext_info;
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char cpu_vendor[13];
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GLuint result;
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/* get vendor name */
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_mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
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cpu_vendor[12] = '\0';
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if (detection_debug)
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_mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
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/* get cpu features */
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cpu_features = _mesa_x86_cpuid_edx(1);
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if (cpu_features & X86_CPU_FPU)
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_mesa_x86_cpu_features |= X86_FEATURE_FPU;
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if (cpu_features & X86_CPU_CMOV)
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_mesa_x86_cpu_features |= X86_FEATURE_CMOV;
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#ifdef USE_MMX_ASM
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if (cpu_features & X86_CPU_MMX)
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_mesa_x86_cpu_features |= X86_FEATURE_MMX;
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#endif
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#ifdef USE_SSE_ASM
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if (cpu_features & X86_CPU_XMM)
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_mesa_x86_cpu_features |= X86_FEATURE_XMM;
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if (cpu_features & X86_CPU_XMM2)
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_mesa_x86_cpu_features |= X86_FEATURE_XMM2;
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#endif
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/* query extended cpu features */
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if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) {
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if (cpu_ext_info >= 0x80000001) {
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cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001);
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if (cpu_features & X86_CPU_MMX) {
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#ifdef USE_3DNOW_ASM
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if (cpu_ext_features & X86_CPUEXT_3DNOW)
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_mesa_x86_cpu_features |= X86_FEATURE_3DNOW;
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if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT)
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_mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT;
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#endif
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#ifdef USE_MMX_ASM
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if (cpu_ext_features & X86_CPUEXT_MMX_EXT)
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_mesa_x86_cpu_features |= X86_FEATURE_MMXEXT;
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#endif
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}
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}
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/* query cpu name */
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if (cpu_ext_info >= 0x80000002) {
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GLuint ofs;
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char cpu_name[49];
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for (ofs = 0; ofs < 3; ofs++)
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_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));
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cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */
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if (detection_debug)
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_mesa_debug(NULL, "CPU name: %s\n", cpu_name);
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}
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}
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}
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#ifdef USE_MMX_ASM
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if ( cpu_has_mmx ) {
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if ( _mesa_getenv( "MESA_NO_MMX" ) == 0 ) {
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if (detection_debug)
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_mesa_debug(NULL, "MMX cpu detected.\n");
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} else {
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_mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
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}
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}
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#endif
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#ifdef USE_3DNOW_ASM
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if ( cpu_has_3dnow ) {
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if ( _mesa_getenv( "MESA_NO_3DNOW" ) == 0 ) {
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if (detection_debug)
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_mesa_debug(NULL, "3DNow! cpu detected.\n");
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} else {
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_mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
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}
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}
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#endif
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#ifdef USE_SSE_ASM
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if ( cpu_has_xmm ) {
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if ( _mesa_getenv( "MESA_NO_SSE" ) == 0 ) {
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if (detection_debug)
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_mesa_debug(NULL, "SSE cpu detected.\n");
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if ( _mesa_getenv( "MESA_FORCE_SSE" ) == 0 ) {
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_mesa_check_os_sse_support();
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}
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} else {
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_mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
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_mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
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}
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}
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#endif
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#endif /* USE_X86_ASM */
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(void) detection_debug;
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}
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