| Bits 0-19: page index to map (virtual address >> 12; the physical address is determined per-page according to [[Memory layout]]); Bit 20: Map read-only (otherwise read-write) | | Bits 0-19: page index to map (virtual address >> 12; the physical address is determined per-page according to [[Memory layout]]); Bit 20: Map read-only (otherwise read-write) |