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1 | /*++\r |
2 | \r |
3 | Copyright (c) 2006, Intel Corporation\r |
4 | All rights reserved. This program and the accompanying materials\r |
5 | are licensed and made available under the terms and conditions of the BSD License\r |
6 | which accompanies this distribution. The full text of the license may be found at\r |
7 | http://opensource.org/licenses/bsd-license.php\r |
8 | \r |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
11 | \r |
12 | Module Name:\r |
13 | \r |
14 | ElTorito.c\r |
15 | \r |
16 | Abstract:\r |
17 | \r |
18 | Decode an El Torito formatted CD-ROM\r |
19 | \r |
20 | Revision History\r |
21 | \r |
22 | --*/\r |
23 | \r |
24 | #include "Partition.h"\r |
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25 | \r |
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26 | EFI_STATUS\r |
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27 | PartitionInstallElToritoChildHandles (\r |
28 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r |
29 | IN EFI_HANDLE Handle,\r |
30 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r |
31 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r |
32 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r |
33 | )\r |
34 | /*++\r |
35 | \r |
36 | Routine Description:\r |
37 | Install child handles if the Handle supports El Torito format.\r |
38 | \r |
39 | Arguments:\r |
40 | This - Calling context.\r |
41 | Handle - Parent Handle\r |
42 | DiskIo - Parent DiskIo interface\r |
43 | BlockIo - Parent BlockIo interface\r |
44 | DevicePath - Parent Device Path\r |
45 | \r |
46 | Returns:\r |
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47 | EFI_SUCCESS - some child handle(s) was added\r |
48 | EFI_MEDIA_CHANGED - Media changed Detected\r |
49 | !EFI_SUCCESS - no child handle was added\r |
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50 | \r |
51 | --*/\r |
52 | {\r |
53 | EFI_STATUS Status;\r |
54 | UINT32 VolDescriptorLba;\r |
55 | UINT32 Lba;\r |
56 | EFI_BLOCK_IO_MEDIA *Media;\r |
57 | CDROM_VOLUME_DESCRIPTOR *VolDescriptor;\r |
58 | ELTORITO_CATALOG *Catalog;\r |
59 | UINTN Check;\r |
60 | UINTN Index;\r |
61 | UINTN BootEntry;\r |
62 | UINTN MaxIndex;\r |
63 | UINT16 *CheckBuffer;\r |
64 | CDROM_DEVICE_PATH CdDev;\r |
65 | UINT32 SubBlockSize;\r |
66 | UINT32 SectorCount;\r |
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67 | EFI_STATUS Found;\r |
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68 | UINT32 VolSpaceSize;\r |
69 | \r |
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70 | Found = EFI_NOT_FOUND;\r |
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71 | Media = BlockIo->Media;\r |
72 | VolSpaceSize = 0;\r |
73 | \r |
74 | //\r |
75 | // CD_ROM has the fixed block size as 2048 bytes\r |
76 | //\r |
77 | if (Media->BlockSize != 2048) {\r |
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78 | return EFI_NOT_FOUND;\r |
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79 | }\r |
80 | \r |
81 | VolDescriptor = AllocatePool ((UINTN) Media->BlockSize);\r |
82 | \r |
83 | if (VolDescriptor == NULL) {\r |
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84 | return EFI_NOT_FOUND;\r |
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85 | }\r |
