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- Save base page where loader mapped the ramdisk.

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- Try to implement RamdiskMapPages for boot disks as it seems we're calling them now...
- The math works and the I/O mapping too, but I'm not sure we're reading correct data, so still left this unimplemented for now.


svn path=/trunk/; revision=34659
This commit is contained in:
ReactOS Portable Systems Group 2008-07-22 06:21:11 +00:00
parent 4d7d1dfc95
commit d543929a55
1 changed files with 57 additions and 1 deletions
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58
reactos/drivers/storage/class/ramdisk/ramdisk.c
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@ -94,6 +94,7 @@ typedef struct _RAMDISK_DRIVE_EXTENSION
ULONG BytesPerSector;
ULONG SectorsPerTrack;
ULONG NumberOfHeads;
ULONG BasePage;
} RAMDISK_DRIVE_EXTENSION, *PRAMDISK_DRIVE_EXTENSION;
ULONG MaximumViewLength;
@ -273,7 +274,61 @@ RamdiskMapPages(IN PRAMDISK_DRIVE_EXTENSION DeviceExtension,
IN ULONG Length,
OUT PULONG OutputLength)
{
DPRINT1("Mapping %lx bytes at %I64x\n", Length, Offset.QuadPart);
PHYSICAL_ADDRESS PhysicalAddress;
PVOID MappedBase;
SIZE_T ActualLength;
LARGE_INTEGER ActualOffset;
LARGE_INTEGER ActualPages;
//
// We only support boot disks for now
//
ASSERT(DeviceExtension->DiskType == RAMDISK_BOOT_DISK);
//
// Calculate the actual offset in the drive
//
ActualOffset.QuadPart = DeviceExtension->DiskOffset + Offset.QuadPart;
DPRINT1("Disk offset is: %I64d and Offset is: %I64d. Total: %I64d\n",
DeviceExtension->DiskOffset, Offset, ActualOffset);
//
// Convert to pages
//
ActualOffset.QuadPart = BYTES_TO_PAGES(ActualOffset.QuadPart);
DPRINT1("Offset in pages is: %d\n", ActualOffset);
//
// Now add the base page
//
ActualPages.QuadPart = DeviceExtension->BasePage + ActualOffset.QuadPart;
DPRINT1("Ramdisk mapped at page: %d, actual page is: %I64d\n",
DeviceExtension->BasePage, ActualPages);
//
// Calculate final amount of bytes
//
PhysicalAddress.QuadPart = ActualPages.QuadPart << PAGE_SHIFT;
DPRINT1("Physical Address is: %I64x\n", PhysicalAddress);
//
// Calculate pages spanned for the mapping
//
ActualLength = ADDRESS_AND_SIZE_TO_SPAN_PAGES(Offset.QuadPart, Length);
DPRINT1("Length in pages: %d\n", ActualLength);
//
// And convert this back to bytes
//
ActualLength <<= PAGE_SHIFT;
DPRINT1("Length in bytes: %d\n", ActualLength);
//
// Map the I/O Space from the loader
//
MappedBase = MmMapIoSpace(PhysicalAddress, ActualLength, MmCached);
DPRINT1("Mapped at: %p\n", MappedBase);
UNIMPLEMENTED;
while (TRUE);
return NULL;
@ -532,6 +587,7 @@ RamdiskCreateDiskDevice(IN PRAMDISK_BUS_EXTENSION DeviceExtension,
DriveExtension->DiskOptions = Input->Options;
DriveExtension->DiskLength = Input->DiskLength;
DriveExtension->DiskOffset = Input->DiskOffset;
DriveExtension->BasePage = Input->BasePage;
//
// Make sure we don't free it later