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- Add MempDisablePages() which unmaps non-accessible memory areas from KSEG0 page table.

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svn path=/branches/winldr/; revision=25537
This commit is contained in:
Aleksey Bragin
2007-01-19 21:37:25 +00:00
parent 41911adc3d
commit 73948584ab
1 changed files with 78 additions and 1 deletions
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windows/wlmemory.c
+78 -1
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@@ -261,6 +261,56 @@ MempSetupPaging(IN ULONG StartPage,
return TRUE;
}
VOID
MempDisablePages()
{
int i;
//
// We need to delete kernel mapping from memory areas which are
// marked as Special or Permanent memory (thus non-accessible)
//
for (i=0; i<MadCount; i++)
{
if (Mad[i].MemoryType == LoaderFirmwarePermanent ||
Mad[i].MemoryType == LoaderSpecialMemory)
{
ULONG StartPage, EndPage, Page;
StartPage = Mad[i].BasePage;
EndPage = Mad[i].BasePage + Mad[i].PageCount;
//
// But, the first megabyte of memory always stays!
// And, to tell the truth, we don't care about what's higher
// than LOADER_HIGH_ZONE
if (StartPage < 0x100)
StartPage = 0x100;
if (EndPage > LOADER_HIGH_ZONE)
EndPage = LOADER_HIGH_ZONE;
for (Page = StartPage; Page < EndPage; Page++)
{
PHARDWARE_PTE KernelPT;
ULONG Entry = (Page >> 10) + (KSEG0_BASE >> 22);
if (PDE[Entry].Valid)
{
KernelPT = (PHARDWARE_PTE)(PDE[Entry].PageFrameNumber << MM_PAGE_SHIFT);
KernelPT[Page & 0x3ff].PageFrameNumber = 0;
KernelPT[Page & 0x3ff].Valid = 0;
KernelPT[Page & 0x3ff].Write = 0;
}
}
}
}
}
VOID
MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
ULONG BasePage,
@@ -423,6 +473,30 @@ WinLdrTurnOnPaging(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
}
}
// TEMP, DEBUG!
// adding special reserved memory zones for vmware workstation
#if 0
{
Mad[MadCount].BasePage = 0xfec00;
Mad[MadCount].PageCount = 0x10;
Mad[MadCount].MemoryType = LoaderSpecialMemory;
WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
MadCount++;
Mad[MadCount].BasePage = 0xfee00;
Mad[MadCount].PageCount = 0x1;
Mad[MadCount].MemoryType = LoaderSpecialMemory;
WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
MadCount++;
Mad[MadCount].BasePage = 0xfffe0;
Mad[MadCount].PageCount = 0x20;
Mad[MadCount].MemoryType = LoaderSpecialMemory;
WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
MadCount++;
}
#endif
DbgPrint((DPRINT_WINDOWS, "MadCount: %d\n", MadCount));
WinLdrpDumpMemoryDescriptors(LoaderBlock); //FIXME: Delete!
@@ -454,6 +528,9 @@ WinLdrTurnOnPaging(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
Tss = (PKTSS)(KSEG0_BASE | (TssBasePage << MM_PAGE_SHIFT));
// Unmap what is not needed from kernel page table
MempDisablePages();
// Fill the memory descriptor list and
//PrepareMemoryDescriptorList();
DbgPrint((DPRINT_WINDOWS, "Memory Descriptor List prepared, printing PDE\n"));
@@ -655,7 +732,7 @@ WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss)
//
// TSS Selector (0x28)
//
pGdt[5].LimitLow = 0x78-1; // 60 dwords
pGdt[5].LimitLow = 0x78-1; //FIXME: Check this
pGdt[5].BaseLow = (USHORT)(Tss & 0xffff);
pGdt[5].HighWord.Bytes.BaseMid = (UCHAR)((Tss >> 16) & 0xff);
pGdt[5].HighWord.Bytes.Flags1 = 0x89;