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#pragma once
#include "types.h"
#include "util/list.h"
#define VMMAP_DIR_LOHI 1
#define VMMAP_DIR_HILO 2
struct mobj;
struct proc;
struct vnode;
typedef struct vmmap
{
list_t vmm_list; /* list of virtual memory areas */
struct proc *vmm_proc; /* the process that corresponds to this vmmap */
} vmmap_t;
/* Make sure you understand why mapping boundaries are in terms of frame
* numbers (page numbers) and not addresses */
typedef struct vmarea
{
size_t vma_start; /* [starting vfn, */
size_t vma_end; /* ending vfn) */
size_t vma_off; /* offset from beginning of vma_obj in pages */
/* the reason this field is necessary is that
when files are mmap'ed, it doesn't have
to start from location 0. You could, for instance,
map pages 10-15 of a file, and vma_off would be 10. */
int vma_prot; /* permissions (protections) on mapping, see mman.h */
int vma_flags; /* either MAP_SHARED or MAP_PRIVATE. It can also specify
MAP_ANON and MAP_FIXED */
struct vmmap *vma_vmmap; /* address space that this area belongs to */
struct mobj *vma_obj; /* the memory object that corresponds to this address region */
list_link_t vma_plink; /* link on process vmmap maps list */
} vmarea_t;
void vmmap_init(void);
vmmap_t *vmmap_create(void);
void vmmap_destroy(vmmap_t **mapp);
void vmmap_collapse(vmmap_t *map);
vmarea_t *vmmap_lookup(vmmap_t *map, size_t vfn);
long vmmap_map(vmmap_t *map, struct vnode *file, size_t lopage, size_t npages,
int prot, int flags, off_t off, int dir, vmarea_t **new_vma);
long vmmap_remove(vmmap_t *map, size_t lopage, size_t npages);
long vmmap_is_range_empty(vmmap_t *map, size_t startvfn, size_t npages);
ssize_t vmmap_find_range(vmmap_t *map, size_t npages, int dir);
long vmmap_read(vmmap_t *map, const void *vaddr, void *buf, size_t count);
long vmmap_write(vmmap_t *map, void *vaddr, const void *buf, size_t count);
vmmap_t *vmmap_clone(vmmap_t *map);
size_t vmmap_mapping_info_helper(const void *map, char *buf, size_t size,
char *prompt);
size_t vmmap_mapping_info(const void *map, char *buf, size_t size);
void vmmap_insert(vmmap_t *map, vmarea_t *new_vma);
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