add lab answers

labcodes_answer/lab5_result/kern/mm/swap.h

@@ -0,0 +1,65 @@
+#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