| Bits | Meaning when set |
|---|---|
| 0-7 | 0 |
| 8 | Physical page number provided |
| 9 | Logical address provided |
| 10 | Physical address provided |
| 11 | Return physical page number (if bit 8 clear) |
| 12 | Return logical address (if bit 9 clear) |
| 13 | Return physical address (if bit 10 clear) |
| 14-15 | Cacheability control: |
| 0,1 = No change | |
| 2 = Disable cacheing on all specified pages | |
| 3 = Enable cacheing on all specified pages | |
| 16-31 | Reserved, must be clear |
These flags are specific to OS_Memory 0.