2 CPU Features DXE driver to initialize CPU features.
4 Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <Library/BaseLib.h>
12 #include <Library/DebugLib.h>
13 #include <Library/UefiLib.h>
14 #include <Library/UefiBootServicesTableLib.h>
15 #include <Library/RegisterCpuFeaturesLib.h>
16 #include <Library/HobLib.h>
18 #include <Protocol/SmmConfiguration.h>
19 #include <Guid/CpuFeaturesInitDone.h>
22 Worker function to perform CPU feature initialization.
26 CpuFeaturesInitializeWorker (
35 CpuFeaturesInitialize ();
38 // Install CPU Features Init Done Protocol
41 Status
= gBS
->InstallProtocolInterface (
43 &gEdkiiCpuFeaturesInitDoneGuid
,
47 ASSERT_EFI_ERROR (Status
);
51 Event notification that initialize CPU features when gEfiSmmConfigurationProtocol installs.
53 @param[in] Event The Event that is being processed, not used.
54 @param[in] Context Event Context, not used.
58 SmmConfigurationEventNotify (
64 EFI_SMM_CONFIGURATION_PROTOCOL
*SmmConfiguration
;
67 // Make sure this notification is for this handler
69 Status
= gBS
->LocateProtocol (&gEfiSmmConfigurationProtocolGuid
, NULL
, (VOID
**)&SmmConfiguration
);
70 if (EFI_ERROR (Status
)) {
74 CpuFeaturesInitializeWorker ();
78 CPU Features driver entry point function.
80 If PcdCpuFeaturesInitAfterSmmRelocation is TRUE, it will register one
81 SMM Configuration Protocol notify function to perform CPU features
82 initialization. Otherwise, it will perform CPU features initialization
85 @param ImageHandle Image handle this driver.
86 @param SystemTable Pointer to the System Table.
88 @retval EFI_SUCCESS CPU Features is initialized successfully.
92 CpuFeaturesDxeInitialize (
93 IN EFI_HANDLE ImageHandle
,
94 IN EFI_SYSTEM_TABLE
*SystemTable
101 if (GetFirstGuidHob (&gEdkiiCpuFeaturesInitDoneGuid
) != NULL
) {
103 // Try to find HOB first. This HOB exist means CPU features have
104 // been initialized by CpuFeaturesPei driver, just install
105 // gEdkiiCpuFeaturesInitDoneGuid.
108 Status
= gBS
->InstallProtocolInterface (
110 &gEdkiiCpuFeaturesInitDoneGuid
,
111 EFI_NATIVE_INTERFACE
,
114 ASSERT_EFI_ERROR (Status
);
118 if (PcdGetBool (PcdCpuFeaturesInitAfterSmmRelocation
)) {
120 // Install notification callback on SMM Configuration Protocol
122 EfiCreateProtocolNotifyEvent (
123 &gEfiSmmConfigurationProtocolGuid
,
125 SmmConfigurationEventNotify
,
130 CpuFeaturesInitializeWorker ();