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