diff options
| author | Javi Merino <javi.merino@arm.com> | 2012-08-29 09:47:19 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-03-20 17:26:24 +0000 |
| commit | 4c7aa0021356ee91b96cea51b8b7fadebaba489e (patch) | |
| tree | 2af7dd584c30a3ce79cc912a4873bd743c6d08ca /arch/arm64/include/asm/cputype.h | |
| parent | 3e98fdacc59bbbdbb659be1a144ccc48ed4860fa (diff) | |
arm64: kernel: initialise cpu_logical_map from the DT
When booting the kernel, the cpu logical id map must be initialised
using device tree data passed by FW or through an embedded blob.
This patch parses the reg property in device tree "cpu" nodes,
retrieves the corresponding CPUs hardware identifiers (MPIDR) and
initialises the cpu logical map accordingly.
The device tree HW identifiers are considered valid if all CPU nodes
contain a "reg" property, there are no duplicate "reg" entries and the
DT defines a CPU node whose "reg" property defines affinity levels
that matches those of the boot CPU.
The primary CPU is assigned cpu logical number 0 to keep the current
convention valid.
Based on a0ae02405076ac32bd17ece976e914b5b6075bb0 (ARM: kernel: add
device tree init map function).
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cputype.h')
| -rw-r--r-- | arch/arm64/include/asm/cputype.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 9397a17bec0b..3780b2e7f88f 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -28,6 +28,8 @@ #define INVALID_HWID ULONG_MAX +#define MPIDR_HWID_BITMASK 0xff00ffffff + #define read_cpuid(reg) ({ \ u64 __val; \ asm("mrs %0, " reg : "=r" (__val)); \ |