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>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index cdaedad3afe5..27c72ef4fd7a 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -15,7 +15,8 @@ CFLAGS_REMOVE_return_address.o = -pg
 arm64-obj-y             := cputable.o debug-monitors.o entry.o irq.o fpsimd.o   \
                            entry-fpsimd.o process.o ptrace.o setup.o signal.o   \
                            sys.o stacktrace.o time.o traps.o io.o vdso.o        \
-                           hyp-stub.o psci.o cpu_ops.o insn.o return_address.o
+                           hyp-stub.o psci.o cpu_ops.o insn.o return_address.o  \
+                           cpuinfo.o
 
 arm64-obj-$(CONFIG_COMPAT)              += sys32.o kuser32.o signal32.o         \
                                            sys_compat.o