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arm64: sysreg: replace open-coded mrs_s/msr_s with {read,write}_sysreg_s

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Similar to our {read,write}_sysreg accessors for architected, named
system registers, this patch introduces {read,write}_sysreg_s variants
that can take arbitrary sys_reg output and therefore access IMPDEF
registers or registers that unsupported by binutils.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2016-09-06 14:04:45 +01:00
parent 0e27a7fce6
commit 8a71f0c656
2 changed files with 16 additions and 5 deletions
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6
arch/arm64/include/asm/cputype.h
View File

@ -93,11 +93,7 @@
#include <asm/sysreg.h>
#define read_cpuid(reg) ({ \
u64 __val; \
asm("mrs_s %0, " __stringify(SYS_ ## reg) : "=r" (__val)); \
__val; \
})
#define read_cpuid(reg) read_sysreg_s(SYS_ ## reg)
/*
* The CPU ID never changes at run time, so we might as well tell the

15
arch/arm64/include/asm/sysreg.h
View File

@ -274,6 +274,21 @@ asm(
: : "rZ" (__val)); \
} while (0)
/*
* For registers without architectural names, or simply unsupported by
* GAS.
*/
#define read_sysreg_s(r) ({ \
u64 __val; \
asm volatile("mrs_s %0, " __stringify(r) : "=r" (__val)); \
__val; \
})
#define write_sysreg_s(v, r) do { \
u64 __val = (u64)v; \
asm volatile("msr_s " __stringify(r) ", %0" : : "rZ" (__val)); \
} while (0)
static inline void config_sctlr_el1(u32 clear, u32 set)
{
u32 val;