Ucore_lab3相关

• 优秀的博客：https://kiprey.github.io/2020/08/uCore-3/
• 实验指导书：https://learningos.github.io/ucore_os_webdocs/lab3.html

虚拟内存管理

关键的一些结构：

struct vma_struct {
    // the set of vma using the same PDT
    struct mm_struct *vm_mm;
    uintptr_t vm_start; // start addr of vma
    uintptr_t vm_end; // end addr of vma
    uint32_t vm_flags; // flags of vma
    //linear list link which sorted by start addr of vma
    list_entry_t list_link;
};

struct mm_struct {
    // linear list link which sorted by start addr of vma
    list_entry_t mmap_list;
    // current accessed vma, used for speed purpose
    struct vma_struct *mmap_cache;
    pde_t *pgdir; // the PDT of these vma
    int map_count; // the count of these vma
    void *sm_priv; // the private data for swap manager
};

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);
};

其他内容见博客和指导书以及源码。