smol-gilbraltar/include/mem.h

#ifndef __GILBRALTAR_MEM__
#define __GILBRALTAR_MEM__

#include <stddef.h>
#include <stdint.h>

static inline uint8_t read8(uintptr_t addr) {
  return *(uint8_t volatile *)addr;
}

static inline void write8(uintptr_t addr, uint8_t v) {
  *(uint8_t volatile *)addr = v;
}

static inline uint32_t read32(uintptr_t addr) {
  return *(uint32_t volatile *)addr;
}

static inline void write32(uintptr_t addr, uint32_t v) {
  *(uint32_t volatile *)addr = v;
}

#define data_sync_barrier() __asm__ __volatile("dsb sy" ::: "memory")
#define data_mem_barrier() __asm__ __volatile("dmb sy" ::: "memory")
#define instruction_sync_barrier() __asm__ __volatile("isb" ::: "memory")

#endif