《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>
//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
// 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
};
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 do_pgfault(struct mm_struct *mm, uint32_t error_code, uintptr_t addr);
extern volatile unsigned int pgfault_num;
extern struct mm_struct *check_mm_struct;
#endif /* !__KERN_MM_VMM_H__ */