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_XIP, TT_TYPE_BLOCK | TT_MT_MEM | TT_AF | TT_RO | TT_NG
  19   .set      BLOCK_DEV, TT_TYPE_BLOCK | TT_MT_DEV | TT_AF | TT_XN | TT_NG
  20   .set      BLOCK_MEM, TT_TYPE_BLOCK | TT_MT_MEM | TT_AF | TT_XN | TT_NG
  21
  22   .globl    idmap
  23   .section  ".rodata.idmap", "a", %progbits
  24   .align    12
  25
  26 idmap:      /* level 0 */
  27   .quad     1f + TT_TYPE_TABLE
  28   .fill     511, 8, 0x0
  29
  30 1:          /* level 1 */
  31   .quad     20f + TT_TYPE_TABLE           // 1 GB of flash and device mappings
  32   .quad     21f + TT_TYPE_TABLE           // up to 1 GB of DRAM
  33   .fill     510, 8, 0x0                   // 510 GB of remaining VA space
  34
  35 20:         /* level 2 */
  36   .quad     3f + TT_TYPE_TABLE            // up to 2 MB of flash
  37   .quad     BLOCK_XIP | (0x1  << 21)      // another 2 MB of flash
  38   .fill     62, 8, 0x0                    // 124 MB of unused flash
  39   .set      idx, 64
  40   .rept     448
  41   .quad     BLOCK_DEV | (idx << 21)       // 896 MB of RW- device mappings
  42   .set      idx, idx + 1
  43   .endr
  44
  45 21:         /* level 2 */
  46   .set      idx, 0x40000000 >> 21
  47   .rept     64
  48   .quad     BLOCK_MEM | (idx << 21)       // 128 MB of RW- memory mappings
  49   .set      idx, idx + 1
  50   .endr
  51   .fill     448, 8, 0x0
  52
  53 3:          /* level 3 */
  54   .quad     0x0                           // omit first 4k page
  55   .set      idx, 1
  56   .rept     511
  57   .quad     PAGE_XIP | (idx << 12)        // 2044 KiB of R-X flash mappings
  58   .set      idx, idx + 1
  59   .endr