diff options
Diffstat (limited to 'kernel/include/vm/vmmap.h')
| -rw-r--r-- | kernel/include/vm/vmmap.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/kernel/include/vm/vmmap.h b/kernel/include/vm/vmmap.h new file mode 100644 index 0000000..e5efba6 --- /dev/null +++ b/kernel/include/vm/vmmap.h @@ -0,0 +1,71 @@ +#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);
\ No newline at end of file |