1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <arch.h> 32 #include <plat_arm.h> 33 #include <platform_def.h> 34 35 /******************************************************************************* 36 * This function validates an MPIDR by checking whether it falls within the 37 * acceptable bounds. An error code (-1) is returned if an incorrect mpidr 38 * is passed. 39 ******************************************************************************/ 40 int arm_check_mpidr(u_register_t mpidr) 41 { 42 unsigned int cluster_id, cpu_id; 43 uint64_t valid_mask; 44 45 #if ARM_PLAT_MT 46 unsigned int pe_id; 47 48 valid_mask = ~(MPIDR_AFFLVL_MASK | 49 (MPIDR_AFFLVL_MASK << MPIDR_AFF1_SHIFT) | 50 (MPIDR_AFFLVL_MASK << MPIDR_AFF2_SHIFT)); 51 cluster_id = (mpidr >> MPIDR_AFF2_SHIFT) & MPIDR_AFFLVL_MASK; 52 cpu_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 53 pe_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 54 #else 55 valid_mask = ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK); 56 cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 57 cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 58 #endif /* ARM_PLAT_MT */ 59 60 mpidr &= MPIDR_AFFINITY_MASK; 61 if (mpidr & valid_mask) 62 return -1; 63 64 if (cluster_id >= PLAT_ARM_CLUSTER_COUNT) 65 return -1; 66 67 /* Validate cpu_id by checking whether it represents a CPU in 68 one of the two clusters present on the platform. */ 69 if (cpu_id >= plat_arm_get_cluster_core_count(mpidr)) 70 return -1; 71 72 #if ARM_PLAT_MT 73 if (pe_id >= plat_arm_get_cpu_pe_count(mpidr)) 74 return -1; 75 #endif /* ARM_PLAT_MT */ 76 77 return 0; 78 } 79