UefiCpuPkg/Library/CpuCommonFeaturesLib/PendingBreak.c

   1 /** @file
   2   Pending Break feature.
   3
   4   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "CpuCommonFeatures.h"
  10
  11 /**
  12   Detects if Pending Break feature supported on current processor.
  13
  14   @param[in]  ProcessorNumber  The index of the CPU executing this function.
  15   @param[in]  CpuInfo          A pointer to the REGISTER_CPU_FEATURE_INFORMATION
  16                                structure for the CPU executing this function.
  17   @param[in]  ConfigData       A pointer to the configuration buffer returned
  18                                by CPU_FEATURE_GET_CONFIG_DATA.  NULL if
  19                                CPU_FEATURE_GET_CONFIG_DATA was not provided in
  20                                RegisterCpuFeature().
  21
  22   @retval TRUE     Pending Break feature is supported.
  23   @retval FALSE    Pending Break feature is not supported.
  24
  25   @note This service could be called by BSP/APs.
  26 **/
  27 BOOLEAN
  28 EFIAPI
  29 PendingBreakSupport (
  30   IN UINTN                             ProcessorNumber,
  31   IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  32   IN VOID                              *ConfigData  OPTIONAL
  33   )
  34 {
  35   if (IS_ATOM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
  36       IS_CORE2_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
  37       IS_CORE_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
  38       IS_PENTIUM_4_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
  39       IS_PENTIUM_M_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {
  40     return (CpuInfo->CpuIdVersionInfoEdx.Bits.PBE == 1);
  41   }
  42   return FALSE;
  43 }
  44
  45 /**
  46   Initializes Pending Break feature to specific state.
  47
  48   @param[in]  ProcessorNumber  The index of the CPU executing this function.
  49   @param[in]  CpuInfo          A pointer to the REGISTER_CPU_FEATURE_INFORMATION
  50                                structure for the CPU executing this function.
  51   @param[in]  ConfigData       A pointer to the configuration buffer returned
  52                                by CPU_FEATURE_GET_CONFIG_DATA.  NULL if
  53                                CPU_FEATURE_GET_CONFIG_DATA was not provided in
  54                                RegisterCpuFeature().
  55   @param[in]  State            If TRUE, then the Pending Break feature must be enabled.
  56                                If FALSE, then the Pending Break feature must be disabled.
  57
  58   @retval RETURN_SUCCESS       Pending Break feature is initialized.
  59
  60   @note This service could be called by BSP only.
  61 **/
  62 RETURN_STATUS
  63 EFIAPI
  64 PendingBreakInitialize (
  65   IN UINTN                             ProcessorNumber,
  66   IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  67   IN VOID                              *ConfigData,  OPTIONAL
  68   IN BOOLEAN                           State
  69   )
  70 {
  71   //
  72   // The scope of the MSR_ATOM_IA32_MISC_ENABLE is core for below processor type, only program
  73   // MSR_ATOM_IA32_MISC_ENABLE for thread 0 in each core.
  74   //
  75   // Support function has check the processer type for this feature, no need to check again
  76   // here.
  77   //
  78   if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
  79     return RETURN_SUCCESS;
  80   }
  81
  82   //
  83   // ATOM, CORE2, CORE, PENTIUM_4 and IS_PENTIUM_M_PROCESSOR have the same MSR index,
  84   // Simply use MSR_ATOM_IA32_MISC_ENABLE here
  85   //
  86   CPU_REGISTER_TABLE_WRITE_FIELD (
  87     ProcessorNumber,
  88     Msr,
  89     MSR_ATOM_IA32_MISC_ENABLE,
  90     MSR_ATOM_IA32_MISC_ENABLE_REGISTER,
  91     Bits.FERR,
  92     (State) ? 1 : 0
  93     );
  94   return RETURN_SUCCESS;
  95 }