Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 1 | /* |
Daniel Boulby | fef5d2d | 2018-05-04 14:04:07 +0100 | [diff] [blame] | 2 | * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 7 | #ifndef XLAT_TABLES_AARCH64_H |
| 8 | #define XLAT_TABLES_AARCH64_H |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 9 | |
| 10 | #include <arch.h> |
| 11 | #include <utils_def.h> |
| 12 | #include <xlat_tables_defs.h> |
| 13 | |
| 14 | #if !defined(PAGE_SIZE) |
| 15 | #error "PAGE_SIZE is not defined." |
| 16 | #endif |
| 17 | |
| 18 | /* |
Antonio Nino Diaz | bafc753 | 2017-10-25 11:53:25 +0100 | [diff] [blame] | 19 | * Encode a Physical Address Space size for its use in TCR_ELx. |
| 20 | */ |
| 21 | unsigned long long tcr_physical_addr_size_bits(unsigned long long max_addr); |
| 22 | |
| 23 | /* |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 24 | * In AArch64 state, the MMU may support 4 KB, 16 KB and 64 KB page |
| 25 | * granularity. For 4KB granularity, a level 0 table descriptor doesn't support |
| 26 | * block translation. For 16KB, the same thing happens to levels 0 and 1. For |
| 27 | * 64KB, same for level 1. See section D4.3.1 of the ARMv8-A Architecture |
| 28 | * Reference Manual (DDI 0487A.k) for more information. |
| 29 | * |
| 30 | * The define below specifies the first table level that allows block |
| 31 | * descriptors. |
| 32 | */ |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 33 | #if PAGE_SIZE == PAGE_SIZE_4KB |
Sandrine Bailleux | 12e8644 | 2017-07-19 10:11:13 +0100 | [diff] [blame] | 34 | # define MIN_LVL_BLOCK_DESC U(1) |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 35 | #elif (PAGE_SIZE == PAGE_SIZE_16KB) || (PAGE_SIZE == PAGE_SIZE_64KB) |
Sandrine Bailleux | 12e8644 | 2017-07-19 10:11:13 +0100 | [diff] [blame] | 36 | # define MIN_LVL_BLOCK_DESC U(2) |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 37 | #endif |
| 38 | |
| 39 | #define XLAT_TABLE_LEVEL_MIN U(0) |
| 40 | |
| 41 | /* |
| 42 | * Define the architectural limits of the virtual address space in AArch64 |
| 43 | * state. |
| 44 | * |
| 45 | * TCR.TxSZ is calculated as 64 minus the width of said address space. |
| 46 | * The value of TCR.TxSZ must be in the range 16 to 39 [1], which means that |
| 47 | * the virtual address space width must be in the range 48 to 25 bits. |
| 48 | * |
| 49 | * [1] See the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more |
| 50 | * information: |
| 51 | * Page 1730: 'Input address size', 'For all translation stages'. |
| 52 | */ |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 53 | #define MIN_VIRT_ADDR_SPACE_SIZE (ULL(1) << (U(64) - TCR_TxSZ_MAX)) |
| 54 | #define MAX_VIRT_ADDR_SPACE_SIZE (ULL(1) << (U(64) - TCR_TxSZ_MIN)) |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 55 | |
| 56 | /* |
| 57 | * Here we calculate the initial lookup level from the value of the given |
| 58 | * virtual address space size. For a 4 KB page size, |
| 59 | * - level 0 supports virtual address spaces of widths 48 to 40 bits; |
| 60 | * - level 1 from 39 to 31; |
| 61 | * - level 2 from 30 to 25. |
| 62 | * |
| 63 | * Wider or narrower address spaces are not supported. As a result, level 3 |
| 64 | * cannot be used as initial lookup level with 4 KB granularity. See section |
| 65 | * D4.2.5 in the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more |
| 66 | * information. |
| 67 | * |
| 68 | * For example, for a 35-bit address space (i.e. virt_addr_space_size == |
| 69 | * 1 << 35), TCR.TxSZ will be programmed to (64 - 35) = 29. According to Table |
| 70 | * D4-11 in the ARM ARM, the initial lookup level for an address space like that |
| 71 | * is 1. |
| 72 | * |
| 73 | * Note that this macro assumes that the given virtual address space size is |
| 74 | * valid. Therefore, the caller is expected to check it is the case using the |
| 75 | * CHECK_VIRT_ADDR_SPACE_SIZE() macro first. |
| 76 | */ |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 77 | #define GET_XLAT_TABLE_LEVEL_BASE(_virt_addr_space_sz) \ |
| 78 | (((_virt_addr_space_sz) > (ULL(1) << L0_XLAT_ADDRESS_SHIFT)) \ |
| 79 | ? 0U \ |
| 80 | : (((_virt_addr_space_sz) > (ULL(1) << L1_XLAT_ADDRESS_SHIFT)) \ |
| 81 | ? 1U : 2U)) |
Sandrine Bailleux | 090c849 | 2017-05-19 09:59:37 +0100 | [diff] [blame] | 82 | |
Antonio Nino Diaz | 50eb374 | 2018-07-24 10:20:53 +0100 | [diff] [blame] | 83 | #endif /* XLAT_TABLES_AARCH64_H */ |