diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/utils/cpuid.cpp | 127 |
1 files changed, 74 insertions, 53 deletions
diff --git a/src/utils/cpuid.cpp b/src/utils/cpuid.cpp index 2ba7f9b77..d024a19c0 100644 --- a/src/utils/cpuid.cpp +++ b/src/utils/cpuid.cpp @@ -10,7 +10,11 @@ #include <botan/loadstor.h> #include <botan/mem_ops.h> -#if defined(BOTAN_TARGET_ARCH_IS_IA32) || defined(BOTAN_TARGET_ARCH_IS_AMD64) +#if defined(BOTAN_TARGET_OS_IS_DARWIN) + #include <sys/sysctl.h> +#endif + +#if defined(BOTAN_TARGET_IS_X86_FAMILY) #if defined(BOTAN_BUILD_COMPILER_IS_MSVC) @@ -64,6 +68,72 @@ u32bit get_x86_cache_line_size() return 32; // default cache line guess } +#if defined(BOTAN_TARGET_IS_PPC_FAMILY) + +bool altivec_check_sysctl() + { +#if defined(BOTAN_TARGET_OS_IS_DARWIN) + + // From Apple's docs + int sels[2] = { CTL_HW, HW_VECTORUNIT }; + int vector_type = 0; + size_t length = sizeof(vector_type); + int error = sysctl(sels, 2, &vector_type, &length, NULL, 0); + + if(error == 0 && vector_type > 0) + return true; +#endif + + return false; + } + +bool altivec_check_pvr_emul() + { + bool altivec_capable = false; + +#if defined(BOTAN_TARGET_OS_IS_LINUX) || defined(BOTAN_TARGET_OS_IS_NETBSD) + + /* + On PowerPC, MSR 287 is PVR, the Processor Version Number + Normally it is only accessible to ring 0, but Linux and NetBSD + (others, too, maybe?) will trap and emulate it for us. + + PVR identifiers for various AltiVec enabled CPUs. Taken from + PearPC and Linux sources, mostly. + */ + + const u16bit PVR_G4_7400 = 0x000C; + const u16bit PVR_G5_970 = 0x0039; + const u16bit PVR_G5_970FX = 0x003C; + const u16bit PVR_G5_970MP = 0x0044; + const u16bit PVR_G5_970GX = 0x0045; + const u16bit PVR_POWER6 = 0x003E; + const u16bit PVR_CELL_PPU = 0x0070; + + // Motorola produced G4s with PVR 0x800[0123C] (at least) + const u16bit PVR_G4_74xx_24 = 0x800; + + u32bit pvr = 0; + + asm volatile("mfspr %0, 287" : "=r" (pvr)); + + // Top 16 bit suffice to identify model + pvr >>= 16; + + altivec_capable |= (pvr == PVR_G4_7400); + altivec_capable |= ((pvr >> 8) == PVR_G4_74xx_24); + altivec_capable |= (pvr == PVR_G5_970); + altivec_capable |= (pvr == PVR_G5_970FX); + altivec_capable |= (pvr == PVR_G5_970MP); + altivec_capable |= (pvr == PVR_G5_970GX); + altivec_capable |= (pvr == PVR_CELL_PPU); +#endif + + return altivec_capable; + } + +#endif + } /* @@ -105,58 +175,9 @@ bool CPUID::has_altivec() if(first_time) { -#if defined(BOTAN_TARGET_ARCH_IS_PPC) || defined(BOTAN_TARGET_ARCH_IS_PPC64) - - /* - PVR identifiers for various AltiVec enabled CPUs. Taken from - PearPC and Linux sources, mostly. - */ - const u16bit PVR_G4_7400 = 0x000C; - const u16bit PVR_G5_970 = 0x0039; - const u16bit PVR_G5_970FX = 0x003C; - const u16bit PVR_G5_970MP = 0x0044; - const u16bit PVR_G5_970GX = 0x0045; - const u16bit PVR_POWER6 = 0x003E; - const u16bit PVR_CELL_PPU = 0x0070; - - // Motorola produced G4s with PVR 0x800[0123C] (at least) - const u16bit PVR_G4_74xx_24 = 0x800; - - /* - On PowerPC, MSR 287 is PVR, the Processor Version Number - - Normally it is only accessible to ring 0, but Linux and NetBSD - (at least) will trap and emulate it for us. This is roughly 20x - saner than every other approach I've seen for AltiVec detection - (all of which are entirely OS specific, to boot). - - Apparently OS X doesn't support this, but then again OS X - doesn't really support PPC anymore, so I'm not worrying about it. - - For OSes that aren't (known to) support the emulation, skip the - call, leaving pvr as 0 which will cause all subsequent model - number checks to fail (and we'll assume no AltiVec) - */ - -#if defined(BOTAN_TARGET_OS_IS_LINUX) || defined(BOTAN_TARGET_OS_IS_NETBSD) - #define BOTAN_TARGET_OS_SUPPORTS_MFSPR_EMUL -#endif - - u32bit pvr = 0; - -#if defined(BOTAN_TARGET_OS_SUPPORTS_MFSPR_EMUL) - asm volatile("mfspr %0, 287" : "=r" (pvr)); -#endif - // Top 16 bit suffice to identify model - pvr >>= 16; - - altivec_capable |= (pvr == PVR_G4_7400); - altivec_capable |= ((pvr >> 8) == PVR_G4_74xx_24); - altivec_capable |= (pvr == PVR_G5_970); - altivec_capable |= (pvr == PVR_G5_970FX); - altivec_capable |= (pvr == PVR_G5_970MP); - altivec_capable |= (pvr == PVR_G5_970GX); - altivec_capable |= (pvr == PVR_CELL_PPU); +#if defined(BOTAN_TARGET_IS_PPC_FAMILY) + if(altivec_check_sysctl() || altivec_check_pvr_emul()) + altivec_capable = true; #endif first_time = false; |