From: "Suzuki K. Poulose" <[email protected]> Add an API for reading a safe CPUID value across the system
Signed-off-by: Suzuki K. Poulose <[email protected]> --- arch/arm64/include/asm/cpu.h | 2 ++ arch/arm64/kernel/cpuinfo.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index cb25cb9..17a871d 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -177,6 +177,7 @@ struct arm64_ftr_reg { .ftr_bits = &((ftr_table)[0]), \ } +#define read_system_cpuid(id) read_system_reg(SYS_##id) /* * Records attributes of an individual CPU. */ @@ -226,4 +227,5 @@ static inline u64 arm64_ftr_value(struct arm64_ftr_bits *ftrp, u64 reg) return ((reg >> ftrp->shift) & ftrp->mask); } +u64 read_system_reg(enum sys_id id); #endif /* __ASM_CPU_H */ diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 9145eef..7d140f7 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -310,6 +310,15 @@ static struct arm64_ftr_reg* get_arm64_sys_reg(enum sys_id sys_id) return NULL; } +u64 read_system_reg(enum sys_id id) +{ + struct arm64_ftr_reg *regp = get_arm64_sys_reg(id); + + /* We shouldn't get a request for an unsupported register */ + BUG_ON(!regp); + return regp->sys_val; +} + static u64 arm64_ftr_set_value(struct arm64_ftr_bits *ftrp, u64 reg, u64 ftr_val) { u64 mask = ftrp->mask << ftrp->shift; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
