| Jiafei Pan | 46367ad | 2018-03-02 07:23:30 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include "plat_ls.h" |
| 8 | |
| 9 | /******************************************************************************* |
| 10 | * This function validates an MPIDR by checking whether it falls within the |
| 11 | * acceptable bounds. An error code (-1) is returned if an incorrect mpidr |
| 12 | * is passed. |
| 13 | ******************************************************************************/ |
| 14 | int ls_check_mpidr(u_register_t mpidr) |
| 15 | { |
| 16 | unsigned int cluster_id, cpu_id; |
| 17 | uint64_t valid_mask; |
| 18 | |
| 19 | valid_mask = ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK); |
| 20 | cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; |
| 21 | cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; |
| 22 | |
| 23 | mpidr &= MPIDR_AFFINITY_MASK; |
| 24 | if (mpidr & valid_mask) |
| 25 | return -1; |
| 26 | |
| 27 | if (cluster_id >= PLAT_LS_CLUSTER_COUNT) |
| 28 | return -1; |
| 29 | |
| 30 | /* |
| 31 | * Validate cpu_id by checking whether it represents a CPU in |
| 32 | * one of the two clusters present on the platform. |
| 33 | */ |
| 34 | if (cpu_id >= plat_ls_get_cluster_core_count(mpidr)) |
| 35 | return -1; |
| 36 | |
| 37 | |
| 38 | return 0; |
| 39 | } |