mirror of https://gitee.com/openkylin/qemu.git
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* internal execution defines for qemu
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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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#ifndef EXEC_TB_HASH_H
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#define EXEC_TB_HASH_H
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#include "qemu/xxhash.h"
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#ifdef CONFIG_SOFTMMU
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/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
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addresses on the same page. The top bits are the same. This allows
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TLB invalidation to quickly clear a subset of the hash table. */
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#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
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#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
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#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
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#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
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static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
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{
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target_ulong tmp;
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tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
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return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
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}
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static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
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{
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target_ulong tmp;
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tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
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return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
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| (tmp & TB_JMP_ADDR_MASK));
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}
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#else
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/* In user-mode we can get better hashing because we do not have a TLB */
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static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
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{
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return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1);
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}
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#endif /* CONFIG_SOFTMMU */
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static inline
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uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags,
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uint32_t cf_mask, uint32_t trace_vcpu_dstate)
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{
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return qemu_xxhash7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate);
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}
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#endif
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