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-rw-r--r--plat/arm/common/arm_topology.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/plat/arm/common/arm_topology.c b/plat/arm/common/arm_topology.c
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+++ b/plat/arm/common/arm_topology.c
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+/*
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <plat/arm/common/plat_arm.h>
+
+/*******************************************************************************
+ * This function validates an MPIDR by checking whether it falls within the
+ * acceptable bounds. An error code (-1) is returned if an incorrect mpidr
+ * is passed.
+ ******************************************************************************/
+int arm_check_mpidr(u_register_t mpidr)
+{
+ unsigned int cluster_id, cpu_id;
+ uint64_t valid_mask;
+
+#if ARM_PLAT_MT
+ unsigned int pe_id;
+
+ valid_mask = ~(MPIDR_AFFLVL_MASK |
+ (MPIDR_AFFLVL_MASK << MPIDR_AFF1_SHIFT) |
+ (MPIDR_AFFLVL_MASK << MPIDR_AFF2_SHIFT) |
+ (MPIDR_AFFLVL_MASK << MPIDR_AFF3_SHIFT));
+ cluster_id = (mpidr >> MPIDR_AFF2_SHIFT) & MPIDR_AFFLVL_MASK;
+ cpu_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
+ pe_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
+#else
+ valid_mask = ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK);
+ cluster_id = (unsigned int) ((mpidr >> MPIDR_AFF1_SHIFT) &
+ MPIDR_AFFLVL_MASK);
+ cpu_id = (unsigned int) ((mpidr >> MPIDR_AFF0_SHIFT) &
+ MPIDR_AFFLVL_MASK);
+#endif /* ARM_PLAT_MT */
+
+ mpidr &= MPIDR_AFFINITY_MASK;
+ if ((mpidr & valid_mask) != 0U)
+ return -1;
+
+ if (cluster_id >= PLAT_ARM_CLUSTER_COUNT)
+ return -1;
+
+ /* Validate cpu_id by checking whether it represents a CPU in
+ one of the two clusters present on the platform. */
+ if (cpu_id >= plat_arm_get_cluster_core_count(mpidr))
+ return -1;
+
+#if ARM_PLAT_MT
+ if (pe_id >= plat_arm_get_cpu_pe_count(mpidr))
+ return -1;
+#endif /* ARM_PLAT_MT */
+
+ return 0;
+}