#pragma once

#include "src/panic.h"
#include <stdint.h>

void memory_init();

void *memory_allocate(uint64_t size);

void memory_free(void *pointer);

static inline void memory_set(uint8_t value, uint64_t bytes, void *to) {
  __asm__ volatile("rep stosb" : "=D"(to), "=c"(bytes) : "D"(to), "a"(value), "c"(bytes) : "memory");
}

static inline void memory_move(void *from, uint64_t bytes, void *to) {
  if (to == from) {
    return;
  } else if (to < from) {
    __asm__ volatile("rep movsb" : "=D"(to), "=S"(from), "=c"(bytes) : "D"(to), "S"(from), "c"(bytes) : "memory");
  } else {
    ASSERT(0, "memory_move: forward overlapping move not implemented");
  }
}

static inline void memory_copy(const void *from, uint64_t bytes, void *to) {
  ASSERT((uint64_t)to + bytes <= (uint64_t)from || (uint64_t)to >= (uint64_t)from + bytes, "memory_copy: overlapping backward copy");

  __asm__ volatile("rep movsb" : "=D"(to), "=S"(from), "=c"(bytes) : "D"(to), "S"(from), "c"(bytes) : "memory");
}