mirror of
https://github.com/ApfelTeeSaft/reactos.git
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- Add most needed memory-manipulating functions. Some places are really crappy (like WinLdrSetProcessorContext's IDT filling), will be fixed soon.
- FIXME: Since FreeLdr doesn't really keep track of which memory is of which type, this code has a massive hack for guessing the memory type, which is incorrect for future usage svn path=/trunk/; revision=24405
This commit is contained in:
Aleksey Bragin
@@ -19,17 +19,928 @@
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#undef KIP0PCRADDRESS
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#define KIP0PCRADDRESS 0xffdff000
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//
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// This is the zone which is used by the OS loader
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//
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#define LOADER_HIGH_ZONE ((16*1024*1024) >> MM_PAGE_SHIFT) //16Mb page
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#define HYPER_SPACE_ENTRY 0x300
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//TODO: Check if this is correct
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PCHAR MemTypeDesc[] = {
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"ExceptionBlock ",
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"SystemBlock ",
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"Free ",
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"Bad ",
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"LoadedProgram ",
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"FirmwareTemporary ",
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"FirmwarePermanent ",
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"OsloaderHeap ",
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"OsloaderStack ",
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"SystemCode ",
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"HalCode ",
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"BootDriver ",
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"ConsoleInDriver ",
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"ConsoleOutDriver ",
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"StartupDpcStack ",
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"StartupKernelStack",
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"StartupPanicStack ",
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"StartupPcrPage ",
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"StartupPdrPage ",
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"RegistryData ",
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"MemoryData ",
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"NlsData ",
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"SpecialMemory ",
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"BBTMemory ",
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"Maximum "
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};
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VOID
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WinLdrpDumpMemoryDescriptors(PLOADER_PARAMETER_BLOCK LoaderBlock);
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VOID
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MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
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UINT64 BasePage,
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UINT64 PageCount,
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ULONG Type);
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VOID
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WinLdrInsertDescriptor(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
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IN PMEMORY_ALLOCATION_DESCRIPTOR NewDescriptor);
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VOID
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WinLdrRemoveDescriptor(IN PMEMORY_ALLOCATION_DESCRIPTOR Descriptor);
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VOID
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WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss);
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// This is needed only for SetProcessorContext routine
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#pragma pack(2)
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typedef struct
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{
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USHORT Limit;
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ULONG Base;
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} GDTIDT;
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#pragma pack(4)
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// this is needed for new IDT filling
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#if 0
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extern ULONG_PTR i386DivideByZero;
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extern ULONG_PTR i386DebugException;
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extern ULONG_PTR i386NMIException;
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extern ULONG_PTR i386Breakpoint;
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extern ULONG_PTR i386Overflow;
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extern ULONG_PTR i386BoundException;
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extern ULONG_PTR i386InvalidOpcode;
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extern ULONG_PTR i386FPUNotAvailable;
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extern ULONG_PTR i386DoubleFault;
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extern ULONG_PTR i386CoprocessorSegment;
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extern ULONG_PTR i386InvalidTSS;
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extern ULONG_PTR i386SegmentNotPresent;
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extern ULONG_PTR i386StackException;
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extern ULONG_PTR i386GeneralProtectionFault;
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extern ULONG_PTR i386PageFault; // exc 14
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extern ULONG_PTR i386CoprocessorError; // exc 16
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extern ULONG_PTR i386AlignmentCheck; // exc 17
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#endif
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/* GLOBALS ***************************************************************/
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PHARDWARE_PTE PDE;
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PHARDWARE_PTE HalPT;
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PUCHAR PhysicalPageTablesBuffer;
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PUCHAR KernelPageTablesBuffer;
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ULONG PhysicalPageTables;
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ULONG KernelPageTables;
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MEMORY_ALLOCATION_DESCRIPTOR Mad[1024];
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ULONG MadCount = 0;
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/* FUNCTIONS **************************************************************/
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BOOLEAN
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MempAllocatePageTables()
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{
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ULONG NumPageTables, TotalSize;
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PUCHAR Buffer;
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// It's better to allocate PDE + PTEs contigiuos
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// Max number of entries = MaxPageNum >> 10
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// FIXME: This is a number to describe ALL physical memory
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// and windows doesn't expect ALL memory mapped...
