| /* |
| * Copyright 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // |
| // Initial TTBR0 idmap activated before first memory write. |
| // Remains active until a new page table is created by early Rust. |
| // |
| |
| .set .SZ_1K, 1024 |
| .set .SZ_4K, 4 * .SZ_1K |
| .set .SZ_1M, 1024 * .SZ_1K |
| .set .SZ_2M, 2 * .SZ_1M |
| .set .SZ_1G, 1024 * .SZ_1M |
| |
| .set .PAGE_SIZE, .SZ_4K |
| |
| .set .ORIGIN_ADDR, 2 * .SZ_1G |
| .set .TEXT_ADDR, .ORIGIN_ADDR + (0 * .SZ_2M) |
| .set .DATA_ADDR, .ORIGIN_ADDR + (1 * .SZ_2M) |
| |
| .set .L_TT_TYPE_BLOCK, 0x1 |
| .set .L_TT_TYPE_PAGE, 0x3 |
| .set .L_TT_TYPE_TABLE, 0x3 |
| |
| .set .L_TT_AF, 0x1 << 10 // Access flag |
| .set .L_TT_NG, 0x1 << 11 // Not global |
| .set .L_TT_RO, 0x2 << 6 |
| .set .L_TT_XN, 0x3 << 53 |
| |
| .set .L_TT_MT_DEV, 0x0 << 2 // MAIR #0 (DEV_nGnRE) |
| .set .L_TT_MT_MEM, (0x1 << 2) | (0x3 << 8) // MAIR #1 (MEM_WBWA), inner shareable |
| |
| .set .L_BLOCK_RO, .L_TT_TYPE_BLOCK | .L_TT_MT_MEM | .L_TT_AF | .L_TT_RO | .L_TT_XN |
| .set .L_BLOCK_DEV, .L_TT_TYPE_BLOCK | .L_TT_MT_DEV | .L_TT_AF | .L_TT_XN |
| .set .L_BLOCK_MEM, .L_TT_TYPE_BLOCK | .L_TT_MT_MEM | .L_TT_AF | .L_TT_XN | .L_TT_NG |
| .set .L_BLOCK_MEM_XIP, .L_TT_TYPE_BLOCK | .L_TT_MT_MEM | .L_TT_AF | .L_TT_NG | .L_TT_RO |
| |
| .section ".rodata.idmap", "a", %progbits |
| .global idmap |
| .balign .PAGE_SIZE |
| idmap: |
| /* level 1 */ |
| .quad .L_BLOCK_DEV | 0x0 // 1 GiB of device mappings |
| .quad 0x0 // 1 GiB unmapped |
| .quad .L_TT_TYPE_TABLE + 0f // up to 1 GiB of DRAM |
| .balign .PAGE_SIZE, 0 // unmapped |
| |
| /* level 2 */ |
| 0: |
| .quad .L_BLOCK_MEM_XIP | .TEXT_ADDR // 2 MiB of DRAM containing image |
| .quad .L_BLOCK_MEM | .DATA_ADDR // 2 MiB of writable DRAM |
| .balign .PAGE_SIZE, 0 // unmapped |