diff options
Diffstat (limited to 'rtemsbsd/include/vm/vm_object.h')
| -rw-r--r-- | rtemsbsd/include/vm/vm_object.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/rtemsbsd/include/vm/vm_object.h b/rtemsbsd/include/vm/vm_object.h index 936ffd88..9707a0c6 100644 --- a/rtemsbsd/include/vm/vm_object.h +++ b/rtemsbsd/include/vm/vm_object.h @@ -1 +1,16 @@ -/* EMPTY */ +#ifndef RTEMS_VM_OBJCT_H +#define RTEMS_VM_OBJCT_H + +/* + * Helpers to perform conversion between vm_object page indexes and offsets. + * IDX_TO_OFF() converts an index into an offset. + * OFF_TO_IDX() converts an offset into an index. + * OBJ_MAX_SIZE specifies the maximum page index corresponding to the + * maximum unsigned offset. + */ +#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) +#define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) +#define UOFF_TO_IDX(off) OFF_TO_IDX(off) +#define OBJ_MAX_SIZE (OFF_TO_IDX(UINT64_MAX) + 1) + +#endif |