| 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 - 2017, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | This program and the accompanying materials are licensed and made available
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| 7 | under the terms and conditions of the BSD License which accompanies this
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| 8 | distribution. The full text of the license may be found at
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| 9 | http://opensource.org/licenses/bsd-license.php
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| 10 |
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| 11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 13 |
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| 14 | **/
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| 15 |
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| 16 | #include "FatLitePeim.h"
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| 17 |
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| 18 |
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| 19 | /**
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| 20 | Check if there is a valid FAT in the corresponding Block device
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| 21 | of the volume and if yes, fill in the relevant fields for the
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| 22 | volume structure. Note there should be a valid Block device number
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| 23 | already set.
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| 24 |
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| 25 | @param PrivateData Global memory map for accessing global
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| 26 | variables.
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| 27 | @param Volume On input, the BlockDeviceNumber field of the
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| 28 | Volume should be a valid value. On successful
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| 29 | output, all fields except the VolumeNumber
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| 30 | field is initialized.
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| 31 |
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| 32 | @retval EFI_SUCCESS A FAT is found and the volume structure is
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| 33 | initialized.
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| 34 | @retval EFI_NOT_FOUND There is no FAT on the corresponding device.
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| 35 | @retval EFI_DEVICE_ERROR There is something error while accessing device.
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| 36 |
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| 37 | **/
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| 38 | EFI_STATUS
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| 39 | FatGetBpbInfo (
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| 40 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 41 | IN OUT PEI_FAT_VOLUME *Volume
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| 42 | )
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| 43 | {
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| 44 | EFI_STATUS Status;
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| 45 | PEI_FAT_BOOT_SECTOR Bpb;
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| 46 | PEI_FAT_BOOT_SECTOR_EX BpbEx;
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| 47 | UINT32 Sectors;
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| 48 | UINT32 SectorsPerFat;
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| 49 | UINT32 RootDirSectors;
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| 50 | UINT64 FatLba;
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| 51 | UINT64 RootLba;
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| 52 | UINT64 FirstClusterLba;
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| 53 |
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| 54 | //
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| 55 | // Read in the BPB
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| 56 | //
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| 57 | Status = FatReadDisk (
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| 58 | PrivateData,
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| 59 | Volume->BlockDeviceNo,
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| 60 | 0,
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| 61 | sizeof (PEI_FAT_BOOT_SECTOR_EX),
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| 62 | &BpbEx
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| 63 | );
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| 64 | if (EFI_ERROR (Status)) {
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| 65 | return Status;
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| 66 | }
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| 67 |
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| 68 | CopyMem (
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| 69 | (UINT8 *) (&Bpb),
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| 70 | (UINT8 *) (&BpbEx),
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| 71 | sizeof (PEI_FAT_BOOT_SECTOR)
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| 72 | );
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| 73 |
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| 74 | Volume->FatType = FatUnknown;
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| 75 |
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| 76 | Sectors = Bpb.Sectors;
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| 77 | if (Sectors == 0) {
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| 78 | Sectors = Bpb.LargeSectors;
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| 79 | }
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| 80 |
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| 81 | SectorsPerFat = Bpb.SectorsPerFat;
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| 82 | if (SectorsPerFat == 0) {
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| 83 | SectorsPerFat = BpbEx.LargeSectorsPerFat;
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| 84 | Volume->FatType = Fat32;
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| 85 | }
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| 86 | //
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| 87 | // Filter out those not a FAT
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| 88 | //
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| 89 | if (Bpb.Ia32Jump[0] != 0xe9 && Bpb.Ia32Jump[0] != 0xeb && Bpb.Ia32Jump[0] != 0x49) {
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| 90 | return EFI_NOT_FOUND;
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| 91 | }
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| 92 |
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| 93 | if (Bpb.ReservedSectors == 0 || Bpb.NoFats == 0 || Sectors == 0) {
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| 94 | return EFI_NOT_FOUND;
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| 95 | }
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| 96 |
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| 97 | if (Bpb.SectorsPerCluster != 1 &&
