plat/qemu/topology.c

   1 /*
   2  * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <stdint.h>
   8
   9 #include <platform_def.h>
  10
  11 #include <arch.h>
  12
  13 #include "qemu_private.h"
  14
  15 /* The power domain tree descriptor */
  16 static unsigned char power_domain_tree_desc[] = {
  17         /* Number of root nodes */
  18         PLATFORM_CLUSTER_COUNT,
  19         /* Number of children for the first node */
  20         PLATFORM_CLUSTER0_CORE_COUNT,
  21         /* Number of children for the second node */
  22         PLATFORM_CLUSTER1_CORE_COUNT,
  23 };
  24
  25 /*******************************************************************************
  26  * This function returns the ARM default topology tree information.
  27  ******************************************************************************/
  28 const unsigned char *plat_get_power_domain_tree_desc(void)
  29 {
  30         return power_domain_tree_desc;
  31 }
  32
  33 /*******************************************************************************
  34  * This function implements a part of the critical interface between the psci
  35  * generic layer and the platform that allows the former to query the platform
  36  * to convert an MPIDR to a unique linear index. An error code (-1) is returned
  37  * in case the MPIDR is invalid.
  38  ******************************************************************************/
  39 int plat_core_pos_by_mpidr(u_register_t mpidr)
  40 {
  41         unsigned int cluster_id, cpu_id;
  42
  43         mpidr &= MPIDR_AFFINITY_MASK;
  44         if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK))
  45                 return -1;
  46
  47         cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
  48         cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
  49
  50         if (cluster_id >= PLATFORM_CLUSTER_COUNT)
  51                 return -1;
  52
  53         if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER)
  54                 return -1;
  55
  56         return plat_qemu_calc_core_pos(mpidr);
  57 }