Commit 1c5d3a1e authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
Browse files

KVM: LoongArch: selftests: Add basic interfaces 



Add some basic function interfaces such as CSR register access, local
irq enable or disable APIs.

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 985a9698

tools/testing/selftests/kvm/include/loongarch/processor.h

+50 −0
Original line number Diff line number Diff line
@@ -113,6 +113,28 @@ 
#define  CSR_TLBREHI_PS_SHIFT		0

#define  CSR_TLBREHI_PS			(0x3fUL << CSR_TLBREHI_PS_SHIFT)



#define csr_read(csr)				\

({						\

	register unsigned long __v;		\

	__asm__ __volatile__(			\

		"csrrd %[val], %[reg]\n\t"	\

		: [val] "=r" (__v)		\

		: [reg] "i" (csr)		\

		: "memory");			\

	__v;					\

})



#define csr_write(v, csr)			\

({						\

	register unsigned long __v = v;		\

	__asm__ __volatile__ (			\

		"csrwr %[val], %[reg]\n\t"	\

		: [val] "+r" (__v)		\

		: [reg] "i" (csr)		\

		: "memory");			\

	__v;					\

})



#define EXREGS_GPRS			(32)



#ifndef __ASSEMBLER__
@@ -133,6 +155,34 @@ struct ex_regs { 
#define PRMD_OFFSET_EXREGS		offsetof(struct ex_regs, prmd)

#define EXREGS_SIZE			sizeof(struct ex_regs)



static inline void cpu_relax(void)

{

	asm volatile("nop" ::: "memory");

}



static inline void local_irq_enable(void)

{

	unsigned int flags = CSR_CRMD_IE;

	register unsigned int mask asm("$t0") = CSR_CRMD_IE;



	__asm__ __volatile__(

		"csrxchg %[val], %[mask], %[reg]\n\t"

		: [val] "+r" (flags)

		: [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)

		: "memory");

}



static inline void local_irq_disable(void)

{

	unsigned int flags = 0;

	register unsigned int mask asm("$t0") = CSR_CRMD_IE;



	__asm__ __volatile__(

		"csrxchg %[val], %[mask], %[reg]\n\t"

		: [val] "+r" (flags)

		: [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)

		: "memory");

}

#else

#define PC_OFFSET_EXREGS		((EXREGS_GPRS + 0) * 8)

#define ESTAT_OFFSET_EXREGS		((EXREGS_GPRS + 1) * 8)

tools/testing/selftests/kvm/lib/loongarch/processor.c

+5 −0
Original line number Diff line number Diff line
@@ -192,6 +192,11 @@ void route_exception(struct ex_regs *regs) 
	while (1) ;

}



uint32_t guest_get_vcpuid(void)

{

	return csr_read(LOONGARCH_CSR_CPUID);

}



void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)

{

	int i;