blob: 681b84e80ccdc3e1343ad0bd40d1e7cf591461c1 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
#ifndef MELVIX_PAGING_H
#define MELVIX_PAGING_H
#include <stdint.h>
#include "../interrupts/interrupts.h"
typedef struct page {
uint32_t present : 1; // Page present in memory
uint32_t rw : 1; // Read-only if clear, readwrite if set
uint32_t user : 1; // Supervisor level only if clear
uint32_t accessed : 1; // Has the page been accessed since last refresh?
uint32_t dirty : 1; // Has the page been written to since last refresh?
uint32_t unused : 7; // Amalgamation of unused and reserved bits
uint32_t frame : 20; // Frame address (shifted right 12 bits)
} 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;
/**
* Initialize the environment and enable paging
*/
void initialise_paging();
/**
* Enable paging bit in CR0 (without initializing)
*/
void enable_paging();
/**
* Disable paging bit in CR0
*/
void disable_paging();
/**
* Load the page directory into the CR3 register
* @param new The page directory
*/
void switch_page_directory(page_directory_t *new);
/**
* Get a specific page pointer
* @param address The page address
* @param make If 1 create the page first
* @param dir The page directory
* @return The page pointer
*/
page_t *get_page(uint32_t address, int make, page_directory_t *dir);
/**
* Page fault handler
* @param r The IRQ registers
*/
void page_fault(struct regs *r);
void alloc_frame(page_t *page, int is_kernel, int is_writeable);
void free_frame(page_t *page);
/**
* Copy/clone a page directory
* @param src The page directory
* @return A new page directory pointer
*/
page_directory_t *clone_directory(page_directory_t *src);
#endif
|
