1 /* 2 * Paging utilities. 3 * 4 * Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "paging.h" 21 #include "memory.h" 22 23 inline u32 user_address(u32 addr) 24 { 25 return addr & USER_ADDRESS_MASK; 26 } 27 28 inline u32 previous_page(u32 addr, u32 pagesize) 29 { 30 return addr - pagesize * 2; 31 } 32 33 inline u32 next_page(u32 addr, u32 pagesize) 34 { 35 return addr + pagesize * 2; 36 } 37 38 inline u32 page_size(u32 size) 39 { 40 return size / 2; 41 }