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NumPageTables = (GetSystemMemorySize() >> MM_PAGE_SHIFT) >> 10;
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DbgPrint((DPRINT_WINDOWS, "NumPageTables = %d\n", NumPageTables));
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// Allocate memory block for all these things:
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// PDE, HAL mapping page table, physical mapping, kernel mapping
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TotalSize = (1+1+NumPageTables*2)*MM_PAGE_SIZE;
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Buffer = MmAllocateMemory(TotalSize);
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if (Buffer == NULL)
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{
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UiMessageBox("Impossible to allocate memory block for page tables!");
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return FALSE;
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}
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// Zero all this memory block
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RtlZeroMemory(Buffer, TotalSize);
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// Set up pointers correctly now
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PDE = (PHARDWARE_PTE)Buffer;
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// Map the page directory at 0xC0000000 (maps itself)
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PDE[HYPER_SPACE_ENTRY].PageFrameNumber = (ULONG)PDE >> MM_PAGE_SHIFT;
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PDE[HYPER_SPACE_ENTRY].Valid = 1;
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PDE[HYPER_SPACE_ENTRY].Write = 1;
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// The last PDE slot is allocated for HAL's memory mapping (Virtual Addresses 0xFFC00000 - 0xFFFFFFFF)
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HalPT = (PHARDWARE_PTE)&Buffer[MM_PAGE_SIZE*1];
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// Map it
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PDE[1023].PageFrameNumber = (ULONG)HalPT >> MM_PAGE_SHIFT;
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PDE[1023].Valid = 1;
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PDE[1023].Write = 1;
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// Store pointers to the tables for easier access
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PhysicalPageTablesBuffer = &Buffer[MM_PAGE_SIZE*2];
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KernelPageTablesBuffer = PhysicalPageTablesBuffer + NumPageTables*MM_PAGE_SIZE;
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// Zero counters of page tables used
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PhysicalPageTables = 0;
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KernelPageTables = 0;
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return TRUE;
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}
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VOID
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MempAllocatePTE(ULONG Entry, PHARDWARE_PTE *PhysicalPT, PHARDWARE_PTE *KernelPT)
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{
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//Print(L"Creating PDE Entry %X\n", Entry);
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// Identity mapping
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*PhysicalPT = (PHARDWARE_PTE)&PhysicalPageTablesBuffer[PhysicalPageTables*MM_PAGE_SIZE];
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PhysicalPageTables++;
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PDE[Entry].PageFrameNumber = (ULONG)*PhysicalPT >> MM_PAGE_SHIFT;
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PDE[Entry].Valid = 1;
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PDE[Entry].Write = 1;
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if (Entry+(KSEG0_BASE >> 22) > 1023)
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{
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DbgPrint((DPRINT_WINDOWS, "WARNING! Entry: %X > 1023\n", Entry+(KSEG0_BASE >> 22)));
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}
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// Kernel-mode mapping
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*KernelPT = (PHARDWARE_PTE)&KernelPageTablesBuffer[KernelPageTables*MM_PAGE_SIZE];
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KernelPageTables++;
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PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber = ((ULONG)*KernelPT >> MM_PAGE_SHIFT);
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PDE[Entry+(KSEG0_BASE >> 22)].Valid = 1;
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PDE[Entry+(KSEG0_BASE >> 22)].Write = 1;
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}
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BOOLEAN
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MempSetupPaging(IN ULONG StartPage,
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IN ULONG NumberOfPages)
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{
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PHARDWARE_PTE PhysicalPT;
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PHARDWARE_PTE KernelPT;
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ULONG Entry, Page;
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//Print(L"MempSetupPaging: SP 0x%X, Number: 0x%X\n", StartPage, NumberOfPages);
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// HACK
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if (StartPage+NumberOfPages >= 0x80000)
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{
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//
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// We can't map this as it requires more than 1 PDE
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// and in fact it's not possible at all ;)
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//
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//Print(L"skipping...\n");
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return TRUE;
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}
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//
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// Now actually set up the page tables for identity mapping
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//
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for (Page=StartPage; Page < StartPage+NumberOfPages; Page++)
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{
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Entry = Page >> 10;
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if (((PULONG)PDE)[Entry] == 0)
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{
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MempAllocatePTE(Entry, &PhysicalPT, &KernelPT);
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}
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else
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{
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PhysicalPT = (PHARDWARE_PTE)(PDE[Entry].PageFrameNumber << MM_PAGE_SHIFT);
