49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <platform_def.h>
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#include <arch.h>
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#include <lib/psci/psci.h>
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#include <plat/common/platform.h>
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#pragma weak plat_core_pos_by_mpidr
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/*******************************************************************************
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* This function implements a part of the critical interface between the psci
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* generic layer and the platform that allows the former to query the platform
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* to convert an MPIDR to a unique linear index. An error code (-1) is returned
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* in case the MPIDR is invalid.
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******************************************************************************/
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int32_t plat_core_pos_by_mpidr(u_register_t mpidr)
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{
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u_register_t cluster_id, cpu_id;
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int32_t result;
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cluster_id = (mpidr >> (u_register_t)MPIDR_AFF1_SHIFT) &
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(u_register_t)MPIDR_AFFLVL_MASK;
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cpu_id = (mpidr >> (u_register_t)MPIDR_AFF0_SHIFT) &
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(u_register_t)MPIDR_AFFLVL_MASK;
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/* CorePos = CoreId + (ClusterId * cpus per cluster) */
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result = (int32_t)cpu_id + ((int32_t)cluster_id *
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PLATFORM_MAX_CPUS_PER_CLUSTER);
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if (cluster_id >= (u_register_t)PLATFORM_CLUSTER_COUNT) {
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result = PSCI_E_NOT_PRESENT;
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}
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/*
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* Validate cpu_id by checking whether it represents a CPU in
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* one of the two clusters present on the platform.
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*/
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if (cpu_id >= (u_register_t)PLATFORM_MAX_CPUS_PER_CLUSTER) {
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result = PSCI_E_NOT_PRESENT;
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}
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return result;
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}
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