[PATCH v2 07/28] ARM: KVM: Add system register accessor macros
From: Marc Zyngier <hidden>
Date: 2016-02-04 11:00:24
Also in:
kvm, kvmarm
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
In order to move system register (CP15, mostly) access to C code, add a few macros to facilitate this, and minimize the difference between 32 and 64bit CP15 registers. This will get heavily used in the following patches. Signed-off-by: Marc Zyngier <redacted> --- arch/arm/kvm/hyp/hyp.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/arch/arm/kvm/hyp/hyp.h b/arch/arm/kvm/hyp/hyp.h
index c723870..727089f 100644
--- a/arch/arm/kvm/hyp/hyp.h
+++ b/arch/arm/kvm/hyp/hyp.h@@ -27,4 +27,19 @@ #define kern_hyp_va(v) (v) #define hyp_kern_va(v) (v) +#define __ACCESS_CP15(CRn, Op1, CRm, Op2) \ + "mrc", "mcr", __stringify(p15, Op1, %0, CRn, CRm, Op2), u32 +#define __ACCESS_CP15_64(Op1, CRm) \ + "mrrc", "mcrr", __stringify(p15, Op1, %Q0, %R0, CRm), u64 + +#define __write_sysreg(v, r, w, c, t) asm volatile(w " " c : : "r" ((t)(v))) +#define write_sysreg(v, ...) __write_sysreg(v, __VA_ARGS__) + +#define __read_sysreg(r, w, c, t) ({ \ + t __val; \ + asm volatile(r " " c : "=r" (__val)); \ + __val; \ +}) +#define read_sysreg(...) __read_sysreg(__VA_ARGS__) + #endif /* __ARM_KVM_HYP_H__ */
--
2.1.4