include/exec/tlb-common.h

   1 /*
   2  * Common definitions for the softmmu tlb
   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 #ifndef EXEC_TLB_COMMON_H
  20 #define EXEC_TLB_COMMON_H 1
  21
  22 #define CPU_TLB_ENTRY_BITS 5
  23
  24 /* Minimalized TLB entry for use by TCG fast path. */
  25 typedef union CPUTLBEntry {
  26     struct {
  27         uint64_t addr_read;
  28         uint64_t addr_write;
  29         uint64_t addr_code;
  30         /*
  31          * Addend to virtual address to get host address.  IO accesses
  32          * use the corresponding iotlb value.
  33          */
  34         uintptr_t addend;
  35     };
  36     /*
  37      * Padding to get a power of two size, as well as index
  38      * access to addr_{read,write,code}.
  39      */
  40     uint64_t addr_idx[(1 << CPU_TLB_ENTRY_BITS) / sizeof(uint64_t)];
  41 } CPUTLBEntry;
  42
  43 QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS));
  44
  45 /*
  46  * Data elements that are per MMU mode, accessed by the fast path.
  47  * The structure is aligned to aid loading the pair with one insn.
  48  */
  49 typedef struct CPUTLBDescFast {
  50     /* Contains (n_entries - 1) << CPU_TLB_ENTRY_BITS */
  51     uintptr_t mask;
  52     /* The array of tlb entries itself. */
  53     CPUTLBEntry *table;
  54 } CPUTLBDescFast QEMU_ALIGNED(2 * sizeof(void *));
  55
  56 #endif /* EXEC_TLB_COMMON_H */