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KernelPT = (PHARDWARE_PTE)(PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber << MM_PAGE_SHIFT);
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}
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if (Page == 0)
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{
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PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;
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PhysicalPT[Page & 0x3ff].Valid = 0;
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PhysicalPT[Page & 0x3ff].Write = 0;
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KernelPT[Page & 0x3ff].PageFrameNumber = Page;
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KernelPT[Page & 0x3ff].Valid = 0;
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KernelPT[Page & 0x3ff].Write = 0;
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}
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else
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{
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PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;
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PhysicalPT[Page & 0x3ff].Valid = 1;
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PhysicalPT[Page & 0x3ff].Write = 1;
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KernelPT[Page & 0x3ff].PageFrameNumber = Page;
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KernelPT[Page & 0x3ff].Valid = 1;
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KernelPT[Page & 0x3ff].Write = 1;
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}
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}
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return TRUE;
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}
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VOID
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MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
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UINT64 BasePage,
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UINT64 PageCount,
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ULONG Type)
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{
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BOOLEAN Status;
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//
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// Check for some weird stuff at the top
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//
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if (BasePage + PageCount > 0xF0000)
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{
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//
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// Just skip this, without even adding to MAD list
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//
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return;
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}
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//
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// Base page and page count are always set
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//
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Mad[MadCount].BasePage = BasePage;
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Mad[MadCount].PageCount = PageCount;
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//
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// Check if it's more than the allowed for OS loader
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// if yes - don't map the pages, just add as FirmwareTemporary
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//
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if (BasePage + PageCount > LOADER_HIGH_ZONE)
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{
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Mad[MadCount].MemoryType = LoaderFirmwareTemporary;
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WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
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MadCount++;
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Status = MempSetupPaging(BasePage, PageCount);
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if (!Status)
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{
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DbgPrint((DPRINT_WINDOWS, "Error during WinLdrpSetupPaging\n"));
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return;
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}
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return;
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}
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if (BasePage == 0xFFF && PageCount == 1)
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{
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Mad[MadCount].MemoryType = LoaderSpecialMemory;
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WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
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MadCount++;
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//
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// Map it
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//
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Status = MempSetupPaging(BasePage, PageCount);
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if (!Status)
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{
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DbgPrint((DPRINT_WINDOWS, "Error during MempSetupPaging\n"));
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return;
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}
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}
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else if (BasePage == 0 && PageCount == 1)
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{
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Mad[MadCount].MemoryType = LoaderFirmwarePermanent;
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WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
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MadCount++;
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//
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// Map it
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//
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Status = MempSetupPaging(BasePage, PageCount);
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if (!Status)
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{
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DbgPrint((DPRINT_WINDOWS, "Error during MempSetupPaging\n"));
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return;
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}
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}
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else
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{
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//
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// Now choose memory type as usual. FIXME!!!
