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author | Andrew Murray <andrew.murray@arm.com> | 2019-04-09 12:52:40 +0300 |
---|---|---|
committer | Will Deacon <will.deacon@arm.com> | 2019-04-16 18:27:12 +0300 |
commit | aaba098fe6ce594ae6f963dc041be6307e499f19 (patch) | |
tree | 619d471f27d373e460f251afacddc19889dafe5c /arch/arm64/crypto/aes-ce-ccm-glue.c | |
parent | a823c35ff2eda73046cc1847326071de350fceda (diff) | |
download | linux-aaba098fe6ce594ae6f963dc041be6307e499f19.tar.xz |
arm64: HWCAP: add support for AT_HWCAP2
As we will exhaust the first 32 bits of AT_HWCAP let's start
exposing AT_HWCAP2 to userspace to give us up to 64 caps.
Whilst it's possible to use the remaining 32 bits of AT_HWCAP, we
prefer to expand into AT_HWCAP2 in order to provide a consistent
view to userspace between ILP32 and LP64. However internal to the
kernel we prefer to continue to use the full space of elf_hwcap.
To reduce complexity and allow for future expansion, we now
represent hwcaps in the kernel as ordinals and use a
KERNEL_HWCAP_ prefix. This allows us to support automatic feature
based module loading for all our hwcaps.
We introduce cpu_set_feature to set hwcaps which complements the
existing cpu_have_feature helper. These helpers allow us to clean
up existing direct uses of elf_hwcap and reduce any future effort
required to move beyond 64 caps.
For convenience we also introduce cpu_{have,set}_named_feature which
makes use of the cpu_feature macro to allow providing a hwcap name
without a {KERNEL_}HWCAP_ prefix.
Signed-off-by: Andrew Murray <andrew.murray@arm.com>
[will: use const_ilog2() and tweak documentation]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/crypto/aes-ce-ccm-glue.c')
-rw-r--r-- | arch/arm64/crypto/aes-ce-ccm-glue.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/crypto/aes-ce-ccm-glue.c b/arch/arm64/crypto/aes-ce-ccm-glue.c index 5fc6f51908fd..036ea77f83bc 100644 --- a/arch/arm64/crypto/aes-ce-ccm-glue.c +++ b/arch/arm64/crypto/aes-ce-ccm-glue.c @@ -372,7 +372,7 @@ static struct aead_alg ccm_aes_alg = { static int __init aes_mod_init(void) { - if (!(elf_hwcap & HWCAP_AES)) + if (!cpu_have_named_feature(AES)) return -ENODEV; return crypto_register_aead(&ccm_aes_alg); } |