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| author | Hung-Te Lin <hungte@chromium.org> | 2013-08-08 11:27:27 +0800 |
|---|---|---|
| committer | Patrick Georgi <patrick@georgi-clan.de> | 2013-12-21 22:45:57 +0100 |
| commit | 93951f4ed8b15c7140961a24d7fa756e3ec204ff (patch) | |
| tree | 8c2fcc24f392a3d044e3c261106781713484540a /src | |
| parent | 792b621ac03cb0d0eab065374f912a103a7b4080 (diff) | |
| download | coreboot-93951f4ed8b15c7140961a24d7fa756e3ec204ff.tar.xz | |
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 <hungte@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65112
Reviewed-on: http://review.coreboot.org/4444
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/armv7/include/arch/cpu.h | 36 |
1 files changed, 36 insertions, 0 deletions
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__ */ |