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1 | /** @file\r |
2 | Decode an El Torito formatted CD-ROM\r |
3 | \r |
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4 | Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r |
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5 | This program and the accompanying materials\r |
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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 |
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12 | \r |
13 | **/\r |
14 | \r |
15 | \r |
16 | #include "Partition.h"\r |
17 | \r |
18 | \r |
19 | /**\r |
20 | Install child handles if the Handle supports El Torito format.\r |
21 | \r |
22 | @param[in] This Calling context.\r |
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23 | @param[in] Handle Parent Handle.\r |
24 | @param[in] DiskIo Parent DiskIo interface.\r |
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25 | @param[in] DiskIo2 Parent DiskIo2 interface.\r |
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26 | @param[in] BlockIo Parent BlockIo interface.\r |
27 | @param[in] BlockIo2 Parent BlockIo2 interface.\r |
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28 | @param[in] DevicePath Parent Device Path\r |
29 | \r |
30 | \r |
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31 | @retval EFI_SUCCESS Child handle(s) was added.\r |
32 | @retval EFI_MEDIA_CHANGED Media changed Detected.\r |
33 | @retval other no child handle was added.\r |
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34 | \r |
35 | **/\r |
36 | EFI_STATUS\r |
37 | PartitionInstallElToritoChildHandles (\r |
38 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r |
39 | IN EFI_HANDLE Handle,\r |
40 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r |
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41 | IN EFI_DISK_IO2_PROTOCOL *DiskIo2,\r |
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42 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r |
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43 | IN EFI_BLOCK_IO2_PROTOCOL *BlockIo2,\r |
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44 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r |
45 | )\r |
46 | {\r |
47 | EFI_STATUS Status;\r |
48 | UINT32 VolDescriptorLba;\r |
49 | UINT32 Lba;\r |
50 | EFI_BLOCK_IO_MEDIA *Media;\r |
51 | CDROM_VOLUME_DESCRIPTOR *VolDescriptor;\r |
52 | ELTORITO_CATALOG *Catalog;\r |
53 | UINTN Check;\r |
54 | UINTN Index;\r |
55 | UINTN BootEntry;\r |
56 | UINTN MaxIndex;\r |
57 | UINT16 *CheckBuffer;\r |
58 | CDROM_DEVICE_PATH CdDev;\r |
59 | UINT32 SubBlockSize;\r |
60 | UINT32 SectorCount;\r |
61 | EFI_STATUS Found;\r |
62 | UINT32 VolSpaceSize;\r |
63 | \r |
64 | Found = EFI_NOT_FOUND;\r |
65 | Media = BlockIo->Media;\r |
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66 | \r |
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67 | VolSpaceSize = 0;\r |
68 | \r |
69 | //\r |
70 | // CD_ROM has the fixed block size as 2048 bytes\r |
71 | //\r |
72 | if (Media->BlockSize != 2048) {\r |
73 | return EFI_NOT_FOUND;\r |
74 | }\r |
75 | \r |
76 | VolDescriptor = AllocatePool ((UINTN) Media->BlockSize);\r |
77 | \r |
78 | if (VolDescriptor == NULL) {\r |
79 | return EFI_NOT_FOUND;\r |
80 | }\r |
81 | \r |
82 | Catalog = (ELTORITO_CATALOG *) VolDescriptor;\r |
83 | \r |
84 | //\r |
85 | // the ISO-9660 volume descriptor starts at 32k on the media\r |
86 | // and CD_ROM has the fixed block size as 2048 bytes, so...\r |
87 | //\r |
88 | //\r |
89 | // ((16*2048) / Media->BlockSize) - 1;\r |
