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2726 | vana | 1 | /*++ |
2 | |||
3 | Copyright (c) 1998 Intel Corporation |
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4 | |||
5 | Module Name: |
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6 | |||
7 | misc.c |
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8 | |||
9 | Abstract: |
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10 | |||
11 | |||
12 | |||
13 | |||
14 | Revision History |
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15 | |||
16 | --*/ |
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17 | |||
18 | #include "lib.h" |
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19 | |||
20 | |||
21 | // |
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22 | // |
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23 | // |
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24 | |||
25 | VOID * |
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26 | AllocatePool ( |
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27 | IN UINTN Size |
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28 | ) |
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29 | { |
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30 | EFI_STATUS Status; |
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31 | VOID *p; |
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32 | |||
33 | Status = BS->AllocatePool (PoolAllocationType, Size, &p); |
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34 | if (EFI_ERROR(Status)) { |
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35 | DEBUG((D_ERROR, "AllocatePool: out of pool %x\n", Status)); |
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36 | p = NULL; |
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37 | } |
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38 | return p; |
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39 | } |
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40 | |||
41 | VOID * |
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42 | AllocateZeroPool ( |
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43 | IN UINTN Size |
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44 | ) |
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45 | { |
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46 | VOID *p; |
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47 | |||
48 | p = AllocatePool (Size); |
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49 | if (p) { |
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50 | ZeroMem (p, Size); |
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51 | } |
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52 | |||
53 | return p; |
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54 | } |
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55 | |||
56 | VOID * |
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57 | ReallocatePool ( |
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58 | IN VOID *OldPool, |
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59 | IN UINTN OldSize, |
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60 | IN UINTN NewSize |
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61 | ) |
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62 | { |
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63 | VOID *NewPool; |
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64 | |||
65 | NewPool = NULL; |
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66 | if (NewSize) { |
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67 | NewPool = AllocatePool (NewSize); |
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68 | } |
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69 | |||
70 | if (OldPool) { |
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71 | if (NewPool) { |
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72 | CopyMem (NewPool, OldPool, OldSize < NewSize ? OldSize : NewSize); |
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73 | } |
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74 | |||
75 | FreePool (OldPool); |
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76 | } |
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77 | |||
78 | return NewPool; |
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79 | } |
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80 | |||
81 | |||
82 | VOID |
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83 | FreePool ( |
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84 | IN VOID *Buffer |
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85 | ) |
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86 | { |
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87 | BS->FreePool (Buffer); |
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88 | } |
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89 | |||
90 | |||
91 | |||
92 | VOID |
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93 | ZeroMem ( |
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94 | IN VOID *Buffer, |
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95 | IN UINTN Size |
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96 | ) |
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97 | { |
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98 | RtZeroMem (Buffer, Size); |
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99 | } |
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100 | |||
101 | VOID |
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102 | SetMem ( |
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103 | IN VOID *Buffer, |
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104 | IN UINTN Size, |
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105 | IN UINT8 Value |
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106 | ) |
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107 | { |
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108 | RtSetMem (Buffer, Size, Value); |
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109 | } |
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110 | |||
111 | VOID |
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112 | CopyMem ( |
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113 | IN VOID *Dest, |
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114 | IN VOID *Src, |
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115 | IN UINTN len |
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116 | ) |
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117 | { |
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118 | RtCopyMem (Dest, Src, len); |
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119 | } |
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120 | |||
121 | INTN |
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122 | CompareMem ( |
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123 | IN VOID *Dest, |
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124 | IN VOID *Src, |
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125 | IN UINTN len |
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126 | ) |
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127 | { |
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128 | return RtCompareMem (Dest, Src, len); |
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129 | } |
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130 | |||
131 | BOOLEAN |
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132 | GrowBuffer( |
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133 | IN OUT EFI_STATUS *Status, |
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134 | IN OUT VOID **Buffer, |
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135 | IN UINTN BufferSize |
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136 | ) |
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137 | /*++ |
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138 | |||
139 | Routine Description: |
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140 | |||
141 | Helper function called as part of the code needed |
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142 | to allocate the proper sized buffer for various |
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143 | EFI interfaces. |
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144 | |||
145 | Arguments: |
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146 | |||
147 | Status - Current status |
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148 | |||
149 | Buffer - Current allocated buffer, or NULL |
