62 lines
1.7 KiB
ArmAsm
62 lines
1.7 KiB
ArmAsm
/*
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* Copyright (c) 2020, 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 <arch.h>
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#include <asm_macros.S>
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#include <platform_def.h>
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#include <cpu_macros.S>
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.globl plat_arm_calc_core_pos
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.globl plat_reset_handler
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/* ---------------------------------------------------------------------
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* unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
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*
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* Function to calculate the core position on TC0.
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*
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* (ClusterId * PLAT_MAX_CPUS_PER_CLUSTER * PLAT_MAX_PE_PER_CPU) +
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* (CPUId * PLAT_MAX_PE_PER_CPU) +
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* ThreadId
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*
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* which can be simplified as:
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*
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* ((ClusterId * PLAT_MAX_CPUS_PER_CLUSTER + CPUId) * PLAT_MAX_PE_PER_CPU)
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* + ThreadId
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* ---------------------------------------------------------------------
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*/
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func plat_arm_calc_core_pos
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/*
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* Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it
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* look as if in a multi-threaded implementation.
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*/
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tst x0, #MPIDR_MT_MASK
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lsl x3, x0, #MPIDR_AFFINITY_BITS
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csel x3, x3, x0, eq
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/* Extract individual affinity fields from MPIDR */
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ubfx x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
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ubfx x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
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ubfx x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
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/* Compute linear position */
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mov x4, #PLAT_MAX_CPUS_PER_CLUSTER
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madd x1, x2, x4, x1
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mov x5, #PLAT_MAX_PE_PER_CPU
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madd x0, x1, x5, x0
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ret
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endfunc plat_arm_calc_core_pos
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/* -----------------------------------------------------
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* void plat_reset_handler(void);
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*
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* Determine the CPU MIDR and disable power down bit for
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* that CPU.
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* -----------------------------------------------------
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*/
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func plat_reset_handler
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ret
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endfunc plat_reset_handler
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