1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * Copyright (c) 2019, Linaro Limited 4 */ 5 #ifndef ARM64_USER_SYSREG_H 6 #define ARM64_USER_SYSREG_H 7 8 #include <compiler.h> 9 #include <stdint.h> 10 11 /* 12 * Templates for register read/write functions based on mrs/msr 13 */ 14 15 #define DEFINE_REG_READ_FUNC_(reg, type, asmreg) \ 16 static inline __noprof type read_##reg(void) \ 17 { \ 18 type val; \ 19 \ 20 asm volatile("mrs %0, " #asmreg : "=r" (val)); \ 21 return val; \ 22 } 23 24 #define DEFINE_REG_WRITE_FUNC_(reg, type, asmreg) \ 25 static inline __noprof void write_##reg(type val) \ 26 { \ 27 asm volatile("msr " #asmreg ", %0" : : "r" (val)); \ 28 } 29 30 /* ARM Generic timer functions */ 31 DEFINE_REG_READ_FUNC_(cntfrq, uint32_t, cntfrq_el0) 32 DEFINE_REG_READ_FUNC_(cntpct, uint64_t, cntpct_el0) 33 34 #endif /*ARM64_USER_SYSREG_H*/ 35