| 1 | /** @file
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| 2 | FAT file system access routines for FAT recovery PEIM
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| 3 |
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| 4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | #include "FatLitePeim.h"
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| 11 |
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| 12 |
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| 13 | /**
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| 14 | Check if there is a valid FAT in the corresponding Block device
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| 15 | of the volume and if yes, fill in the relevant fields for the
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| 16 | volume structure. Note there should be a valid Block device number
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| 17 | already set.
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| 18 |
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| 19 | @param PrivateData Global memory map for accessing global
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| 20 | variables.
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| 21 | @param Volume On input, the BlockDeviceNumber field of the
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| 22 | Volume should be a valid value. On successful
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| 23 | output, all fields except the VolumeNumber
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| 24 | field is initialized.
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| 25 |
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| 26 | @retval EFI_SUCCESS A FAT is found and the volume structure is
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| 27 | initialized.
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| 28 | @retval EFI_NOT_FOUND There is no FAT on the corresponding device.
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| 29 | @retval EFI_DEVICE_ERROR There is something error while accessing device.
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| 30 |
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| 31 | **/
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| 32 | EFI_STATUS
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| 33 | FatGetBpbInfo (
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| 34 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 35 | IN OUT PEI_FAT_VOLUME *Volume
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| 36 | )
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| 37 | {
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| 38 | EFI_STATUS Status;
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| 39 | PEI_FAT_BOOT_SECTOR Bpb;
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| 40 | PEI_FAT_BOOT_SECTOR_EX BpbEx;
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| 41 | UINT32 Sectors;
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| 42 | UINT32 SectorsPerFat;
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| 43 | UINT32 RootDirSectors;
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| 44 | UINT64 FatLba;
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| 45 | UINT64 RootLba;
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| 46 | UINT64 FirstClusterLba;
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| 47 |
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| 48 | //
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| 49 | // Read in the BPB
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| 50 | //
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| 51 | Status = FatReadDisk (
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| 52 | PrivateData,
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| 53 | Volume->BlockDeviceNo,
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| 54 | 0,
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| 55 | sizeof (PEI_FAT_BOOT_SECTOR_EX),
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| 56 | &BpbEx
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| 57 | );
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| 58 | if (EFI_ERROR (Status)) {
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| 59 | return Status;
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| 60 | }
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| 61 |
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| 62 | CopyMem (
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| 63 | (UINT8 *) (&Bpb),
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| 64 | (UINT8 *) (&BpbEx),
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| 65 | sizeof (PEI_FAT_BOOT_SECTOR)
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| 66 | );
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| 67 |
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| 68 | Volume->FatType = FatUnknown;
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| 69 |
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| 70 | Sectors = Bpb.Sectors;
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| 71 | if (Sectors == 0) {
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| 72 | Sectors = Bpb.LargeSectors;
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| 73 | }
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| 74 |
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| 75 | SectorsPerFat = Bpb.SectorsPerFat;
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| 76 | if (SectorsPerFat == 0) {
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| 77 | SectorsPerFat = BpbEx.LargeSectorsPerFat;
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| 78 | Volume->FatType = Fat32;
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| 79 | }
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| 80 | //
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| 81 | // Filter out those not a FAT
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| 82 | //
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| 83 | if (Bpb.Ia32Jump[0] != 0xe9 && Bpb.Ia32Jump[0] != 0xeb && Bpb.Ia32Jump[0] != 0x49) {
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| 84 | return EFI_NOT_FOUND;
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| 85 | }
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| 86 |
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| 87 | if (Bpb.ReservedSectors == 0 || Bpb.NoFats == 0 || Sectors == 0) {
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| 88 | return EFI_NOT_FOUND;
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| 89 | }
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| 90 |
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| 91 | if (Bpb.SectorsPerCluster != 1 &&
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| 92 | Bpb.SectorsPerCluster != 2 &&
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| 93 | Bpb.SectorsPerCluster != 4 &&
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| 94 | Bpb.SectorsPerCluster != 8 &&
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| 95 | Bpb.SectorsPerCluster != 16 &&
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| 96 | Bpb.SectorsPerCluster != 32 &&
