accel/tcg/tb-jmp-cache.h

   1 /*
   2  * The per-CPU TranslationBlock jump cache.
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #ifndef ACCEL_TCG_TB_JMP_CACHE_H
  10 #define ACCEL_TCG_TB_JMP_CACHE_H
  11
  12 #include "qemu/rcu.h"
  13 #include "exec/cpu-common.h"
  14
  15 #define TB_JMP_CACHE_BITS 12
  16 #define TB_JMP_CACHE_SIZE (1 << TB_JMP_CACHE_BITS)
  17
  18 /*
  19  * Invalidated in parallel; all accesses to 'tb' must be atomic.
  20  * A valid entry is read/written by a single CPU, therefore there is
  21  * no need for qatomic_rcu_read() and pc is always consistent with a
  22  * non-NULL value of 'tb'.  Strictly speaking pc is only needed for
  23  * CF_PCREL, but it's used always for simplicity.
  24  */
  25 typedef struct CPUJumpCache {
  26     struct rcu_head rcu;
  27     struct {
  28         TranslationBlock *tb;
  29         vaddr pc;
  30     } array[TB_JMP_CACHE_SIZE];
  31 } CPUJumpCache;
  32
  33 #endif /* ACCEL_TCG_TB_JMP_CACHE_H */