//! i86 architecture defines 1024 entries per table--do not change
#define PAGES_PER_TABLE 1024
#define PAGES_PER_DIR	1024

#define PAGE_DIRECTORY_INDEX(x) (((x) >> 22) & 0x3ff)
#define PAGE_TABLE_INDEX(x) (((x) >> 12) & 0x3ff)
#define PAGE_GET_PHYSICAL_ADDRESS(x) (*x & ~0xfff)

//! page table represents 4mb address space
#define PTABLE_ADDR_SPACE_SIZE 0x400000

//! directory table represents 4gb address space
#define DTABLE_ADDR_SPACE_SIZE 0x100000000

//! page sizes are 4k
#define PAGE_SIZE 4096
 
//! page table entry
typedef uint32_t pt_entry;

//! a page directery entry
typedef uint32_t pd_entry;


//! page table
typedef struct ptable_struct {
 
    pt_entry m_entries[PAGES_PER_TABLE];
}ptable ;
 
//! page directory
typedef struct pdirectory_struct {
 
    pd_entry m_entries[PAGES_PER_DIR];
}pdirectory;

pdirectory* vmem_init(uint32_t kernel_blocks);