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150 | |||
151 | BufferSize - Current buffer size needed |
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152 | |||
153 | Returns: |
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154 | |||
155 | TRUE - if the buffer was reallocated and the caller |
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156 | should try the API again. |
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157 | |||
158 | --*/ |
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159 | { |
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160 | BOOLEAN TryAgain; |
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161 | |||
162 | // |
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163 | // If this is an initial request, buffer will be null with a new buffer size |
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164 | // |
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165 | |||
166 | if (!*Buffer && BufferSize) { |
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167 | *Status = EFI_BUFFER_TOO_SMALL; |
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168 | } |
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169 | |||
170 | // |
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171 | // If the status code is "buffer too small", resize the buffer |
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172 | // |
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173 | |||
174 | TryAgain = FALSE; |
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175 | if (*Status == EFI_BUFFER_TOO_SMALL) { |
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176 | |||
177 | if (*Buffer) { |
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178 | FreePool (*Buffer); |
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179 | } |
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180 | |||
181 | *Buffer = AllocatePool (BufferSize); |
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182 | |||
183 | if (*Buffer) { |
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184 | TryAgain = TRUE; |
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185 | } else { |
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186 | *Status = EFI_OUT_OF_RESOURCES; |
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187 | } |
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188 | } |
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189 | |||
190 | // |
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191 | // If there's an error, free the buffer |
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192 | // |
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193 | |||
194 | if (!TryAgain && EFI_ERROR(*Status) && *Buffer) { |
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195 | FreePool (*Buffer); |
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196 | *Buffer = NULL; |
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197 | } |
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198 | |||
199 | return TryAgain; |
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200 | } |
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201 | |||
202 | |||
203 | EFI_MEMORY_DESCRIPTOR * |
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204 | LibMemoryMap ( |
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205 | OUT UINTN *NoEntries, |
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206 | OUT UINTN *MapKey, |
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207 | OUT UINTN *DescriptorSize, |
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208 | OUT UINT32 *DescriptorVersion |
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209 | ) |
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210 | { |
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211 | EFI_STATUS Status; |
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212 | EFI_MEMORY_DESCRIPTOR *Buffer; |
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213 | UINTN BufferSize; |
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214 | |||
215 | // |
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216 | // Initialize for GrowBuffer loop |
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217 | // |
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218 | |||
219 | Buffer = NULL; |
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220 | BufferSize = sizeof(EFI_MEMORY_DESCRIPTOR); |
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221 | |||
222 | // |
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223 | // Call the real function |
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224 | // |
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225 | |||
226 | while (GrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) { |
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227 | Status = BS->GetMemoryMap (&BufferSize, Buffer, MapKey, DescriptorSize, DescriptorVersion); |
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228 | } |
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229 | |||
230 | // |
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231 | // Convert buffer size to NoEntries |
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232 | // |
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233 | |||
234 | if (!EFI_ERROR(Status)) { |
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235 | *NoEntries = BufferSize / *DescriptorSize; |
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236 | } |
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237 | |||
238 | return Buffer; |
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239 | } |
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240 | |||
241 | VOID * |
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242 | LibGetVariableAndSize ( |
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243 | IN CHAR16 *Name, |
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244 | IN EFI_GUID *VendorGuid, |
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245 | OUT UINTN *VarSize |
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246 | ) |
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247 | { |
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248 | EFI_STATUS Status; |
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249 | VOID *Buffer; |
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250 | UINTN BufferSize; |
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251 | |||
252 | // |
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253 | // Initialize for GrowBuffer loop |
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254 | // |
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255 | |||
256 | Buffer = NULL; |
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257 | BufferSize = 100; |
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258 | |||
259 | // |
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260 | // Call the real function |
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261 | // |
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262 | |||
263 | while (GrowBuffer (&Status, &Buffer, BufferSize)) { |
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264 | Status = RT->GetVariable ( |
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265 | Name, |
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266 | VendorGuid, |
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267 | NULL, |
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268 | &BufferSize, |
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269 | Buffer |
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270 | ); |
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271 | } |
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272 | if (Buffer) { |
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273 | *VarSize = BufferSize; |
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274 | } else { |
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275 | *VarSize = 0; |
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276 | } |
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277 | return Buffer; |
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278 | } |
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279 | |||
280 | VOID * |
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281 | LibGetVariable ( |
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282 | IN CHAR16 *Name, |
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283 | IN EFI_GUID *VendorGuid |