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//
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if (Type == 0)
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{
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Mad[MadCount].MemoryType = LoaderFree;
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}
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else if (Type != 0 && Type != 1)
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{
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Mad[MadCount].MemoryType = LoaderFirmwarePermanent;
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}
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else if (Type == 1)
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{
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Mad[MadCount].MemoryType = LoaderSystemCode;
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}
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else
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{
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Mad[MadCount].MemoryType = LoaderFirmwarePermanent;
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}
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//
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// Add descriptor
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//
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WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
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MadCount++;
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//
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// Map it
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//
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Status = MempSetupPaging(BasePage, PageCount);
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if (!Status)
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{
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DbgPrint((DPRINT_WINDOWS, "Error during MempSetupPaging\n"));
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return;
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}
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}
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}
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BOOLEAN
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WinLdrTurnOnPaging(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
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ULONG PcrBasePage,
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ULONG TssBasePage,
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PVOID GdtIdt)
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{
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return FALSE;
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ULONG i, PagesCount;
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ULONG LastPageIndex, LastPageType;
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PPAGE_LOOKUP_TABLE_ITEM MemoryMap;
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ULONG NoEntries;
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PKTSS Tss;
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//
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// Creating a suitable memory map for the Windows can be tricky, so let's
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// give a few advices:
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// 1) One must not map the whole available memory pages to PDE!
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// Map only what's needed - 16Mb, 24Mb, 32Mb max I think,
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// thus occupying 4, 6 or 8 PDE entries for identical mapping,
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// the same quantity for KSEG0_BASE mapping, one more entry for
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// hyperspace and one more entry for HAL physical pages mapping.
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// 2) Memory descriptors must map *the whole* physical memory
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// showing any memory above 16/24/32 as FirmwareTemporary
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//
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// 3) Overall memory blocks count must not exceed 30
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//
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//
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// During MmInitMachineDependent, the kernel zeroes PDE at the following address
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// 0xC0300000 - 0xC03007FC
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//
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// Then it finds the best place for non-paged pool:
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// StartPde C0300F70, EndPde C0300FF8, NumberOfPages C13, NextPhysPage 3AD
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//
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// Before we start mapping pages, create a block of memory, which will contain
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// PDE and PTEs
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if (MempAllocatePageTables() == FALSE)
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return FALSE;
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// Setup an entry for each descriptor
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MemoryMap = MmGetMemoryMap(&NoEntries);
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if (MemoryMap == NULL)
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{
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UiMessageBox("Can not retrieve the current memory map");
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return FALSE;
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}
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DbgPrint((DPRINT_WINDOWS, "Got memory map with %d entries\n"));
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// Construct a good memory map from what we've got
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PagesCount = 1;
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LastPageIndex = 0;
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LastPageType = MemoryMap[0].PageAllocated;
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for(i=1;i<NoEntries;i++)
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{
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if (MemoryMap[i].PageAllocated == LastPageType)
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{
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PagesCount++;
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}
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else
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{
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// Add the region
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MempAddMemoryBlock(LoaderBlock, LastPageIndex, PagesCount, LastPageType);
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// Reset our counter vars
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LastPageIndex = i;
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LastPageType = MemoryMap[i].PageAllocated;
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PagesCount = 1;
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}
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}
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DbgPrint((DPRINT_WINDOWS, "MadCount: %d\n", MadCount));
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WinLdrpDumpMemoryDescriptors(LoaderBlock); //FIXME: Delete!
