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arm64: elf: use cpuid_feature_extract_field for hwcap detection 

cpuid_feature_extract_field takes care of the fiddly ID register
field sign-extension, so use that instead of rolling our own version.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2015-07-27 16:55:32 +01:00
parent 2e94da1379
commit 309585b0b9
1 changed files with 15 additions and 20 deletions
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35
arch/arm64/kernel/setup.c
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@ -223,7 +223,8 @@ void __init up_late_init(void)
static void __init setup_processor(void)
{
u64 features, block;
u64 features;
s64 block;
u32 cwg;
int cls;
@ -253,8 +254,8 @@ static void __init setup_processor(void)
* for non-negative values. Negative values are reserved.
*/
features = read_cpuid(ID_AA64ISAR0_EL1);
block = (features >> 4) & 0xf;
if (!(block & 0x8)) {
block = cpuid_feature_extract_field(features, 4);
if (block > 0) {
switch (block) {
default:
case 2:
@ -266,20 +267,17 @@ static void __init setup_processor(void)
}
}
block = (features >> 8) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 8) > 0)
elf_hwcap |= HWCAP_SHA1;
block = (features >> 12) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 12) > 0)
elf_hwcap |= HWCAP_SHA2;
block = (features >> 16) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 16) > 0)
elf_hwcap |= HWCAP_CRC32;
block = (features >> 20) & 0xf;
if (!(block & 0x8)) {
block = cpuid_feature_extract_field(features, 20);
if (block > 0) {
switch (block) {
default:
case 2:
@ -294,11 +292,11 @@ static void __init setup_processor(void)
#ifdef CONFIG_COMPAT
/*
* ID_ISAR5_EL1 carries similar information as above, but pertaining to
* the Aarch32 32-bit execution state.
* the AArch32 32-bit execution state.
*/
features = read_cpuid(ID_ISAR5_EL1);
block = (features >> 4) & 0xf;
if (!(block & 0x8)) {
block = cpuid_feature_extract_field(features, 4);
if (block > 0) {
switch (block) {
default:
case 2:
@ -310,16 +308,13 @@ static void __init setup_processor(void)
}
}
block = (features >> 8) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 8) > 0)
compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1;
block = (features >> 12) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 12) > 0)
compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2;
block = (features >> 16) & 0xf;
if (block && !(block & 0x8))
if (cpuid_feature_extract_field(features, 16) > 0)
compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32;
#endif
}