UefiCpuPkg/CpuMpPei/PeiMpServices.c

   1 /** @file
   2   Implementation of Multiple Processor PPI services.
   3
   4   Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "PeiMpServices.h"
  16
  17
  18
  19 /**
  20   Find the current Processor number by APIC ID.
  21
  22   @param PeiCpuMpData        Pointer to PEI CPU MP Data
  23   @param ProcessorNumber     Return the pocessor number found
  24
  25   @retval EFI_SUCCESS        ProcessorNumber is found and returned.
  26   @retval EFI_NOT_FOUND      ProcessorNumber is not found.
  27 **/
  28 EFI_STATUS
  29 GetProcessorNumber (
  30   IN PEI_CPU_MP_DATA         *PeiCpuMpData,
  31   OUT UINTN                  *ProcessorNumber
  32   )
  33 {
  34   UINTN                   TotalProcessorNumber;
  35   UINTN                   Index;
  36
  37   TotalProcessorNumber = PeiCpuMpData->CpuCount;
  38   for (Index = 0; Index < TotalProcessorNumber; Index ++) {
  39     if (PeiCpuMpData->CpuData[Index].ApicId == GetInitialApicId ()) {
  40       *ProcessorNumber = Index;
  41       return EFI_SUCCESS;
  42     }
  43   }
  44   return EFI_NOT_FOUND;
  45 }
  46
  47
  48 /**
  49   This return the handle number for the calling processor.  This service may be
  50   called from the BSP and APs.
  51
  52   This service returns the processor handle number for the calling processor.
  53   The returned value is in the range from 0 to the total number of logical
  54   processors minus 1. The total number of logical processors can be retrieved
  55   with EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors(). This service may be
  56   called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER
  57   is returned. Otherwise, the current processors handle number is returned in
  58   ProcessorNumber, and EFI_SUCCESS is returned.
  59
  60   @param[in]  PeiServices         An indirect pointer to the PEI Services Table
  61                                   published by the PEI Foundation.
  62   @param[in]  This                A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
  63   @param[out] ProcessorNumber     The handle number of the AP. The range is from 0 to the
  64                                   total number of logical processors minus 1. The total
  65                                   number of logical processors can be retrieved by
  66                                   EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
  67
  68   @retval EFI_SUCCESS             The current processor handle number was returned in
  69                                   ProcessorNumber.
  70   @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.
  71 **/
  72 EFI_STATUS
  73 EFIAPI
  74 PeiWhoAmI (
  75   IN  CONST EFI_PEI_SERVICES   **PeiServices,
  76   IN  EFI_PEI_MP_SERVICES_PPI  *This,
  77   OUT UINTN                    *ProcessorNumber
  78   )
  79 {
  80   PEI_CPU_MP_DATA         *PeiCpuMpData;
  81
  82   PeiCpuMpData = GetMpHobData ();
  83   if (PeiCpuMpData == NULL) {
  84     return EFI_NOT_FOUND;
  85   }
  86
  87   if (ProcessorNumber == NULL) {
  88     return EFI_INVALID_PARAMETER;
  89   }
  90
  91   return GetProcessorNumber (PeiCpuMpData, ProcessorNumber);
  92 }
  93