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