From: Mark Rutland <mark.rutl...@arm.com>
Rather than crafting custom macros for reading/writing each system
register provide generics accessors, read_sysreg and write_sysreg, for
this purpose.
Unlike read_cpuid, calls to read_exception_reg are never expected
to be optimized away or replaced with synthetic values.
Signed-off-by: Mark Rutland <mark.rutl...@arm.com>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Marc Zyngier <marc.zyng...@arm.com>
Cc: Suzuki Poulose <suzuki.poul...@arm.com>
Cc: Will Deacon <will.dea...@arm.com>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
arch/arm64/include/asm/sysreg.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index d48ab5b..c9c283a 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -20,6 +20,8 @@
#ifndef __ASM_SYSREG_H
#define __ASM_SYSREG_H
+#include <linux/stringify.h>
+
#include <asm/opcodes.h>
/*
@@ -208,6 +210,8 @@
#else
+#include <linux/types.h>
+
asm(
" .irp
num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
" .equ __reg_num_x\\num, \\num\n"
@@ -232,6 +236,19 @@ static inline void config_sctlr_el1(u32 clear, u32 set)
val |= set;
asm volatile("msr sctlr_el1, %0" : : "r" (val));
}
+
+#define read_sysreg(r) ({ \
+ u64 __val; \
+ asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \
+ __val; \
+})
+
+#define write_sysreg(v, r) do { \
+ u64 __val = (u64)v; \
+ asm volatile("msr " __stringify(r) ", %0" \
+ : : "r" (__val)); \
+} while (0)
+
#endif
#endif /* __ASM_SYSREG_H */
--
2.1.4
--
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