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/*
* Runtime CPU detection for POWER/PowerPC
* (C) 2009,2010,2013,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/cpuid.h>
#include <botan/internal/os_utils.h>
#if defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY)
/*
* On Darwin and OpenBSD ppc, use sysctl to detect AltiVec
*/
#if defined(BOTAN_TARGET_OS_IS_DARWIN)
#include <sys/sysctl.h>
#elif defined(BOTAN_TARGET_OS_IS_OPENBSD)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#endif
#endif
namespace Botan {
#if defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY)
/*
* PowerPC specific block: check for AltiVec using either
* sysctl or by reading processor version number register.
*/
uint64_t CPUID::detect_cpu_features(size_t* cache_line_size)
{
#if defined(BOTAN_TARGET_OS_IS_DARWIN) || defined(BOTAN_TARGET_OS_IS_OPENBSD)
// On Darwin/OS X and OpenBSD, use sysctl
int sels[2] = {
#if defined(BOTAN_TARGET_OS_IS_OPENBSD)
CTL_MACHDEP, CPU_ALTIVEC
#else
CTL_HW, HW_VECTORUNIT
#endif
};
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 CPUID::CPUID_ALTIVEC_BIT;
#else
/*
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.
*/
int pvr = OS::run_cpu_instruction_probe([]() -> int {
uint32_t pvr = 0;
asm volatile("mfspr %0, 287" : "=r" (pvr));
// Top 16 bits suffice to identify the model
return static_cast<int>(pvr >> 16);
});
if(pvr > 0)
{
const uint16_t ALTIVEC_PVR[] = {
0x003E, // IBM POWER6,
0x003F, // IBM POWER7,
0x004B, // IBM POWER8,
0x000C, // G4-7400
0x0039, // G5 970
0x003C, // G5 970FX
0x0044, // G5 970MP
0x0070, // Cell PPU
0, // end
};
for(size_t i = 0; ALTIVEC_PVR[i]; ++i)
{
if(pvr == ALTIVEC_PVR[i])
return CPUID::CPUID_ALTIVEC_BIT;
}
return 0;
}
// TODO try direct instruction probing
#endif
return 0;
}
#endif
}
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