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111 rindas
3.4 KiB
111 rindas
3.4 KiB
#ifndef __KERN_MM_VMM_H__
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#define __KERN_MM_VMM_H__
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#include <defs.h>
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#include <list.h>
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#include <memlayout.h>
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#include <sync.h>
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#include <proc.h>
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#include <sem.h>
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//pre define
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struct mm_struct;
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// the virtual continuous memory area(vma)
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struct vma_struct {
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struct mm_struct *vm_mm; // the set of vma using the same PDT
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uintptr_t vm_start; // start addr of vma
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uintptr_t vm_end; // end addr of vma
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uint32_t vm_flags; // flags of vma
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list_entry_t list_link; // linear list link which sorted by start addr of vma
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};
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#define le2vma(le, member) \
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to_struct((le), struct vma_struct, member)
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#define VM_READ 0x00000001
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#define VM_WRITE 0x00000002
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#define VM_EXEC 0x00000004
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#define VM_STACK 0x00000008
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// the control struct for a set of vma using the same PDT
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struct mm_struct {
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list_entry_t mmap_list; // linear list link which sorted by start addr of vma
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struct vma_struct *mmap_cache; // current accessed vma, used for speed purpose
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pde_t *pgdir; // the PDT of these vma
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int map_count; // the count of these vma
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void *sm_priv; // the private data for swap manager
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int mm_count; // the number ofprocess which shared the mm
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semaphore_t mm_sem; // mutex for using dup_mmap fun to duplicat the mm
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int locked_by; // the lock owner process's pid
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};
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struct vma_struct *find_vma(struct mm_struct *mm, uintptr_t addr);
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struct vma_struct *vma_create(uintptr_t vm_start, uintptr_t vm_end, uint32_t vm_flags);
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void insert_vma_struct(struct mm_struct *mm, struct vma_struct *vma);
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struct mm_struct *mm_create(void);
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void mm_destroy(struct mm_struct *mm);
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void vmm_init(void);
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int mm_map(struct mm_struct *mm, uintptr_t addr, size_t len, uint32_t vm_flags,
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struct vma_struct **vma_store);
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int do_pgfault(struct mm_struct *mm, uint32_t error_code, uintptr_t addr);
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int mm_unmap(struct mm_struct *mm, uintptr_t addr, size_t len);
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int dup_mmap(struct mm_struct *to, struct mm_struct *from);
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void exit_mmap(struct mm_struct *mm);
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uintptr_t get_unmapped_area(struct mm_struct *mm, size_t len);
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int mm_brk(struct mm_struct *mm, uintptr_t addr, size_t len);
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extern volatile unsigned int pgfault_num;
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extern struct mm_struct *check_mm_struct;
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bool user_mem_check(struct mm_struct *mm, uintptr_t start, size_t len, bool write);
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bool copy_from_user(struct mm_struct *mm, void *dst, const void *src, size_t len, bool writable);
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bool copy_to_user(struct mm_struct *mm, void *dst, const void *src, size_t len);
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bool copy_string(struct mm_struct *mm, char *dst, const char *src, size_t maxn);
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static inline int
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mm_count(struct mm_struct *mm) {
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return mm->mm_count;
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}
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static inline void
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set_mm_count(struct mm_struct *mm, int val) {
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mm->mm_count = val;
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}
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static inline int
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mm_count_inc(struct mm_struct *mm) {
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mm->mm_count += 1;
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return mm->mm_count;
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}
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static inline int
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mm_count_dec(struct mm_struct *mm) {
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mm->mm_count -= 1;
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return mm->mm_count;
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}
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static inline void
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lock_mm(struct mm_struct *mm) {
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if (mm != NULL) {
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down(&(mm->mm_sem));
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if (current != NULL) {
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mm->locked_by = current->pid;
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}
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}
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}
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static inline void
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unlock_mm(struct mm_struct *mm) {
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if (mm != NULL) {
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up(&(mm->mm_sem));
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mm->locked_by = 0;
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}
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}
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#endif /* !__KERN_MM_VMM_H__ */
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