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| 97 | Bpb.SectorsPerCluster != 64 &&
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| 98 | Bpb.SectorsPerCluster != 128
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| 99 | ) {
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| 100 | return EFI_NOT_FOUND;
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| 101 | }
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| 102 |
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| 103 | if (Volume->FatType == Fat32 && (SectorsPerFat == 0 || BpbEx.FsVersion != 0)) {
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| 104 | return EFI_NOT_FOUND;
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| 105 | }
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| 106 |
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| 107 | if (Bpb.Media != 0xf0 &&
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| 108 | Bpb.Media != 0xf8 &&
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| 109 | Bpb.Media != 0xf9 &&
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| 110 | Bpb.Media != 0xfb &&
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| 111 | Bpb.Media != 0xfc &&
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| 112 | Bpb.Media != 0xfd &&
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| 113 | Bpb.Media != 0xfe &&
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| 114 | Bpb.Media != 0xff &&
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| 115 | //
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| 116 | // FujitsuFMR
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| 117 | //
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| 118 | Bpb.Media != 0x00 &&
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| 119 | Bpb.Media != 0x01 &&
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| 120 | Bpb.Media != 0xfa
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| 121 | ) {
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| 122 | return EFI_NOT_FOUND;
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| 123 | }
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| 124 |
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| 125 | if (Volume->FatType != Fat32 && Bpb.RootEntries == 0) {
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| 126 | return EFI_NOT_FOUND;
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| 127 | }
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| 128 | //
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| 129 | // If this is fat32, refuse to mount mirror-disabled volumes
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| 130 | //
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| 131 | if (Volume->FatType == Fat32 && ((BpbEx.ExtendedFlags & 0x80) != 0)) {
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| 132 | return EFI_NOT_FOUND;
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| 133 | }
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| 134 | //
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| 135 | // Fill in the volume structure fields
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| 136 | // (Sectors & SectorsPerFat is computed earlier already)
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| 137 | //
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| 138 | Volume->ClusterSize = Bpb.SectorSize * Bpb.SectorsPerCluster;
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| 139 | Volume->RootEntries = Bpb.RootEntries;
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| 140 | Volume->SectorSize = Bpb.SectorSize;
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| 141 |
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| 142 | RootDirSectors = ((Volume->RootEntries * sizeof (FAT_DIRECTORY_ENTRY)) + (Volume->SectorSize - 1)) / Volume->SectorSize;
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| 143 |
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| 144 | FatLba = Bpb.ReservedSectors;
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| 145 | RootLba = Bpb.NoFats * SectorsPerFat + FatLba;
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| 146 | FirstClusterLba = RootLba + RootDirSectors;
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| 147 |
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| 148 | Volume->VolumeSize = MultU64x32 (Sectors, Volume->SectorSize);
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| 149 | Volume->FatPos = MultU64x32 (FatLba, Volume->SectorSize);
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| 150 | Volume->RootDirPos = MultU64x32 (RootLba, Volume->SectorSize);
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| 151 | Volume->FirstClusterPos = MultU64x32 (FirstClusterLba, Volume->SectorSize);
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| 152 | Volume->MaxCluster = (UINT32) (Sectors - FirstClusterLba) / Bpb.SectorsPerCluster;
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| 153 | Volume->RootDirCluster = BpbEx.RootDirFirstCluster;
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| 154 |
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| 155 | //
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| 156 | // If this is not a fat32, determine if it's a fat16 or fat12
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| 157 | //
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| 158 | if (Volume->FatType != Fat32) {
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| 159 |
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| 160 | if (Volume->MaxCluster >= 65525) {
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| 161 | return EFI_NOT_FOUND;
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| 162 | }
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| 163 |
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| 164 | Volume->FatType = Volume->MaxCluster < 4085 ? Fat12 : Fat16;
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| 165 | }
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| 166 |
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| 167 | return EFI_SUCCESS;
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| 168 | }
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| 169 |
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| 170 |
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| 171 | /**
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| 172 | Gets the next cluster in the cluster chain
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| 173 |
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| 174 | @param PrivateData Global memory map for accessing global variables
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| 175 | @param Volume The volume
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| 176 | @param Cluster The cluster
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| 177 | @param NextCluster The cluster number of the next cluster
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| 178 |
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| 179 | @retval EFI_SUCCESS The address is got
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| 180 | @retval EFI_INVALID_PARAMETER ClusterNo exceeds the MaxCluster of the volume.