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| 98 | Bpb.SectorsPerCluster != 2 &&
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| 99 | Bpb.SectorsPerCluster != 4 &&
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| 100 | Bpb.SectorsPerCluster != 8 &&
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| 101 | Bpb.SectorsPerCluster != 16 &&
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| 102 | Bpb.SectorsPerCluster != 32 &&
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| 103 | Bpb.SectorsPerCluster != 64 &&
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| 104 | Bpb.SectorsPerCluster != 128
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| 105 | ) {
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| 106 | return EFI_NOT_FOUND;
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| 107 | }
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| 108 |
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| 109 | if (Volume->FatType == Fat32 && (SectorsPerFat == 0 || BpbEx.FsVersion != 0)) {
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| 110 | return EFI_NOT_FOUND;
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| 111 | }
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| 112 |
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| 113 | if (Bpb.Media != 0xf0 &&
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| 114 | Bpb.Media != 0xf8 &&
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| 115 | Bpb.Media != 0xf9 &&
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| 116 | Bpb.Media != 0xfb &&
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| 117 | Bpb.Media != 0xfc &&
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| 118 | Bpb.Media != 0xfd &&
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| 119 | Bpb.Media != 0xfe &&
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| 120 | Bpb.Media != 0xff &&
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| 121 | //
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| 122 | // FujitsuFMR
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| 123 | //
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| 124 | Bpb.Media != 0x00 &&
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| 125 | Bpb.Media != 0x01 &&
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| 126 | Bpb.Media != 0xfa
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| 127 | ) {
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| 128 | return EFI_NOT_FOUND;
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| 129 | }
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| 130 |
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| 131 | if (Volume->FatType != Fat32 && Bpb.RootEntries == 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 | // If this is fat32, refuse to mount mirror-disabled volumes
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| 136 | //
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| 137 | if (Volume->FatType == Fat32 && ((BpbEx.ExtendedFlags & 0x80) != 0)) {
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| 138 | return EFI_NOT_FOUND;
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| 139 | }
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| 140 | //
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| 141 | // Fill in the volume structure fields
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| 142 | // (Sectors & SectorsPerFat is computed earlier already)
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| 143 | //
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| 144 | Volume->ClusterSize = Bpb.SectorSize * Bpb.SectorsPerCluster;
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| 145 | Volume->RootEntries = Bpb.RootEntries;
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| 146 | Volume->SectorSize = Bpb.SectorSize;
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| 147 |
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| 148 | RootDirSectors = ((Volume->RootEntries * sizeof (FAT_DIRECTORY_ENTRY)) + (Volume->SectorSize - 1)) / Volume->SectorSize;
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| 149 |
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| 150 | FatLba = Bpb.ReservedSectors;
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| 151 | RootLba = Bpb.NoFats * SectorsPerFat + FatLba;
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| 152 | FirstClusterLba = RootLba + RootDirSectors;
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| 153 |
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| 154 | Volume->VolumeSize = MultU64x32 (Sectors, Volume->SectorSize);
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| 155 | Volume->FatPos = MultU64x32 (FatLba, Volume->SectorSize);
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| 156 | Volume->RootDirPos = MultU64x32 (RootLba, Volume->SectorSize);
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| 157 | Volume->FirstClusterPos = MultU64x32 (FirstClusterLba, Volume->SectorSize);
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| 158 | Volume->MaxCluster = (UINT32) (Sectors - FirstClusterLba) / Bpb.SectorsPerCluster;
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| 159 | Volume->RootDirCluster = BpbEx.RootDirFirstCluster;
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| 160 |
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| 161 | //
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| 162 | // If this is not a fat32, determine if it's a fat16 or fat12
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| 163 | //
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| 164 | if (Volume->FatType != Fat32) {
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| 165 |
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| 166 | if (Volume->MaxCluster >= 65525) {
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| 167 | return EFI_NOT_FOUND;
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| 168 | }
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| 169 |
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| 170 | Volume->FatType = Volume->MaxCluster < 4085 ? Fat12 : Fat16;
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| 171 | }
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| 172 |
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| 173 | return EFI_SUCCESS;
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| 174 | }
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| 175 |
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| 176 |
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| 177 | /**
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| 178 | Gets the next cluster in the cluster chain
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| 179 |
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| 180 | @param PrivateData Global memory map for accessing global variables
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| 181 | @param Volume The volume
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| 182 | @param Cluster The cluster
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| 183 | @param NextCluster The cluster number of the next cluster
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| 184 |
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| 185 | @retval EFI_SUCCESS The address is got
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| 186 | @retval EFI_INVALID_PARAMETER ClusterNo exceeds the MaxCluster of the volume.
