ARM: 8319/1: advertise availability of v8 Crypto instructions
When running the 32-bit ARM kernel on ARMv8 capable bare metal (e.g., 32-bit Android userland and kernel on a Cortex-A53), or as a KVM guest on a 64-bit host, we should advertise the availability of the Crypto instructions, so that userland libraries such as OpenSSL may use them. (Support for the v8 Crypto instructions in the 32-bit build was added to OpenSSL more than six months ago) This adds the ID feature bit detection, and sets elf_hwcap2 accordingly. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
parent
b8c9592b4a
commit
a092aedb81
|
@ -376,6 +376,7 @@ void __init early_print(const char *str, ...)
|
|||
static void __init cpuid_init_hwcaps(void)
|
||||
{
|
||||
int block;
|
||||
u32 isar5;
|
||||
|
||||
if (cpu_architecture() < CPU_ARCH_ARMv7)
|
||||
return;
|
||||
|
@ -390,6 +391,27 @@ static void __init cpuid_init_hwcaps(void)
|
|||
block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
|
||||
if (block >= 5)
|
||||
elf_hwcap |= HWCAP_LPAE;
|
||||
|
||||
/* check for supported v8 Crypto instructions */
|
||||
isar5 = read_cpuid_ext(CPUID_EXT_ISAR5);
|
||||
|
||||
block = cpuid_feature_extract_field(isar5, 4);
|
||||
if (block >= 2)
|
||||
elf_hwcap2 |= HWCAP2_PMULL;
|
||||
if (block >= 1)
|
||||
elf_hwcap2 |= HWCAP2_AES;
|
||||
|
||||
block = cpuid_feature_extract_field(isar5, 8);
|
||||
if (block >= 1)
|
||||
elf_hwcap2 |= HWCAP2_SHA1;
|
||||
|
||||
block = cpuid_feature_extract_field(isar5, 12);
|
||||
if (block >= 1)
|
||||
elf_hwcap2 |= HWCAP2_SHA2;
|
||||
|
||||
block = cpuid_feature_extract_field(isar5, 16);
|
||||
if (block >= 1)
|
||||
elf_hwcap2 |= HWCAP2_CRC32;
|
||||
}
|
||||
|
||||
static void __init elf_hwcap_fixup(void)
|
||||
|
|
Loading…
Reference in a new issue