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| 181 | @retval EFI_DEVICE_ERROR Read disk error
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| 182 |
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| 183 | **/
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| 184 | EFI_STATUS
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| 185 | FatGetNextCluster (
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| 186 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 187 | IN PEI_FAT_VOLUME *Volume,
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| 188 | IN UINT32 Cluster,
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| 189 | OUT UINT32 *NextCluster
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| 190 | )
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| 191 | {
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| 192 | EFI_STATUS Status;
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| 193 | UINT64 FatEntryPos;
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| 194 | UINT32 Dummy;
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| 195 |
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| 196 | *NextCluster = 0;
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| 197 |
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| 198 | if (Volume->FatType == Fat32) {
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| 199 | FatEntryPos = Volume->FatPos + MultU64x32 (4, Cluster);
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| 200 |
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| 201 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 4, NextCluster);
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| 202 | *NextCluster &= 0x0fffffff;
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| 203 |
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| 204 | //
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| 205 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 206 | //
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| 207 | if ((*NextCluster) >= 0x0ffffff7) {
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| 208 | *NextCluster |= (-1 &~0xf);
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| 209 | }
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| 210 |
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| 211 | } else if (Volume->FatType == Fat16) {
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| 212 | FatEntryPos = Volume->FatPos + MultU64x32 (2, Cluster);
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| 213 |
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| 214 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 2, NextCluster);
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| 215 |
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| 216 | //
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| 217 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 218 | //
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| 219 | if ((*NextCluster) >= 0xfff7) {
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| 220 | *NextCluster |= (-1 &~0xf);
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| 221 | }
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| 222 |
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| 223 | } else {
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| 224 | FatEntryPos = Volume->FatPos + DivU64x32Remainder (MultU64x32 (3, Cluster), 2, &Dummy);
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| 225 |
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| 226 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 2, NextCluster);
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| 227 |
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| 228 | if ((Cluster & 0x01) != 0) {
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| 229 | *NextCluster = (*NextCluster) >> 4;
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| 230 | } else {
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| 231 | *NextCluster = (*NextCluster) & 0x0fff;
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| 232 | }
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| 233 | //
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| 234 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 235 | //
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| 236 | if ((*NextCluster) >= 0x0ff7) {
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| 237 | *NextCluster |= (-1 &~0xf);
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| 238 | }
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| 239 | }
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| 240 |
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| 241 | if (EFI_ERROR (Status)) {
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| 242 | return EFI_DEVICE_ERROR;
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| 243 | }
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| 244 |
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| 245 | return EFI_SUCCESS;
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| 246 |
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| 247 | }
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| 248 |
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| 249 |
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| 250 | /**
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| 251 | Set a file's CurrentPos and CurrentCluster, then compute StraightReadAmount.
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| 252 |
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| 253 | @param PrivateData the global memory map
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| 254 | @param File the file
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| 255 | @param Pos the Position which is offset from the file's
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| 256 | CurrentPos
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| 257 |
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| 258 | @retval EFI_SUCCESS Success.
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| 259 | @retval EFI_INVALID_PARAMETER Pos is beyond file's size.
