LXR qemu/accel/tcg/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 2.1 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/cpu-defs.h"
  24#include "exec/exec-all.h"
  25#include "qemu/xxhash.h"
  26
  27#ifdef CONFIG_SOFTMMU
  28
  29/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
  30   addresses on the same page.  The top bits are the same.  This allows
  31   TLB invalidation to quickly clear a subset of the hash table.  */
  32#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
  33#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
  34#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
  35#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
  36
  37static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
  38{
  39    target_ulong tmp;
  40    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  41    return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
  42}
  43
  44static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
  45{
  46    target_ulong tmp;
  47    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  48    return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
  49           | (tmp & TB_JMP_ADDR_MASK));
  50}
  51
  52#else
  53
  54/* In user-mode we can get better hashing because we do not have a TLB */
  55static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
  56{
  57    return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1);
  58}
  59
  60#endif /* CONFIG_SOFTMMU */
  61
  62static inline
  63uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags,
  64                      uint32_t cf_mask, uint32_t trace_vcpu_dstate)
  65{
  66    return qemu_xxhash7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate);
  67}
  68
  69#endif
  70