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| 187 | @retval EFI_DEVICE_ERROR Read disk error
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| 188 |
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| 189 | **/
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| 190 | EFI_STATUS
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| 191 | FatGetNextCluster (
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| 192 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 193 | IN PEI_FAT_VOLUME *Volume,
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| 194 | IN UINT32 Cluster,
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| 195 | OUT UINT32 *NextCluster
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| 196 | )
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| 197 | {
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| 198 | EFI_STATUS Status;
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| 199 | UINT64 FatEntryPos;
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| 200 | UINT32 Dummy;
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| 201 |
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| 202 | *NextCluster = 0;
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| 203 |
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| 204 | if (Volume->FatType == Fat32) {
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| 205 | FatEntryPos = Volume->FatPos + MultU64x32 (4, Cluster);
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| 206 |
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| 207 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 4, NextCluster);
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| 208 | *NextCluster &= 0x0fffffff;
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| 209 |
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| 210 | //
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| 211 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 212 | //
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| 213 | if ((*NextCluster) >= 0x0ffffff7) {
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| 214 | *NextCluster |= (-1 &~0xf);
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| 215 | }
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| 216 |
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| 217 | } else if (Volume->FatType == Fat16) {
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| 218 | FatEntryPos = Volume->FatPos + MultU64x32 (2, Cluster);
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| 219 |
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| 220 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 2, NextCluster);
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| 221 |
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| 222 | //
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| 223 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 224 | //
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| 225 | if ((*NextCluster) >= 0xfff7) {
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| 226 | *NextCluster |= (-1 &~0xf);
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| 227 | }
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| 228 |
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| 229 | } else {
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| 230 | FatEntryPos = Volume->FatPos + DivU64x32Remainder (MultU64x32 (3, Cluster), 2, &Dummy);
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| 231 |
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| 232 | Status = FatReadDisk (PrivateData, Volume->BlockDeviceNo, FatEntryPos, 2, NextCluster);
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| 233 |
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| 234 | if ((Cluster & 0x01) != 0) {
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| 235 | *NextCluster = (*NextCluster) >> 4;
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| 236 | } else {
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| 237 | *NextCluster = (*NextCluster) & 0x0fff;
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| 238 | }
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| 239 | //
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| 240 | // Pad high bits for our FAT_CLUSTER_... macro definitions to work
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| 241 | //
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| 242 | if ((*NextCluster) >= 0x0ff7) {
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| 243 | *NextCluster |= (-1 &~0xf);
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | if (EFI_ERROR (Status)) {
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| 248 | return EFI_DEVICE_ERROR;
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| 249 | }
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| 250 |
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| 251 | return EFI_SUCCESS;
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| 252 |
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| 253 | }
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| 254 |
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| 255 |
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| 256 | /**
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| 257 | Set a file's CurrentPos and CurrentCluster, then compute StraightReadAmount.
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| 258 |
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| 259 | @param PrivateData the global memory map
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| 260 | @param File the file
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| 261 | @param Pos the Position which is offset from the file's
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| 262 | CurrentPos
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| 263 |
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| 264 | @retval EFI_SUCCESS Success.
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| 265 | @retval EFI_INVALID_PARAMETER Pos is beyond file's size.
