From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Fri, 9 Sep 2016 12:16:00 +0100 Subject: [PATCH 1/6] arm64: sysreg: replace open-coded mrs_s/msr_s with {read, write}_sysreg_s In-Reply-To: <1473419765-3437-1-git-send-email-will.deacon@arm.com> References: <1473419765-3437-1-git-send-email-will.deacon@arm.com> Message-ID: <1473419765-3437-2-git-send-email-will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. Signed-off-by: Will Deacon --- arch/arm64/include/asm/cputype.h | 6 +----- arch/arm64/include/asm/sysreg.h | 16 ++++++++++++++++ 2 files changed, 17 insertions(+), 5 deletions(-) diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 9d9fd4b9a72e..26a68ddb11c1 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -93,11 +93,7 @@ #include -#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 diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index cc06794b7346..10d76d417d17 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -279,6 +279,22 @@ static inline void config_sctlr_el1(u32 clear, u32 set) : : "r" (__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" \ + : : "r" (__val)); \ +} while (0) + #endif #endif /* __ASM_SYSREG_H */ -- 2.1.4