90 | //\r |
91 | VolDescriptorLba = 15;\r |
92 | //\r |
93 | // Loop: handle one volume descriptor per time\r |
94 | //\r |
95 | while (TRUE) {\r |
96 | \r |
97 | VolDescriptorLba += 1;\r |
98 | if (VolDescriptorLba > Media->LastBlock) {\r |
99 | //\r |
100 | // We are pointing past the end of the device so exit\r |
101 | //\r |
102 | break;\r |
103 | }\r |
104 | \r |
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105 | Status = DiskIo->ReadDisk (\r |
106 | DiskIo,\r |
107 | Media->MediaId,\r |
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108 | MultU64x32 (VolDescriptorLba, Media->BlockSize),\r |
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109 | Media->BlockSize,\r |
110 | VolDescriptor\r |
111 | );\r |
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112 | if (EFI_ERROR (Status)) {\r |
113 | Found = Status;\r |
114 | break;\r |
115 | }\r |
116 | //\r |
117 | // Check for valid volume descriptor signature\r |
118 | //\r |
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119 | if (VolDescriptor->Unknown.Type == CDVOL_TYPE_END ||\r |
120 | CompareMem (VolDescriptor->Unknown.Id, CDVOL_ID, sizeof (VolDescriptor->Unknown.Id)) != 0\r |
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121 | ) {\r |
122 | //\r |
123 | // end of Volume descriptor list\r |
124 | //\r |
125 | break;\r |
126 | }\r |
127 | //\r |
128 | // Read the Volume Space Size from Primary Volume Descriptor 81-88 byte,\r |
129 | // the 32-bit numerical values is stored in Both-byte orders\r |
130 | //\r |
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131 | if (VolDescriptor->PrimaryVolume.Type == CDVOL_TYPE_CODED) {\r |
132 | VolSpaceSize = VolDescriptor->PrimaryVolume.VolSpaceSize[0];\r |
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133 | }\r |
134 | //\r |
135 | // Is it an El Torito volume descriptor?\r |
136 | //\r |
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137 | if (CompareMem (VolDescriptor->BootRecordVolume.SystemId, CDVOL_ELTORITO_ID, sizeof (CDVOL_ELTORITO_ID) - 1) != 0) {\r |
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138 | continue;\r |
139 | }\r |
140 | //\r |
141 | // Read in the boot El Torito boot catalog\r |
142 | //\r |
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143 | Lba = UNPACK_INT32 (VolDescriptor->BootRecordVolume.EltCatalog);\r |
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144 | if (Lba > Media->LastBlock) {\r |
145 | continue;\r |
146 | }\r |
147 | \r |
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148 | Status = DiskIo->ReadDisk (\r |
149 | DiskIo,\r |
150 | Media->MediaId,\r |
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151 | MultU64x32 (Lba, Media->BlockSize),\r |
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152 | Media->BlockSize,\r |
153 | Catalog\r |
154 | );\r |
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155 | if (EFI_ERROR (Status)) {\r |
156 | DEBUG ((EFI_D_ERROR, "EltCheckDevice: error reading catalog %r\n", Status));\r |
157 | continue;\r |
158 | }\r |
159 | //\r |
160 | // We don't care too much about the Catalog header's contents, but we do want\r |
161 | // to make sure it looks like a Catalog header\r |
162 | //\r |
163 | if (Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG || Catalog->Catalog.Id55AA != 0xAA55) {\r |
164 | DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header IDs not correct\n"));\r |
165 | continue;\r |
166 | }\r |
167 | \r |
168 | Check = 0;\r |
169 | CheckBuffer = (UINT16 *) Catalog;\r |
170 | for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {\r |