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// Map our loader image, so we can continue running
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/*Status = MempSetupPaging(OsLoaderBase >> MM_PAGE_SHIFT, OsLoaderSize >> MM_PAGE_SHIFT);
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if (!Status)
|
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{
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UiMessageBox("Error during MempSetupPaging");
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return;
|
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}*/
|
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//VideoDisplayString(L"Hello from VGA, going into the kernel\n");
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DbgPrint((DPRINT_WINDOWS, "HalPT: 0x%X\n", HalPT));
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// Page Tables have been setup, make special handling for PCR and TSS
|
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// (which is done in BlSetupFotNt in usual ntldr)
|
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HalPT[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage+1;
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HalPT[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;
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HalPT[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;
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HalPT[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage;
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HalPT[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;
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HalPT[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;
|
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// Map VGA memory
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//VideoMemoryBase = MmMapIoSpace(0xb8000, 4000, MmNonCached);
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//DbgPrint((DPRINT_WINDOWS, "VideoMemoryBase: 0x%X\n", VideoMemoryBase));
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Tss = (PKTSS)(KSEG0_BASE | (TssBasePage << MM_PAGE_SHIFT));
|
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// Fill the memory descriptor list and
|
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//PrepareMemoryDescriptorList();
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DbgPrint((DPRINT_WINDOWS, "Memory Descriptor List prepared, printing PDE\n"));
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List_PaToVa(&LoaderBlock->MemoryDescriptorListHead);
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{
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ULONG *PDE_Addr=(ULONG *)PDE;//0xC0300000;
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int j;
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DbgPrint((DPRINT_WINDOWS, "\nPDE\n"));
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for (i=0; i<128; i++)
|
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{
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DbgPrint((DPRINT_WINDOWS, "0x%04X | ", i*8));
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||||
|
||||
for (j=0; j<8; j++)
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{
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DbgPrint((DPRINT_WINDOWS, "0x%08X ", PDE_Addr[i*8+j]));
|
||||
}
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DbgPrint((DPRINT_WINDOWS, "\n"));
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}
|
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}
|
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||||
|
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// Enable paging
