diff options
Diffstat (limited to 'src/gallium/auxiliary/util/u_cpu_detect.c')
| -rw-r--r-- | src/gallium/auxiliary/util/u_cpu_detect.c | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_cpu_detect.c b/src/gallium/auxiliary/util/u_cpu_detect.c new file mode 100644 index 0000000000..d9f2f8fc28 --- /dev/null +++ b/src/gallium/auxiliary/util/u_cpu_detect.c @@ -0,0 +1,506 @@ +/************************************************************************** + * + * Copyright 2008 Dennis Smit + * 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 + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, 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 (including the next + * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL + * AUTHORS, COPYRIGHT HOLDERS, AND/OR THEIR SUPPLIERS 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. + * + **************************************************************************/ + +/* + * Based on the work of Eric Anholt <anholt@FreeBSD.org> + */ + +/* FIXME: clean this entire file up */ + +#include "u_cpu_detect.h" + +#ifdef __linux__ +#define OS_LINUX +#endif +#ifdef WIN32 +#define OS_WIN32 +#endif + +#if defined(ARCH_POWERPC) +#if defined(OS_DARWIN) +#include <sys/sysctl.h> +#else +#include <signal.h> +#include <setjmp.h> +#endif +#endif + +#if defined(OS_NETBSD) || defined(OS_OPENBSD) +#include <sys/param.h> +#include <sys/sysctl.h> +#include <machine/cpu.h> +#endif + +#if defined(OS_FREEBSD) +#include <sys/types.h> +#include <sys/sysctl.h> +#endif + +#if defined(OS_LINUX) +#include <signal.h> +#endif + +#if defined(OS_WIN32) +#include <windows.h> +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + + +static struct cpu_detect_caps __cpu_detect_caps; +static int __cpu_detect_initialized = 0; + +static int has_cpuid(void); +static int cpuid(unsigned int ax, unsigned int *p); + +/* The sigill handlers */ +#if defined(ARCH_X86) /* x86 (linux katmai handler check thing) */ +#if defined(OS_LINUX) && defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC) +static void sigill_handler_sse(int signal, struct sigcontext sc) +{ + /* Both the "xorps %%xmm0,%%xmm0" and "divps %xmm0,%%xmm1" + * instructions are 3 bytes long. We must increment the instruction + * pointer manually to avoid repeated execution of the offending + * instruction. + * + * If the SIGILL is caused by a divide-by-zero when unmasked + * exceptions aren't supported, the SIMD FPU status and control + * word will be restored at the end of the test, so we don't need + * to worry about doing it here. Besides, we may not be able to... + */ + sc.eip += 3; + + __cpu_detect_caps.hasSSE=0; +} + +static void sigfpe_handler_sse(int signal, struct sigcontext sc) +{ + if (sc.fpstate->magic != 0xffff) { + /* Our signal context has the extended FPU state, so reset the + * divide-by-zero exception mask and clear the divide-by-zero + * exception bit. + */ + sc.fpstate->mxcsr |= 0x00000200; + sc.fpstate->mxcsr &= 0xfffffffb; + } else { + /* If we ever get here, we're completely hosed. + */ + } +} +#endif +#endif /* OS_LINUX && _POSIX_SOURCE && X86_FXSR_MAGIC */ + +#if defined(OS_WIN32) +LONG CALLBACK win32_sig_handler_sse(EXCEPTION_POINTERS* ep) +{ + if(ep->ExceptionRecord->ExceptionCode==EXCEPTION_ILLEGAL_INSTRUCTION){ + ep->ContextRecord->Eip +=3; + __cpu_detect_caps.hasSSE=0; + return EXCEPTION_CONTINUE_EXECUTION; + } + return EXCEPTION_CONTINUE_SEARCH; +} +#endif /* OS_WIN32 */ + + +#if defined(ARCH_POWERPC) && !defined(OS_DARWIN) +static sigjmp_buf __lv_powerpc_jmpbuf; +static volatile sig_atomic_t __lv_powerpc_canjump = 0; + +static void sigill_handler (int sig); + +static void sigill_handler (int sig) +{ + if (!