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/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <plat_arm.h>
#include <platform_def.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));
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 = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
#endif /* ARM_PLAT_MT */
mpidr &= MPIDR_AFFINITY_MASK;
if (mpidr & valid_mask)
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;
}
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