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| author | Joey Gouly <joey.gouly@arm.com> | 2021-12-10 19:54:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-11 14:22:33 +0300 |
| commit | a4c234f60269e05147bfc9d6061705067af903db (patch) | |
| tree | 5053f8f5a6cec16b634a85e92fa144a51d9af06c /Documentation | |
| parent | 912961e188dcd4ca3d7188b9badd96a90469adfb (diff) | |
| download | linux-a4c234f60269e05147bfc9d6061705067af903db.tar.xz | |
arm64: cpufeature: add HWCAP for FEAT_AFP
commit 5c13f042e73200b50573ace63e1a6b94e2917616 upstream.
Add a new HWCAP to detect the Alternate Floating-point Behaviour
feature (FEAT_AFP), introduced in Armv8.7.
Also expose this to userspace in the ID_AA64MMFR1_EL1 feature register.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211210165432.8106-2-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm64/cpu-feature-registers.rst | 9 | ||||
| -rw-r--r-- | Documentation/arm64/elf_hwcaps.rst | 4 |
2 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/arm64/cpu-feature-registers.rst b/Documentation/arm64/cpu-feature-registers.rst index 9f9b8fd06089..1b19d20c2dbd 100644 --- a/Documentation/arm64/cpu-feature-registers.rst +++ b/Documentation/arm64/cpu-feature-registers.rst @@ -275,6 +275,15 @@ infrastructure: | SVEVer | [3-0] | y | +------------------------------+---------+---------+ + 8) ID_AA64MMFR1_EL1 - Memory model feature register 1 + + +------------------------------+---------+---------+ + | Name | bits | visible | + +------------------------------+---------+---------+ + | AFP | [47-44] | y | + +------------------------------+---------+---------+ + + Appendix I: Example ------------------- diff --git a/Documentation/arm64/elf_hwcaps.rst b/Documentation/arm64/elf_hwcaps.rst index af106af8e1c0..247728d37911 100644 --- a/Documentation/arm64/elf_hwcaps.rst +++ b/Documentation/arm64/elf_hwcaps.rst @@ -251,6 +251,10 @@ HWCAP2_ECV Functionality implied by ID_AA64MMFR0_EL1.ECV == 0b0001. +HWCAP2_AFP + + Functionality implied by ID_AA64MFR1_EL1.AFP == 0b0001. + 4. Unused AT_HWCAP bits ----------------------- |