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1 | /** @file\r |
2 | Routines supporting partition discovery and\r | |
3 | logical device reading\r | |
4 | \r | |
5 | Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r | |
6 | \r | |
eb6cb4ce | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
6aac772c CC |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <IndustryStandard/ElTorito.h>\r | |
12 | #include "FatLitePeim.h"\r | |
13 | \r | |
14 | /**\r | |
15 | This function finds Eltorito partitions. Main algorithm\r | |
16 | is ported from DXE partition driver.\r | |
17 | \r | |
18 | @param[in] PrivateData The global memory map\r | |
19 | @param[in] ParentBlockDevNo The parent block device\r | |
20 | \r | |
21 | @retval TRUE New partitions are detected and logical block devices\r | |
22 | are added to block device array\r | |
23 | @retval FALSE No new partitions are added\r | |
24 | \r | |
25 | **/\r | |
26 | BOOLEAN\r | |
27 | FatFindEltoritoPartitions (\r | |
28 | IN PEI_FAT_PRIVATE_DATA *PrivateData,\r | |
29 | IN UINTN ParentBlockDevNo\r | |
30 | )\r | |
31 | {\r | |
32 | EFI_STATUS Status;\r | |
33 | BOOLEAN Found;\r | |
34 | PEI_FAT_BLOCK_DEVICE *BlockDev;\r | |
35 | PEI_FAT_BLOCK_DEVICE *ParentBlockDev;\r | |
36 | UINT32 VolDescriptorLba;\r | |
37 | UINT32 Lba;\r | |
38 | CDROM_VOLUME_DESCRIPTOR *VolDescriptor;\r | |
39 | ELTORITO_CATALOG *Catalog;\r | |
40 | UINTN Check;\r | |
41 | UINTN Index;\r | |
42 | UINTN MaxIndex;\r | |
43 | UINT16 *CheckBuffer;\r | |
44 | UINT32 SubBlockSize;\r | |
45 | UINT32 SectorCount;\r | |
46 | UINT32 VolSpaceSize;\r | |
47 | \r | |
48 | if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {\r | |
49 | return FALSE;\r | |
50 | }\r | |
51 | \r | |
52 | Found = FALSE;\r | |
53 | ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);\r | |
54 | VolSpaceSize = 0;\r | |
55 | \r | |
56 | //\r | |
57 | // CD_ROM has the fixed block size as 2048 bytes\r | |
58 | //\r | |
59 | if (ParentBlockDev->BlockSize != 2048) {\r | |
60 | return FALSE;\r | |
61 | }\r | |
62 | \r | |
63 | VolDescriptor = (CDROM_VOLUME_DESCRIPTOR *) PrivateData->BlockData;\r | |
64 | Catalog = (ELTORITO_CATALOG *) VolDescriptor;\r | |
65 | \r | |
66 | //\r | |
67 | // the ISO-9660 volume descriptor starts at 32k on the media\r | |
68 | // and CD_ROM has the fixed block size as 2048 bytes, so...\r | |
69 | //\r | |
70 | VolDescriptorLba = 15;\r | |
71 | //\r | |
72 | // ((16*2048) / Media->BlockSize) - 1;\r | |
73 | //\r | |
74 | // Loop: handle one volume descriptor per time\r | |
75 | //\r | |
76 | while (TRUE) {\r | |
77 | \r | |
78 | VolDescriptorLba += 1;\r | |
79 | if (VolDescriptorLba > ParentBlockDev->LastBlock) {\r | |
80 | //\r | |
81 | // We are pointing past the end of the device so exit\r | |
82 | //\r | |
83 | break;\r | |
84 | }\r | |
85 | \r | |
86 | Status = FatReadBlock (\r | |
87 | PrivateData,\r | |
88 | ParentBlockDevNo,\r | |
89 | VolDescriptorLba,\r | |
90 | ParentBlockDev->BlockSize,\r | |
91 | VolDescriptor\r | |
92 | );\r | |
93 | if (EFI_ERROR (Status)) {\r | |
94 | break;\r | |
95 | }\r | |
96 | //\r | |
97 | // Check for valid volume descriptor signature\r | |
98 | //\r | |
99 | if (VolDescriptor->Unknown.Type == CDVOL_TYPE_END ||\r | |
100 | CompareMem (VolDescriptor->Unknown.Id, CDVOL_ID, sizeof (VolDescriptor->Unknown.Id)) != 0\r | |
101 | ) {\r | |
102 | //\r | |
103 | // end of Volume descriptor list\r | |
104 | //\r | |
105 | break;\r | |
106 | }\r | |
107 | //\r | |
108 | // Read the Volume Space Size from Primary Volume Descriptor 81-88 byte\r | |
109 | //\r | |
110 | if (VolDescriptor->Unknown.Type == CDVOL_TYPE_CODED) {\r | |
111 | VolSpaceSize = VolDescriptor->PrimaryVolume.VolSpaceSize[1];\r | |
112 | }\r | |
113 | //\r | |
114 | // Is it an El Torito volume descriptor?\r | |
115 | //\r | |