171 | Check += CheckBuffer[Index];\r |
172 | }\r |
173 | \r |
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174 | if ((Check & 0xFFFF) != 0) {\r |
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175 | DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header checksum failed\n"));\r |
176 | continue;\r |
177 | }\r |
178 | \r |
179 | MaxIndex = Media->BlockSize / sizeof (ELTORITO_CATALOG);\r |
180 | for (Index = 1, BootEntry = 1; Index < MaxIndex; Index += 1) {\r |
181 | //\r |
182 | // Next entry\r |
183 | //\r |
184 | Catalog += 1;\r |
185 | \r |
186 | //\r |
187 | // Check this entry\r |
188 | //\r |
189 | if (Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE || Catalog->Boot.Lba == 0) {\r |
190 | continue;\r |
191 | }\r |
192 | \r |
193 | SubBlockSize = 512;\r |
194 | SectorCount = Catalog->Boot.SectorCount;\r |
195 | \r |
196 | switch (Catalog->Boot.MediaType) {\r |
197 | \r |
198 | case ELTORITO_NO_EMULATION:\r |
199 | SubBlockSize = Media->BlockSize;\r |
200 | break;\r |
201 | \r |
202 | case ELTORITO_HARD_DISK:\r |
203 | break;\r |
204 | \r |
205 | case ELTORITO_12_DISKETTE:\r |
206 | SectorCount = 0x50 * 0x02 * 0x0F;\r |
207 | break;\r |
208 | \r |
209 | case ELTORITO_14_DISKETTE:\r |
210 | SectorCount = 0x50 * 0x02 * 0x12;\r |
211 | break;\r |
212 | \r |
213 | case ELTORITO_28_DISKETTE:\r |
214 | SectorCount = 0x50 * 0x02 * 0x24;\r |
215 | break;\r |
216 | \r |
217 | default:\r |
218 | DEBUG ((EFI_D_INIT, "EltCheckDevice: unsupported El Torito boot media type %x\n", Catalog->Boot.MediaType));\r |
219 | SectorCount = 0;\r |
220 | SubBlockSize = Media->BlockSize;\r |
221 | break;\r |
222 | }\r |
223 | //\r |
224 | // Create child device handle\r |
225 | //\r |
226 | CdDev.Header.Type = MEDIA_DEVICE_PATH;\r |
227 | CdDev.Header.SubType = MEDIA_CDROM_DP;\r |
228 | SetDevicePathNodeLength (&CdDev.Header, sizeof (CdDev));\r |
229 | \r |
230 | if (Index == 1) {\r |
231 | //\r |
232 | // This is the initial/default entry\r |
233 | //\r |
234 | BootEntry = 0;\r |
235 | }\r |
236 | \r |
237 | CdDev.BootEntry = (UINT32) BootEntry;\r |
238 | BootEntry++;\r |
239 | CdDev.PartitionStart = Catalog->Boot.Lba;\r |
240 | if (SectorCount < 2) {\r |
241 | //\r |
242 | // When the SectorCount < 2, set the Partition as the whole CD.\r |
243 | //\r |
244 | if (VolSpaceSize > (Media->LastBlock + 1)) {\r |
245 | CdDev.PartitionSize = (UINT32)(Media->LastBlock - Catalog->Boot.Lba + 1);\r |
246 | } else {\r |
247 | CdDev.PartitionSize = (UINT32)(VolSpaceSize - Catalog->Boot.Lba);\r |
248 | }\r |
249 | } else {\r |
250 | CdDev.PartitionSize = DivU64x32 (\r |
251 | MultU64x32 (\r |
252 | SectorCount,\r |
253 | SubBlockSize\r |
254 | ) + Media->BlockSize - 1,\r |
255 | Media->BlockSize\r |
256 | );\r |
257 | }\r |
258 | \r |
259 | Status = PartitionInstallChildHandle (\r |
260 | This,\r |
261 | Handle,\r |
262 | DiskIo,\r |
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263 | DiskIo2,\r |
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264 | BlockIo,\r |
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265 | BlockIo2,\r |
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266 | DevicePath,\r |
267 | (EFI_DEVICE_PATH_PROTOCOL *) &CdDev,\r |
268 | Catalog->Boot.Lba,\r |
269 | Catalog->Boot.Lba + CdDev.PartitionSize - 1,\r |
270 | SubBlockSize,\r |
271 | FALSE\r |
272 | );\r |
273 | if (!EFI_ERROR (Status)) {\r |
274 | Found = EFI_SUCCESS;\r |
275 | }\r |
276 | }\r |
277 | }\r |
278 | \r |
279 | FreePool (VolDescriptor);\r |
280 | \r |
281 | return Found;\r |
282 | }\r |