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Diffstat (limited to 'Documentation/arch/arm64/elf_hwcaps.rst')
| -rw-r--r-- | Documentation/arch/arm64/elf_hwcaps.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst index 694f67fa07d1..2ff922a406ad 100644 --- a/Documentation/arch/arm64/elf_hwcaps.rst +++ b/Documentation/arch/arm64/elf_hwcaps.rst @@ -16,9 +16,9 @@ architected discovery mechanism available to userspace code at EL0. The kernel exposes the presence of these features to userspace through a set of flags called hwcaps, exposed in the auxiliary vector. -Userspace software can test for features by acquiring the AT_HWCAP or -AT_HWCAP2 entry of the auxiliary vector, and testing whether the relevant -flags are set, e.g.:: +Userspace software can test for features by acquiring the AT_HWCAP, +AT_HWCAP2 or AT_HWCAP3 entry of the auxiliary vector, and testing +whether the relevant flags are set, e.g.:: bool floating_point_is_present(void) { @@ -170,6 +170,10 @@ HWCAP_PACG ID_AA64ISAR1_EL1.GPI == 0b0001, as described by Documentation/arch/arm64/pointer-authentication.rst. +HWCAP_GCS + Functionality implied by ID_AA64PFR1_EL1.GCS == 0b1, as + described by Documentation/arch/arm64/gcs.rst. + HWCAP2_DCPODP Functionality implied by ID_AA64ISAR1_EL1.DPB == 0b0010. |