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| 266 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 267 |
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| 268 | **/
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| 269 | EFI_STATUS
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| 270 | FatSetFilePos (
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| 271 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 272 | IN PEI_FAT_FILE *File,
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| 273 | IN UINT32 Pos
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| 274 | )
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| 275 | {
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| 276 | EFI_STATUS Status;
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| 277 | UINT32 AlignedPos;
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| 278 | UINT32 Offset;
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| 279 | UINT32 Cluster;
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| 280 | UINT32 PrevCluster;
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| 281 |
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| 282 | if (File->IsFixedRootDir) {
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| 283 |
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| 284 | if (Pos >= MultU64x32 (File->Volume->RootEntries, 32) - File->CurrentPos) {
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| 285 | return EFI_INVALID_PARAMETER;
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| 286 | }
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| 287 |
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| 288 | File->CurrentPos += Pos;
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| 289 | File->StraightReadAmount = (UINT32) (MultU64x32 (File->Volume->RootEntries, 32) - File->CurrentPos);
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| 290 |
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| 291 | } else {
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| 292 |
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| 293 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 294 | AlignedPos = (UINT32) File->CurrentPos - (UINT32) Offset;
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| 295 |
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| 296 | while
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| 297 | (
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| 298 | !FAT_CLUSTER_FUNCTIONAL (File->CurrentCluster) &&
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| 299 | AlignedPos + File->Volume->ClusterSize <= File->CurrentPos + Pos
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| 300 | ) {
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| 301 | AlignedPos += File->Volume->ClusterSize;
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| 302 | Status = FatGetNextCluster (
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| 303 | PrivateData,
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| 304 | File->Volume,
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| 305 | File->CurrentCluster,
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| 306 | &File->CurrentCluster
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| 307 | );
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| 308 | if (EFI_ERROR (Status)) {
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| 309 | return EFI_DEVICE_ERROR;
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| 310 | }
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| 311 | }
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| 312 |
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| 313 | if (FAT_CLUSTER_FUNCTIONAL (File->CurrentCluster)) {
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| 314 | return EFI_INVALID_PARAMETER;
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| 315 | }
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| 316 |
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| 317 | File->CurrentPos += Pos;
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| 318 | //
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| 319 | // Calculate the amount of consecutive cluster occupied by the file.
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| 320 | // FatReadFile() will use it to read these blocks once.
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| 321 | //
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| 322 | File->StraightReadAmount = 0;
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| 323 | Cluster = File->CurrentCluster;
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| 324 | while (!FAT_CLUSTER_FUNCTIONAL (Cluster)) {
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| 325 | File->StraightReadAmount += File->Volume->ClusterSize;
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| 326 | PrevCluster = Cluster;
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| 327 | Status = FatGetNextCluster (PrivateData, File->Volume, Cluster, &Cluster);
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| 328 | if (EFI_ERROR (Status)) {
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| 329 | return EFI_DEVICE_ERROR;
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| 330 | }
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| 331 |
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| 332 | if (Cluster != PrevCluster + 1) {
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| 333 | break;
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| 334 | }
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| 335 | }
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| 336 |
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| 337 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 338 | File->StraightReadAmount -= (UINT32) Offset;
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| 339 |
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| 340 | }
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| 341 |
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| 342 | return EFI_SUCCESS;
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| 343 | }
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| 344 |
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| 345 |
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| 346 | /**
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| 347 | Reads file data. Updates the file's CurrentPos.
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| 348 |
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| 349 | @param PrivateData Global memory map for accessing global variables
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| 350 | @param File The file.
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| 351 | @param Size The amount of data to read.
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| 352 | @param Buffer The buffer storing the data.
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| 353 |
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| 354 | @retval EFI_SUCCESS The data is read.
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| 355 | @retval EFI_INVALID_PARAMETER File is invalid.