86 | \r |
87 | Catalog = (ELTORITO_CATALOG *) VolDescriptor;\r |
88 | \r |
89 | //\r |
90 | // the ISO-9660 volume descriptor starts at 32k on the media\r |
91 | // and CD_ROM has the fixed block size as 2048 bytes, so...\r |
92 | //\r |
93 | //\r |
94 | // ((16*2048) / Media->BlockSize) - 1;\r |
95 | //\r |
96 | VolDescriptorLba = 15;\r |
97 | //\r |
98 | // Loop: handle one volume descriptor per time\r |
99 | //\r |
100 | while (TRUE) {\r |
101 | \r |
102 | VolDescriptorLba += 1;\r |
103 | if (VolDescriptorLba > Media->LastBlock) {\r |
104 | //\r |
105 | // We are pointing past the end of the device so exit\r |
106 | //\r |
107 | break;\r |
108 | }\r |
109 | \r |
110 | Status = BlockIo->ReadBlocks (\r |
111 | BlockIo,\r |
112 | Media->MediaId,\r |
113 | VolDescriptorLba,\r |
114 | Media->BlockSize,\r |
115 | VolDescriptor\r |
116 | );\r |
117 | if (EFI_ERROR (Status)) {\r |
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118 | Found = Status;\r |
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119 | break;\r |
120 | }\r |
121 | //\r |
122 | // Check for valid volume descriptor signature\r |
123 | //\r |
124 | if (VolDescriptor->Type == CDVOL_TYPE_END ||\r |
125 | CompareMem (VolDescriptor->Id, CDVOL_ID, sizeof (VolDescriptor->Id)) != 0\r |
126 | ) {\r |
127 | //\r |
128 | // end of Volume descriptor list\r |
129 | //\r |
130 | break;\r |
131 | }\r |
132 | //\r |
133 | // Read the Volume Space Size from Primary Volume Descriptor 81-88 byte,\r |
134 | // the 32-bit numerical values is stored in Both-byte orders\r |
135 | //\r |
136 | if (VolDescriptor->Type == CDVOL_TYPE_CODED) {\r |
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137 | VolSpaceSize = VolDescriptor->VolSpaceSize[0];\r |
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138 | }\r |
139 | //\r |
140 | // Is it an El Torito volume descriptor?\r |
141 | //\r |
142 | if (CompareMem (VolDescriptor->SystemId, CDVOL_ELTORITO_ID, sizeof (CDVOL_ELTORITO_ID) - 1) != 0) {\r |
143 | continue;\r |
144 | }\r |
145 | //\r |
146 | // Read in the boot El Torito boot catalog\r |
147 | //\r |
148 | Lba = UNPACK_INT32 (VolDescriptor->EltCatalog);\r |
149 | if (Lba > Media->LastBlock) {\r |
150 | continue;\r |
151 | }\r |
152 | \r |
153 | Status = BlockIo->ReadBlocks (\r |
154 | BlockIo,\r |
155 | Media->MediaId,\r |
156 | Lba,\r |
157 | Media->BlockSize,\r |
158 | Catalog\r |
159 | );\r |
160 | if (EFI_ERROR (Status)) {\r |
161 | DEBUG ((EFI_D_ERROR, "EltCheckDevice: error reading catalog %r\n", Status));\r |
162 | continue;\r |
163 | }\r |
164 | //\r |
165 | // We don't care too much about the Catalog header's contents, but we do want\r |
166 | // to make sure it looks like a Catalog header\r |
167 | //\r |
168 | if (Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG || Catalog->Catalog.Id55AA != 0xAA55) {\r |
169 | DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header IDs not correct\n"));\r |
170 | continue;\r |
171 | }\r |
172 | \r |
173 | Check = 0;\r |
174 | CheckBuffer = (UINT16 *) Catalog;\r |
175 | for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {\r |
176 | Check += CheckBuffer[Index];\r |
177 | }\r |
178 | \r |
179 | if (Check & 0xFFFF) {\r |
180 | DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header checksum failed\n"));\r |
