1 /*++ 2 3 Copyright (c) 2004 - 2012, Intel Corporation. All rights reserved.<BR> 4 This program and the accompanying materials 5 are licensed and made available under the terms and conditions of the BSD License 6 which accompanies this distribution. The full text of the license may be found at 7 http://opensource.org/licenses/bsd-license.php 8 9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 12 Module Name: 13 14 Handle.c 15 16 Abstract: 17 18 Support for Handle lib fucntions. 19 20 --*/ 21 22 #include "Tiano.h" 23 #include "EfiDriverLib.h" 24 25 EFI_STATUS 26 EfiLibLocateHandleProtocolByProtocols ( 27 IN OUT EFI_HANDLE * Handle, OPTIONAL 28 OUT VOID **Interface, OPTIONAL 29 ... 30 ) 31 /*++ 32 Routine Description: 33 34 Function locates Protocol and/or Handle on which all Protocols specified 35 as a variable list are installed. 36 It supports continued search. The caller must assure that no handles are added 37 or removed while performing continued search, by e.g., rising the TPL and not 38 calling any handle routines. Otherwise the behavior is undefined. 39 40 Arguments: 41 42 Handle - The address of handle to receive the handle on which protocols 43 indicated by the variable list are installed. 44 If points to NULL, all handles are searched. If pointing to a 45 handle returned from previous call, searches starting from next handle. 46 If NULL, the parameter is ignored. 47 48 Interface - The address of a pointer to a protocol interface that will receive 49 the interface indicated by first variable argument. 50 If NULL, the parameter is ignored. 51 52 ... - A variable argument list containing protocol GUIDs. Must end with NULL. 53 54 Returns: 55 56 EFI_SUCCESS - All the protocols where found on same handle. 57 EFI_NOT_FOUND - A Handle with all the protocols installed was not found. 58 Other values as may be returned from LocateHandleBuffer() or HandleProtocol(). 59 60 --*/ 61 { 62 VA_LIST args; 63 EFI_STATUS Status; 64 EFI_GUID *Protocol; 65 EFI_GUID *ProtocolFirst; 66 EFI_HANDLE *HandleBuffer; 67 UINTN NumberOfHandles; 68 UINTN Idx; 69 VOID *AnInterface; 70 71 AnInterface = NULL; 72 VA_START (args, Interface); 73 ProtocolFirst = VA_ARG (args, EFI_GUID *); 74 VA_END (args); 75 76 // 77 // Get list of all handles that support the first protocol. 78 // 79 Status = gBS->LocateHandleBuffer ( 80 ByProtocol, 81 ProtocolFirst, 82 NULL, 83 &NumberOfHandles, 84 &HandleBuffer 85 ); 86 if (EFI_ERROR (Status)) { 87 return Status; 88 } 89 90 // 91 // Check if this is a countinuation of handle searching. 92 // 93 Idx = 0; 94 if ((Handle != NULL) && (*Handle != NULL)) { 95 // 96 // Leave the Idx just beyond the matching handle. 97 // 98 for (; Idx < NumberOfHandles;) { 99 if (*Handle == HandleBuffer[Idx++]) { 100 break; 101 } 102 } 103 } 104 105 // 106 // Iterate handles testing for presence of remaining protocols. 107 // 108 for (; Idx < NumberOfHandles; Idx++) { 109 110 // 111 // Start with the second protocol, the first one is sure on this handle. 112 // 113 VA_START (args, Interface); 114 Protocol = VA_ARG (args, EFI_GUID *); 115 116 // 117 // Iterate protocols from the variable list. 118 // 119 while (TRUE) { 120 121 Protocol = VA_ARG (args, EFI_GUID *); 122 123 if (Protocol == NULL) { 124 125 // 126 // If here, the list was iterated successfully 127 // finding each protocol on a single handle. 128 // 129 130 Status = EFI_SUCCESS; 131 132 // 133 // OPTIONAL parameter returning the Handle. 134 // 135 if (Handle != NULL) { 136 *Handle = HandleBuffer[Idx]; 137 } 138 139 // 140 // OPTIONAL parameter returning the first rotocol's Interface. 141 // 142 if (Interface != NULL) { 143 Status = gBS->HandleProtocol ( 144 HandleBuffer[Idx], 145 ProtocolFirst, 146 Interface 147 ); 148 } 149 150 VA_END (args); 151 152 goto lbl_out; 153 } 154 155 Status = gBS->HandleProtocol ( 156 HandleBuffer[Idx], 157 Protocol, 158 &AnInterface 159 ); 160 if (EFI_ERROR (Status)) { 161 162 // 163 // This handle does not have the iterated protocol. 164 // 165 break; 166 } 167 } 168 169 VA_END (args); 170 } 171 172 // 173 // If here, no handle that bears all the protocols was found. 174 // 175 Status = EFI_NOT_FOUND; 176 177 lbl_out: 178 gBS->FreePool (HandleBuffer); 179 return Status; 180 } 181
