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