qemu

FORK: QEMU emulator
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page-vary-common.c (1643B)

      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 "exec/page-vary.h"
     24 
     25 /* WARNING: This file must *not* be complied with -flto. */
     26 
     27 TargetPageBits target_page;
     28 
     29 bool set_preferred_target_page_bits_common(int bits)
     30 {
     31     /*
     32      * The target page size is the lowest common denominator for all
     33      * the CPUs in the system, so we can only make it smaller, never
     34      * larger. And we can't make it smaller once we've committed to
     35      * a particular size.
     36      */
     37     if (target_page.bits == 0 || target_page.bits > bits) {
     38         if (target_page.decided) {
     39             return false;
     40         }
     41         target_page.bits = bits;
     42     }
     43     return true;
     44 }
     45 
     46 void finalize_target_page_bits_common(int min)
     47 {
     48     if (target_page.bits == 0) {
     49         target_page.bits = min;
     50     }
     51     target_page.mask = -1ull << target_page.bits;
     52     target_page.decided = true;
     53 }