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/*

 * 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 

 * \author Andre Werthmann 

 */

/* XXX these includes should probably go into imports.h or glheader.h */

#if defined(USE_SSE_ASM) && defined(__linux__)

#include 

#endif

#if defined(USE_SSE_ASM) && defined(__FreeBSD__)

#include 

#include 

#endif

#if defined(USE_SSE_ASM) && defined(__OpenBSD__)

#include 

#include 

#include 

#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;

}