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1 | /** @file\r |
2 | HOB Library.\r |
3 | \r |
4 | Copyright (c) 2006, Intel Corporation<BR>\r |
5 | All rights reserved. This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r |
8 | http://opensource.org/licenses/bsd-license.php\r |
9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
12 | \r |
13 | Module Name: HobLib.c\r |
14 | \r |
15 | **/\r |
16 | \r |
17 | \r |
18 | \r |
19 | /**\r |
20 | Returns the pointer to the HOB list.\r |
21 | \r |
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22 | This function returns the pointer to first HOB in the list.\r |
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23 | \r |
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24 | @return The pointer to the HOB list.\r |
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25 | \r |
26 | **/\r |
27 | VOID *\r |
28 | EFIAPI\r |
29 | GetHobList (\r |
30 | VOID\r |
31 | )\r |
32 | {\r |
33 | EFI_STATUS Status;\r |
34 | VOID *HobList;\r |
35 | \r |
36 | Status = PeiCoreGetHobList (&HobList);\r |
37 | ASSERT_EFI_ERROR (Status);\r |
38 | ASSERT (HobList != NULL);\r |
39 | \r |
40 | return HobList;\r |
41 | }\r |
42 | \r |
43 | /**\r |
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44 | Returns the next instance of a HOB type from the starting HOB.\r |
45 | \r |
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46 | This function searches the first instance of a HOB type from the starting HOB pointer. \r |
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47 | If there does not exist such HOB type from the starting HOB pointer, it will return NULL.\r |
48 | In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer\r |
49 | unconditionally: it returns HobStart back if HobStart itself meets the requirement;\r |
50 | caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.\r |
51 | If HobStart is NULL, then ASSERT().\r |
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52 | \r |
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53 | @param Type The HOB type to return.\r |
54 | @param HobStart The starting HOB pointer to search from.\r |
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55 | \r |
56 | @return The next instance of a HOB type from the starting HOB.\r |
57 | \r |
58 | **/\r |
59 | VOID *\r |
60 | EFIAPI\r |
61 | GetNextHob (\r |
62 | IN UINT16 Type,\r |
63 | IN CONST VOID *HobStart\r |
64 | )\r |
65 | {\r |
66 | EFI_PEI_HOB_POINTERS Hob;\r |
67 | \r |
68 | ASSERT (HobStart != NULL);\r |
69 | \r |
70 | Hob.Raw = (UINT8 *) HobStart;\r |
71 | //\r |
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72 | // Parse the HOB list until end of list or matching type is found.\r |
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73 | //\r |
74 | while (!END_OF_HOB_LIST (Hob)) {\r |
75 | if (Hob.Header->HobType == Type) {\r |
76 | return Hob.Raw;\r |
77 | }\r |
78 | Hob.Raw = GET_NEXT_HOB (Hob);\r |
79 | }\r |
80 | return NULL;\r |
81 | }\r |
82 | \r |
83 | /**\r |
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84 | Returns the first instance of a HOB type among the whole HOB list.\r |
85 | \r |
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86 | This function searches the first instance of a HOB type among the whole HOB list. \r |
87 | If there does not exist such HOB type in the HOB list, it will return NULL. \r |
88 | \r |
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89 | @param Type The HOB type to return.\r |
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90 | \r |
91 | @return The next instance of a HOB type from the starting HOB.\r |
92 | \r |
93 | **/\r |
94 | VOID *\r |
95 | EFIAPI\r |
96 | GetFirstHob (\r |
97 | IN UINT16 Type\r |
98 | )\r |
99 | {\r |
100 | VOID *HobList;\r |
101 | \r |
102 | HobList = GetHobList ();\r |
103 | return GetNextHob (Type, HobList);\r |
104 | }\r |
105 | \r |
106 | /**\r |
107 | This function searches the first instance of a HOB from the starting HOB pointer. \r |
108 | Such HOB should satisfy two conditions: \r |
109 | its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid. \r |
110 | If there does not exist such HOB from the starting HOB pointer, it will return NULL. \r |
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111 | Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()\r |
112 | to extract the data section and its size info respectively.\r |
