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/*
* Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include <platform_def.h>
#include <cpu_macros.S>
.globl plat_arm_calc_core_pos
.globl plat_reset_handler
/* ---------------------------------------------------------------------
* unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
*
* Function to calculate the core position on TC.
*
* (ClusterId * PLAT_MAX_CPUS_PER_CLUSTER * PLAT_MAX_PE_PER_CPU) +
* (CPUId * PLAT_MAX_PE_PER_CPU) +
* ThreadId
*
* which can be simplified as:
*
* ((ClusterId * PLAT_MAX_CPUS_PER_CLUSTER + CPUId) * PLAT_MAX_PE_PER_CPU)
* + ThreadId
* ---------------------------------------------------------------------
*/
func plat_arm_calc_core_pos
/*
* Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it
* look as if in a multi-threaded implementation.
*/
tst x0, #MPIDR_MT_MASK
lsl x3, x0, #MPIDR_AFFINITY_BITS
csel x3, x3, x0, eq
/* Extract individual affinity fields from MPIDR */
ubfx x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
ubfx x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
ubfx x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
/* Compute linear position */
mov x4, #PLAT_MAX_CPUS_PER_CLUSTER
madd x1, x2, x4, x1
mov x5, #PLAT_MAX_PE_PER_CPU
madd x0, x1, x5, x0
ret
endfunc plat_arm_calc_core_pos
/* -----------------------------------------------------
* void plat_reset_handler(void);
*
* Determine the CPU MIDR and disable power down bit for
* that CPU.
* -----------------------------------------------------
*/
func plat_reset_handler
ret
endfunc plat_reset_handler
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