diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2014-07-16 16:32:44 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-07-18 15:24:09 +0100 |
| commit | df857416a13734ed9356f6e4f0152d55e4fb748a (patch) | |
| tree | c18089d69b5ecc00ba4d2828899801ac5cadb270 /arch/arm64/kernel/smp.c | |
| parent | 89c4a306e7631bcb71cc537c8a029172af6047fe (diff) | |
arm64: cpuinfo: record cpu system register values
Several kernel subsystems need to know details about CPU system register
values, sometimes for CPUs other than that they are executing on. Rather
than hard-coding system register accesses and cross-calls for these
cases, this patch adds logic to record various system register values at
boot-time. This may be used for feature reporting, firmware bug
detection, etc.
Separate hooks are added for the boot and hotplug paths to enable
one-time intialisation and cold/warm boot value mismatch detection in
later patches.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/smp.c')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 40f38f46c8e0..3e2f5ebbf63e 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -39,6 +39,7 @@ #include <asm/atomic.h> #include <asm/cacheflush.h> +#include <asm/cpu.h> #include <asm/cputype.h> #include <asm/cpu_ops.h> #include <asm/mmu_context.h> @@ -155,6 +156,11 @@ asmlinkage void secondary_start_kernel(void) cpu_ops[cpu]->cpu_postboot(); /* + * Log the CPU info before it is marked online and might get read. + */ + cpuinfo_store_cpu(); + + /* * Enable GIC and timers. */ notify_cpu_starting(cpu); |