arm-trusted-firmware/plat/arm/board/morello/aarch64/morello_helper.S

/*
 * Copyright (c) 2020, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <cpu_macros.S>
#include <rainier.h>

#include <platform_def.h>

	.globl	plat_arm_calc_core_pos
	.globl	plat_reset_handler

	/* -----------------------------------------------------
	 * unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
	 *
	 * Helper function to calculate the core position.
	 * ((ChipId * MORELLO_MAX_CLUSTERS_PER_CHIP + ClusterId) *
	 * MORELLO_MAX_CPUS_PER_CLUSTER * MORELLO_MAX_PE_PER_CPU) +
	 * (CPUId * MORELLO_MAX_PE_PER_CPU) + ThreadId
	 *
	 * which can be simplified as:
	 *
	 * (((ChipId * MORELLO_MAX_CLUSTERS_PER_CHIP + ClusterId) *
	 * MORELLO_MAX_CPUS_PER_CLUSTER + CPUId) * MORELLO_MAX_PE_PER_CPU) +
	 * ThreadId
	 * ------------------------------------------------------
	 */

func plat_arm_calc_core_pos
	mov	x4, x0

	/*
	 * The MT bit in MPIDR is always set for morello and the
	 * affinity level 0 corresponds to thread affinity level.
	 */

	/* Extract individual affinity fields from MPIDR */
	ubfx	x0, x4, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
	ubfx	x1, x4, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
	ubfx	x2, x4, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
	ubfx	x3, x4, #MPIDR_AFF3_SHIFT, #MPIDR_AFFINITY_BITS

	/* Compute linear position */
	mov	x4, #MORELLO_MAX_CLUSTERS_PER_CHIP
	madd	x2, x3, x4, x2
	mov	x4, #MORELLO_MAX_CPUS_PER_CLUSTER
	madd	x1, x2, x4, x1
	mov	x4, #MORELLO_MAX_PE_PER_CPU
	madd	x0, x1, x4, x0
	ret
endfunc plat_arm_calc_core_pos