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
  33 static 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
  40 static 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
  48 static inline
  49 uint32_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