212 lines
7.1 KiB
C++
212 lines
7.1 KiB
C++
/***************************************************************************
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kcpuinfo.cpp
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(c) 2000-2017 Benoît Minisini <g4mba5@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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***************************************************************************/
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/*
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* This file is part of the KDE libraries
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* Copyright (C) 2003 Fredrik H<>glund <fredrik@kde.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <csignal>
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#include <csetjmp>
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#include <config.h>
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#include "kcpuinfo.h"
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#if defined(__GNUC__) || defined(__INTEL_COMPILER)
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# define HAVE_GNU_INLINE_ASM
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#endif
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/*
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// Copied from kdecore/kglobal.h
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#if __GNUC__ - 0 > 3 || (__GNUC__ - 0 == 3 && __GNUC_MINOR__ - 0 > 2)
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# define KDE_NO_EXPORT __attribute__ ((visibility("hidden")))
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#else
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# define KDE_NO_EXPORT
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#endif
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*/
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#define KDE_NO_EXPORT
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typedef void (*kde_sighandler_t) (int);
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/*
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#ifdef __i386__
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static jmp_buf KDE_NO_EXPORT env;
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// Sighandler for the SSE OS support check
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static void KDE_NO_EXPORT sighandler( int )
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{
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std::longjmp( env, 1 );
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}
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#endif
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#ifdef __PPC__
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static sigjmp_buf KDE_NO_EXPORT jmpbuf;
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static sig_atomic_t KDE_NO_EXPORT canjump = 0;
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static void KDE_NO_EXPORT sigill_handler( int sig )
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{
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if ( !canjump ) {
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signal( sig, SIG_DFL );
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raise( sig );
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}
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canjump = 0;
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siglongjmp( jmpbuf, 1 );
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}
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#endif
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*/
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static int KDE_NO_EXPORT getCpuFeatures()
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{
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int features = 0;
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#if defined( HAVE_GNU_INLINE_ASM )
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#if defined( __i386__ )
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bool haveCPUID = false;
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bool have3DNOW = false;
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int result = 0;
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// First check if the CPU supports the CPUID instruction
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__asm__ __volatile__(
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// Try to toggle the CPUID bit in the EFLAGS register
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"pushf \n\t" // Push the EFLAGS register onto the stack
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"popl %%ecx \n\t" // Pop the value into ECX
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"movl %%ecx, %%edx \n\t" // Copy ECX to EDX
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"xorl $0x00200000, %%ecx \n\t" // Toggle bit 21 (CPUID) in ECX
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"pushl %%ecx \n\t" // Push the modified value onto the stack
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"popf \n\t" // Pop it back into EFLAGS
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// Check if the CPUID bit was successfully toggled
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"pushf \n\t" // Push EFLAGS back onto the stack
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"popl %%ecx \n\t" // Pop the value into ECX
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"xorl %%eax, %%eax \n\t" // Zero out the EAX register
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"cmpl %%ecx, %%edx \n\t" // Compare ECX with EDX
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"je .Lno_cpuid_support%= \n\t" // Jump if they're identical
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"movl $1, %%eax \n\t" // Set EAX to true
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".Lno_cpuid_support%=: \n\t"
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: "=a"(haveCPUID) : : "%ecx", "%edx" );
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// If we don't have CPUID we won't have the other extensions either
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if ( ! haveCPUID )
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return 0L;
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// Execute CPUID with the feature request bit set
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__asm__ __volatile__(
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"pushl %%ebx \n\t" // Save EBX
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"movl $1, %%eax \n\t" // Set EAX to 1 (features request)
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"cpuid \n\t" // Call CPUID
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"popl %%ebx \n\t" // Restore EBX
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: "=d"(result) : : "%eax", "%ecx" );
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// Test bit 23 (MMX support)
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if ( result & 0x00800000 )
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features |= KCPUInfo::IntelMMX;
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__asm__ __volatile__(
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"pushl %%ebx \n\t"
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"movl $0x80000000, %%eax \n\t"
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"cpuid \n\t"
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"cmpl $0x80000000, %%eax \n\t"
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"jbe .Lno_extended%= \n\t"
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"movl $0x80000001, %%eax \n\t"
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"cpuid \n\t"
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"test $0x80000000, %%edx \n\t"
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"jz .Lno_extended%= \n\t"
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"movl $1, %%eax \n\t" // // Set EAX to true
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".Lno_extended%=: \n\t"
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"popl %%ebx \n\t" // Restore EBX
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: "=a"(have3DNOW) : );
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if ( have3DNOW )
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features |= KCPUInfo::AMD3DNOW;
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#ifdef HAVE_X86_SSE
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// Test bit 25 (SSE support)
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if ( result & 0x00200000 ) {
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features |= KCPUInfo::IntelSSE;
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// OS support test for SSE.
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// Install our own sighandler for SIGILL.
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kde_sighandler_t oldhandler = std::signal( SIGILL, sighandler );
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// Try executing an SSE insn to see if we get a SIGILL
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if ( setjmp( env ) )
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features ^= KCPUInfo::IntelSSE; // The OS support test failed
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else
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__asm__ __volatile__("xorps %xmm0, %xmm0");
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// Restore the default sighandler
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std::signal( SIGILL, oldhandler );
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// Test bit 26 (SSE2 support)
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if ( (result & 0x00400000) && (features & KCPUInfo::IntelSSE) )
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features |= KCPUInfo::IntelSSE2;
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// Note: The OS requirements for SSE2 are the same as for SSE
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// so we don't have to do any additional tests for that.
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}
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#endif // HAVE_X86_SSE
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#elif defined __PPC__ && defined HAVE_PPC_ALTIVEC
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signal( SIGILL, sigill_handler );
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if ( sigsetjmp( jmpbuf, 1 ) ) {
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signal( SIGILL, SIG_DFL );
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} else {
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canjump = 1;
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__asm__ __volatile__( "mtspr 256, %0\n\t"
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"vand %%v0, %%v0, %%v0"
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: /* none */
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: "r" (-1) );
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signal( SIGILL, SIG_DFL );
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features |= KCPUInfo::AltiVec;
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}
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#endif // __i386__
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#endif //HAVE_GNU_INLINE_ASM
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return features;
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}
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unsigned int KCPUInfo::s_features = getCpuFeatures();
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