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| 356 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 357 |
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| 358 | **/
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| 359 | EFI_STATUS
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| 360 | FatReadFile (
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| 361 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 362 | IN PEI_FAT_FILE *File,
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| 363 | IN UINTN Size,
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| 364 | OUT VOID *Buffer
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| 365 | )
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| 366 | {
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| 367 | EFI_STATUS Status;
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| 368 | CHAR8 *BufferPtr;
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| 369 | UINT32 Offset;
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| 370 | UINT64 PhysicalAddr;
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| 371 | UINTN Amount;
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| 372 |
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| 373 | BufferPtr = Buffer;
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| 374 |
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| 375 | if (File->IsFixedRootDir) {
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| 376 | //
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| 377 | // This is the fixed root dir in FAT12 and FAT16
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| 378 | //
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| 379 | if (File->CurrentPos + Size > File->Volume->RootEntries * sizeof (FAT_DIRECTORY_ENTRY)) {
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| 380 | return EFI_INVALID_PARAMETER;
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| 381 | }
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| 382 |
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| 383 | Status = FatReadDisk (
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| 384 | PrivateData,
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| 385 | File->Volume->BlockDeviceNo,
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| 386 | File->Volume->RootDirPos + File->CurrentPos,
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| 387 | Size,
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| 388 | Buffer
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| 389 | );
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| 390 | File->CurrentPos += (UINT32) Size;
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| 391 | return Status;
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| 392 |
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| 393 | } else {
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| 394 |
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| 395 | if ((File->Attributes & FAT_ATTR_DIRECTORY) == 0) {
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| 396 | Size = Size < (File->FileSize - File->CurrentPos) ? Size : (File->FileSize - File->CurrentPos);
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| 397 | }
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| 398 | //
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| 399 | // This is a normal cluster based file
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| 400 | //
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| 401 | while (Size != 0) {
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| 402 | DivU64x32Remainder (File->CurrentPos, File->Volume->ClusterSize, &Offset);
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| 403 | PhysicalAddr = File->Volume->FirstClusterPos + MultU64x32 (File->Volume->ClusterSize, File->CurrentCluster - 2);
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| 404 |
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| 405 | Amount = File->StraightReadAmount;
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| 406 | Amount = Size > Amount ? Amount : Size;
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| 407 | Status = FatReadDisk (
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| 408 | PrivateData,
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| 409 | File->Volume->BlockDeviceNo,
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| 410 | PhysicalAddr + Offset,
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| 411 | Amount,
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| 412 | BufferPtr
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| 413 | );
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| 414 | if (EFI_ERROR (Status)) {
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| 415 | return EFI_DEVICE_ERROR;
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| 416 | }
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| 417 | //
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| 418 | // Advance the file's current pos and current cluster
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| 419 | //
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| 420 | FatSetFilePos (PrivateData, File, (UINT32) Amount);
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| 421 |
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| 422 | BufferPtr += Amount;
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| 423 | Size -= Amount;
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| 424 | }
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| 425 |
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| 426 | return EFI_SUCCESS;
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| 427 | }
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| 428 | }
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| 429 |
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| 430 |
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| 431 | /**
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| 432 | This function reads the next item in the parent directory and
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| 433 | initializes the output parameter SubFile (CurrentPos is initialized to 0).
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| 434 | The function updates the CurrentPos of the parent dir to after the item read.
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| 435 | If no more items were found, the function returns EFI_NOT_FOUND.
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| 436 |
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| 437 | @param PrivateData Global memory map for accessing global variables
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| 438 | @param ParentDir The parent directory.
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| 439 | @param SubFile The File structure containing the sub file that
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| 440 | is caught.
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| 441 |
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| 442 | @retval EFI_SUCCESS The next sub file is obtained.
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| 443 | @retval EFI_INVALID_PARAMETER The ParentDir is not a directory.
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| 444 | @retval EFI_NOT_FOUND No more sub file exists.
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| 445 | @retval EFI_DEVICE_ERROR Something error while accessing media.