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| 260 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 261 |
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| 262 | **/
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| 263 | EFI_STATUS
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| 264 | FatSetFilePos (
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| 265 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 266 | IN PEI_FAT_FILE *File,
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| 267 | IN UINT32 Pos
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| 268 | )
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| 269 | {
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| 270 | EFI_STATUS Status;
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| 271 | UINT32 AlignedPos;
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| 272 | UINT32 Offset;
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| 273 | UINT32 Cluster;
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| 274 | UINT32 PrevCluster;
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| 275 |
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| 276 | if (File->IsFixedRootDir) {
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| 277 |
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| 278 | if (Pos >= MultU64x32 (File->Volume->RootEntries, 32) - File->CurrentPos) {
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| 279 | return EFI_INVALID_PARAMETER;
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| 280 | }
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| 281 |
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| 282 | File->CurrentPos += Pos;
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| 283 | File->StraightReadAmount = (UINT32) (MultU64x32 (File->Volume->RootEntries, 32) - File->CurrentPos);
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| 284 |
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| 285 | } else {
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| 286 |
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| 287 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 288 | AlignedPos = (UINT32) File->CurrentPos - (UINT32) Offset;
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| 289 |
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| 290 | while
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| 291 | (
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| 292 | !FAT_CLUSTER_FUNCTIONAL (File->CurrentCluster) &&
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| 293 | AlignedPos + File->Volume->ClusterSize <= File->CurrentPos + Pos
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| 294 | ) {
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| 295 | AlignedPos += File->Volume->ClusterSize;
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| 296 | Status = FatGetNextCluster (
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| 297 | PrivateData,
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| 298 | File->Volume,
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| 299 | File->CurrentCluster,
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| 300 | &File->CurrentCluster
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| 301 | );
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| 302 | if (EFI_ERROR (Status)) {
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| 303 | return EFI_DEVICE_ERROR;
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| 304 | }
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| 305 | }
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| 306 |
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| 307 | if (FAT_CLUSTER_FUNCTIONAL (File->CurrentCluster)) {
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| 308 | return EFI_INVALID_PARAMETER;
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| 309 | }
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| 310 |
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| 311 | File->CurrentPos += Pos;
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| 312 | //
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| 313 | // Calculate the amount of consecutive cluster occupied by the file.
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| 314 | // FatReadFile() will use it to read these blocks once.
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| 315 | //
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| 316 | File->StraightReadAmount = 0;
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| 317 | Cluster = File->CurrentCluster;
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| 318 | while (!FAT_CLUSTER_FUNCTIONAL (Cluster)) {
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| 319 | File->StraightReadAmount += File->Volume->ClusterSize;
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| 320 | PrevCluster = Cluster;
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| 321 | Status = FatGetNextCluster (PrivateData, File->Volume, Cluster, &Cluster);
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| 322 | if (EFI_ERROR (Status)) {
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| 323 | return EFI_DEVICE_ERROR;
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| 324 | }
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| 325 |
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| 326 | if (Cluster != PrevCluster + 1) {
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| 327 | break;
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| 328 | }
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| 329 | }
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| 330 |
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| 331 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 332 | File->StraightReadAmount -= (UINT32) Offset;
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| 333 |
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| 334 | }
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| 335 |
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| 336 | return EFI_SUCCESS;
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| 337 | }
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| 338 |
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| 339 |
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| 340 | /**
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| 341 | Reads file data. Updates the file's CurrentPos.
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| 342 |
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| 343 | @param PrivateData Global memory map for accessing global variables
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| 344 | @param File The file.
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| 345 | @param Size The amount of data to read.
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| 346 | @param Buffer The buffer storing the data.
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| 347 |
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| 348 | @retval EFI_SUCCESS The data is read.
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| 349 | @retval EFI_INVALID_PARAMETER File is invalid.