|
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//BS->ExitBootServices(ImageHandle,MapKey);
|
||||
|
||||
// Disable Interrupts
|
||||
Ke386DisableInterrupts();
|
||||
|
||||
// Re-initalize EFLAGS
|
||||
Ke386EraseFlags();
|
||||
|
||||
// Set the PDBR
|
||||
Ke386SetPageTableDirectory((ULONG_PTR)PDE);
|
||||
|
||||
// Enable paging by modifying CR0
|
||||
Ke386SetCr0(Ke386GetCr0() | CR0_PG);
|
||||
|
||||
// Set processor context
|
||||
WinLdrSetProcessorContext(GdtIdt, KIP0PCRADDRESS, KSEG0_BASE | (TssBasePage << MM_PAGE_SHIFT));
|
||||
|
||||
// Zero KI_USER_SHARED_DATA page
|
||||
memset((PVOID)KI_USER_SHARED_DATA, 0, MM_PAGE_SIZE);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
// Two special things this func does: it sorts descriptors,
|
||||
// and it merges free ones
|
||||
VOID
|
||||
WinLdrInsertDescriptor(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
|
||||
IN PMEMORY_ALLOCATION_DESCRIPTOR NewDescriptor)
|
||||
{
|
||||
PLIST_ENTRY ListHead = &LoaderBlock->MemoryDescriptorListHead;
|
||||
PLIST_ENTRY PreviousEntry, NextEntry;
|
||||
PMEMORY_ALLOCATION_DESCRIPTOR PreviousDescriptor = NULL, NextDescriptor = NULL;
|
||||
|
||||
DbgPrint((DPRINT_WINDOWS, "BP=0x%X PC=0x%X %s\n", NewDescriptor->BasePage,
|
||||
NewDescriptor->PageCount, MemTypeDesc[NewDescriptor->MemoryType]));
|
||||
|
||||
/* Find a place where to insert the new descriptor to */
|
||||
PreviousEntry = ListHead;
|
||||
NextEntry = ListHead->Flink;
|
||||
while (NextEntry != ListHead)
|
||||
{
|
||||
NextDescriptor = CONTAINING_RECORD(NextEntry,
|
||||
MEMORY_ALLOCATION_DESCRIPTOR,
|
||||
ListEntry);
|
||||
if (NewDescriptor->BasePage < NextDescriptor->BasePage)
|
||||
break;
|
||||
|
||||
PreviousEntry = NextEntry;
|
||||
PreviousDescriptor = NextDescriptor;
|
||||
NextEntry = NextEntry->Flink;
|
||||
}
|
||||
|
||||
/* Don't forget about merging free areas */
|
||||
if (NewDescriptor->MemoryType != LoaderFree)
|
||||
{
|
||||
/* Just insert, nothing to merge */
|
||||
InsertHeadList(PreviousEntry, &NewDescriptor->ListEntry);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Previous block also free? */
|
||||
if ((PreviousEntry != ListHead) && (PreviousDescriptor->MemoryType == LoaderFree) &&
|
||||
((PreviousDescriptor->BasePage + PreviousDescriptor->PageCount) ==
|
||||
NewDescriptor->BasePage))
|
||||
{
|
||||
/* Just enlarge previous descriptor's PageCount */
|
||||
PreviousDescriptor->PageCount += NewDescriptor->PageCount;
|
||||
NewDescriptor = PreviousDescriptor;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Nope, just insert */
|
||||
InsertHeadList(PreviousEntry, &NewDescriptor->ListEntry);
|
||||
}
|
||||
|
||||
/* Next block is free ?*/
|
||||
if ((NextEntry != ListHead) &&
|
||||
(NextDescriptor->MemoryType == LoaderFree) &&
|
||||
((NewDescriptor->BasePage + NewDescriptor->PageCount) == NextDescriptor->BasePage))
|
||||
{
|
||||
/* Enlarge next descriptor's PageCount */
|
||||
NewDescriptor->PageCount += NextDescriptor->PageCount;
|
||||
RemoveEntryList(&NextDescriptor->ListEntry);
|
||||
}
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
VOID
|
||||
WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss)
|
||||
{
|
||||
GDTIDT GdtDesc, IdtDesc, OldIdt;
|
||||
PKGDTENTRY pGdt;
|
||||
PKIDTENTRY pIdt;
|
||||
ULONG Ldt = 0;
|
||||
//ULONG i;
|
||||
|
||||
DbgPrint((DPRINT_WINDOWS, "GDtIdt %p, Pcr %p, Tss 0x%08X\n",
|
||||
GdtIdt, Pcr, Tss));
|
||||
|
||||
// Kernel expects the PCR to be zero-filled on startup
|
||||
// FIXME: Why zero it here when we can zero it right after allocation?
|
||||
RtlZeroMemory((PVOID)Pcr, MM_PAGE_SIZE); //FIXME: Why zero only 1 page when we allocate 2?
|
||||
|
||||
// Get old values of GDT and IDT
