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- Jesus, Fix yet another math bug in RamdiskMapPages (we were lucky not to hit it, that's all).

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- Implement RamdiskUnmapPages.
- Need to implement MmRawDeleteVirtualMapping to make this last step work.


svn path=/trunk/; revision=34663
This commit is contained in:
ReactOS Portable Systems Group 2008-07-22 06:54:25 +00:00
parent 7fdb4518b7
commit 1f497aae89
1 changed files with 46 additions and 5 deletions
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51
reactos/drivers/storage/class/ramdisk/ramdisk.c
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@ -315,7 +315,7 @@ RamdiskMapPages(IN PRAMDISK_DRIVE_EXTENSION DeviceExtension,
//
// Calculate pages spanned for the mapping
//
ActualLength = ADDRESS_AND_SIZE_TO_SPAN_PAGES(Offset.QuadPart, Length);
ActualLength = ADDRESS_AND_SIZE_TO_SPAN_PAGES(ActualOffset.QuadPart, Length);
DPRINT1("Length in pages: %d\n", ActualLength);
//
@ -344,16 +344,57 @@ RamdiskMapPages(IN PRAMDISK_DRIVE_EXTENSION DeviceExtension,
return MappedBase;
}
PVOID
VOID
NTAPI
RamdiskUnmapPages(IN PRAMDISK_DRIVE_EXTENSION DeviceExtension,
IN PVOID BaseAddress,
IN LARGE_INTEGER Offset,
IN ULONG Length)
{
UNIMPLEMENTED;
while (TRUE);
return NULL;
LARGE_INTEGER ActualOffset;
SIZE_T ActualLength;
ULONG PageOffset;
//
// 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: %d and Offset is: %I64d. Total: %I64d\n",
DeviceExtension->DiskOffset, Offset, ActualOffset);
//
// Calculate pages spanned for the mapping
//
ActualLength = ADDRESS_AND_SIZE_TO_SPAN_PAGES(ActualOffset.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);
//
// Get the offset within the page
//
PageOffset = BYTE_OFFSET(ActualOffset.QuadPart);
DPRINT1("Page offset: %lx\n", PageOffset);
//
// Calculate actual base address where we mapped this
//
BaseAddress = (PVOID)((ULONG_PTR)BaseAddress - PageOffset);
DPRINT1("Unmapping at: %p\n", BaseAddress);
//
// Unmap the I/O space we got from the loader
//
MmUnmapIoSpace(BaseAddress, ActualLength);
}
NTSTATUS