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6aac772c CC |
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 | |
bcdcc416 MK |
28 | IN PEI_FAT_PRIVATE_DATA *PrivateData,\r |
29 | IN UINTN ParentBlockDevNo\r | |
6aac772c CC |
30 | )\r |
31 | {\r | |
bcdcc416 MK |
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 | |
6aac772c CC |
47 | \r |
48 | if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {\r | |
49 | return FALSE;\r | |
50 | }\r | |
51 | \r | |
bcdcc416 MK |
52 | Found = FALSE;\r |
53 | ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);\r | |
54 | VolSpaceSize = 0;\r | |
6aac772c CC |
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 | |
bcdcc416 MK |
63 | VolDescriptor = (CDROM_VOLUME_DESCRIPTOR *)PrivateData->BlockData;\r |
64 | Catalog = (ELTORITO_CATALOG *)VolDescriptor;\r | |
6aac772c CC |
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 | |
6aac772c CC |
77 | VolDescriptorLba += 1;\r |
78 | if (VolDescriptorLba > ParentBlockDev->LastBlock) {\r | |
79 | //\r | |
80 | // We are pointing past the end of the device so exit\r | |
81 | //\r | |
82 | break;\r | |
83 | }\r | |
84 | \r | |
85 | Status = FatReadBlock (\r | |
bcdcc416 MK |
86 | PrivateData,\r |
87 | ParentBlockDevNo,\r | |
88 | VolDescriptorLba,\r | |
89 | ParentBlockDev->BlockSize,\r | |
90 | VolDescriptor\r | |
91 | );\r | |
6aac772c CC |
92 | if (EFI_ERROR (Status)) {\r |
93 | break;\r | |
94 | }\r | |
bcdcc416 | 95 | \r |
6aac772c CC |
96 | //\r |
97 | // Check for valid volume descriptor signature\r | |
98 | //\r | |
bcdcc416 MK |
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 | |
6aac772c CC |
103 | //\r |
104 | // end of Volume descriptor list\r | |
105 | //\r | |
106 | break;\r | |
107 | }\r | |
bcdcc416 | 108 | \r |
6aac772c CC |
109 | //\r |
110 | // Read the Volume Space Size from Primary Volume Descriptor 81-88 byte\r | |
111 | //\r | |
112 | if (VolDescriptor->Unknown.Type == CDVOL_TYPE_CODED) {\r | |
113 | VolSpaceSize = VolDescriptor->PrimaryVolume.VolSpaceSize[1];\r | |
114 | }\r | |
bcdcc416 | 115 | \r |
6aac772c CC |
116 | //\r |
117 | // Is it an El Torito volume descriptor?\r | |
118 | //\r | |
119 | if (CompareMem (\r | |
120 | VolDescriptor->BootRecordVolume.SystemId,\r | |
121 | CDVOL_ELTORITO_ID,\r | |
122 | sizeof (CDVOL_ELTORITO_ID) - 1\r | |
bcdcc416 MK |
123 | ) != 0)\r |
124 | {\r | |
6aac772c CC |
125 | continue;\r |
126 | }\r | |
bcdcc416 | 127 | \r |
6aac772c CC |
128 | //\r |
129 | // Read in the boot El Torito boot catalog\r | |
130 | //\r | |
131 | Lba = UNPACK_INT32 (VolDescriptor->BootRecordVolume.EltCatalog);\r | |
132 | if (Lba > ParentBlockDev->LastBlock) {\r | |
133 | continue;\r | |
134 | }\r | |
135 | \r | |
136 | Status = FatReadBlock (\r | |
bcdcc416 MK |
137 | PrivateData,\r |
138 | ParentBlockDevNo,\r | |
139 | Lba,\r | |
140 | ParentBlockDev->BlockSize,\r | |
141 | Catalog\r | |
142 | );\r | |
6aac772c CC |
143 | if (EFI_ERROR (Status)) {\r |
144 | continue;\r | |
145 | }\r | |
bcdcc416 | 146 | \r |
6aac772c CC |
147 | //\r |
148 | // We don't care too much about the Catalog header's contents, but we do want\r | |
149 | // to make sure it looks like a Catalog header\r | |
