Richard Henderson | 44b99a6 | 2021-03-22 12:24:26 +0100 | [diff] [blame] | 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 | } |