[PATCH v2 01/13] arm64: kernel: add MPIDR_EL1 accessors macros
From: Will Deacon <hidden>
Date: 2013-10-15 10:11:30
Also in:
linux-pm
On Mon, Oct 14, 2013 at 12:02:58PM +0100, Lorenzo Pieralisi wrote:
quoted hunk ↗ jump to hunk
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. Signed-off-by: Lorenzo Pieralisi <redacted> --- arch/arm64/include/asm/cputype.h | 10 ++++++++++ 1 file changed, 10 insertions(+)diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 5fe138e..2c9e295 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 8 +#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1) + +#define MPIDR_LEVEL_SHIFT(level) ({ \ + (level == 3) ? 32 : MPIDR_LEVEL_BITS * level; \
You can avoid the check if you do: ((1 << level) >> 1) << 3) where that '3' is log2 MPIDR_LEVEL_BITS, so you could factor that out and redefine MPIDR_LEVEL_BITS in terms of a shift. Will