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arm64: Expose Arm v8.4 features

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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 <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mark Rutland <[email protected]>
Reviewed-by: Dave Martin <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Suzuki K Poulose 2018-03-12 10:04:14 +00:00 • committed by Will Deacon
commit 7206dc93a5
6 changed files with 44 additions and 0 deletions
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10
Documentation/arm64/cpu-feature-registers.txt
View file

@ -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
---------------------------

16
Documentation/arm64/elf_hwcaps.txt
View file

@ -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.