40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
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* Copyright (c) 2018, 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 "plat_ls.h"
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/*******************************************************************************
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* This function validates an MPIDR by checking whether it falls within the
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* acceptable bounds. An error code (-1) is returned if an incorrect mpidr
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* is passed.
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******************************************************************************/
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int ls_check_mpidr(u_register_t mpidr)
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{
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unsigned int cluster_id, cpu_id;
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uint64_t valid_mask;
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valid_mask = ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK);
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cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
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cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
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mpidr &= MPIDR_AFFINITY_MASK;
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if (mpidr & valid_mask)
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return -1;
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if (cluster_id >= PLAT_LS_CLUSTER_COUNT)
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return -1;
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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 >= plat_ls_get_cluster_core_count(mpidr))
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return -1;
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return 0;
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}
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