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70 lines
2.4 KiB
70 lines
2.4 KiB
/*
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* Definitions for cpus with variable page sizes.
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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 2.1 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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#ifndef EXEC_PAGE_VARY_H
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#define EXEC_PAGE_VARY_H
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/*
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* For system mode, the minimum comes from the number of bits
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* required for maximum alignment (6) and the number of bits
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* required for TLB_FLAGS_MASK (3).
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*
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* For user mode, TARGET_PAGE_BITS_VARY is a hack to allow the target
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* page size to match the host page size. Mostly, this reduces the
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* ordinary target page size to run on a host with 4KiB pages (i.e. x86).
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* There is no true minimum required by the implementation, but keep the
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* same minimum as for system mode for sanity.
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* See linux-user/mmap.c, mmap_h_lt_g and mmap_h_gt_g.
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*/
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#define TARGET_PAGE_BITS_MIN 9
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typedef struct {
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bool decided;
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int bits;
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uint64_t mask;
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} TargetPageBits;
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/**
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* set_preferred_target_page_bits:
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* @bits: number of bits needed to represent an address within the page
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*
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* Set the preferred target page size (the actual target page
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* size may be smaller than any given CPU's preference).
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* Returns true on success, false on failure (which can only happen
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* if this is called after the system has already finalized its
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* choice of page size and the requested page size is smaller than that).
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*/
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bool set_preferred_target_page_bits(int bits);
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/**
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* finalize_target_page_bits:
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* Commit the final value set by set_preferred_target_page_bits.
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*/
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void finalize_target_page_bits(void);
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/**
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* migration_legacy_page_bits
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*
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* For migration compatibility with qemu v2.9, prior to the introduction
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* of the configuration/target-page-bits section, return the value of
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* TARGET_PAGE_BITS that the target had then.
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*/
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int migration_legacy_page_bits(void);
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#endif /* EXEC_PAGE_VARY_H */
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