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284 | ) |
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285 | { |
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286 | UINTN VarSize; |
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287 | |||
288 | return LibGetVariableAndSize (Name, VendorGuid, &VarSize); |
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289 | } |
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290 | |||
291 | EFI_STATUS |
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292 | LibDeleteVariable ( |
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293 | IN CHAR16 *VarName, |
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294 | IN EFI_GUID *VarGuid |
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295 | ) |
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296 | { |
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297 | VOID *VarBuf; |
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298 | EFI_STATUS Status; |
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299 | |||
300 | VarBuf = LibGetVariable(VarName,VarGuid); |
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301 | |||
302 | Status = EFI_NOT_FOUND; |
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303 | |||
304 | if (VarBuf) { |
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305 | // |
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306 | // Delete variable from Storage |
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307 | // |
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308 | Status = RT->SetVariable ( |
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309 | VarName, VarGuid, |
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310 | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE, |
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311 | 0, NULL |
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312 | ); |
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313 | ASSERT (!EFI_ERROR(Status)); |
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314 | FreePool(VarBuf); |
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315 | } |
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316 | |||
317 | return (Status); |
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318 | } |
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319 | |||
320 | EFI_STATUS |
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321 | LibInsertToTailOfBootOrder ( |
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322 | IN UINT16 BootOption, |
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323 | IN BOOLEAN OnlyInsertIfEmpty |
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324 | ) |
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325 | { |
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326 | UINT16 *BootOptionArray; |
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327 | UINT16 *NewBootOptionArray; |
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328 | UINTN VarSize; |
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329 | UINTN Index; |
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330 | EFI_STATUS Status; |
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331 | |||
332 | BootOptionArray = LibGetVariableAndSize (VarBootOrder, &EfiGlobalVariable, &VarSize); |
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333 | if (VarSize != 0 && OnlyInsertIfEmpty) { |
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334 | if (BootOptionArray) { |
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335 | FreePool (BootOptionArray); |
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336 | } |
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337 | return EFI_UNSUPPORTED; |
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338 | } |
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339 | |||
340 | VarSize += sizeof(UINT16); |
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341 | NewBootOptionArray = AllocatePool (VarSize); |
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342 | |||
343 | for (Index = 0; Index < ((VarSize/sizeof(UINT16)) - 1); Index++) { |
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344 | NewBootOptionArray[Index] = BootOptionArray[Index]; |
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345 | } |
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346 | // |
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347 | // Insert in the tail of the array |
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348 | // |
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349 | NewBootOptionArray[Index] = BootOption; |
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350 | |||
351 | Status = RT->SetVariable ( |
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352 | VarBootOrder, &EfiGlobalVariable, |
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353 | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE, |
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354 | VarSize, (VOID*) NewBootOptionArray |
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355 | ); |
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356 | |||
357 | if (NewBootOptionArray) { |
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358 | FreePool (NewBootOptionArray); |
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359 | } |
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360 | if (BootOptionArray) { |
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361 | FreePool (BootOptionArray); |
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362 | } |
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363 | return Status; |
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364 | } |
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365 | |||
366 | |||
367 | BOOLEAN |
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368 | ValidMBR( |
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369 | IN MASTER_BOOT_RECORD *Mbr, |
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370 | IN EFI_BLOCK_IO *BlkIo |
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371 | ) |
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372 | { |
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373 | UINT32 StartingLBA, EndingLBA; |
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374 | UINT32 NewEndingLBA; |
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375 | INTN i, j; |
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376 | BOOLEAN ValidMbr; |
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377 | |||
378 | if (Mbr->Signature != MBR_SIGNATURE) { |
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379 | // |
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380 | // The BPB also has this signature, so it can not be used alone. |
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381 | // |
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382 | return FALSE; |
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383 | } |
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384 | |||
385 | ValidMbr = FALSE; |
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386 | for (i=0; i<MAX_MBR_PARTITIONS; i++) { |
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387 | if ( Mbr->Partition[i].OSIndicator == 0x00 || EXTRACT_UINT32(Mbr->Partition[i].SizeInLBA) == 0 ) { |
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388 | continue; |
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389 | } |
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390 | ValidMbr = TRUE; |
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391 | StartingLBA = EXTRACT_UINT32(Mbr->Partition[i].StartingLBA); |
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392 | EndingLBA = StartingLBA + EXTRACT_UINT32(Mbr->Partition[i].SizeInLBA) - 1; |
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393 | if (EndingLBA > BlkIo->Media->LastBlock) { |
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394 | // |
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395 | // Compatability Errata: |
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396 | // Some systems try to hide drive space with thier INT 13h driver |
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397 | // This does not hide space from the OS driver. This means the MBR |
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398 | // that gets created from DOS is smaller than the MBR created from |
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399 | // a real OS (NT & Win98). This leads to BlkIo->LastBlock being |
