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 "..\drivers\filesystems\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
  34     EfiPrintf(L"FAT Mount on Device %d\r\n", DeviceId);
  35
  36     /* Capture thing */
  37     BlDeviceGetInformation(DeviceId, &DeviceInformation);
  38     UnknownFlag = DeviceInformation.BlockDeviceInfo.Unknown;
  39
  40     /* Set thing to 1 */
  41     DeviceInformation.BlockDeviceInfo.Unknown |= 1;
  42     BlDeviceSetInformation(DeviceId, &DeviceInformation);
  43
  44     /* Read the boot sector */
  45     EfiPrintf(L"Reading fat boot sector...\r\n");
  46     Status = BlDeviceReadAtOffset(DeviceId,
  47                                   sizeof(FatBootSector),
  48                                   0,
  49                                   &FatBootSector,
  50                                   NULL);
  51
  52     /* Restore thing back */
  53     DeviceInformation.BlockDeviceInfo.Unknown = UnknownFlag;
  54     BlDeviceSetInformation(DeviceId, &DeviceInformation);
  55     if (!NT_SUCCESS(Status))
  56     {
  57         EfiPrintf(L"Failed reading drive: %lx\r\n", Status);
  58         return Status;
  59     }
  60
  61     EfiPrintf(L"Drive read\r\n");
  62     EfiStall(3000000);
  63     return STATUS_NOT_IMPLEMENTED;
  64 }
  65
  66 NTSTATUS
  67 FatInitialize (
  68     VOID
  69     )
  70 {
  71     NTSTATUS Status;
  72
  73     /* Allocate the device table with 2 entries*/
  74     FatDeviceTableEntries = 2;
  75     FatDeviceTable = BlMmAllocateHeap(sizeof(PBL_FILE_ENTRY) *
  76                                       FatDeviceTableEntries);
  77     if (FatDeviceTable)
  78     {
  79         /* Zero it out */
  80         RtlZeroMemory(FatDeviceTable,
  81                       sizeof(PBL_FILE_ENTRY) * FatDeviceTableEntries);
  82
  83         /* Allocate a 512 byte buffer for long file name conversion */
  84         FatpLongFileName = BlMmAllocateHeap(512);
  85         Status = FatpLongFileName != NULL ? STATUS_SUCCESS : STATUS_NO_MEMORY;
  86     }
  87     else
  88     {
  89         /* No memory, fail */
  90         Status = STATUS_NO_MEMORY;
  91     }
  92
  93     /* Return back to caller */
  94     return Status;
  95 }
  96