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
  59 struct 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
  69 struct microblaze_mmu_lookup
  70 {
  71     uint32_t paddr;
  72     uint32_t vaddr;
  73     unsigned int size;
  74     unsigned int idx;
  75     int prot;
  76     enum {
  77         ERR_PROT, ERR_MISS, ERR_HIT
  78     } err;
  79 };
  80
  81 void mmu_flip_um(CPUState *env, unsigned int um);
  82 unsigned int mmu_translate(struct microblaze_mmu *mmu,
  83                            struct microblaze_mmu_lookup *lu,
  84                            target_ulong vaddr, int rw, int mmu_idx);
  85 uint32_t mmu_read(CPUState *env, uint32_t rn);
  86 void mmu_write(CPUState *env, uint32_t rn, uint32_t v);
  87 void mmu_init(struct microblaze_mmu *mmu);