| /* |
| * Copyright (c) 2015, Wind River Systems, Inc. |
| * Copyright (c) 2017, Oticon A/S |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /* "Arch" bit manipulation functions in non-arch-specific C code (uses some |
| * gcc builtins) |
| */ |
| |
| #ifndef ZEPHYR_INCLUDE_ARCH_ARM_AARCH64_SYS_IO_H_ |
| #define ZEPHYR_INCLUDE_ARCH_ARM_AARCH64_SYS_IO_H_ |
| |
| #ifndef _ASMLANGUAGE |
| |
| #include <zephyr/types.h> |
| #include <sys/sys_io.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* Memory mapped registers I/O functions */ |
| |
| /* |
| * We need to use explicit assembler instruction there, because with classic |
| * "volatile pointer" approach compiler might generate instruction with |
| * immediate value like |
| * |
| * str w4, [x1], #4 |
| * |
| * Such instructions produce invalid syndrome in HSR register, so hypervisor |
| * can't emulate MMIO when it traps memory access. |
| */ |
| static ALWAYS_INLINE uint8_t sys_read8(mem_addr_t addr) |
| { |
| uint8_t val; |
| |
| __asm__ volatile("ldrb %w0, [%1]" : "=r" (val) : "r" (addr)); |
| |
| __DMB(); |
| return val; |
| } |
| |
| static ALWAYS_INLINE void sys_write8(uint8_t data, mem_addr_t addr) |
| { |
| __DMB(); |
| __asm__ volatile("strb %w0, [%1]" : : "r" (data), "r" (addr)); |
| } |
| |
| static ALWAYS_INLINE uint16_t sys_read16(mem_addr_t addr) |
| { |
| uint16_t val; |
| |
| __asm__ volatile("ldrh %w0, [%1]" : "=r" (val) : "r" (addr)); |
| |
| __DMB(); |
| return val; |
| } |
| |
| static ALWAYS_INLINE void sys_write16(uint16_t data, mem_addr_t addr) |
| { |
| __DMB(); |
| __asm__ volatile("strh %w0, [%1]" : : "r" (data), "r" (addr)); |
| } |
| |
| static ALWAYS_INLINE uint32_t sys_read32(mem_addr_t addr) |
| { |
| uint32_t val; |
| |
| __asm__ volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr)); |
| |
| __DMB(); |
| return val; |
| } |
| |
| static ALWAYS_INLINE void sys_write32(uint32_t data, mem_addr_t addr) |
| { |
| __DMB(); |
| __asm__ volatile("str %w0, [%1]" : : "r" (data), "r" (addr)); |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _ASMLANGUAGE */ |
| |
| #endif /* ZEPHYR_INCLUDE_ARCH_ARM_AARCH64_SYS_IO_H_ */ |