1 /* 2 * Variable page size handling -- target independent part. 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library 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 GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #define IN_PAGE_VARY 1 21 22 #include "qemu/osdep.h" 23 #include "qemu-common.h" 24 #include "exec/page-vary.h" 25 26 /* WARNING: This file must *not* be complied with -flto. */ 27 28 TargetPageBits target_page; 29 30 bool set_preferred_target_page_bits_common(int bits) 31 { 32 /* 33 * The target page size is the lowest common denominator for all 34 * the CPUs in the system, so we can only make it smaller, never 35 * larger. And we can't make it smaller once we've committed to 36 * a particular size. 37 */ 38 if (target_page.bits == 0 || target_page.bits > bits) { 39 if (target_page.decided) { 40 return false; 41 } 42 target_page.bits = bits; 43 } 44 return true; 45 } 46 47 void finalize_target_page_bits_common(int min) 48 { 49 if (target_page.bits == 0) { 50 target_page.bits = min; 51 } 52 target_page.mask = -1ull << target_page.bits; 53 target_page.decided = true; 54 } 55