280 lines
7.4 KiB
C
280 lines
7.4 KiB
C
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#include <swap.h>
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#include <swapfs.h>
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#include <swap_fifo.h>
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#include <stdio.h>
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#include <string.h>
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#include <memlayout.h>
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#include <pmm.h>
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#include <mmu.h>
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// the valid vaddr for check is between 0~CHECK_VALID_VADDR-1
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#define CHECK_VALID_VIR_PAGE_NUM 5
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#define BEING_CHECK_VALID_VADDR 0X1000
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#define CHECK_VALID_VADDR (CHECK_VALID_VIR_PAGE_NUM+1)*0x1000
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// the max number of valid physical page for check
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#define CHECK_VALID_PHY_PAGE_NUM 4
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// the max access seq number
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#define MAX_SEQ_NO 10
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static struct swap_manager *sm;
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size_t max_swap_offset;
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volatile int swap_init_ok = 0;
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unsigned int swap_page[CHECK_VALID_VIR_PAGE_NUM];
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unsigned int swap_in_seq_no[MAX_SEQ_NO],swap_out_seq_no[MAX_SEQ_NO];
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static void check_swap(void);
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int
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swap_init(void)
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{
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swapfs_init();
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if (!(1024 <= max_swap_offset && max_swap_offset < MAX_SWAP_OFFSET_LIMIT))
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{
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panic("bad max_swap_offset %08x.\n", max_swap_offset);
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}
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sm = &swap_manager_fifo;
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int r = sm->init();
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if (r == 0)
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{
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swap_init_ok = 1;
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cprintf("SWAP: manager = %s\n", sm->name);
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check_swap();
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}
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return r;
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}
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int
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swap_init_mm(struct mm_struct *mm)
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{
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return sm->init_mm(mm);
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}
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int
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swap_tick_event(struct mm_struct *mm)
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{
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return sm->tick_event(mm);
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}
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int
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swap_map_swappable(struct mm_struct *mm, uintptr_t addr, struct Page *page, int swap_in)
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{
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return sm->map_swappable(mm, addr, page, swap_in);
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}
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int
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swap_set_unswappable(struct mm_struct *mm, uintptr_t addr)
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{
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return sm->set_unswappable(mm, addr);
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}
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volatile unsigned int swap_out_num=0;
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int
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swap_out(struct mm_struct *mm, int n, int in_tick)
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{
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int i;
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for (i = 0; i != n; ++ i)
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{
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uintptr_t v;
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//struct Page **ptr_page=NULL;
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struct Page *page;
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// cprintf("i %d, SWAP: call swap_out_victim\n",i);
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int r = sm->swap_out_victim(mm, &page, in_tick);
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if (r != 0) {
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cprintf("i %d, swap_out: call swap_out_victim failed\n",i);
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break;
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}
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assert(!PageReserved(page));
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//cprintf("SWAP: choose victim page 0x%08x\n", page);
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v=page->pra_vaddr;
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pte_t *ptep = get_pte(mm->pgdir, v, 0);
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assert((*ptep & PTE_P) != 0);
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if (swapfs_write( (page->pra_vaddr/PGSIZE+1)<<8, page) != 0) {
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cprintf("SWAP: failed to save\n");
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sm->map_swappable(mm, v, page, 0);
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continue;
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}
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else {
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cprintf("swap_out: i %d, store page in vaddr 0x%x to disk swap entry %d\n", i, v, page->pra_vaddr/PGSIZE+1);
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*ptep = (page->pra_vaddr/PGSIZE+1)<<8;
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free_page(page);
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}
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tlb_invalidate(mm->pgdir, v);
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}
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return i;
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}
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int
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swap_in(struct mm_struct *mm, uintptr_t addr, struct Page **ptr_result)
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{
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struct Page *result = alloc_page();
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assert(result!=NULL);
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pte_t *ptep = get_pte(mm->pgdir, addr, 0);
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// cprintf("SWAP: load ptep %x swap entry %d to vaddr 0x%08x, page %x, No %d\n", ptep, (*ptep)>>8, addr, result, (result-pages));
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int r;
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if ((r = swapfs_read((*ptep), result)) != 0)
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{
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assert(r!=0);
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}
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cprintf("swap_in: load disk swap entry %d with swap_page in vadr 0x%x\n", (*ptep)>>8, addr);
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*ptr_result=result;
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return 0;
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}
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static inline void
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check_content_set(void)
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{
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*(unsigned char *)0x1000 = 0x0a;
