lib/arm64/asm/sysreg.h

/*
 * Ripped off from arch/arm64/include/asm/sysreg.h
 *
 * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.
 */
#ifndef _ASMARM64_SYSREG_H_
#define _ASMARM64_SYSREG_H_

#define sys_reg(op0, op1, crn, crm, op2) \
	((((op0)&3)<<19)|((op1)<<16)|((crn)<<12)|((crm)<<8)|((op2)<<5))

#ifdef __ASSEMBLY__
	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
	.equ	.L__reg_num_x\num, \num
	.endr
	.equ	.L__reg_num_xzr, 31

	.macro	mrs_s, rt, sreg
	.inst	0xd5200000|(\sreg)|(.L__reg_num_\rt)
	.endm

	.macro	msr_s, sreg, rt
	.inst	0xd5000000|(\sreg)|(.L__reg_num_\rt)
	.endm
#else
#include <libcflat.h>

#define read_sysreg(r) ({					\
	u64 __val;						\
	asm volatile("mrs %0, " xstr(r) : "=r" (__val));	\
	__val;							\
})

#define write_sysreg(v, r) do {					\
	u64 __val = (u64)v;					\
	asm volatile("msr " xstr(r) ", %x0" : : "rZ" (__val));	\
} while (0)

#define read_sysreg_s(r) ({					\
	u64 __val;						\
	asm volatile("mrs_s %0, " xstr(r) : "=r" (__val));	\
	__val;							\
})

#define write_sysreg_s(v, r) do {				\
	u64 __val = (u64)v;					\
	asm volatile("msr_s " xstr(r) ", %x0" : : "rZ" (__val));\
} while (0)

#define write_regn_el0(__reg, __n, __val) \
	write_sysreg((__val), __reg ## __n ## _el0)

#define read_regn_el0(__reg, __n) \
	read_sysreg(__reg ## __n ## _el0)

asm(
"	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
"	.equ	.L__reg_num_x\\num, \\num\n"
"	.endr\n"
"	.equ	.L__reg_num_xzr, 31\n"
"\n"
"	.macro	mrs_s, rt, sreg\n"
"	.inst	0xd5200000|(\\sreg)|(.L__reg_num_\\rt)\n"
"	.endm\n"
"\n"
"	.macro	msr_s, sreg, rt\n"
"	.inst	0xd5000000|(\\sreg)|(.L__reg_num_\\rt)\n"
"	.endm\n"
);
#endif /* __ASSEMBLY__ */
#endif /* _ASMARM64_SYSREG_H_ */