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