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Diffstat (limited to 'flow/cpuinfo.cpp')
| -rw-r--r-- | flow/cpuinfo.cpp | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/flow/cpuinfo.cpp b/flow/cpuinfo.cpp new file mode 100644 index 0000000..5c9ec67 --- /dev/null +++ b/flow/cpuinfo.cpp @@ -0,0 +1,232 @@ + /* + + Copyright (C) 2001 Malte Starostik <[email protected]> + 2001 Darian Lanx <[email protected]> + + 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 <config.h> +#include "startupmanager.h" +#include "cpuinfo.h" + +#include <setjmp.h> +#include <signal.h> + +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; |