181 | continue;\r |
182 | }\r |
183 | \r |
184 | MaxIndex = Media->BlockSize / sizeof (ELTORITO_CATALOG);\r |
185 | for (Index = 1, BootEntry = 1; Index < MaxIndex; Index += 1) {\r |
186 | //\r |
187 | // Next entry\r |
188 | //\r |
189 | Catalog += 1;\r |
190 | \r |
191 | //\r |
192 | // Check this entry\r |
193 | //\r |
194 | if (Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE || Catalog->Boot.Lba == 0) {\r |
195 | continue;\r |
196 | }\r |
197 | \r |
198 | SubBlockSize = 512;\r |
199 | SectorCount = Catalog->Boot.SectorCount;\r |
200 | \r |
201 | switch (Catalog->Boot.MediaType) {\r |
202 | \r |
203 | case ELTORITO_NO_EMULATION:\r |
204 | SubBlockSize = Media->BlockSize;\r |
205 | break;\r |
206 | \r |
207 | case ELTORITO_HARD_DISK:\r |
208 | break;\r |
209 | \r |
210 | case ELTORITO_12_DISKETTE:\r |
211 | SectorCount = 0x50 * 0x02 * 0x0F;\r |
212 | break;\r |
213 | \r |
214 | case ELTORITO_14_DISKETTE:\r |
215 | SectorCount = 0x50 * 0x02 * 0x12;\r |
216 | break;\r |
217 | \r |
218 | case ELTORITO_28_DISKETTE:\r |
219 | SectorCount = 0x50 * 0x02 * 0x24;\r |
220 | break;\r |
221 | \r |
222 | default:\r |
223 | DEBUG ((EFI_D_INIT, "EltCheckDevice: unsupported El Torito boot media type %x\n", Catalog->Boot.MediaType));\r |
224 | SectorCount = 0;\r |
225 | SubBlockSize = Media->BlockSize;\r |
226 | break;\r |
227 | }\r |
228 | //\r |
229 | // Create child device handle\r |
230 | //\r |
231 | CdDev.Header.Type = MEDIA_DEVICE_PATH;\r |
232 | CdDev.Header.SubType = MEDIA_CDROM_DP;\r |
233 | SetDevicePathNodeLength (&CdDev.Header, sizeof (CdDev));\r |
234 | \r |
235 | if (Index == 1) {\r |
236 | //\r |
237 | // This is the initial/default entry\r |
238 | //\r |
239 | BootEntry = 0;\r |
240 | }\r |
241 | \r |
242 | CdDev.BootEntry = (UINT32) BootEntry;\r |
243 | BootEntry++;\r |
244 | CdDev.PartitionStart = Catalog->Boot.Lba;\r |
245 | if (SectorCount < 2) {\r |
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246 | //\r |
247 | // When the SectorCount < 2, set the Partition as the whole CD.\r |
248 | //\r |
249 | if (VolSpaceSize > (Media->LastBlock + 1)) {\r |
250 | CdDev.PartitionSize = (UINT32)(Media->LastBlock - Catalog->Boot.Lba + 1);\r |
251 | } else {\r |
252 | CdDev.PartitionSize = (UINT32)(VolSpaceSize - Catalog->Boot.Lba);\r |
253 | }\r |
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254 | } else {\r |
255 | CdDev.PartitionSize = DivU64x32 (\r |
256 | MultU64x32 (\r |
257 | SectorCount,\r |
258 | SubBlockSize\r |
259 | ) + Media->BlockSize - 1,\r |
260 | Media->BlockSize\r |
261 | );\r |
262 | }\r |
263 | \r |
264 | Status = PartitionInstallChildHandle (\r |
265 | This,\r |
266 | Handle,\r |
267 | DiskIo,\r |
268 | BlockIo,\r |
269 | DevicePath,\r |
270 | (EFI_DEVICE_PATH_PROTOCOL *) &CdDev,\r |
271 | Catalog->Boot.Lba,\r |
272 | Catalog->Boot.Lba + CdDev.PartitionSize - 1,\r |
273 | SubBlockSize,\r |
274 | FALSE\r |
275 | );\r |
276 | if (!EFI_ERROR (Status)) {\r |
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277 | Found = EFI_SUCCESS;\r |
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278 | }\r |
279 | }\r |
280 | }\r |
281 | \r |
282 | gBS->FreePool (VolDescriptor);\r |
283 | \r |
284 | return Found;\r |
285 | }\r |