LXR qemu/include/exec/tb-hash.h

   1/*
   2 * internal execution defines for qemu
   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 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#ifndef EXEC_TB_HASH_H
  21#define EXEC_TB_HASH_H
  22
  23#include "exec/tb-hash-xx.h"
  24
  25/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
  26   addresses on the same page.  The top bits are the same.  This allows
  27   TLB invalidation to quickly clear a subset of the hash table.  */
  28#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
  29#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
  30#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
  31#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
  32
  33static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
  34{
  35    target_ulong tmp;
  36    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  37    return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
  38}
  39
  40static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
  41{
  42    target_ulong tmp;
  43    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  44    return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
  45           | (tmp & TB_JMP_ADDR_MASK));
  46}
  47
  48static inline
  49uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags)
  50{
  51    return tb_hash_func5(phys_pc, pc, flags);
  52}
  53
  54#endif
  55