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| 350 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 351 |
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| 352 | **/
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| 353 | EFI_STATUS
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| 354 | FatReadFile (
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| 355 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 356 | IN PEI_FAT_FILE *File,
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| 357 | IN UINTN Size,
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| 358 | OUT VOID *Buffer
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| 359 | )
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| 360 | {
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| 361 | EFI_STATUS Status;
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| 362 | CHAR8 *BufferPtr;
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| 363 | UINT32 Offset;
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| 364 | UINT64 PhysicalAddr;
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| 365 | UINTN Amount;
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| 366 |
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| 367 | BufferPtr = Buffer;
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| 368 |
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| 369 | if (File->IsFixedRootDir) {
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| 370 | //
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| 371 | // This is the fixed root dir in FAT12 and FAT16
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| 372 | //
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| 373 | if (File->CurrentPos + Size > File->Volume->RootEntries * sizeof (FAT_DIRECTORY_ENTRY)) {
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| 374 | return EFI_INVALID_PARAMETER;
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| 375 | }
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| 376 |
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| 377 | Status = FatReadDisk (
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| 378 | PrivateData,
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| 379 | File->Volume->BlockDeviceNo,
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| 380 | File->Volume->RootDirPos + File->CurrentPos,
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| 381 | Size,
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| 382 | Buffer
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| 383 | );
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| 384 | File->CurrentPos += (UINT32) Size;
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| 385 | return Status;
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| 386 |
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| 387 | } else {
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| 388 |
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| 389 | if ((File->Attributes & FAT_ATTR_DIRECTORY) == 0) {
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| 390 | Size = Size < (File->FileSize - File->CurrentPos) ? Size : (File->FileSize - File->CurrentPos);
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| 391 | }
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| 392 | //
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| 393 | // This is a normal cluster based file
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| 394 | //
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| 395 | while (Size != 0) {
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| 396 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 397 | PhysicalAddr = File->Volume->FirstClusterPos + MultU64x32 (File->Volume->ClusterSize, File->CurrentCluster - 2);
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| 398 |
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| 399 | Amount = File->StraightReadAmount;
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| 400 | Amount = Size > Amount ? Amount : Size;
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| 401 | Status = FatReadDisk (
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| 402 | PrivateData,
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| 403 | File->Volume->BlockDeviceNo,
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| 404 | PhysicalAddr + Offset,
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| 405 | Amount,
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| 406 | BufferPtr
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| 407 | );
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| 408 | if (EFI_ERROR (Status)) {
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| 409 | return EFI_DEVICE_ERROR;
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| 410 | }
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| 411 | //
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| 412 | // Advance the file's current pos and current cluster
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| 413 | //
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| 414 | FatSetFilePos (PrivateData, File, (UINT32) Amount);
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| 415 |
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| 416 | BufferPtr += Amount;
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| 417 | Size -= Amount;
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| 418 | }
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| 419 |
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| 420 | return EFI_SUCCESS;
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| 421 | }
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| 422 | }
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| 423 |
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| 424 |
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| 425 | /**
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| 426 | This function reads the next item in the parent directory and
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| 427 | initializes the output parameter SubFile (CurrentPos is initialized to 0).
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| 428 | The function updates the CurrentPos of the parent dir to after the item read.
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| 429 | If no more items were found, the function returns EFI_NOT_FOUND.
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| 430 |
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| 431 | @param PrivateData Global memory map for accessing global variables
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| 432 | @param ParentDir The parent directory.
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| 433 | @param SubFile The File structure containing the sub file that
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| 434 | is caught.
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| 435 |
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| 436 | @retval EFI_SUCCESS The next sub file is obtained.
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| 437 | @retval EFI_INVALID_PARAMETER The ParentDir is not a directory.
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| 438 | @retval EFI_NOT_FOUND No more sub file exists.