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assert(pgfault_num==1);
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*(unsigned char *)0x1010 = 0x0a;
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assert(pgfault_num==1);
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*(unsigned char *)0x2000 = 0x0b;
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assert(pgfault_num==2);
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*(unsigned char *)0x2010 = 0x0b;
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assert(pgfault_num==2);
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*(unsigned char *)0x3000 = 0x0c;
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assert(pgfault_num==3);
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*(unsigned char *)0x3010 = 0x0c;
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assert(pgfault_num==3);
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*(unsigned char *)0x4000 = 0x0d;
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assert(pgfault_num==4);
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*(unsigned char *)0x4010 = 0x0d;
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assert(pgfault_num==4);
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}
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static inline int
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check_content_access(void)
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{
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int ret = sm->check_swap();
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return ret;
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}
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struct Page * check_rp[CHECK_VALID_PHY_PAGE_NUM];
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pte_t * check_ptep[CHECK_VALID_PHY_PAGE_NUM];
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unsigned int check_swap_addr[CHECK_VALID_VIR_PAGE_NUM];
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extern free_area_t free_area;
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#define free_list (free_area.free_list)
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#define nr_free (free_area.nr_free)
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static void
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check_swap(void)
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{
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//backup mem env
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int ret, count = 0, total = 0, i;
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list_entry_t *le = &free_list;
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while ((le = list_next(le)) != &free_list) {
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struct Page *p = le2page(le, page_link);
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assert(PageProperty(p));
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count ++, total += p->property;
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}
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assert(total == nr_free_pages());
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cprintf("BEGIN check_swap: count %d, total %d\n",count,total);
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//now we set the phy pages env
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struct mm_struct *mm = mm_create();
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assert(mm != NULL);
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extern struct mm_struct *check_mm_struct;
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assert(check_mm_struct == NULL);
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check_mm_struct = mm;
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pde_t *pgdir = mm->pgdir = boot_pgdir;
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assert(pgdir[0] == 0);
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struct vma_struct *vma = vma_create(BEING_CHECK_VALID_VADDR, CHECK_VALID_VADDR, VM_WRITE | VM_READ);
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assert(vma != NULL);
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insert_vma_struct(mm, vma);
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//setup the temp Page Table vaddr 0~4MB
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cprintf("setup Page Table for vaddr 0X1000, so alloc a page\n");
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pte_t *temp_ptep=NULL;
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temp_ptep = get_pte(mm->pgdir, BEING_CHECK_VALID_VADDR, 1);
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assert(temp_ptep!= NULL);
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cprintf("setup Page Table vaddr 0~4MB OVER!\n");
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for (i=0;i<CHECK_VALID_PHY_PAGE_NUM;i++) {
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check_rp[i] = alloc_page();
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assert(check_rp[i] != NULL );
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assert(!PageProperty(check_rp[i]));
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}
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list_entry_t free_list_store = free_list;
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list_init(&free_list);
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assert(list_empty(&free_list));
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//assert(alloc_page() == NULL);
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unsigned int nr_free_store = nr_free;
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nr_free = 0;
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for (i=0;i<CHECK_VALID_PHY_PAGE_NUM;i++) {
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free_pages(check_rp[i],1);
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}
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assert(nr_free==CHECK_VALID_PHY_PAGE_NUM);
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cprintf("set up init env for check_swap begin!\n");
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//setup initial vir_page<->phy_page environment for page relpacement algorithm
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pgfault_num=0;
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check_content_set();
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assert( nr_free == 0);
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for(i = 0; i<MAX_SEQ_NO ; i++)
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swap_out_seq_no[i]=swap_in_seq_no[i]=-1;
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for (i= 0;i<CHECK_VALID_PHY_PAGE_NUM;i++) {
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check_ptep[i]=0;
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check_ptep[i] = get_pte(pgdir, (i+1)*0x1000, 0);
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//cprintf("i %d, check_ptep addr %x, value %x\n", i, check_ptep[i], *check_ptep[i]);
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assert(check_ptep[i] != NULL);
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assert(pte2page(*check_ptep[i]) == check_rp[i]);
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assert((*check_ptep[i] & PTE_P));
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}
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cprintf("set up init env for check_swap over!\n");
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// now access the virt pages to test page relpacement algorithm
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ret=check_content_access();
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assert(ret==0);
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//restore kernel mem env
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for (i=0;i<CHECK_VALID_PHY_PAGE_NUM;i++) {
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free_pages(check_rp[i],1);
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}
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//free_page(pte2page(*temp_ptep));
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mm_destroy(mm);
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nr_free = nr_free_store;
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free_list = free_list_store;
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le = &free_list;
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while ((le = list_next(le)) != &free_list) {
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struct Page *p = le2page(le, page_link);
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count --, total -= p->property;
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}
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assert(count == 0);
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cprintf("check_swap() succeeded!\n");
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}
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