| Soby Mathew | b4c6df4 | 2022-11-09 11:13:29 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * SPDX-License-Identifier: BSD-3-Clause |
| 3 | * SPDX-FileCopyrightText: Copyright TF-RMM Contributors. |
| 4 | */ |
| 5 | |
| 6 | #include <arch.h> |
| 7 | #include <arch_helpers.h> |
| 8 | #include <assert.h> |
| 9 | #include <stdint.h> |
| 10 | #include <utils_def.h> |
| 11 | |
| 12 | /* |
| 13 | * Return the PA width supported by the current system. |
| 14 | */ |
| 15 | unsigned int arch_feat_get_pa_width(void) |
| 16 | { |
| 17 | /* |
| 18 | * Physical Address ranges supported in the AArch64 Memory Model. |
| 19 | * Value 0b110 is supported in ARMv8.2 onwards but not used in RMM. |
| 20 | */ |
| 21 | static const unsigned int pa_range_bits_arr[] = { |
| 22 | PARANGE_0000_WIDTH, PARANGE_0001_WIDTH, PARANGE_0010_WIDTH, |
| 23 | PARANGE_0011_WIDTH, PARANGE_0100_WIDTH, PARANGE_0101_WIDTH, |
| 24 | /* |
| 25 | * FEAT_LPA/LPA2 is not supported yet in RMM, |
| 26 | * so max PA width is 48. |
| 27 | */ |
| 28 | PARANGE_0101_WIDTH |
| 29 | }; |
| 30 | |
| 31 | register_t pa_range = (read_id_aa64mmfr0_el1() >> |
| 32 | ID_AA64MMFR0_EL1_PARANGE_SHIFT) & |
| 33 | ID_AA64MMFR0_EL1_PARANGE_MASK; |
| 34 | |
| 35 | assert(pa_range < ARRAY_SIZE(pa_range_bits_arr)); |
| 36 | |
| 37 | return pa_range_bits_arr[pa_range]; |
| 38 | } |