116 | if (CompareMem (\r | |
117 | VolDescriptor->BootRecordVolume.SystemId,\r | |
118 | CDVOL_ELTORITO_ID,\r | |
119 | sizeof (CDVOL_ELTORITO_ID) - 1\r | |
120 | ) != 0) {\r | |
121 | continue;\r | |
122 | }\r | |
123 | //\r | |
124 | // Read in the boot El Torito boot catalog\r | |
125 | //\r | |
126 | Lba = UNPACK_INT32 (VolDescriptor->BootRecordVolume.EltCatalog);\r | |
127 | if (Lba > ParentBlockDev->LastBlock) {\r | |
128 | continue;\r | |
129 | }\r | |
130 | \r | |
131 | Status = FatReadBlock (\r | |
132 | PrivateData,\r | |
133 | ParentBlockDevNo,\r | |
134 | Lba,\r | |
135 | ParentBlockDev->BlockSize,\r | |
136 | Catalog\r | |
137 | );\r | |
138 | if (EFI_ERROR (Status)) {\r | |
139 | continue;\r | |
140 | }\r | |
141 | //\r | |
142 | // We don't care too much about the Catalog header's contents, but we do want\r | |
143 | // to make sure it looks like a Catalog header\r | |
144 | //\r | |
145 | if (Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG || Catalog->Catalog.Id55AA != 0xAA55) {\r | |
146 | continue;\r | |
147 | }\r | |
148 | \r | |
149 | Check = 0;\r | |
150 | CheckBuffer = (UINT16 *) Catalog;\r | |
151 | for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {\r | |
152 | Check += CheckBuffer[Index];\r | |
153 | }\r | |
154 | \r | |
155 | if ((Check & 0xFFFF) != 0) {\r | |
156 | continue;\r | |
157 | }\r | |
158 | \r | |
159 | MaxIndex = ParentBlockDev->BlockSize / sizeof (ELTORITO_CATALOG);\r | |
160 | for (Index = 1; Index < MaxIndex; Index += 1) {\r | |
161 | //\r | |
162 | // Next entry\r | |
163 | //\r | |
164 | Catalog += 1;\r | |
165 | \r | |
166 | //\r | |
167 | // Check this entry\r | |
168 | //\r | |
169 | if (Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE || Catalog->Boot.Lba == 0) {\r | |
170 | continue;\r | |
171 | }\r | |
172 | \r | |
173 | SubBlockSize = 512;\r | |
174 | SectorCount = Catalog->Boot.SectorCount;\r | |
175 | \r | |
176 | switch (Catalog->Boot.MediaType) {\r | |
177 | \r | |
178 | case ELTORITO_NO_EMULATION:\r | |
179 | SubBlockSize = ParentBlockDev->BlockSize;\r | |
180 | SectorCount = Catalog->Boot.SectorCount;\r | |
181 | break;\r | |
182 | \r | |
183 | case ELTORITO_HARD_DISK:\r | |
184 | break;\r | |
185 | \r | |
186 | case ELTORITO_12_DISKETTE:\r | |
187 | SectorCount = 0x50 * 0x02 * 0x0F;\r | |
188 | break;\r | |
189 | \r | |
190 | case ELTORITO_14_DISKETTE:\r | |
191 | SectorCount = 0x50 * 0x02 * 0x12;\r | |
192 | break;\r | |
193 | \r | |
194 | case ELTORITO_28_DISKETTE:\r | |
195 | SectorCount = 0x50 * 0x02 * 0x24;\r | |
196 | break;\r | |
197 | \r | |
198 | default:\r | |
199 | SectorCount = 0;\r | |
200 | SubBlockSize = ParentBlockDev->BlockSize;\r | |
201 | break;\r | |
202 | }\r | |
203 | \r | |
204 | if (SectorCount < 2) {\r | |
205 | SectorCount = (VolSpaceSize > ParentBlockDev->LastBlock + 1) ? (UINT32) (ParentBlockDev->LastBlock - Catalog->Boot.Lba + 1) : (UINT32) (VolSpaceSize - Catalog->Boot.Lba);\r | |
206 | }\r | |
207 | //\r | |
208 | // Register this partition\r | |
209 | //\r | |
210 | if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {\r | |
211 | \r | |
212 | Found = TRUE;\r | |
213 | \r | |
214 | BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);\r | |
215 | \r | |
216 | BlockDev->BlockSize = SubBlockSize;\r | |
217 | BlockDev->LastBlock = SectorCount - 1;\r | |
218 | BlockDev->IoAlign = ParentBlockDev->IoAlign;\r | |
219 | BlockDev->Logical = TRUE;\r | |
220 | BlockDev->PartitionChecked = FALSE;\r | |
221 | BlockDev->StartingPos = MultU64x32 (Catalog->Boot.Lba, ParentBlockDev->BlockSize);\r | |
222 | BlockDev->ParentDevNo = ParentBlockDevNo;\r | |
223 | \r | |
224 | PrivateData->BlockDeviceCount++;\r | |
225 | }\r | |
226 | }\r | |
227 | }\r | |
228 | \r | |
229 | ParentBlockDev->PartitionChecked = TRUE;\r | |
230 | \r | |
231 | return Found;\r | |
232 | \r | |
233 | }\r |