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[NTOSKRNL]

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Fix FstubFixupEfiPartition()
Add helper macro SET_PARTITION_LENGTH()

svn path=/trunk/; revision=53784
This commit is contained in:
Pierre Schweitzer 2011-09-21 09:11:42 +00:00
parent 2454366c35
commit 1f95a6dd13
2 changed files with 11 additions and 6 deletions
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11
reactos/ntoskrnl/fstub/disksup.c
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@ -1365,18 +1365,17 @@ NTAPI
FstubFixupEfiPartition(IN PPARTITION_DESCRIPTOR PartitionDescriptor,
IN ULONGLONG MaxOffset)
{
ULONG PartitionLength;
ULONG PartitionMaxOffset, PartitionLength;
PAGED_CODE();
/* Compute partition length (according to MBR entry) */
PartitionLength = PartitionDescriptor->StartingSectorLsb0 + PartitionDescriptor->PartitionLengthLsb0;
PartitionMaxOffset = GET_STARTING_SECTOR(PartitionDescriptor) + GET_PARTITION_LENGTH(PartitionDescriptor);
/* In case the partition length goes beyond disk size... */
if (PartitionLength > MaxOffset)
if (PartitionMaxOffset > MaxOffset)
{
/* Resize partition to its maximum real length */
#pragma message("--> FIXME: FstubFixupEfiPartition is most likeley broken!")
PartitionDescriptor->PartitionLengthLsb0 =
(UCHAR)(MaxOffset - PartitionDescriptor->StartingSectorLsb0);
PartitionLength = (ULONG)(PartitionMaxOffset - GET_STARTING_SECTOR(PartitionDescriptor));
SET_PARTITION_LENGTH(PartitionDescriptor, PartitionLength);
}
}

6
reactos/ntoskrnl/include/internal/hal.h
View file

@ -264,6 +264,12 @@ xKdUnmapVirtualAddress(
(ULONG)(p->PartitionLengthMsb0 << 16) + \
(ULONG)(p->PartitionLengthMsb1 << 24))
#define SET_PARTITION_LENGTH(p, l) \
p->PartitionLengthLsb0 = l & 0xFF; \
p->PartitionLengthLsb1 = (l >> 8) & 0xFF; \
p->PartitionLengthMsb0 = (l >> 16) & 0xFF; \
p->PartitionLengthMsb1 = (l >> 24) & 0xFF
//
// Structure describing a partition
//