| Chandni Cherukuri | f3a6cab | 2020-09-22 18:56:25 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2020, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include <cpu_macros.S> |
| 10 | #include <rainier.h> |
| 11 | |
| 12 | #include <platform_def.h> |
| 13 | |
| 14 | .globl plat_arm_calc_core_pos |
| 15 | .globl plat_reset_handler |
| 16 | |
| 17 | /* ----------------------------------------------------- |
| 18 | * unsigned int plat_arm_calc_core_pos(u_register_t mpidr) |
| 19 | * |
| 20 | * Helper function to calculate the core position. |
| 21 | * ((ChipId * MORELLO_MAX_CLUSTERS_PER_CHIP + ClusterId) * |
| 22 | * MORELLO_MAX_CPUS_PER_CLUSTER * MORELLO_MAX_PE_PER_CPU) + |
| 23 | * (CPUId * MORELLO_MAX_PE_PER_CPU) + ThreadId |
| 24 | * |
| 25 | * which can be simplified as: |
| 26 | * |
| 27 | * (((ChipId * MORELLO_MAX_CLUSTERS_PER_CHIP + ClusterId) * |
| 28 | * MORELLO_MAX_CPUS_PER_CLUSTER + CPUId) * MORELLO_MAX_PE_PER_CPU) + |
| 29 | * ThreadId |
| 30 | * ------------------------------------------------------ |
| 31 | */ |
| 32 | |
| 33 | func plat_arm_calc_core_pos |
| 34 | mov x4, x0 |
| 35 | |
| 36 | /* |
| 37 | * The MT bit in MPIDR is always set for morello and the |
| 38 | * affinity level 0 corresponds to thread affinity level. |
| 39 | */ |
| 40 | |
| 41 | /* Extract individual affinity fields from MPIDR */ |
| 42 | ubfx x0, x4, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS |
| 43 | ubfx x1, x4, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS |
| 44 | ubfx x2, x4, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS |
| 45 | ubfx x3, x4, #MPIDR_AFF3_SHIFT, #MPIDR_AFFINITY_BITS |
| 46 | |
| 47 | /* Compute linear position */ |
| 48 | mov x4, #MORELLO_MAX_CLUSTERS_PER_CHIP |
| 49 | madd x2, x3, x4, x2 |
| 50 | mov x4, #MORELLO_MAX_CPUS_PER_CLUSTER |
| 51 | madd x1, x2, x4, x1 |
| 52 | mov x4, #MORELLO_MAX_PE_PER_CPU |
| 53 | madd x0, x1, x4, x0 |
| 54 | ret |
| 55 | endfunc plat_arm_calc_core_pos |