/*
Copyright 2019 Benji Dial

Permission to use, copy, modify, and/or distribute this
software for any purpose with or without fee is hereby
granted, provided that the above copyright notice and this
permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS
ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
*/

#include <stdint.h>

#ifndef MEM_H
#define MEM_H

enum special_mmap_codes {
  FREE     = 0,
  HARDWARE = 1,
  KERNEL   = 2
};

struct mmap_entry {
  uint32_t base;
  uint32_t length;
  uint16_t whose;
  struct mmap_entry *after;
  struct mmap_entry *before;
};

#define MMAP_SIZE 65536
struct mmap_entry *mmap_start;
struct mmap_entry mmap_bss[MMAP_SIZE];
uint32_t mmap_bitmap[MMAP_SIZE / 32];
#define unmark_entry(entry) (mmap_bitmap[((entry) - mmap_bss) >> 5] ^= 1 << (((entry) - mmap_bss) & 0x0000001f))
void *allocate_block(uint32_t size, uint16_t proc_n);
void deallocate_block(void *start);

#endif