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d11bf649d5
The only place we really need to know the minimum is within page-vary-target.c. Rename the target/arm TARGET_PAGE_BITS_MIN to TARGET_PAGE_BITS_LEGACY to emphasize what it really means. Move the assertions related to minimum page size as well. Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* Variable page size handling -- target specific part.
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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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#define IN_PAGE_VARY 1
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#include "qemu/osdep.h"
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#include "exec/page-vary.h"
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#include "exec/target_page.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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#ifndef TARGET_PAGE_BITS_VARY
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QEMU_BUILD_BUG_ON(TARGET_PAGE_BITS < TARGET_PAGE_BITS_MIN);
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#endif
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#ifndef CONFIG_USER_ONLY
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#include "exec/tlb-flags.h"
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QEMU_BUILD_BUG_ON(TLB_FLAGS_MASK & ((1u < TARGET_PAGE_BITS_MIN) - 1));
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int migration_legacy_page_bits(void)
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{
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#ifdef TARGET_PAGE_BITS_VARY
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QEMU_BUILD_BUG_ON(TARGET_PAGE_BITS_LEGACY < TARGET_PAGE_BITS_MIN);
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return TARGET_PAGE_BITS_LEGACY;
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#else
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return TARGET_PAGE_BITS;
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#endif
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}
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#endif
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bool set_preferred_target_page_bits(int bits)
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{
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assert(bits >= TARGET_PAGE_BITS_MIN);
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#ifdef TARGET_PAGE_BITS_VARY
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return set_preferred_target_page_bits_common(bits);
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#else
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return true;
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#endif
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}
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void finalize_target_page_bits(void)
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{
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#ifndef TARGET_PAGE_BITS_VARY
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finalize_target_page_bits_common(TARGET_PAGE_BITS);
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#elif defined(CONFIG_USER_ONLY)
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assert(target_page.bits != 0);
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finalize_target_page_bits_common(target_page.bits);
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#else
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finalize_target_page_bits_common(TARGET_PAGE_BITS_LEGACY);
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#endif
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}
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