113 | In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer\r |
114 | unconditionally: it returns HobStart back if HobStart itself meets the requirement;\r |
115 | caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.\r |
116 | If Guid is NULL, then ASSERT().\r |
117 | If HobStart is NULL, then ASSERT().\r |
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118 | \r |
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119 | @param Guid The GUID to match with in the HOB list.\r |
120 | @param HobStart A pointer to a Guid.\r |
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121 | \r |
122 | @return The next instance of the matched GUID HOB from the starting HOB.\r |
123 | \r |
124 | **/\r |
125 | VOID *\r |
126 | EFIAPI\r |
127 | GetNextGuidHob (\r |
128 | IN CONST EFI_GUID *Guid,\r |
129 | IN CONST VOID *HobStart\r |
130 | )\r |
131 | {\r |
132 | EFI_PEI_HOB_POINTERS GuidHob;\r |
133 | \r |
134 | GuidHob.Raw = (UINT8 *) HobStart;\r |
135 | while ((GuidHob.Raw = GetNextHob (EFI_HOB_TYPE_GUID_EXTENSION, GuidHob.Raw)) != NULL) {\r |
136 | if (CompareGuid (Guid, &GuidHob.Guid->Name)) {\r |
137 | break;\r |
138 | }\r |
139 | GuidHob.Raw = GET_NEXT_HOB (GuidHob);\r |
140 | }\r |
141 | return GuidHob.Raw;\r |
142 | }\r |
143 | \r |
144 | /**\r |
145 | This function searches the first instance of a HOB among the whole HOB list. \r |
146 | Such HOB should satisfy two conditions:\r |
147 | its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid.\r |
148 | If there does not exist such HOB from the starting HOB pointer, it will return NULL.\r |
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149 | Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()\r |
150 | to extract the data section and its size info respectively.\r |
151 | If Guid is NULL, then ASSERT().\r |
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152 | \r |
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153 | @param Guid The GUID to match with in the HOB list.\r |
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154 | \r |
155 | @return The first instance of the matched GUID HOB among the whole HOB list.\r |
156 | \r |
157 | **/\r |
158 | VOID *\r |
159 | EFIAPI\r |
160 | GetFirstGuidHob (\r |
161 | IN CONST EFI_GUID *Guid\r |
162 | )\r |
163 | {\r |
164 | VOID *HobList;\r |
165 | \r |
166 | HobList = GetHobList ();\r |
167 | return GetNextGuidHob (Guid, HobList);\r |
168 | }\r |
169 | \r |
170 | /**\r |
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171 | Adds a new HOB to the HOB List.\r |
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172 | \r |
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173 | This internal function enables PEIMs to create various types of HOBs.\r |
174 | \r |
175 | @param Type Type of the new HOB.\r |
176 | @param Length Length of the new HOB to allocate.\r |
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177 | \r |
178 | @return The address of new HOB.\r |
179 | \r |
180 | **/\r |
181 | VOID *\r |
182 | InternalPeiCreateHob (\r |
183 | IN UINT16 Type,\r |
184 | IN UINT16 Length\r |
185 | )\r |
186 | {\r |
187 | EFI_STATUS Status;\r |
188 | VOID *Hob;\r |
189 | \r |
190 | Status = PeiCoreCreateHob (Type, Length, &Hob);\r |
191 | //\r |
192 | // Assume the process of HOB building is always successful.\r |
193 | //\r |
194 | ASSERT_EFI_ERROR (Status);\r |
195 | return Hob;\r |
196 | }\r |
197 | \r |
198 | /**\r |
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199 | Builds a HOB for a loaded PE32 module.\r |
200 | \r |
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201 | This function builds a HOB for a loaded PE32 module.\r |
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202 | It can only be invoked during PEI phase;\r |
203 | for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r |
204 | If ModuleName is NULL, then ASSERT().\r |
205 | If there is no additional space for HOB creation, then ASSERT().\r |
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206 | \r |
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207 | @param ModuleName The GUID File Name of the module.\r |
208 | @param MemoryAllocationModule The 64 bit physical address of the module.\r |
209 | @param ModuleLength The length of the module in bytes.\r |
210 | Content-type: text/html
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