|
||||
Ke386GetGlobalDescriptorTable(GdtDesc);
|
||||
Ke386GetInterruptDescriptorTable(IdtDesc);
|
||||
|
||||
// Save old IDT
|
||||
OldIdt.Base = IdtDesc.Base;
|
||||
OldIdt.Limit = IdtDesc.Limit;
|
||||
|
||||
// Prepare new IDT+GDT
|
||||
GdtDesc.Base = KSEG0_BASE | (ULONG_PTR)GdtIdt;
|
||||
GdtDesc.Limit = NUM_GDT * sizeof(KGDTENTRY) - 1;
|
||||
IdtDesc.Base = (ULONG)((PUCHAR)GdtDesc.Base + GdtDesc.Limit + 1);
|
||||
IdtDesc.Limit = NUM_IDT * sizeof(KIDTENTRY) - 1;
|
||||
|
||||
// ========================
|
||||
// Fill all descriptors now
|
||||
// ========================
|
||||
|
||||
pGdt = (PKGDTENTRY)GdtDesc.Base;
|
||||
pIdt = (PKIDTENTRY)IdtDesc.Base;
|
||||
|
||||
//
|
||||
// Code selector (0x8)
|
||||
// Flat 4Gb
|
||||
//
|
||||
pGdt[1].LimitLow = 0xFFFF;
|
||||
pGdt[1].BaseLow = 0;
|
||||
pGdt[1].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[1].HighWord.Bytes.Flags1 = 0x9A;
|
||||
pGdt[1].HighWord.Bytes.Flags2 = 0xCF;
|
||||
pGdt[1].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Data selector (0x10)
|
||||
// Flat 4Gb
|
||||
//
|
||||
pGdt[2].LimitLow = 0xFFFF;
|
||||
pGdt[2].BaseLow = 0;
|
||||
pGdt[2].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[2].HighWord.Bytes.Flags1 = 0x92;
|
||||
pGdt[2].HighWord.Bytes.Flags2 = 0xCF;
|
||||
pGdt[2].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x18)
|
||||
// Flat 2Gb
|
||||
//
|
||||
pGdt[3].LimitLow = 0xFFFF;
|
||||
pGdt[3].BaseLow = 0;
|
||||
pGdt[3].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[3].HighWord.Bytes.Flags1 = 0xFA;
|
||||
pGdt[3].HighWord.Bytes.Flags2 = 0xCF;
|
||||
pGdt[3].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x20)
|
||||
// Flat 2Gb
|
||||
//
|
||||
pGdt[4].LimitLow = 0xFFFF;
|
||||
pGdt[4].BaseLow = 0;
|
||||
pGdt[4].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[4].HighWord.Bytes.Flags1 = 0xF2;
|
||||
pGdt[4].HighWord.Bytes.Flags2 = 0xCF;
|
||||
pGdt[4].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// TSS Selector (0x28)
|
||||
//
|
||||
pGdt[5].LimitLow = 0x78-1; // 60 dwords
|
||||
pGdt[5].BaseLow = (USHORT)(Tss & 0xffff);
|
||||
pGdt[5].HighWord.Bytes.BaseMid = (UCHAR)((Tss >> 16) & 0xff);
|
||||
pGdt[5].HighWord.Bytes.Flags1 = 0x89;
|
||||
pGdt[5].HighWord.Bytes.Flags2 = 0x00;
|
||||
pGdt[5].HighWord.Bytes.BaseHi = (UCHAR)((Tss >> 24) & 0xff);
|
||||
|
||||
//
|
||||
// PCR Selector (0x30)
|
||||
//
|
||||
pGdt[6].LimitLow = 0x01;
|
||||
pGdt[6].BaseLow = (USHORT)(Pcr & 0xffff);
|
||||
pGdt[6].HighWord.Bytes.BaseMid = (UCHAR)((Pcr >> 16) & 0xff);
|
||||
pGdt[6].HighWord.Bytes.Flags1 = 0x92;
|
||||
pGdt[6].HighWord.Bytes.Flags2 = 0xC0;
|
||||
pGdt[6].HighWord.Bytes.BaseHi = (UCHAR)((Pcr >> 24) & 0xff);
|
||||
|
||||
//
|
||||
// Selector (0x38)
|
||||
//
|
||||
pGdt[7].LimitLow = 0xFFFF;
|
||||
pGdt[7].BaseLow = 0;
|
||||
pGdt[7].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[7].HighWord.Bytes.Flags1 = 0xF3;
|
||||
pGdt[7].HighWord.Bytes.Flags2 = 0x40;
|
||||
pGdt[7].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Some BIOS fuck (0x40)
|
||||
//
|
||||
pGdt[8].LimitLow = 0xFFFF;
|
||||
pGdt[8].BaseLow = 0x400;
|
||||
pGdt[8].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[8].HighWord.Bytes.Flags1 = 0xF2;
|
||||
pGdt[8].HighWord.Bytes.Flags2 = 0x0;
|
||||
pGdt[8].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x48)
|
||||
//
|
||||
pGdt[9].LimitLow = 0;
|
||||
pGdt[9].BaseLow = 0;
|
||||
pGdt[9].HighWord.Bytes.BaseMid = 0;
|
||||
pGdt[9].HighWord.Bytes.Flags1 = 0;
|
||||
pGdt[9].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[9].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x50)
|
||||
//
|
||||
pGdt[10].LimitLow = 0xFFFF; //FIXME: Not correct!
