reactos/boot/environ/lib/io/fat.c

   1 /*
   2  * COPYRIGHT:       See COPYING.ARM in the top level directory
   3  * PROJECT:         ReactOS UEFI Boot Library
   4  * FILE:            boot/environ/lib/io/fat.c
   5  * PURPOSE:         Boot Library FAT File System Management Routines
   6  * PROGRAMMER:      Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <bl.h>
  12 #include <fs_rec/fs_rec.h>
  13
  14 /* DATA VARIABLES ************************************************************/
  15
  16 PVOID* FatDeviceTable;
  17 ULONG FatDeviceTableEntries;
  18 PWCHAR FatpLongFileName;
  19
  20 /* FUNCTIONS *****************************************************************/
  21
  22 NTSTATUS
  23 FatMount (
  24     _In_ ULONG DeviceId,
  25     _In_ ULONG Unknown,
  26     _Out_ PBL_FILE_ENTRY* FileEntry
  27     )
  28 {
  29     BL_DEVICE_INFORMATION DeviceInformation;
  30     ULONG UnknownFlag;
  31     NTSTATUS Status;
  32     PACKED_BOOT_SECTOR FatBootSector;
  33     BIOS_PARAMETER_BLOCK BiosBlock;
  34
  35     /* Capture thing */
  36     BlDeviceGetInformation(DeviceId, &DeviceInformation);
  37     UnknownFlag = DeviceInformation.BlockDeviceInfo.Unknown;
  38
  39     /* Set thing to 1 */
  40     DeviceInformation.BlockDeviceInfo.Unknown |= 1;
  41     BlDeviceSetInformation(DeviceId, &DeviceInformation);
  42
  43     /* Read the boot sector */
  44     Status = BlDeviceReadAtOffset(DeviceId,
  45                                   sizeof(FatBootSector),
  46                                   0,
  47                                   &FatBootSector,
  48                                   NULL);
  49
  50     /* Restore thing back */
  51     DeviceInformation.BlockDeviceInfo.Unknown = UnknownFlag;
  52     BlDeviceSetInformation(DeviceId, &DeviceInformation);
  53     if (!NT_SUCCESS(Status))
  54     {
  55         EfiPrintf(L"Failed reading drive: %lx\r\n", Status);
  56         return Status;
  57     }
  58
  59     FatUnpackBios(&BiosBlock, &FatBootSector.PackedBpb);
  60
  61     /* For now, quickly fail if this isn't FAT */
  62     if (FatBootSector.Jump[0] != 0xE9)
  63     {
  64         return STATUS_UNSUCCESSFUL;
  65     }
  66
  67     EfiPrintf(L"Jump: %lx Bytes Per Sector: %d Sectors Per Cluster: %d Reserved: %d Fats: %d Sectors: %d Large Sectors: %d Media: %lx RootEntries: %d\r\n",
  68               FatBootSector.Jump[0],
  69               BiosBlock.BytesPerSector,
  70               BiosBlock.SectorsPerCluster,
  71               BiosBlock.ReservedSectors,
  72               BiosBlock.Fats,
  73               BiosBlock.Sectors,
  74               BiosBlock.LargeSectors,
  75               BiosBlock.Media,
  76               BiosBlock.RootEntries);
  77     return STATUS_NOT_IMPLEMENTED;
  78 }
  79
  80 NTSTATUS
  81 FatInitialize (
  82     VOID
  83     )
  84 {
  85     NTSTATUS Status;
  86
  87     /* Allocate the device table with 2 entries*/
  88     FatDeviceTableEntries = 2;
  89     FatDeviceTable = BlMmAllocateHeap(sizeof(PBL_FILE_ENTRY) *
  90                                       FatDeviceTableEntries);
  91     if (FatDeviceTable)
  92     {
  93         /* Zero it out */
  94         RtlZeroMemory(FatDeviceTable,
  95                       sizeof(PBL_FILE_ENTRY) * FatDeviceTableEntries);
  96
  97         /* Allocate a 512 byte buffer for long file name conversion */
  98         FatpLongFileName = BlMmAllocateHeap(512);
  99         Status = FatpLongFileName != NULL ? STATUS_SUCCESS : STATUS_NO_MEMORY;
 100     }
 101     else
 102     {
 103         /* No memory, fail */
 104         Status = STATUS_NO_MEMORY;
 105     }
 106
 107     /* Return back to caller */
 108     return Status;
 109 }
 110