mirror of
https://github.com/reactos/reactos.git
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111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/*
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* COPYRIGHT: See COPYING.ARM in the top level directory
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* PROJECT: ReactOS UEFI Boot Library
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* FILE: boot/environ/lib/io/fat.c
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* PURPOSE: Boot Library FAT File System Management Routines
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* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <bl.h>
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#include <fs_rec/fs_rec.h>
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/* DATA VARIABLES ************************************************************/
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PVOID* FatDeviceTable;
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ULONG FatDeviceTableEntries;
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PWCHAR FatpLongFileName;
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/* FUNCTIONS *****************************************************************/
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NTSTATUS
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FatMount (
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_In_ ULONG DeviceId,
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_In_ ULONG Unknown,
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_Out_ PBL_FILE_ENTRY* FileEntry
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)
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{
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BL_DEVICE_INFORMATION DeviceInformation;
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ULONG UnknownFlag;
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NTSTATUS Status;
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PACKED_BOOT_SECTOR FatBootSector;
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BIOS_PARAMETER_BLOCK BiosBlock;
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/* Capture thing */
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BlDeviceGetInformation(DeviceId, &DeviceInformation);
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UnknownFlag = DeviceInformation.BlockDeviceInfo.Unknown;
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/* Set thing to 1 */
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DeviceInformation.BlockDeviceInfo.Unknown |= 1;
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BlDeviceSetInformation(DeviceId, &DeviceInformation);
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/* Read the boot sector */
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Status = BlDeviceReadAtOffset(DeviceId,
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sizeof(FatBootSector),
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0,
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&FatBootSector,
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NULL);
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/* Restore thing back */
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DeviceInformation.BlockDeviceInfo.Unknown = UnknownFlag;
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BlDeviceSetInformation(DeviceId, &DeviceInformation);
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if (!NT_SUCCESS(Status))
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{
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EfiPrintf(L"Failed reading drive: %lx\r\n", Status);
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return Status;
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}
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FatUnpackBios(&BiosBlock, &FatBootSector.PackedBpb);
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/* For now, quickly fail if this isn't FAT */
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if (FatBootSector.Jump[0] != 0xE9)
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{
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return STATUS_UNSUCCESSFUL;
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}
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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",
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FatBootSector.Jump[0],
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BiosBlock.BytesPerSector,
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BiosBlock.SectorsPerCluster,
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BiosBlock.ReservedSectors,
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BiosBlock.Fats,
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BiosBlock.Sectors,
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BiosBlock.LargeSectors,
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BiosBlock.Media,
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BiosBlock.RootEntries);
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return STATUS_NOT_IMPLEMENTED;
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}
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NTSTATUS
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FatInitialize (
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VOID
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)
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{
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NTSTATUS Status;
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/* Allocate the device table with 2 entries*/
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FatDeviceTableEntries = 2;
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FatDeviceTable = BlMmAllocateHeap(sizeof(PBL_FILE_ENTRY) *
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FatDeviceTableEntries);
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if (FatDeviceTable)
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{
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/* Zero it out */
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RtlZeroMemory(FatDeviceTable,
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sizeof(PBL_FILE_ENTRY) * FatDeviceTableEntries);
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/* Allocate a 512 byte buffer for long file name conversion */
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FatpLongFileName = BlMmAllocateHeap(512);
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Status = FatpLongFileName != NULL ? STATUS_SUCCESS : STATUS_NO_MEMORY;
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}
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else
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{
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/* No memory, fail */
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Status = STATUS_NO_MEMORY;
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}
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/* Return back to caller */
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return Status;
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}
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