/*
* PROJECT: ReactOS Boot Loader
* LICENSE: BSD - See COPYING.ARM in the top level directory
- * FILE: boot/freeldr/arch/i386/ramdisk.c
+ * FILE: boot/freeldr/freeldr/disk/ramdisk.c
* PURPOSE: Implements routines to support booting from a RAM Disk
* PROGRAMMERS: ReactOS Portable Systems Group
+ * Hervé Poussineau
*/
/* INCLUDES *******************************************************************/
PVOID gRamDiskBase;
ULONG gRamDiskSize;
-extern BOOLEAN gCacheEnabled;
+ULONG gRamDiskOffset;
/* FUNCTIONS ******************************************************************/
-FORCEINLINE
-PVOID
-RamDiskGetDataAtOffset(IN PVOID Offset)
+static LONG RamDiskClose(ULONG FileId)
{
//
- // Return data from our RAM Disk
+ // Nothing to do
//
- ASSERT(((ULONG_PTR)gRamDiskBase + (ULONG_PTR)Offset) <
- ((ULONG_PTR)gRamDiskBase + (ULONG_PTR)gRamDiskSize));
- return (PVOID)((ULONG_PTR)gRamDiskBase + (ULONG_PTR)(Offset));
+ return ESUCCESS;
}
-ULONG
-RamDiskGetCacheableBlockCount(IN ULONG Reserved)
+static LONG RamDiskGetFileInformation(ULONG FileId, FILEINFORMATION* Information)
{
//
- // Allow 32KB transfers (64 sectors), emulating BIOS LBA
+ // Give current seek offset and ram disk size to caller
//
- ASSERT(Reserved == 0x49);
- return 64;
+ RtlZeroMemory(Information, sizeof(FILEINFORMATION));
+ Information->EndingAddress.LowPart = gRamDiskSize;
+ Information->CurrentAddress.LowPart = gRamDiskOffset;
+
+ return ESUCCESS;
}
-BOOLEAN
-RamDiskGetDriveGeometry(IN ULONG Reserved,
- OUT PGEOMETRY Geometry)
+static LONG RamDiskOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
{
//
- // Should never be called when the caller expects valid Geometry!
+ // Always return success, as contents are already in memory
//
- ASSERT(Reserved == 0x49);
- return TRUE;
+ return ESUCCESS;
}
-BOOLEAN
-RamDiskReadLogicalSectors(IN ULONG Reserved,
- IN ULONGLONG SectorNumber,
- IN ULONG SectorCount,
- IN PVOID Buffer)
+static LONG RamDiskRead(ULONG FileId, VOID* Buffer, ULONG N, ULONG* Count)
{
PVOID StartAddress;
- ULONG Length;
- ASSERT(Reserved == 0x49);
//
- // Get actual pointers and lengths
+ // Get actual pointer
//
- StartAddress = (PVOID)((ULONG)SectorNumber * 512);
- Length = SectorCount * 512;
-
+ StartAddress = (PVOID)((ULONG_PTR)gRamDiskBase + gRamDiskOffset);
+
//
// Don't allow reads past our image
//
- if (((ULONG_PTR)StartAddress + Length) > gRamDiskSize) return FALSE;
+ if (gRamDiskOffset + N > gRamDiskSize)
+ {
+ *Count = 0;
+ return EIO;
+ }
//
// Do the read
//
- RtlCopyMemory(Buffer, RamDiskGetDataAtOffset(StartAddress), Length);
- return TRUE;
+ RtlCopyMemory(Buffer, StartAddress, N);
+ *Count = N;
+
+ return ESUCCESS;
+}
+
+static LONG RamDiskSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode)
+{
+ //
+ // Only accept absolute mode now
+ //
+ if (SeekMode != SeekAbsolute)
+ return EINVAL;
+
+ //
+ // Check if we're in the ramdisk
+ //
+ if (Position->HighPart != 0)
+ return EINVAL;
+ if (Position->LowPart >= gRamDiskSize)
+ return EINVAL;
+
+ //
+ // OK, remember seek position
+ //
+ gRamDiskOffset = Position->LowPart;
+
+ return ESUCCESS;
+}
+
+static const DEVVTBL RamDiskVtbl = {
+ RamDiskClose,
+ RamDiskGetFileInformation,
+ RamDiskOpen,
