#pragma once
/* Virtual memory management header */

#include "cdef.h"
#include "memory_layout.h"
#include "llist.h"
#include "pmm.h"
#include "spin_lock.h"

typedef uintptr vaddr;
typedef struct llist vmll;
typedef struct llist_node vm_node;

typedef struct virtual_page
{
    vaddr address; // Init to 0x0
    vaddr table_ptr;
    vmll allocs; // Linked list of vm_atom
    uint64 free;
    uint8 status;
} vm_object;

typedef struct allocation
{
    usize offset;
    usize size;
    vm_object *page_ptr;
} vm_atom;

typedef struct page_table
{
    uint64 id;
    usize size;
    usize free;
    vm_atom *map;
} vm_unit;

typedef struct allocation_sector
{
    uint64 start;
    uint64 end;
    vm_object **actbck;
    vm_object **resbck;
    vm_object *largest_free;
    uint16 dirty;
} vm_sector;

typedef struct page_table_entries
{
    vm_unit *groups;
    vm_sector sectors[3];
    vm_object *pages;

    vmll *global_alloc;
    usize free_frames;
} vmem;

void init_vm();

void vm_issue_unit(uint64 id, usize size);

void *kalloc(usize size);

void kfree(void *ptr);