150 | //\r | |
bcdcc416 | 151 | if ((Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG) || (Catalog->Catalog.Id55AA != 0xAA55)) {\r |
6aac772c CC |
152 | continue;\r |
153 | }\r | |
154 | \r | |
155 | Check = 0;\r | |
bcdcc416 | 156 | CheckBuffer = (UINT16 *)Catalog;\r |
6aac772c CC |
157 | for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {\r |
158 | Check += CheckBuffer[Index];\r | |
159 | }\r | |
160 | \r | |
161 | if ((Check & 0xFFFF) != 0) {\r | |
162 | continue;\r | |
163 | }\r | |
164 | \r | |
165 | MaxIndex = ParentBlockDev->BlockSize / sizeof (ELTORITO_CATALOG);\r | |
166 | for (Index = 1; Index < MaxIndex; Index += 1) {\r | |
167 | //\r | |
168 | // Next entry\r | |
169 | //\r | |
170 | Catalog += 1;\r | |
171 | \r | |
172 | //\r | |
173 | // Check this entry\r | |
174 | //\r | |
bcdcc416 | 175 | if ((Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE) || (Catalog->Boot.Lba == 0)) {\r |
6aac772c CC |
176 | continue;\r |
177 | }\r | |
178 | \r | |
bcdcc416 MK |
179 | SubBlockSize = 512;\r |
180 | SectorCount = Catalog->Boot.SectorCount;\r | |
6aac772c CC |
181 | \r |
182 | switch (Catalog->Boot.MediaType) {\r | |
bcdcc416 MK |
183 | case ELTORITO_NO_EMULATION:\r |
184 | SubBlockSize = ParentBlockDev->BlockSize;\r | |
185 | SectorCount = Catalog->Boot.SectorCount;\r | |
186 | break;\r | |
187 | \r | |
188 | case ELTORITO_HARD_DISK:\r | |
189 | break;\r | |
190 | \r | |
191 | case ELTORITO_12_DISKETTE:\r | |
192 | SectorCount = 0x50 * 0x02 * 0x0F;\r | |
193 | break;\r | |
194 | \r | |
195 | case ELTORITO_14_DISKETTE:\r | |
196 | SectorCount = 0x50 * 0x02 * 0x12;\r | |
197 | break;\r | |
198 | \r | |
199 | case ELTORITO_28_DISKETTE:\r | |
200 | SectorCount = 0x50 * 0x02 * 0x24;\r | |
201 | break;\r | |
202 | \r | |
203 | default:\r | |
204 | SectorCount = 0;\r | |
205 | SubBlockSize = ParentBlockDev->BlockSize;\r | |
206 | break;\r | |
6aac772c CC |
207 | }\r |
208 | \r | |
209 | if (SectorCount < 2) {\r | |
bcdcc416 | 210 | SectorCount = (VolSpaceSize > ParentBlockDev->LastBlock + 1) ? (UINT32)(ParentBlockDev->LastBlock - Catalog->Boot.Lba + 1) : (UINT32)(VolSpaceSize - Catalog->Boot.Lba);\r |
6aac772c | 211 | }\r |
bcdcc416 | 212 | \r |
6aac772c CC |
213 | //\r |
214 | // Register this partition\r | |
215 | //\r | |
216 | if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {\r | |
bcdcc416 | 217 | Found = TRUE;\r |
6aac772c | 218 | \r |
bcdcc416 | 219 | BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);\r |
6aac772c | 220 | \r |
bcdcc416 MK |
221 | BlockDev->BlockSize = SubBlockSize;\r |
222 | BlockDev->LastBlock = SectorCount - 1;\r | |
223 | BlockDev->IoAlign = ParentBlockDev->IoAlign;\r | |
224 | BlockDev->Logical = TRUE;\r | |
225 | BlockDev->PartitionChecked = FALSE;\r | |
226 | BlockDev->StartingPos = MultU64x32 (Catalog->Boot.Lba, ParentBlockDev->BlockSize);\r | |
227 | BlockDev->ParentDevNo = ParentBlockDevNo;\r | |
6aac772c CC |
228 | \r |
229 | PrivateData->BlockDeviceCount++;\r | |
230 | }\r | |
231 | }\r | |
232 | }\r | |
233 | \r | |
234 | ParentBlockDev->PartitionChecked = TRUE;\r | |
235 | \r | |
236 | return Found;\r | |
6aac772c | 237 | }\r |