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Commit 3c295687 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

ARM: KVM: Add system register accessor macros 



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.

Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 08dcbfda

arch/arm/kvm/hyp/hyp.h

+15 −0
Original line number Diff line number Diff line
@@ -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__ */