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| 446 |
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| 447 | **/
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| 448 | EFI_STATUS
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| 449 | FatReadNextDirectoryEntry (
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| 450 | IN PEI_FAT_PRIVATE_DATA *PrivateData,
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| 451 | IN PEI_FAT_FILE *ParentDir,
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| 452 | OUT PEI_FAT_FILE *SubFile
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| 453 | )
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| 454 | {
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| 455 | EFI_STATUS Status;
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| 456 | FAT_DIRECTORY_ENTRY DirEntry;
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| 457 | CHAR16 *Pos;
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| 458 | CHAR16 BaseName[9];
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| 459 | CHAR16 Ext[4];
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| 460 |
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| 461 | ZeroMem ((UINT8 *) SubFile, sizeof (PEI_FAT_FILE));
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| 462 |
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| 463 | //
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| 464 | // Pick a valid directory entry
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| 465 | //
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| 466 | while (1) {
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| 467 | //
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| 468 | // Read one entry
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| 469 | //
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| 470 | Status = FatReadFile (PrivateData, ParentDir, 32, &DirEntry);
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| 471 | if (EFI_ERROR (Status)) {
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| 472 | return EFI_DEVICE_ERROR;
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| 473 | }
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| 474 | //
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| 475 | // We only search for *FILE* in root directory
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| 476 | // Long file name entry is *NOT* supported
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| 477 | //
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| 478 | if (((DirEntry.Attributes & FAT_ATTR_DIRECTORY) == FAT_ATTR_DIRECTORY) || (DirEntry.Attributes == FAT_ATTR_LFN)) {
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| 479 | continue;
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| 480 | }
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| 481 | //
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| 482 | // if this is a terminator dir entry, just return EFI_NOT_FOUND
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| 483 | //
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| 484 | if (DirEntry.FileName[0] == EMPTY_ENTRY_MARK) {
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| 485 | return EFI_NOT_FOUND;
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| 486 | }
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| 487 | //
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| 488 | // If this not an invalid entry neither an empty entry, this is what we want.
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| 489 | // otherwise we will start a new loop to continue to find something meaningful
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| 490 | //
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| 491 | if ((UINT8) DirEntry.FileName[0] != DELETE_ENTRY_MARK) {
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| 492 | break;
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| 493 | }
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| 494 | }
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| 495 | //
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| 496 | // fill in the output parameter
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| 497 | //
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| 498 | EngFatToStr (8, DirEntry.FileName, BaseName);
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| 499 | EngFatToStr (3, DirEntry.FileName + 8, Ext);
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| 500 |
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| 501 | Pos = (UINT16 *) SubFile->FileName;
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| 502 | SetMem ((UINT8 *) Pos, FAT_MAX_FILE_NAME_LENGTH, 0);
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| 503 | CopyMem ((UINT8 *) Pos, (UINT8 *) BaseName, 2 * (StrLen (BaseName) + 1));
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| 504 |
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| 505 | if (Ext[0] != 0) {
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| 506 | Pos += StrLen (BaseName);
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| 507 | *Pos = '.';
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| 508 | Pos++;
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| 509 | CopyMem ((UINT8 *) Pos, (UINT8 *) Ext, 2 * (StrLen (Ext) + 1));
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| 510 | }
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| 511 |
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| 512 | SubFile->Attributes = DirEntry.Attributes;
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| 513 | SubFile->CurrentCluster = DirEntry.FileCluster;
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| 514 | if (ParentDir->Volume->FatType == Fat32) {
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| 515 | SubFile->CurrentCluster |= DirEntry.FileClusterHigh << 16;
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| 516 | }
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| 517 |
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| 518 | SubFile->CurrentPos = 0;
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| 519 | SubFile->FileSize = DirEntry.FileSize;
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| 520 | SubFile->StartingCluster = SubFile->CurrentCluster;
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| 521 | SubFile->Volume = ParentDir->Volume;
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| 522 |
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| 523 | //
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| 524 | // in Pei phase, time parameters do not need to be filled for minimum use.
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| 525 | //
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| 526 | return Status;
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| 527 | }
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