| /* |
| * Copyright (c) 2018, Arm Limited. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include "../fvp_def.h" |
| |
| .globl platform_get_core_pos |
| |
| /*---------------------------------------------------------------------- |
| * unsigned int platform_get_core_pos(unsigned long mpid) |
| * |
| * Function to calculate the core position on FVP. |
| * |
| * (ClusterId * FVP_MAX_CPUS_PER_CLUSTER * FVP_MAX_PE_PER_CPU) + |
| * (CPUId * FVP_MAX_PE_PER_CPU) + |
| * ThreadId |
| * |
| * which can be simplified as: |
| * |
| * ((ClusterId * FVP_MAX_CPUS_PER_CLUSTER + CPUId) * FVP_MAX_PE_PER_CPU) |
| * + ThreadId |
| * --------------------------------------------------------------------- |
| */ |
| func platform_get_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 x3, #FVP_MAX_CPUS_PER_CLUSTER |
| madd x1, x2, x3, x1 |
| mov x3, #FVP_MAX_PE_PER_CPU |
| madd x0, x1, x3, x0 |
| ret |
| endfunc platform_get_core_pos |