__lv_powerpc_canjump) { + signal (sig, SIG_DFL); + raise (sig); + } + + __lv_powerpc_canjump = 0; + siglongjmp(__lv_powerpc_jmpbuf, 1); +} + +static void check_os_altivec_support(void) +{ +#if defined(OS_DARWIN) + int sels[2] = {CTL_HW, HW_VECTORUNIT}; + int has_vu = 0; + int len = sizeof (has_vu); + int err; + + err = sysctl(sels, 2, &has_vu, &len, NULL, 0); + + if (err == 0) { + if (has_vu != 0) { + __cpu_detect_caps.hasAltiVec = 1; + } + } +#else /* !OS_DARWIN */ + /* no Darwin, do it the brute-force way */ + /* this is borrowed from the libmpeg2 library */ + signal(SIGILL, sigill_handler); + if (sigsetjmp(__lv_powerpc_jmpbuf, 1)) { + signal(SIGILL, SIG_DFL); + } else { + __lv_powerpc_canjump = 1; + + __asm __volatile + ("mtspr 256, %0\n\t" + "vand %%v0, %%v0, %%v0" + : + : "r" (-1)); + + signal(SIGILL, SIG_DFL); + __cpu_detect_caps.hasAltiVec = 1; + } +#endif +} +#endif + +/* If we're running on a processor that can do SSE, let's see if we + * are allowed to or not. This will catch 2.4.0 or later kernels that + * haven't been configured for a Pentium III but are running on one, + * and RedHat patched 2.2 kernels that have broken exception handling + * support for user space apps that do SSE. + */ +static void check_os_katmai_support(void) +{ +#if defined(ARCH_X86) +#if defined(OS_FREEBSD) + int has_sse=0, ret; + int len = sizeof (has_sse); + + ret = sysctlbyname("hw.instruction_sse", &has_sse, &len, NULL, 0); + if (ret || !has_sse) + __cpu_detect_caps.hasSSE=0; + +#elif defined(OS_NETBSD) || defined(OS_OPENBSD) + int has_sse, has_sse2, ret, mib[2]; + int varlen; + + mib[0] = CTL_MACHDEP; + mib[1] = CPU_SSE; + varlen = sizeof (has_sse); + + ret = sysctl(mib, 2, &has_sse, &varlen, NULL, 0); + if (ret < 0 || !has_sse) { + __cpu_detect_caps.hasSSE = 0; + } else { + __cpu_detect_caps.hasSSE = 1; + } + + mib[1] = CPU_SSE2; + varlen = sizeof (has_sse2); + ret = sysctl(mib, 2, &has_sse2, &varlen, NULL, 0); + if (ret < 0 || !has_sse2) { + __cpu_detect_caps.hasSSE2 = 0; + } else { + __cpu_detect_caps.hasSSE2 = 1; + } + __cpu_detect_caps.hasSSE = 0; /* FIXME ?!?!? */ + +#elif defined(OS_WIN32) + LPTOP_LEVEL_EXCEPTION_FILTER exc_fil; + if (__cpu_detect_caps.hasSSE) { + exc_fil = SetUnhandledExceptionFilter(win32_sig_handler_sse); + __asm __volatile ("xorps %xmm0, %xmm0"); + SetUnhandledExceptionFilter(exc_fil); + } +#elif defined(OS_LINUX) + struct sigaction saved_sigill; + struct sigaction saved_sigfpe; + + /* Save the original signal handlers. + */ + sigaction(SIGILL, NULL, &saved_sigill); + sigaction(SIGFPE, NULL, &saved_sigfpe); + + signal(SIGILL, (void (*)(int))sigill_handler_sse); + signal(SIGFPE, (void (*)(int))sigfpe_handler_sse); + + /* Emulate test for OSFXSR in CR4. The