From 93951f4ed8b15c7140961a24d7fa756e3ec204ff Mon Sep 17 00:00:00 2001 From: Hung-Te Lin Date: Thu, 8 Aug 2013 11:27:27 +0800 Subject: armv7: Add CPU & MP primitive instructions To configure multi-processors, we need the intrinsic functions to get core ID, put core into idle state, and to wake up cores. Change-Id: I87a62dab6efd6c8bb0c8e46373da7c7eb7b16b35 Signed-off-by: Hung-Te Lin Reviewed-on: https://gerrit.chromium.org/gerrit/65112 Reviewed-on: http://review.coreboot.org/4444 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- src/arch/armv7/include/arch/cpu.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'src') diff --git a/src/arch/armv7/include/arch/cpu.h b/src/arch/armv7/include/arch/cpu.h index f8b3005e95..efd2dc9af9 100644 --- a/src/arch/armv7/include/arch/cpu.h +++ b/src/arch/armv7/include/arch/cpu.h @@ -48,4 +48,40 @@ struct cpuinfo_arm { #endif +/* Primitives for CPU and MP cores. */ + +/* read Main Id register (MIDR) */ +inline static uint32_t read_midr(void) +{ + uint32_t value; + asm volatile ("mrc p15, 0, %0, c0, c0, 0" : "=r"(value)); + return value; +} + +/* read Multiprocessor Affinity Register (MPIDR) */ +inline static uint32_t read_mpidr(void) +{ + uint32_t value; + asm volatile ("mrc p15, 0, %0, c0, c0, 5" : "=r"(value)); + return value; +} + +/* wait for interrupt. */ +inline static void wfi(void) +{ + asm volatile ("wfi" : : : "memory"); +} + +/* wait for event. */ +inline static void wfe(void) +{ + asm volatile ("wfe"); +} + +/* set event (to bring up cores in WFE state). */ +inline static void sev(void) +{ + asm volatile ("sev"); +} + #endif /* __ARCH_CPU_H__ */ -- cgit v1.2.3