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/*
* Unix implementation of the OS query functions that detect Arm
* architecture extensions.
*/
#include "putty.h"
#include "ssh.h"
#include "utils/arm_arch_queries.h"
#if defined __arm__ || defined __aarch64__
bool platform_aes_neon_available(void)
{
#if defined HWCAP_AES
return getauxval(AT_HWCAP) & HWCAP_AES;
#elif defined HWCAP2_AES
return getauxval(AT_HWCAP2) & HWCAP2_AES;
#elif defined __APPLE__
SysctlResult res = test_sysctl_flag("hw.optional.arm.FEAT_AES");
/* Older M1 macOS didn't provide this flag, but as far as I know
* implemented the crypto extension anyway, so treat 'feature
* missing' as 'implemented' */
return res != SYSCTL_OFF;
#else
return false;
#endif
}
bool platform_pmull_neon_available(void)
{
#if defined HWCAP_PMULL
return getauxval(AT_HWCAP) & HWCAP_PMULL;
#elif defined HWCAP2_PMULL
return getauxval(AT_HWCAP2) & HWCAP2_PMULL;
#elif defined __APPLE__
SysctlResult res = test_sysctl_flag("hw.optional.arm.FEAT_PMULL");
/* As above, treat 'missing' as enabled */
return res != SYSCTL_OFF;
#else
return false;
#endif
}
bool platform_sha256_neon_available(void)
{
#if defined HWCAP_SHA2
return getauxval(AT_HWCAP) & HWCAP_SHA2;
#elif defined HWCAP2_SHA2
return getauxval(AT_HWCAP2) & HWCAP2_SHA2;
#elif defined __APPLE__
SysctlResult res = test_sysctl_flag("hw.optional.arm.FEAT_SHA256");
/* As above, treat 'missing' as enabled */
return res != SYSCTL_OFF;
#else
return false;
#endif
}
bool platform_sha1_neon_available(void)
{
#if defined HWCAP_SHA1
return getauxval(AT_HWCAP) & HWCAP_SHA1;
#elif defined HWCAP2_SHA1
return getauxval(AT_HWCAP2) & HWCAP2_SHA1;
#elif defined __APPLE__
SysctlResult res = test_sysctl_flag("hw.optional.arm.FEAT_SHA1");
/* As above, treat 'missing' as enabled */
return res != SYSCTL_OFF;
#else
return false;
#endif
}
bool platform_sha512_neon_available(void)
{
#if defined HWCAP_SHA512
return getauxval(AT_HWCAP) & HWCAP_SHA512;
#elif defined HWCAP2_SHA512
return getauxval(AT_HWCAP2) & HWCAP2_SHA512;
#elif defined __APPLE__
/* There are two sysctl flags for this, apparently invented at
* different times. Try both, falling back to the older one. */
SysctlResult res = test_sysctl_flag("hw.optional.arm.FEAT_SHA512");
if (res != SYSCTL_MISSING)
return res == SYSCTL_ON;
res = test_sysctl_flag("hw.optional.armv8_2_sha512");
return res == SYSCTL_ON;
#else
return false;
#endif
}
#else /* defined __arm__ || defined __aarch64__ */
/*
* Include _something_ in this file to prevent an annoying compiler
* warning, and to avoid having to condition out this file in
* CMakeLists. It's in a library, so this variable shouldn't end up in
* any actual program, because nothing will refer to it.
*/
const int arm_arch_queries_dummy_variable = 0;
#endif /* defined __arm__ || defined __aarch64__ */
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