70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
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/*
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* Variable page size handling
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#define IN_EXEC_VARY 1
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#include "exec/exec-all.h"
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#include <uc_priv.h>
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bool set_preferred_target_page_bits(struct uc_struct *uc, int bits)
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{
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/*
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* The target page size is the lowest common denominator for all
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* the CPUs in the system, so we can only make it smaller, never
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* larger. And we can't make it smaller once we've committed to
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* a particular size.
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*/
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#ifdef TARGET_PAGE_BITS_VARY
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assert(bits >= TARGET_PAGE_BITS_MIN);
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if (uc->init_target_page->bits == 0 || uc->init_target_page->bits > bits) {
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if (uc->init_target_page->decided) {
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return false;
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}
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uc->init_target_page->bits = bits;
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}
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#endif
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return true;
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}
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void finalize_target_page_bits(struct uc_struct *uc)
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{
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#ifdef TARGET_PAGE_BITS_VARY
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if (uc->init_target_page == NULL) {
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uc->init_target_page = g_new0(TargetPageBits, 1);
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} else {
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return;
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}
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if (uc->init_target_page->bits == 0) {
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uc->init_target_page->bits = TARGET_PAGE_BITS_MIN;
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}
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uc->init_target_page->mask = (target_long)-1 << uc->init_target_page->bits;
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uc->init_target_page->decided = true;
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/*
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* For the benefit of an -flto build, prevent the compiler from
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* hoisting a read from target_page before we finish initializing.
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*/
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barrier();
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#endif
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}
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