LXR qemu/target-microblaze/mmu.h

   1/*
   2 *  Microblaze MMU emulation for qemu.
   3 *
   4 *  Copyright (c) 2009 Edgar E. Iglesias
   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#define MMU_R_PID    0
  21#define MMU_R_ZPR    1
  22#define MMU_R_TLBX   2
  23#define MMU_R_TLBLO  3
  24#define MMU_R_TLBHI  4
  25#define MMU_R_TLBSX  5
  26
  27#define RAM_DATA     1
  28#define RAM_TAG      0
  29
  30/* Tag portion */
  31#define TLB_EPN_MASK          0xFFFFFC00 /* Effective Page Number */
  32#define TLB_PAGESZ_MASK       0x00000380
  33#define TLB_PAGESZ(x)         (((x) & 0x7) << 7)
  34#define PAGESZ_1K             0
  35#define PAGESZ_4K             1
  36#define PAGESZ_16K            2
  37#define PAGESZ_64K            3
  38#define PAGESZ_256K           4
  39#define PAGESZ_1M             5
  40#define PAGESZ_4M             6
  41#define PAGESZ_16M            7
  42#define TLB_VALID             0x00000040 /* Entry is valid */
  43
  44/* Data portion */
  45#define TLB_RPN_MASK          0xFFFFFC00 /* Real Page Number */
  46#define TLB_PERM_MASK         0x00000300
  47#define TLB_EX                0x00000200 /* Instruction execution allowed */
  48#define TLB_WR                0x00000100 /* Writes permitted */
  49#define TLB_ZSEL_MASK         0x000000F0
  50#define TLB_ZSEL(x)           (((x) & 0xF) << 4)
  51#define TLB_ATTR_MASK         0x0000000F
  52#define TLB_W                 0x00000008 /* Caching is write-through */
  53#define TLB_I                 0x00000004 /* Caching is inhibited */
  54#define TLB_M                 0x00000002 /* Memory is coherent */
  55#define TLB_G                 0x00000001 /* Memory is guarded from prefetch */
  56
  57#define TLB_ENTRIES    64
  58
  59struct microblaze_mmu
  60{
  61    /* Data and tag brams.  */
  62    uint32_t rams[2][TLB_ENTRIES];
  63    /* We keep a separate ram for the tids to avoid the 48 bit tag width.  */
  64    uint8_t tids[TLB_ENTRIES];
  65    /* Control flops.  */
  66    uint32_t regs[8];
  67
  68    int c_mmu;
  69    int c_mmu_tlb_access;
  70    int c_mmu_zones;
  71};
  72
  73struct microblaze_mmu_lookup
  74{
  75    uint32_t paddr;
  76    uint32_t vaddr;
  77    unsigned int size;
  78    unsigned int idx;
  79    int prot;
  80    enum {
  81        ERR_PROT, ERR_MISS, ERR_HIT
  82    } err;
  83};
  84
  85unsigned int mmu_translate(struct microblaze_mmu *mmu,
  86                           struct microblaze_mmu_lookup *lu,
  87                           target_ulong vaddr, int rw, int mmu_idx);
  88uint32_t mmu_read(CPUMBState *env, uint32_t rn);
  89void mmu_write(CPUMBState *env, uint32_t rn, uint32_t v);
  90void mmu_init(struct microblaze_mmu *mmu);
  91