1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <platform_def.h> 8 9 #include <arch.h> 10 #include <plat/arm/common/plat_arm.h> 11 12 /******************************************************************************* 13 * This function validates an MPIDR by checking whether it falls within the 14 * acceptable bounds. An error code (-1) is returned if an incorrect mpidr 15 * is passed. 16 ******************************************************************************/ 17 int arm_check_mpidr(u_register_t mpidr) 18 { 19 unsigned int cluster_id, cpu_id; 20 uint64_t valid_mask; 21 22 #if ARM_PLAT_MT 23 unsigned int pe_id; 24 25 valid_mask = ~(MPIDR_AFFLVL_MASK | 26 (MPIDR_AFFLVL_MASK << MPIDR_AFF1_SHIFT) | 27 (MPIDR_AFFLVL_MASK << MPIDR_AFF2_SHIFT)); 28 cluster_id = (mpidr >> MPIDR_AFF2_SHIFT) & MPIDR_AFFLVL_MASK; 29 cpu_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 30 pe_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 31 #else 32 valid_mask = ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK); 33 cluster_id = (unsigned int) ((mpidr >> MPIDR_AFF1_SHIFT) & 34 MPIDR_AFFLVL_MASK); 35 cpu_id = (unsigned int) ((mpidr >> MPIDR_AFF0_SHIFT) & 36 MPIDR_AFFLVL_MASK); 37 #endif /* ARM_PLAT_MT */ 38 39 mpidr &= MPIDR_AFFINITY_MASK; 40 if ((mpidr & valid_mask) != 0U) 41 return -1; 42 43 if (cluster_id >= PLAT_ARM_CLUSTER_COUNT) 44 return -1; 45 46 /* Validate cpu_id by checking whether it represents a CPU in 47 one of the two clusters present on the platform. */ 48 if (cpu_id >= plat_arm_get_cluster_core_count(mpidr)) 49 return -1; 50 51 #if ARM_PLAT_MT 52 if (pe_id >= plat_arm_get_cpu_pe_count(mpidr)) 53 return -1; 54 #endif /* ARM_PLAT_MT */ 55 56 return 0; 57 } 58