diff options
| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2013-08-05 15:24:27 +0100 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2014-03-10 13:38:37 +0800 |
| commit | 1447ced2fb88eb2d7fa7df79f156569ffaa97913 (patch) | |
| tree | 6502e112e48e72f0bbdbe54e4c45d4d5f652ecf8 /arch | |
| parent | ab89b1b300a1ae3c13a9c965770cdadc60d53d21 (diff) | |
arm64: kernel: add MPIDR_EL1 accessors macros
In order to simplify access to different affinity levels within the
MPIDR_EL1 register values, this patch implements some preprocessor
macros that allow to retrieve the MPIDR_EL1 affinity level value according
to the level passed as input parameter.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/cputype.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index cf2749488cd..a8053d89512 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -30,6 +30,16 @@ #define MPIDR_HWID_BITMASK 0xff00ffffff +#define MPIDR_LEVEL_BITS_SHIFT 3 +#define MPIDR_LEVEL_BITS (1 << MPIDR_LEVEL_BITS_SHIFT) +#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1) + +#define MPIDR_LEVEL_SHIFT(level) \ + (((1 << level) >> 1) << MPIDR_LEVEL_BITS_SHIFT) + +#define MPIDR_AFFINITY_LEVEL(mpidr, level) \ + ((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK) + #define read_cpuid(reg) ({ \ u64 __val; \ asm("mrs %0, " reg : "=r" (__val)); \ |