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- Fixed the implementation of IoBuildPartialMdl.

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svn path=/trunk/; revision=9411
This commit is contained in:
Hartmut Birr 2004-05-15 22:51:38 +00:00
parent 43783f95c5
commit 189436c3ef
1 changed files with 25 additions and 9 deletions
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34
reactos/ntoskrnl/io/mdl.c
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@ -1,4 +1,4 @@
/* $Id: mdl.c,v 1.14 2004/04/20 19:01:47 gdalsnes Exp $ /* $Id: mdl.c,v 1.15 2004/05/15 22:51:38 hbirr Exp $
* *
* COPYRIGHT: See COPYING in the top level directory * COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel * PROJECT: ReactOS kernel
@ -14,6 +14,7 @@
#include <ddk/ntddk.h> #include <ddk/ntddk.h>
#include <internal/pool.h> #include <internal/pool.h>
#define NDEBUG
#include <internal/debug.h> #include <internal/debug.h>
/* GLOBALS *******************************************************************/ /* GLOBALS *******************************************************************/
@ -92,16 +93,31 @@ IoBuildPartialMdl(PMDL SourceMdl,
{ {
PULONG TargetPages = (PULONG)(TargetMdl + 1); PULONG TargetPages = (PULONG)(TargetMdl + 1);
PULONG SourcePages = (PULONG)(SourceMdl + 1); PULONG SourcePages = (PULONG)(SourceMdl + 1);
ULONG Va; ULONG Count;
ULONG Delta = (PAGE_ROUND_DOWN(VirtualAddress) - (ULONG)SourceMdl->StartVa)/ ULONG Delta;
PAGE_SIZE;
for (Va = 0; Va < (PAGE_ROUND_UP(Length)/PAGE_SIZE); Va++) DPRINT("VirtualAddress %x, SourceMdl->StartVa %x, SourceMdl->MappedSystemVa %x\n",
{ VirtualAddress, SourceMdl->StartVa, SourceMdl->MappedSystemVa);
TargetPages[Va] = SourcePages[Va+Delta];
} TargetMdl->StartVa = (PVOID)PAGE_ROUND_DOWN(VirtualAddress);
TargetMdl->ByteOffset = (ULONG_PTR)VirtualAddress - (ULONG_PTR)TargetMdl->StartVa;
TargetMdl->ByteCount = Length;
TargetMdl->Process = SourceMdl->Process;
Delta = (ULONG_PTR)VirtualAddress - ((ULONG_PTR)SourceMdl->StartVa + SourceMdl->ByteOffset);
TargetMdl->MappedSystemVa = SourceMdl->MappedSystemVa + Delta;
TargetMdl->MdlFlags = SourceMdl->MdlFlags & (MDL_IO_PAGE_READ|MDL_SOURCE_IS_NONPAGED_POOL|MDL_MAPPED_TO_SYSTEM_VA);
TargetMdl->MdlFlags |= MDL_PARTIAL; TargetMdl->MdlFlags |= MDL_PARTIAL;
Delta = ((ULONG_PTR)TargetMdl->StartVa - (ULONG_PTR)SourceMdl->StartVa) / PAGE_SIZE;
Count = ADDRESS_AND_SIZE_TO_SPAN_PAGES(VirtualAddress,Length);
SourcePages += Delta;
DPRINT("Delta %d, Count %d\n", Delta, Count);
memcpy(TargetPages, SourcePages, Count * sizeof(ULONG));
} }
/* /*