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/* $Id: asm_common_x86.s,v 1.1 2003-04-24 13:36:02 giacomo Exp $ *//** Mesa 3-D graphics library* Version: 4.0.3** Copyright (C) 1999-2002 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.*//** Check extended CPU capabilities. Now justs returns the raw CPUID* feature information, allowing the higher level code to interpret the* results.** Written by Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>** Cleaned up and simplified by Gareth Hughes <gareth@valinux.com>*//** NOTE: Avoid using spaces in between '(' ')' and arguments, especially* with macros like CONST, LLBL that expand to CONCAT(...). Putting spaces* in there will break the build on some platforms.*/#include "matypes.h"#include "features_common_x86.h"/* Intel vendor string*/#define GENU 0x756e6547 /* "Genu" */#define INEI 0x49656e69 /* "ineI" */#define NTEL 0x6c65746e /* "ntel" *//* AMD vendor string*/#define AUTH 0x68747541 /* "Auth" */#define ENTI 0x69746e65 /* "enti" */#define CAMD 0x444d4163 /* "cAMD" */SEG_DATA/* We might want to print out some useful messages.*/GLNAME( found_intel ): STRING( "Genuine Intel processor found\n\0" )GLNAME( found_amd ): STRING( "Authentic AMD processor found\n\0" )SEG_TEXTALIGNTEXT4GLOBL GLNAME( _mesa_identify_x86_cpu_features )GLNAME( _mesa_identify_x86_cpu_features ):PUSH_L ( EBX )PUSH_L ( ESI )/* Test for the CPUID command. If the ID Flag bit in EFLAGS* (bit 21) is writable, the CPUID command is present.*/PUSHF_LPOP_L ( EAX )MOV_L ( EAX, ECX )XOR_L ( CONST(0x00200000), EAX )PUSH_L ( EAX )POPF_LPUSHF_LPOP_L ( EAX )/* Verify the ID Flag bit has been written.*/CMP_L ( ECX, EAX )JZ ( LLBL (cpuid_done) )/* Get the CPU vendor info.*/XOR_L ( EAX, EAX )CPUID/* Test for Intel processors. We must look for the* "GenuineIntel" string in EBX, ECX and EDX.*/CMP_L ( CONST(GENU), EBX )JNE ( LLBL(cpuid_amd) )CMP_L ( CONST(INEI), EDX )JNE ( LLBL(cpuid_amd) )CMP_L ( CONST(NTEL), ECX )JNE ( LLBL(cpuid_amd) )/* We have an Intel processor, so we can get the feature* information with an CPUID input value of 1.*/MOV_L ( CONST(0x1), EAX )CPUIDMOV_L ( EDX, EAX )/* Mask out highest bit, which is used by AMD for 3dnow* Newer Intel have this bit set, but do not support 3dnow*/AND_L ( CONST(0X7FFFFFFF), EAX)JMP ( LLBL(cpuid_done) )LLBL(cpuid_amd):/* Test for AMD processors. We must look for the* "AuthenticAMD" string in EBX, ECX and EDX.*/CMP_L ( CONST(AUTH), EBX )JNE ( LLBL(cpuid_other) )CMP_L ( CONST(ENTI), EDX )JNE ( LLBL(cpuid_other) )CMP_L ( CONST(CAMD), ECX )JNE ( LLBL(cpuid_other) )/* We have an AMD processor, so we can get the feature* information after we verify that the extended functions are* supported.*//* The features we need are almost all in the extended set. The* exception is SSE enable, which is in the standard set (0x1).*/MOV_L ( CONST(0x1), EAX )CPUIDTEST_L ( EAX, EAX )JZ ( LLBL (cpuid_failed) )MOV_L ( EDX, ESI )MOV_L ( CONST(0x80000000), EAX )CPUIDTEST_L ( EAX, EAX )JZ ( LLBL (cpuid_failed) )MOV_L ( CONST(0x80000001), EAX )CPUIDMOV_L ( EDX, EAX )AND_L ( CONST(0x02000000), ESI ) /* OR in the SSE bit */OR_L ( ESI, EAX )JMP ( LLBL (cpuid_done) )LLBL(cpuid_other):/* Test for other processors here when required.*/LLBL(cpuid_failed):/* If we can't determine the feature information, we must* return zero to indicate that no platform-specific* optimizations can be used.*/MOV_L ( CONST(0), EAX )LLBL (cpuid_done):POP_L ( ESI )POP_L ( EBX )RET#ifdef USE_SSE_ASM/* Execute an SSE instruction to see if the operating system correctly* supports SSE. A signal handler for SIGILL should have been set* before calling this function, otherwise this could kill the client* application.*/ALIGNTEXT4GLOBL GLNAME( _mesa_test_os_sse_support )GLNAME( _mesa_test_os_sse_support ):XORPS ( XMM0, XMM0 )RET/* Perform an SSE divide-by-zero to see if the operating system* correctly supports unmasked SIMD FPU exceptions. Signal handlers for* SIGILL and SIGFPE should have been set before calling this function,* otherwise this could kill the client application.*/ALIGNTEXT4GLOBL GLNAME( _mesa_test_os_sse_exception_support )GLNAME( _mesa_test_os_sse_exception_support ):PUSH_L ( EBP )MOV_L ( ESP, EBP )SUB_L ( CONST( 8 ), ESP )/* Save the original MXCSR register value.*/STMXCSR ( REGOFF( -4, EBP ) )/* Unmask the divide-by-zero exception and perform one.*/STMXCSR ( REGOFF( -8, EBP ) )AND_L ( CONST( 0xfffffdff ), REGOFF( -8, EBP ) )LDMXCSR ( REGOFF( -8, EBP ) )XORPS ( XMM0, XMM0 )PUSH_L ( CONST( 0x3f800000 ) )PUSH_L ( CONST( 0x3f800000 ) )PUSH_L ( CONST( 0x3f800000 ) )PUSH_L ( CONST( 0x3f800000 ) )MOVUPS ( REGIND( ESP ), XMM1 )ADD_L ( CONST( 32 ), ESP )DIVPS ( XMM0, XMM1 )/* Restore the original MXCSR register value.*/LDMXCSR ( REGOFF( -4, EBP ) )LEAVERET#endif