+ RamDiskRead,
+ RamDiskSeek,
+};
+
+VOID
+NTAPI
+RamDiskInitialize(VOID)
+{
+ /* Setup the RAMDISK device */
+ FsRegisterDevice("ramdisk(0)", &RamDiskVtbl);
}
VOID
NTAPI
RamDiskLoadVirtualFile(IN PCHAR FileName)
{
- PFILE RamFile;
- ULONG TotalRead, ChunkSize;
- PCHAR MsgBuffer = "Loading ramdisk...";
+ ULONG RamFile;
+ ULONG TotalRead, ChunkSize, Count;
+ PCHAR MsgBuffer = "Loading ramdisk...";
ULONG PercentPerChunk, Percent;
+ FILEINFORMATION Information;
+ LARGE_INTEGER Position;
+ LONG ret;
//
// Display progress
UiDrawProgressBarCenter(1, 100, MsgBuffer);
//
- // Try opening the ramdisk file (this assumes the boot volume was opened)
- //
- RamFile = FsOpenFile(FileName);
- if (RamFile)
+ // Try opening the ramdisk file
+ //
+ ret = ArcOpen(FileName, OpenReadOnly, &RamFile);
+ if (ret == ESUCCESS)
{
//
// Get the file size
//
- gRamDiskSize = FsGetFileSize(RamFile);
- if (!gRamDiskSize) return;
-
+ ret = ArcGetFileInformation(RamFile, &Information);
+ if (ret != ESUCCESS)
+ {
+ ArcClose(RamFile);
+ return;
+ }
+
+ //
+ // For now, limit RAM disks to 4GB
+ //
+ if (Information.EndingAddress.HighPart != 0)
+ {
+ UiMessageBox("RAM disk too big\n");
+ ArcClose(RamFile);
+ return;
+ }
+ gRamDiskSize = Information.EndingAddress.LowPart;
+
//
// Allocate memory for it
//
ChunkSize = 8 * 1024 * 1024;
- Percent = PercentPerChunk = 100 / (gRamDiskSize / ChunkSize);
- gRamDiskBase = MmAllocateMemory(gRamDiskSize);
- if (!gRamDiskBase) return;
-
+ if (gRamDiskSize < ChunkSize)
+ Percent = PercentPerChunk = 0;
+ else
+ Percent = PercentPerChunk = 100 / (gRamDiskSize / ChunkSize);
+ gRamDiskBase = MmAllocateMemoryWithType(gRamDiskSize, LoaderXIPRom);
+ if (!gRamDiskBase)
+ {
+ UiMessageBox("Failed to allocate memory for RAM disk\n");
+ ArcClose(RamFile);
+ return;
+ }
+
//
// Read it in chunks
//
//
// Copy the contents
//
-
- if (!FsReadFile(RamFile,
- ChunkSize,
- NULL,
- (PVOID)((ULONG_PTR)gRamDiskBase + TotalRead)))
+ Position.HighPart = 0;
+ Position.LowPart = TotalRead;
+ ret = ArcSeek(RamFile, &Position, SeekAbsolute);
+ if (ret == ESUCCESS)
{
- //
- // Fail
- //
+ ret = ArcRead(RamFile,
+ (PVOID)((ULONG_PTR)gRamDiskBase + TotalRead),
+ ChunkSize,
+ &Count);
+ }
+
+ //
+ // Check for success
+ //
+ if (ret != ESUCCESS || Count != ChunkSize)
+ {
+ MmFreeMemory(gRamDiskBase);
+ gRamDiskBase = NULL;
+ gRamDiskSize = 0;
+ ArcClose(RamFile);
UiMessageBox("Failed to read ramdisk\n");
+ return;
}
}
- }
-}
-VOID
-NTAPI
-RamDiskSwitchFromBios(VOID)
-{
- extern ULONG BootDrive, BootPartition;
+ ArcClose(RamFile);
- //
- // Check if we have a ramdisk, in which case we need to switch routines
- //
- if (gRamDiskBase)
- {
- //
- // Don't use the BIOS for reads anymore
- //
- MachVtbl.DiskReadLogicalSectors = RamDiskReadLogicalSectors;
- MachVtbl.DiskGetDriveGeometry = RamDiskGetDriveGeometry;
- MachVtbl.DiskGetCacheableBlockCount = RamDiskGetCacheableBlockCount;
-
- //
- // Also disable cached FAT reads
- //
- gCacheEnabled = FALSE;
-
- //
- // Switch to ramdisk boot partition
- //
- BootDrive = 0x49;
- BootPartition = 0;
+ // Register a new device for the ramdisk
+ FsRegisterDevice("ramdisk(0)", &RamDiskVtbl);
}
}
projects / reactos.git / blobdiff