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| 439 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 440 |
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| 441 | **/
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| 442 | EFI_STATUS
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| 443 | FatReadNextDirectoryEntry (
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| 444 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 445 | IN PEI_FAT_FILE *ParentDir,
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| 446 | OUT PEI_FAT_FILE *SubFile
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| 447 | )
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| 448 | {
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| 449 | EFI_STATUS Status;
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| 450 | FAT_DIRECTORY_ENTRY DirEntry;
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| 451 | CHAR16 *Pos;
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| 452 | CHAR16 BaseName[9];
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| 453 | CHAR16 Ext[4];
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| 454 |
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| 455 | ZeroMem ((UINT8 *) SubFile, sizeof (PEI_FAT_FILE));
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| 456 |
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| 457 | //
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| 458 | // Pick a valid directory entry
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|---|
| 459 | //
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|---|
| 460 | while (1) {
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|---|
| 461 | //
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|---|
| 462 | // Read one entry
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|---|
| 463 | //
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|---|
| 464 | Status = FatReadFile (PrivateData, ParentDir, 32, &DirEntry);
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|---|
| 465 | if (EFI_ERROR (Status)) {
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|---|
| 466 | return EFI_DEVICE_ERROR;
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|---|
| 467 | }
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|---|
| 468 | //
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|---|
| 469 | // We only search for *FILE* in root directory
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|---|
| 470 | // Long file name entry is *NOT* supported
|
|---|
| 471 | //
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|---|
| 472 | if (((DirEntry.Attributes & FAT_ATTR_DIRECTORY) == FAT_ATTR_DIRECTORY) || (DirEntry.Attributes == FAT_ATTR_LFN)) {
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|---|
| 473 | continue;
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|---|
| 474 | }
|
|---|
| 475 | //
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|---|
| 476 | // if this is a terminator dir entry, just return EFI_NOT_FOUND
|
|---|
| 477 | //
|
|---|
| 478 | if (DirEntry.FileName[0] == EMPTY_ENTRY_MARK) {
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|---|
| 479 | return EFI_NOT_FOUND;
|
|---|
| 480 | }
|
|---|
| 481 | //
|
|---|
| 482 | // If this not an invalid entry neither an empty entry, this is what we want.
|
|---|
| 483 | // otherwise we will start a new loop to continue to find something meaningful
|
|---|
| 484 | //
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|---|
| 485 | if ((UINT8) DirEntry.FileName[0] != DELETE_ENTRY_MARK) {
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|---|
| 486 | break;
|
|---|
| 487 | }
|
|---|
| 488 | }
|
|---|
| 489 | //
|
|---|
| 490 | // fill in the output parameter
|
|---|
| 491 | //
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|---|
| 492 | EngFatToStr (8, DirEntry.FileName, BaseName);
|
|---|
| 493 | EngFatToStr (3, DirEntry.FileName + 8, Ext);
|
|---|
| 494 |
|
|---|
| 495 | Pos = (UINT16 *) SubFile->FileName;
|
|---|
| 496 | SetMem ((UINT8 *) Pos, FAT_MAX_FILE_NAME_LENGTH, 0);
|
|---|
| 497 | CopyMem ((UINT8 *) Pos, (UINT8 *) BaseName, 2 * (StrLen (BaseName) + 1));
|
|---|
| 498 |
|
|---|
| 499 | if (Ext[0] != 0) {
|
|---|
| 500 | Pos += StrLen (BaseName);
|
|---|
| 501 | *Pos = '.';
|
|---|
| 502 | Pos++;
|
|---|
| 503 | CopyMem ((UINT8 *) Pos, (UINT8 *) Ext, 2 * (StrLen (Ext) + 1));
|
|---|
| 504 | }
|
|---|
| 505 |
|
|---|
| 506 | SubFile->Attributes = DirEntry.Attributes;
|
|---|
| 507 | SubFile->CurrentCluster = DirEntry.FileCluster;
|
|---|
| 508 | if (ParentDir->Volume->FatType == Fat32) {
|
|---|
| 509 | SubFile->CurrentCluster |= DirEntry.FileClusterHigh << 16;
|
|---|
| 510 | }
|
|---|
| 511 |
|
|---|
| 512 | SubFile->CurrentPos = 0;
|
|---|
| 513 | SubFile->FileSize = DirEntry.FileSize;
|
|---|
| 514 | SubFile->StartingCluster = SubFile->CurrentCluster;
|
|---|
| 515 | SubFile->Volume = ParentDir->Volume;
|
|---|
| 516 |
|
|---|
| 517 | //
|
|---|
| 518 | // in Pei phase, time parameters do not need to be filled for minimum use.
|
|---|
| 519 | //
|
|---|
| 520 | return Status;
|
|---|
| 521 | }
|
|---|
