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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-03-12 10:04:14 +0000
committerWill Deacon <will.deacon@arm.com>2018-03-19 18:14:27 +0000
commit7206dc93a58fb76421c4411eefa3c003337bcb2d (patch)
tree9bf4f279e538a41472bf6f5e8e3088645c86f8b0 /Documentation/arm64
parent847ecd3fa311cde0f10a1b66c572abb136742b1d (diff)
downloadlinux-7206dc93a58fb76421c4411eefa3c003337bcb2d.tar.bz2
arm64: Expose Arm v8.4 features
Expose the new features introduced by Arm v8.4 extensions to Arm v8-A profile. These include : 1) Data indpendent timing of instructions. (DIT, exposed as HWCAP_DIT) 2) Unaligned atomic instructions and Single-copy atomicity of loads and stores. (AT, expose as HWCAP_USCAT) 3) LDAPR and STLR instructions with immediate offsets (extension to LRCPC, exposed as HWCAP_ILRCPC) 4) Flag manipulation instructions (TS, exposed as HWCAP_FLAGM). Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Dave Martin <dave.martin@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/arm64')
-rw-r--r--Documentation/arm64/cpu-feature-registers.txt10
-rw-r--r--Documentation/arm64/elf_hwcaps.txt16
2 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/arm64/cpu-feature-registers.txt b/Documentation/arm64/cpu-feature-registers.txt
index 22cfb86143ee..7964f03846b1 100644
--- a/Documentation/arm64/cpu-feature-registers.txt
+++ b/Documentation/arm64/cpu-feature-registers.txt
@@ -110,6 +110,7 @@ infrastructure:
x--------------------------------------------------x
| Name | bits | visible |
|--------------------------------------------------|
+ | TS | [55-52] | y |
|--------------------------------------------------|
| FHM | [51-48] | y |
|--------------------------------------------------|
@@ -139,6 +140,7 @@ infrastructure:
x--------------------------------------------------x
| Name | bits | visible |
|--------------------------------------------------|
+ | DIT | [51-48] | y |
|--------------------------------------------------|
| SVE | [35-32] | y |
|--------------------------------------------------|
@@ -191,6 +193,14 @@ infrastructure:
| DPB | [3-0] | y |
x--------------------------------------------------x
+ 5) ID_AA64MMFR2_EL1 - Memory model feature register 2
+
+ x--------------------------------------------------x
+ | Name | bits | visible |
+ |--------------------------------------------------|
+ | AT | [35-32] | y |
+ x--------------------------------------------------x
+
Appendix I: Example
---------------------------
diff --git a/Documentation/arm64/elf_hwcaps.txt b/Documentation/arm64/elf_hwcaps.txt
index 57324ee55ecc..d6aff2c5e9e2 100644
--- a/Documentation/arm64/elf_hwcaps.txt
+++ b/Documentation/arm64/elf_hwcaps.txt
@@ -162,3 +162,19 @@ HWCAP_SVE
HWCAP_ASIMDFHM
Functionality implied by ID_AA64ISAR0_EL1.FHM == 0b0001.
+
+HWCAP_DIT
+
+ Functionality implied by ID_AA64PFR0_EL1.DIT == 0b0001.
+
+HWCAP_USCAT
+
+ Functionality implied by ID_AA64MMFR2_EL1.AT == 0b0001.
+
+HWCAP_ILRCPC
+
+ Functionality implied by ID_AA64ISR1_EL1.LRCPC == 0b0002.
+
+HWCAP_FLAGM
+
+ Functionality implied by ID_AA64ISAR0_EL1.TS == 0b0001.