ArmVirtPkg/Library/ArmPlatformLibQemu/IdMap.S

   1 // SPDX-License-Identifier: BSD-2-Clause-Patent
   2 // Copyright 2022 Google LLC
   3 // Author: Ard Biesheuvel <ardb@google.com>
   4
   5   .set      TT_TYPE_BLOCK, 0x1
   6   .set      TT_TYPE_PAGE,  0x3
   7   .set      TT_TYPE_TABLE, 0x3
   8
   9   .set      TT_AF, 0x1 << 10
  10   .set      TT_NG, 0x1 << 11
  11   .set      TT_RO, 0x2 << 6
  12   .set      TT_XN, 0x3 << 53
  13
  14   .set      TT_MT_DEV, 0x0 << 2                 // MAIR #0
  15   .set      TT_MT_MEM, (0x3 << 2) | (0x3 << 8)  // MAIR #3
  16
  17   .set      PAGE_XIP,  TT_TYPE_PAGE  | TT_MT_MEM | TT_AF | TT_RO | TT_NG
  18   .set      BLOCK_DEV, TT_TYPE_BLOCK | TT_MT_DEV | TT_AF | TT_XN | TT_NG
  19   .set      BLOCK_MEM, TT_TYPE_BLOCK | TT_MT_MEM | TT_AF | TT_XN | TT_NG
  20
  21   .globl    idmap
  22   .section  ".rodata.idmap", "a", %progbits
  23   .align    12
  24
  25 idmap:      /* level 0 */
  26   .quad     1f + TT_TYPE_TABLE
  27   .fill     511, 8, 0x0
  28
  29 1:          /* level 1 */
  30   .quad     20f + TT_TYPE_TABLE           // 1 GB of flash and device mappings
  31   .quad     21f + TT_TYPE_TABLE           // up to 1 GB of DRAM
  32   .fill     510, 8, 0x0                   // 510 GB of remaining VA space
  33
  34 20:         /* level 2 */
  35   .quad     3f + TT_TYPE_TABLE            // up to 2 MB of flash
  36   .fill     63, 8, 0x0                    // 126 MB of unused flash
  37   .set      idx, 64
  38   .rept     448
  39   .quad     BLOCK_DEV | (idx << 21)       // 896 MB of RW- device mappings
  40   .set      idx, idx + 1
  41   .endr
  42
  43 21:         /* level 2 */
  44   .set      idx, 0x40000000 >> 21
  45   .rept     64
  46   .quad     BLOCK_MEM | (idx << 21)       // 128 MB of RW- memory mappings
  47   .set      idx, idx + 1
  48   .endr
  49   .fill     448, 8, 0x0
  50
  51 3:          /* level 3 */
  52   .quad     0x0                           // omit first 4k page
  53   .set      idx, 1
  54   .rept     511
  55   .quad     PAGE_XIP | (idx << 12)        // 2044 KiB of R-X flash mappings
  56   .set      idx, idx + 1
  57   .endr