UefiCpuPkg/CpuDxe/CpuMp.h

   1 /** @file
   2   CPU DXE MP support
   3
   4   Copyright (c) 2006 - 2014, 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 #ifndef _CPU_MP_H_
  16 #define _CPU_MP_H_
  17
  18 #include <Protocol/MpService.h>
  19 #include <Library/SynchronizationLib.h>
  20
  21 /**
  22   Initialize Multi-processor support.
  23
  24 **/
  25 VOID
  26 InitializeMpSupport (
  27   VOID
  28   );
  29
  30 typedef
  31 VOID
  32 (EFIAPI *STACKLESS_AP_ENTRY_POINT)(
  33   VOID
  34   );
  35
  36 /**
  37   Starts the Application Processors and directs them to jump to the
  38   specified routine.
  39
  40   The processor jumps to this code in flat mode, but the processor's
  41   stack is not initialized.
  42
  43   @param ApEntryPoint    Pointer to the Entry Point routine
  44
  45   @retval EFI_SUCCESS           The APs were started
  46   @retval EFI_OUT_OF_RESOURCES  Cannot allocate memory to start APs
  47
  48 **/
  49 EFI_STATUS
  50 StartApsStackless (
  51   IN STACKLESS_AP_ENTRY_POINT ApEntryPoint
  52   );
  53
  54 /**
  55   The AP entry point that the Startup-IPI target code will jump to.
  56
  57   The processor jumps to this code in flat mode, but the processor's
  58   stack is not initialized.
  59
  60 **/
  61 VOID
  62 EFIAPI
  63 AsmApEntryPoint (
  64   VOID
  65   );
  66
  67 /**
  68   Releases the lock preventing other APs from using the shared AP
  69   stack.
  70
  71   Once the AP has transitioned to using a new stack, it can call this
  72   function to allow another AP to proceed with using the shared stack.
  73
  74 **/
  75 VOID
  76 EFIAPI
  77 AsmApDoneWithCommonStack (
  78   VOID
  79   );
  80
  81 typedef enum {
  82   CpuStateIdle,
  83   CpuStateBlocked,
  84   CpuStateReady,
  85   CpuStateBuzy,
  86   CpuStateFinished
  87 } CPU_STATE;
  88
  89 /**
  90   Define Individual Processor Data block.
  91
  92 **/
  93 typedef struct {
  94   EFI_PROCESSOR_INFORMATION      Info;
  95   SPIN_LOCK                      CpuDataLock;
  96   volatile CPU_STATE             State;
  97
  98   EFI_AP_PROCEDURE               Procedure;
  99   VOID                           *Parameter;
 100 } CPU_DATA_BLOCK;
 101
 102 /**
 103   Define MP data block which consumes individual processor block.
 104
 105 **/
 106 typedef struct {
 107   CPU_DATA_BLOCK              *CpuDatas;
 108   UINTN                       NumberOfProcessors;
 109   UINTN                       NumberOfEnabledProcessors;
 110 } MP_SYSTEM_DATA;
 111
 112 /**
 113   This function is called by all processors (both BSP and AP) once and collects MP related data.
 114
 115   @param Bsp             TRUE if the CPU is BSP
 116   @param ProcessorNumber The specific processor number
 117
 118   @retval EFI_SUCCESS    Data for the processor collected and filled in
 119
 120 **/
 121 EFI_STATUS
 122 FillInProcessorInformation (
 123   IN     BOOLEAN              Bsp,
 124   IN     UINTN                ProcessorNumber
 125   );
 126
 127 /**
 128   This service retrieves the number of logical processor in the platform
 129   and the number of those logical processors that are enabled on this boot.
 130   This service may only be called from the BSP.
 131
 132   This function is used to retrieve the following information:
 133     - The number of logical processors that are present in the system.
 134     - The number of enabled logical processors in the system at the instant
 135       this call is made.
 136
 137   Because MP Service Protocol provides services to enable and disable processors
 138   dynamically, the number of enabled logical processors may vary during the
 139   course of a boot session.
 140
 141   If this service is called from an AP, then EFI_DEVICE_ERROR is returned.
 142   If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then
 143   EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors
 144   is returned in NumberOfProcessors, the number of currently enabled processor
 145   is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.
 146
 147   @param[in]  This                        A pointer to the EFI_MP_SERVICES_PROTOCOL
 148                                           instance.
 149   @param[out] NumberOfProcessors          Pointer to the total number of logical
 150                                           processors in the system, including the BSP
 151                                           and disabled APs.
 152   @param[out] NumberOfEnabledProcessors   Pointer to the number of enabled logical
 153                                           processors that exist in system, including
 154                                           the BSP.
 155
 156   @retval EFI_SUCCESS             The number of logical processors and enabled
 157                                   logical processors was retrieved.
 158   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 159   @retval EFI_INVALID_PARAMETER   NumberOfProcessors is NULL.
 160   @retval EFI_INVALID_PARAMETER   NumberOfEnabledProcessors is NULL.
 161
 162 **/
 163 EFI_STATUS
 164 EFIAPI
 165 GetNumberOfProcessors (
 166   IN  EFI_MP_SERVICES_PROTOCOL  *This,
 167   OUT UINTN                     *NumberOfProcessors,
 168   OUT UINTN                     *NumberOfEnabledProcessors
 169   );
 170
 171 /**
 172   This return the handle number for the calling processor.  This service may be
 173   called from the BSP and APs.
 174
 175   This service returns the processor handle number for the calling processor.
 176   The returned value is in the range from 0 to the total number of logical
 177   processors minus 1. The total number of logical processors can be retrieved
 178   with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be
 179   called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER
 180   is returned. Otherwise, the current processors handle number is returned in
 181   ProcessorNumber, and EFI_SUCCESS is returned.
 182
 183   @param[in]  This             A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
 184   @param[out] ProcessorNumber  The handle number of AP that is to become the new
 185                                BSP. The range is from 0 to the total number of
 186                                logical processors minus 1. The total number of
 187                                logical processors can be retrieved by
 188                                EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
 189
 190   @retval EFI_SUCCESS             The current processor handle number was returned
 191                                   in ProcessorNumber.
 192   @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.
 193
 194 **/
 195 EFI_STATUS
 196 EFIAPI
 197 WhoAmI (
 198   IN EFI_MP_SERVICES_PROTOCOL  *This,
 199   OUT UINTN                    *ProcessorNumber
 200   );
 201
 202 #endif // _CPU_MP_H_
 203