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233 lines
7.9 KiB
233 lines
7.9 KiB
15 years ago
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/*
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Copyright (C) 2001 Malte Starostik <malte@kde.org>
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2001 Darian Lanx <bio@gmx.net>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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15 years ago
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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15 years ago
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*/
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#include <config.h>
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#include "startupmanager.h"
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#include "cpuinfo.h"
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#include <setjmp.h>
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#include <signal.h>
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using namespace Arts;
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int CpuInfo::s_flags = 0;
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namespace Arts
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{
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class CpuInfoStartup : public StartupClass
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{
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public:
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virtual void startup();
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private:
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static jmp_buf s_sseCheckEnv;
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static void sseCheckHandler(int);
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};
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}
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jmp_buf CpuInfoStartup::s_sseCheckEnv;
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void CpuInfoStartup::sseCheckHandler(int)
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{
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longjmp(s_sseCheckEnv, 1);
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}
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void CpuInfoStartup::startup()
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{
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#ifdef HAVE_X86_SSE
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/*
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* Taken with thanks from mmx.h:
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*
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* MultiMedia eXtensions GCC interface library for IA32.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR ANY PARTICULAR PURPOSE.
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*/
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/* Returns 1 if MMX instructions are supported,
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* 3 if Cyrix MMX and Extended MMX instructions are supported
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* 5 if AMD MMX and 3DNow! instructions are supported
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* 9 if MMX and Intel ISSE instructions are supported
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* 0 if hardware does not support any of these
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*/
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__asm__ __volatile__ (
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"pushl %%ebx \n\t"
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"pushl %%ecx \n\t"
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"pushl %%edx \n\t"
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// See if CPUID instruction is supported ...
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// ... Get copies of EFLAGS into eax and ecx
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"pushf \n\t"
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"popl %%eax \n\t"
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"movl %%eax, %%ecx \n\t"
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// ... Toggle the ID bit in one copy and store
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// to the EFLAGS reg
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"xorl $0x00200000, %%eax \n\t"
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"push %%eax \n\t"
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"popf \n\t"
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// ... Get the (hopefully modified) EFLAGS
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"pushf \n\t"
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"popl %%eax \n\t"
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// ... Compare and test result
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"xorl %%eax, %%ecx \n\t"
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"testl $0x00200000, %%ecx \n\t"
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"jz NotSupported \n\t"
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// Get standard CPUID information, and
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// go to a specific vendor section
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"movl $0, %%eax \n\t"
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"cpuid \n\t"
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// Check for Intel
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"cmpl $0x756e6547, %%ebx \n\t" // Genu
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"jne TryAMD \n\t"
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"cmpl $0x49656e69, %%edx \n\t" // ineI
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"jne TryAMD \n\t"
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"cmpl $0x6c65746e, %%ecx \n\t" // ntel
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"jne TryAMD \n\t"
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"jmp Intel \n\t"
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// Check for AMD
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"TryAMD: \n\t"
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"cmpl $0x68747541, %%ebx \n\t" // Auth
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"jne TryCyrix \n\t"
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"cmpl $0x69746e65, %%edx \n\t" // enti
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"jne TryCyrix \n\t"
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"cmpl $0x444d4163, %%ecx \n\t" // cAMD
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"jne TryCyrix \n\t"
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"jmp AMD \n\t"
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// Check for Cyrix
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"TryCyrix: \n\t"
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"cmpl $0x69727943, %%ebx \n\t" // Cyri
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"jne NotSupported \n\t"
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"cmpl $0x736e4978, %%edx \n\t" // xIns
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"jne NotSupported \n\t"
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"cmpl $0x64616574, %%ecx \n\t" // tead
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"jne NotSupported \n\t"
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// Drop through to Cyrix...
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// Cyrix Section
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// See if extended CPUID is supported
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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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"jl MMXtest \n\t" // try std CPUID
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// Extended CPUID supported, so get extended features
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"movl $0x80000001, %%eax \n\t"
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"cpuid \n\t"
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"testl $0x00800000, %%eax \n\t" // test for MMX
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"jz NotSupported \n\t" // no MMX
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"movl $1, %0 \n\t" // has MMX
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"testl $0x01000000, %%eax \n\t" // test for EMMX
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"jz Return \n\t" // no EMMX
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"addl $2, %0 \n\t" // has EMMX
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"jmp Return \n\t"
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// AMD Section
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"AMD: \n\t"
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// See if extended CPUID is supported
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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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"jl MMXtest \n\t" // try std CPUID
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// Extended CPUID supported, so get extended features
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"movl $0x80000001, %%eax \n\t"
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"cpuid \n\t"
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"testl $0x00800000, %%edx \n\t" // test for MMX
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"jz NotSupported \n\t" // no MMX
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"movl $1, %0 \n\t" // has MMX
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"testl $0x80000000, %%edx \n\t" // test for 3DNow!
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"jz Return \n\t"
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"addl $4, %0 \n\t" // has 3DNow!
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// Athlon(tm) XP has both 3DNow! and SSE
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"pushl %%eax \n\t"
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"movl $1, %%eax \n\t"
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"cpuid \n\t"
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"popl %%eax \n\t"
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"testl $0x02000000, %%edx \n\t" // test for SSE
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"jz Return \n\t" // no SSE
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"addl $8, %0 \n\t" // has SSE
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"jmp Return \n\t"
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// Intel Section
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"Intel: \n\t"
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// Check for MMX
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"MMXtest: \n\t"
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"movl $1, %%eax \n\t"
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"cpuid \n\t"
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"testl $0x00800000, %%edx \n\t" // test for MMX
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"jz NotSupported \n\t" // no MMX
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"movl $1, %0 \n\t" // has MMX
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"testl $0x02000000, %%edx \n\t" // test for SSE
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"jz Return \n\t" // no SSE
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"addl $8, %0 \n\t" // has SSE
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"jmp Return \n\t"
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// Nothing supported
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"NotSupported: \n\t"
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"movl $0, %0 \n\t"
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"Return: \n\t"
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"popl %%edx \n\t"
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"popl %%ecx \n\t"
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"popl %%ebx \n\t"
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: "=a" (CpuInfo::s_flags)
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: /* no input */
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: "memory"
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);
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// SSE must be supported by the OS, if it's not, any SSE insn will
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// trigger an invalid opcode exception, to check for this, a SIGILL
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// handler is installed and a SSE insn run. If the handler is called,
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// the SSE bit is cleared in CpuInfo::s_flags
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if (CpuInfo::s_flags & CpuInfo::CpuSSE)
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{
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void (*oldHandler)(int) = signal(SIGILL, sseCheckHandler);
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if (setjmp(s_sseCheckEnv))
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{
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CpuInfo::s_flags &= ~CpuInfo::CpuSSE;
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}
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else
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{
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__asm__ __volatile__ (
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"subl $0x10, %esp \n"
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"movups %xmm0, (%esp) \n"
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"emms \n"
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"addl $0x10, %esp \n"
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);
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}
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signal(SIGILL, oldHandler);
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}
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#endif /* HAVE_X86_SSE */
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}
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static CpuInfoStartup cpuInfoStartup;
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