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400 | // wrong on some systems FDISKed by the OS. |
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401 | // |
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402 | // |
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403 | if (BlkIo->Media->LastBlock < MIN_MBR_DEVICE_SIZE) { |
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404 | // |
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405 | // If this is a very small device then trust the BlkIo->LastBlock |
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406 | // |
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407 | return FALSE; |
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408 | } |
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409 | |||
410 | if (EndingLBA > (BlkIo->Media->LastBlock + MBR_ERRATA_PAD)) { |
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411 | return FALSE; |
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412 | } |
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413 | |||
414 | } |
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415 | for (j=i+1; j<MAX_MBR_PARTITIONS; j++) { |
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416 | if (Mbr->Partition[j].OSIndicator == 0x00 || EXTRACT_UINT32(Mbr->Partition[j].SizeInLBA) == 0) { |
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417 | continue; |
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418 | } |
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419 | if ( EXTRACT_UINT32(Mbr->Partition[j].StartingLBA) >= StartingLBA && |
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420 | EXTRACT_UINT32(Mbr->Partition[j].StartingLBA) <= EndingLBA ) { |
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421 | // |
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422 | // The Start of this region overlaps with the i'th region |
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423 | // |
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424 | return FALSE; |
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425 | } |
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426 | NewEndingLBA = EXTRACT_UINT32(Mbr->Partition[j].StartingLBA) + EXTRACT_UINT32(Mbr->Partition[j].SizeInLBA) - 1; |
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427 | if ( NewEndingLBA >= StartingLBA && NewEndingLBA <= EndingLBA ) { |
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428 | // |
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429 | // The End of this region overlaps with the i'th region |
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430 | // |
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431 | return FALSE; |
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432 | } |
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433 | } |
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434 | } |
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435 | // |
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436 | // Non of the regions overlapped so MBR is O.K. |
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437 | // |
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438 | return ValidMbr; |
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439 | } |
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440 | |||
441 | |||
442 | UINT8 |
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443 | DecimaltoBCD( |
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444 | IN UINT8 DecValue |
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445 | ) |
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446 | { |
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447 | return RtDecimaltoBCD (DecValue); |
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448 | } |
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449 | |||
450 | |||
451 | UINT8 |
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452 | BCDtoDecimal( |
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453 | IN UINT8 BcdValue |
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454 | ) |
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455 | { |
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456 | return RtBCDtoDecimal (BcdValue); |
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457 | } |
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458 | |||
459 | EFI_STATUS |
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460 | LibGetSystemConfigurationTable( |
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461 | IN EFI_GUID *TableGuid, |
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462 | IN OUT VOID **Table |
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463 | ) |
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464 | |||
465 | { |
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466 | UINTN Index; |
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467 | |||
468 | for(Index=0;Index<ST->NumberOfTableEntries;Index++) { |
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469 | if (CompareGuid(TableGuid,&(ST->ConfigurationTable[Index].VendorGuid))==0) { |
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470 | *Table = ST->ConfigurationTable[Index].VendorTable; |
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471 | return EFI_SUCCESS; |
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472 | } |
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473 | } |
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474 | return EFI_NOT_FOUND; |
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475 | } |
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476 | |||
477 | |||
478 | CHAR16 * |
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479 | LibGetUiString ( |
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480 | IN EFI_HANDLE Handle, |
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481 | IN UI_STRING_TYPE StringType, |
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482 | IN ISO_639_2 *LangCode, |
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483 | IN BOOLEAN ReturnDevicePathStrOnMismatch |
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484 | ) |
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485 | { |
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486 | UI_INTERFACE *Ui; |
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487 | UI_STRING_TYPE Index; |
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488 | UI_STRING_ENTRY *Array; |
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489 | EFI_STATUS Status; |
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490 | |||
491 | Status = BS->HandleProtocol (Handle, &UiProtocol, (VOID *)&Ui); |
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492 | if (EFI_ERROR(Status)) { |
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493 | return (ReturnDevicePathStrOnMismatch) ? DevicePathToStr(DevicePathFromHandle(Handle)) : NULL; |
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494 | } |
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495 | |||
496 | // |
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497 | // Skip the first strings |
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498 | // |
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499 | for (Index = UiDeviceString, Array = Ui->Entry; Index < StringType; Index++, Array++) { |
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500 | while (Array->LangCode) { |
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501 | Array++; |
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502 | } |
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503 | } |
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504 | |||
505 | // |
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506 | // Search for the match |
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507 | // |
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508 | while (Array->LangCode) { |
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509 | if (strcmpa (Array->LangCode, LangCode) == 0) { |
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510 | return Array->UiString; |
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511 | } |
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512 | } |
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513 | return (ReturnDevicePathStrOnMismatch) ? DevicePathToStr(DevicePathFromHandle(Handle)) : NULL; |
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514 | } |