38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
#ifndef PAGING_H
|
|
#define PAGING_G
|
|
|
|
#include <stdint.h>
|
|
#include "isr.h"
|
|
#include "tty.h"
|
|
#include "kheap.h"
|
|
|
|
typedef struct page {
|
|
uint32_t present : 1; // Presence in memory of single page
|
|
uint32_t rw : 1; // if set read write otherwise read only
|
|
uint32_t user : 1; // Supervisored mode only if cleared
|
|
uint32_t accessed : 1; // true if page has been accessed since last refresh
|
|
uint32_t dirty : 1; // Same as above for write.
|
|
uint32_t unused : 7; // unused bits
|
|
uint32_t frame : 20; // Frame address (shifted to the right)
|
|
} page_t;
|
|
|
|
typedef struct page_table {
|
|
page_t pages[1024];
|
|
} page_table_t;
|
|
|
|
typedef struct page_directory {
|
|
page_table_t *tables[1024]; // array of pointers to page tables
|
|
uint32_t tables_physical[1024]; // address of tables physical.
|
|
uint32_t physical_addr;
|
|
} page_directory_t;
|
|
|
|
// Setup the environment
|
|
void init_paging();
|
|
// Load specified page directory into CR3 register
|
|
void switch_page_directory(page_directory_t *new);
|
|
// Retrieve pointer to specified page address
|
|
page_t *get_page(uint32_t addr, int32_t make, page_directory_t *dir);
|
|
// Handle page faults
|
|
void page_fault(registers_t regs);
|
|
|
|
#endif |