#ifndef CRASHPOWEROS_MEMORY_H
#define CRASHPOWEROS_MEMORY_H

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

#define KHEAP_INITIAL_SIZE 0xf00000
#define KHEAP_START      0xc0000000
#define STACK_SIZE 32768

#define INDEX_FROM_BIT(a) (a / (8*4))
#define OFFSET_FROM_BIT(a) (a % (8*4))

typedef char ALIGN[16];

typedef struct page {
    uint32_t present: 1;
    uint32_t rw: 1;
    uint32_t user: 1;
    uint32_t accessed: 1;
    uint32_t dirty: 1;
    uint32_t unused: 7;
    uint32_t frame: 20;
} page_t;

typedef struct page_table {
    page_t pages[1024];
} page_table_t;

typedef struct page_directory {
    page_table_t *tables[1024];
    uint32_t tablesPhysical[1024];
    uint32_t physicalAddr;
} page_directory_t;

typedef union header {
    struct {
        uint32_t size;
        uint32_t is_free;
        union header *next;
    } s;
    ALIGN stub;
} header_t;

uint32_t memory_usage();

void *memcpy(void *dst_, const void *src_, uint32_t size);

int memcmp(const void *a_, const void *b_, uint32_t size);

void *memset(void *s, int c, size_t n);

void *memmove(void *dest, const void *src, size_t num);

void switch_page_directory(page_directory_t *dir);

page_t *get_page(uint32_t address, int make, page_directory_t *dir);

void alloc_frame(page_t *page, int is_kernel, int is_writable);

uint32_t first_frame();

void page_fault(registers_t *regs);

void flush_tlb();

void *ksbrk(int incr);

void *alloc(uint32_t size);

void kfree(void *ptr);

uint32_t kmalloc_a(uint32_t size);

uint32_t kmalloc_p(uint32_t size, uint32_t *phy);

uint32_t kmalloc(size_t size);

uint32_t kmalloc_ap(uint32_t size, uint32_t *phys);

void init_page();

#endif //CRASHPOWEROS_MEMORY_H