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// SPDX-License-Identifier: BSD-2-Clause-Patent
// Copyright 2022 Google LLC
// Author: Ard Biesheuvel <ardb@google.com>
.set TT_TYPE_BLOCK, 0x1
.set TT_TYPE_PAGE, 0x3
.set TT_TYPE_TABLE, 0x3
.set TT_AF, 0x1 << 10
.set TT_NG, 0x1 << 11
.set TT_RO, 0x2 << 6
.set TT_XN, 0x3 << 53
.set TT_MT_DEV, 0x0 << 2 // MAIR #0
.set TT_MT_MEM, (0x3 << 2) | (0x3 << 8) // MAIR #3
.set PAGE_XIP, TT_TYPE_PAGE | TT_MT_MEM | TT_AF | TT_RO | TT_NG
.set BLOCK_XIP, TT_TYPE_BLOCK | TT_MT_MEM | TT_AF | TT_RO | TT_NG
.set BLOCK_DEV, TT_TYPE_BLOCK | TT_MT_DEV | TT_AF | TT_XN | TT_NG
.set BLOCK_MEM, TT_TYPE_BLOCK | TT_MT_MEM | TT_AF | TT_XN | TT_NG
.globl idmap
.section ".rodata.idmap", "a", %progbits
.align 12
idmap: /* level 0 */
.quad 1f + TT_TYPE_TABLE
.fill 511, 8, 0x0
1: /* level 1 */
.quad 20f + TT_TYPE_TABLE // 1 GB of flash and device mappings
.quad 21f + TT_TYPE_TABLE // up to 1 GB of DRAM
.fill 510, 8, 0x0 // 510 GB of remaining VA space
20: /* level 2 */
.quad 3f + TT_TYPE_TABLE // up to 2 MB of flash
.quad BLOCK_XIP | (0x1 << 21) // another 2 MB of flash
.fill 62, 8, 0x0 // 124 MB of unused flash
.set idx, 64
.rept 448
.quad BLOCK_DEV | (idx << 21) // 896 MB of RW- device mappings
.set idx, idx + 1
.endr
21: /* level 2 */
.set idx, 0x40000000 >> 21
.rept 64
.quad BLOCK_MEM | (idx << 21) // 128 MB of RW- memory mappings
.set idx, idx + 1
.endr
.fill 448, 8, 0x0
3: /* level 3 */
.quad 0x0 // omit first 4k page
.set idx, 1
.rept 511
.quad PAGE_XIP | (idx << 12) // 2044 KiB of R-X flash mappings
.set idx, idx + 1
.endr
AARCH64_BTI_NOTE()
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