mirror of https://gitee.com/openkylin/linux.git
aaba098fe6
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>
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| .. | ||
| .gitignore | ||
| Kconfig | ||
| Makefile | ||
| aes-ce-ccm-core.S | ||
| aes-ce-ccm-glue.c | ||
| aes-ce-core.S | ||
| aes-ce-glue.c | ||
| aes-ce-setkey.h | ||
| aes-ce.S | ||
| aes-cipher-core.S | ||
| aes-cipher-glue.c | ||
| aes-ctr-fallback.h | ||
| aes-glue.c | ||
| aes-modes.S | ||
| aes-neon.S | ||
| aes-neonbs-core.S | ||
| aes-neonbs-glue.c | ||
| chacha-neon-core.S | ||
| chacha-neon-glue.c | ||
| crct10dif-ce-core.S | ||
| crct10dif-ce-glue.c | ||
| ghash-ce-core.S | ||
| ghash-ce-glue.c | ||
| nh-neon-core.S | ||
| nhpoly1305-neon-glue.c | ||
| sha1-ce-core.S | ||
| sha1-ce-glue.c | ||
| sha2-ce-core.S | ||
| sha2-ce-glue.c | ||
| sha3-ce-core.S | ||
| sha3-ce-glue.c | ||
| sha256-core.S_shipped | ||
| sha256-glue.c | ||
| sha512-armv8.pl | ||
| sha512-ce-core.S | ||
| sha512-ce-glue.c | ||
| sha512-core.S_shipped | ||
| sha512-glue.c | ||
| sm3-ce-core.S | ||
| sm3-ce-glue.c | ||
| sm4-ce-core.S | ||
| sm4-ce-glue.c | ||