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- #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
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