OS will set this bit if it + * supports the extended FPU save and restore required for SSE. If + * we execute an SSE instruction on a PIII and get a SIGILL, the OS + * doesn't support Streaming SIMD Exceptions, even if the processor + * does. + */ + if (__cpu_detect_caps.hasSSE) { + __asm __volatile ("xorps %xmm1, %xmm0"); + } + + /* Emulate test for OSXMMEXCPT in CR4. The OS will set this bit if + * it supports unmasked SIMD FPU exceptions. If we unmask the + * exceptions, do a SIMD divide-by-zero and get a SIGILL, the OS + * doesn't support unmasked SIMD FPU exceptions. If we get a SIGFPE + * as expected, we're okay but we need to clean up after it. + * + * Are we being too stringent in our requirement that the OS support + * unmasked exceptions? Certain RedHat 2.2 kernels enable SSE by + * setting CR4.OSFXSR but don't support unmasked exceptions. Win98 + * doesn't even support them. We at least know the user-space SSE + * support is good in kernels that do support unmasked exceptions, + * and therefore to be safe I'm going to leave this test in here. + */ + if (__cpu_detect_caps.hasSSE) { + // test_os_katmai_exception_support(); + } + + /* Restore the original signal handlers. + */ + sigaction(SIGILL, &saved_sigill, NULL); + sigaction(SIGFPE, &saved_sigfpe, NULL); + +#else + /* We can't use POSIX signal handling to test the availability of + * SSE, so we disable it by default. + */ + __cpu_detect_caps.hasSSE = 0; +#endif /* __linux__ */ +#endif +} + + +static int has_cpuid(void) +{ +#if defined(ARCH_X86) + int a, c; + + __asm __volatile + ("pushf\n" + "popl %0\n" + "movl %0, %1\n" + "xorl $0x200000, %0\n" + "push %0\n" + "popf\n" + "pushf\n" + "popl %0\n" + : "=a" (a), "=c" (c) + : + : "cc"); + + return a != c; +#else + return 0; +#endif +} + +static int cpuid(unsigned int ax, unsigned int *p) +{ +#if defined(ARCH_X86) + unsigned int flags; + + __asm __volatile + ("movl %%ebx, %%esi\n\t" + "cpuid\n\t" + "xchgl %%ebx, %%esi" + : "=a" (p[0]), "=S" (p[1]), + "=c" (p[2]), "=d" (p[3]) + : "0" (ax)); + + return 0; +#else + return -1; +#endif +} + +void cpu_detect_initialize() +{ + unsigned int regs[4]; + unsigned int regs2[4]; + + int mib[2], ncpu; + int len; + + memset(&__cpu_detect_caps, 0, sizeof (struct cpu_detect_caps)); + + /* Check for arch type */ +#if defined(ARCH_MIPS) + __cpu_detect_caps.type = CPU_DETECT_TYPE_MIPS; +#elif defined(ARCH_ALPHA) + __cpu_detect_caps.type = CPU_DETECT_TYPE_ALPHA; +#elif defined(ARCH_SPARC) + __cpu_detect_caps.type = CPU_DETECT_TYPE_SPARC; +#elif defined(ARCH_X86) + __cpu_detect_caps.type = CPU_DETECT_TYPE_X86; +#elif defined(ARCH_POWERPC) + __cpu_detect_caps.type = CPU_DETECT_TYPE_POWERPC; +#else + __cpu_detect_caps.type = CPU_DETECT_TYPE_OTHER; +#endif + + /* Count the number of CPUs in system */ +#if !defined(OS_WIN32) && !defined(OS_UNKNOWN) && defined(_SC_NPROCESSORS_ONLN) + __cpu_detect_caps.nrcpu = sysconf(_SC_NPROCESSORS_ONLN); + if (__cpu_detect_caps.nrcpu == -1) + __cpu_detect_caps.nrcpu = 1; + +#elif defined(OS_NETBSD) || defined(OS_FREEBSD) || defined(OS_OPENBSD) + + mib[0] = CTL_HW; + mib[1] = HW_NCPU; + + len = sizeof (ncpu); + sysctl(mib, 2, &ncpu, &len, NULL, 0); + __cpu_detect_caps.nrcpu = ncpu; + +#else + __cpu_detect_caps.nrcpu = 1; +#endif + +#if defined(ARCH_X86) + /* No cpuid, old 486 or lower */ + if (has_cpuid() == 0) + return; + + __cpu_detect_caps.cacheline = 32; + + /* Get max cpuid level */ + cpuid(0x00000000, regs); + + if (regs[0] >= 0x00000001) { + unsigned int cacheline; + + cpuid (0x00000001, regs2); + + __cpu_detect_caps.x86cpuType = (regs2[0] >> 8) & 0xf; + if (__cpu_detect_caps.x86cpuType == 0xf) + __cpu_detect_caps.x86cpuType = 8 + ((regs2[0] >> 20) & 255); /* use extended family (P4, IA64) */ + + /* general feature flags */ + __cpu_detect_caps.hasTSC = (regs2[3] & (1 << 8 )) >> 8; /* 0x0000010 */ + __cpu_detect_caps.hasMMX = (regs2[3] & (1 << 23 )) >> 23; /* 0x0800000 */ + __cpu_detect_caps.hasSSE = (regs2[3] & (1 << 25 )) >> 25; /* 0x2000000 */ + __cpu_detect_caps.hasSSE2 = (regs2[3] & (1 << 26 )) >> 26; /* 0x4000000 */ + __cpu_detect_caps.hasSSE3 = (regs2[2] & (1)); /* 0x0000001 */ + __cpu_detect_caps.hasSSSE3 = (regs2[2] & (1 << 9 )) >> 9; /* 0x0000020 */ + __cpu_detect_caps.hasMMX2 = __cpu_detect_caps.hasSSE; /* SSE cpus supports mmxext too */ + + cacheline = ((regs2[1] >> 8) & 0xFF) * 8; + if (cacheline > 0) + __cpu_detect_caps.cacheline = cacheline; + } + + cpuid(0x80000000, regs); + + if (regs[0] >= 0x80000001) { + + cpuid(0x80000001, regs2); + + __cpu_detect_caps.hasMMX |= (regs2[3] & (1 << 23 )) >> 23; /* 0x0800000 */ + __cpu_detect_caps.hasMMX2 |= (regs2[3] & (1 << 22 )) >> 22; /* 0x400000 */ + __cpu_detect_caps.has3DNow = (regs2[3] & (1 << 31 )) >> 31; /* 0x80000000 */ + __cpu_detect_caps.has3DNowExt = (regs2[3] & (1 << 30 )) >> 30; + } + + if (regs[0] >= 0x80000006) { + cpuid(0x80000006, regs2); + __cpu_detect_caps.cacheline = regs2[2] & 0xFF; + } + + +#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_NETBSD) || defined(OS_CYGWIN) || defined(OS_OPENBSD) + if (__cpu_detect_caps.hasSSE) + check_os_katmai_support(); + + if (!__cpu_detect_caps.hasSSE) { + __cpu_detect_caps.hasSSE2 = 0; + __cpu_detect_caps.hasSSE3 = 0; + __cpu_detect_caps.hasSSSE3 = 0; + } +#else + __cpu_detect_caps.hasSSE = 0; + __cpu_detect_caps.hasSSE2 = 0; + __cpu_detect_caps.hasSSE3 = 0; + __cpu_detect_caps.hasSSSE3 = 0; +#endif +#endif /* ARCH_X86 */ + +#if defined(ARCH_POWERPC) + check_os_altivec_support(); +#endif /* ARCH_POWERPC */ + + __cpu_detect_initialized = 1; +} + +struct cpu_detect_caps *cpu_detect_get_caps() +{ + return &__cpu_detect_caps; +} + +/* The getters and setters for feature flags */ +int cpu_detect_get_tsc() +{ + return __cpu_detect_caps.hasTSC; +} + +int cpu_detect_get_mmx() +{ + return __cpu_detect_caps.hasMMX; +} + +int cpu_detect_get_mmx2() +{ + return __cpu_detect_caps.hasMMX2; +} + +int cpu_detect_get_sse() +{ + return __cpu_detect_caps.hasSSE; +} + +int cpu_detect_get_sse2() +{ + return __cpu_detect_caps.hasSSE2; +} + +int cpu_detect_get_sse3() +{ + return __cpu_detect_caps.hasSSE3; +} + +int cpu_detect_get_ssse3() +{ + return __cpu_detect_caps.hasSSSE3; +} + +int cpu_detect_get_3dnow() +{ + return __cpu_detect_caps.has3DNow; +} + +int cpu_detect_get_3dnow2() +{ + return __cpu_detect_caps.has3DNowExt; +} + +int cpu_detect_get_altivec() +{ + return __cpu_detect_caps.hasAltiVec; +} + |