1 /** @file 2 Top level C file for debug support driver. Contains initialization function. 3 4 Copyright (c) 2006 - 2009, 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 "PlDebugSupport.h" 16 17 EFI_DEBUG_SUPPORT_PROTOCOL mDebugSupportProtocolInterface = { 18 EFI_ISA, 19 GetMaximumProcessorIndex, 20 RegisterPeriodicCallback, 21 RegisterExceptionCallback, 22 InvalidateInstructionCache 23 }; 24 25 26 /** 27 Debug Support Driver entry point. 28 29 Checks to see if there's not already a Debug Support protocol installed for 30 the selected processor before installing it. 31 32 @param[in] ImageHandle The firmware allocated handle for the EFI image. 33 @param[in] SystemTable A pointer to the EFI System Table. 34 35 @retval EFI_SUCCESS The entry point is executed successfully. 36 @retval EFI_ALREADY_STARTED Debug Support protocol is installed already. 37 @retval other Some error occurs when executing this entry point. 38 39 **/ 40 EFI_STATUS 41 EFIAPI 42 InitializeDebugSupportDriver ( 43 IN EFI_HANDLE ImageHandle, 44 IN EFI_SYSTEM_TABLE *SystemTable 45 ) 46 { 47 EFI_LOADED_IMAGE_PROTOCOL *LoadedImageProtocolPtr; 48 EFI_STATUS Status; 49 EFI_HANDLE Handle; 50 EFI_HANDLE *HandlePtr; 51 UINTN NumHandles; 52 EFI_DEBUG_SUPPORT_PROTOCOL *DebugSupportProtocolPtr; 53 54 // 55 // First check to see that the debug support protocol for this processor 56 // type is not already installed 57 // 58 Status = gBS->LocateHandleBuffer ( 59 ByProtocol, 60 &gEfiDebugSupportProtocolGuid, 61 NULL, 62 &NumHandles, 63 &HandlePtr 64 ); 65 66 if (Status != EFI_NOT_FOUND) { 67 do { 68 NumHandles--; 69 Status = gBS->OpenProtocol ( 70 HandlePtr[NumHandles], 71 &gEfiDebugSupportProtocolGuid, 72 (VOID **) &DebugSupportProtocolPtr, 73 ImageHandle, 74 NULL, 75 EFI_OPEN_PROTOCOL_GET_PROTOCOL 76 ); 77 if ((Status == EFI_SUCCESS) && (DebugSupportProtocolPtr->Isa == EFI_ISA)) { 78 // 79 // a Debug Support protocol has been installed for this processor 80 // 81 FreePool (HandlePtr); 82 Status = EFI_ALREADY_STARTED; 83 goto ErrExit; 84 } 85 } while (NumHandles > 0); 86 FreePool (HandlePtr); 87 } 88 89 // 90 // Get our image information and install platform specific unload handler 91 // 92 Status = gBS->OpenProtocol ( 93 ImageHandle, 94 &gEfiLoadedImageProtocolGuid, 95 (VOID **) &LoadedImageProtocolPtr, 96 ImageHandle, 97 NULL, 98 EFI_OPEN_PROTOCOL_GET_PROTOCOL 99 ); 100 ASSERT (!EFI_ERROR (Status)); 101 if (Status != EFI_SUCCESS) { 102 goto ErrExit; 103 } 104 105 LoadedImageProtocolPtr->Unload = PlUnloadDebugSupportDriver; 106 107 // 108 // Call hook for processor specific initialization 109 // 110 Status = PlInitializeDebugSupportDriver (); 111 ASSERT (!EFI_ERROR (Status)); 112 if (Status != EFI_SUCCESS) { 113 goto ErrExit; 114 } 115 116 // 117 // Install Debug Support protocol to new handle 118 // 119 Handle = NULL; 120 Status = gBS->InstallProtocolInterface ( 121 &Handle, 122 &gEfiDebugSupportProtocolGuid, 123 EFI_NATIVE_INTERFACE, 124 &mDebugSupportProtocolInterface 125 ); 126 ASSERT (!EFI_ERROR (Status)); 127 if (Status != EFI_SUCCESS) { 128 goto ErrExit; 129 } 130 131 ErrExit: 132 return Status; 133 } 134
