[PATCH v6 32/37] arm: Implement read_mpidr on armv7

Implement read_mpidr() on armv7 to make use of it in generic code that compiles on both armv7 and armv8.

Signed-off-by: Patrick Rudolph patrick.rudolph@9elements.com --- arch/arm/include/asm/system.h | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 7e30cac32a..94c6f8f134 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -384,6 +384,15 @@ void switch_to_hypervisor_ret(void); #define wfi() #endif

+static inline unsigned long read_mpidr(void) +{ + unsigned long val; + + asm volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (val)); + + return val; +} + static inline unsigned long get_cpsr(void) { unsigned long cpsr;