《操作系统》的实验代码。
 
 
 
 
 

65 lines
2.4 KiB

#ifndef __KERN_MM_SWAP_H__
#define __KERN_MM_SWAP_H__
#include <defs.h>
#include <memlayout.h>
#include <pmm.h>
#include <vmm.h>
/* *
* swap_entry_t
* --------------------------------------------
* | offset | reserved | 0 |
* --------------------------------------------
* 24 bits 7 bits 1 bit
* */
#define MAX_SWAP_OFFSET_LIMIT (1 << 24)
extern size_t max_swap_offset;
/* *
* swap_offset - takes a swap_entry (saved in pte), and returns
* the corresponding offset in swap mem_map.
* */
#define swap_offset(entry) ({ \
size_t __offset = (entry >> 8); \
if (!(__offset > 0 && __offset < max_swap_offset)) { \
panic("invalid swap_entry_t = %08x.\n", entry); \
} \
__offset; \
})
struct swap_manager
{
const char *name;
/* Global initialization for the swap manager */
int (*init) (void);
/* Initialize the priv data inside mm_struct */
int (*init_mm) (struct mm_struct *mm);
/* Called when tick interrupt occured */
int (*tick_event) (struct mm_struct *mm);
/* Called when map a swappable page into the mm_struct */
int (*map_swappable) (struct mm_struct *mm, uintptr_t addr, struct Page *page, int swap_in);
/* When a page is marked as shared, this routine is called to
* delete the addr entry from the swap manager */
int (*set_unswappable) (struct mm_struct *mm, uintptr_t addr);
/* Try to swap out a page, return then victim */
int (*swap_out_victim) (struct mm_struct *mm, struct Page **ptr_page, int in_tick);
/* check the page relpacement algorithm */
int (*check_swap)(void);
};
extern volatile int swap_init_ok;
int swap_init(void);
int swap_init_mm(struct mm_struct *mm);
int swap_tick_event(struct mm_struct *mm);
int swap_map_swappable(struct mm_struct *mm, uintptr_t addr, struct Page *page, int swap_in);
int swap_set_unswappable(struct mm_struct *mm, uintptr_t addr);
int swap_out(struct mm_struct *mm, int n, int in_tick);
int swap_in(struct mm_struct *mm, uintptr_t addr, struct Page **ptr_result);
//#define MEMBER_OFFSET(m,t) ((int)(&((t *)0)->m))
//#define FROM_MEMBER(m,t,a) ((t *)((char *)(a) - MEMBER_OFFSET(m,t)))
#endif