|
||||
pGdt[10].BaseLow = 0;
|
||||
pGdt[10].HighWord.Bytes.BaseMid = 0x2;
|
||||
pGdt[10].HighWord.Bytes.Flags1 = 0x89;
|
||||
pGdt[10].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[10].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x58)
|
||||
//
|
||||
pGdt[11].LimitLow = 0xFFFF;
|
||||
pGdt[11].BaseLow = 0;
|
||||
pGdt[11].HighWord.Bytes.BaseMid = 0x2;
|
||||
pGdt[11].HighWord.Bytes.Flags1 = 0x9A;
|
||||
pGdt[11].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[11].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Selector (0x60)
|
||||
//
|
||||
pGdt[12].LimitLow = 0xFFFF;
|
||||
pGdt[12].BaseLow = 0; //FIXME: Maybe not correct, but noone cares
|
||||
pGdt[12].HighWord.Bytes.BaseMid = 0x2;
|
||||
pGdt[12].HighWord.Bytes.Flags1 = 0x92;
|
||||
pGdt[12].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[12].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Video buffer Selector (0x68)
|
||||
//
|
||||
pGdt[13].LimitLow = 0x3FFF;
|
||||
pGdt[13].BaseLow = 0x8000; //FIXME: I guess not correct for UGA
|
||||
pGdt[13].HighWord.Bytes.BaseMid = 0x0B;
|
||||
pGdt[13].HighWord.Bytes.Flags1 = 0x92;
|
||||
pGdt[13].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[13].HighWord.Bytes.BaseHi = 0;
|
||||
|
||||
//
|
||||
// Points to GDT (0x70)
|
||||
//
|
||||
pGdt[14].LimitLow = NUM_GDT*sizeof(KGDTENTRY) - 1;
|
||||
pGdt[14].BaseLow = 0x7000;
|
||||
pGdt[14].HighWord.Bytes.BaseMid = 0xFF;
|
||||
pGdt[14].HighWord.Bytes.Flags1 = 0x92;
|
||||
pGdt[14].HighWord.Bytes.Flags2 = 0;
|
||||
pGdt[14].HighWord.Bytes.BaseHi = 0xFF;
|
||||
|
||||
//
|
||||
// Some unused descriptors should go here
|
||||
// ...
|
||||
|
||||
//
|
||||
// Fill IDT with Traps
|
||||
//
|
||||
#if 0
|
||||
pIdt[0].Offset = (i386DivideByZero | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[0].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[0].Access = 0x8F00;
|
||||
pIdt[0].Selector = (i386DivideByZero | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[1].Offset = (i386DebugException | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[1].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[1].Access = 0x8F00;
|
||||
pIdt[1].Selector = (i386DebugException | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[2].Offset = (i386NMIException | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[2].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[2].Access = 0x8F00;
|
||||
pIdt[2].Selector = (i386NMIException | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[3].Offset = (i386Breakpoint | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[3].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[3].Access = 0x8F00;
|
||||
pIdt[3].Selector = (i386Breakpoint | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[4].Offset = (i386Overflow | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[4].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[4].Access = 0x8F00;
|
||||
pIdt[4].Selector = (i386Overflow | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[5].Selector = (i386BoundException | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[5].Offset = (i386BoundException | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[5].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[5].Access = 0x8F00;
|
||||
|
||||
pIdt[6].Selector = (i386InvalidOpcode | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[6].Offset = (i386InvalidOpcode | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[6].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[6].Access = 0x8F00;
|
||||
|
||||
pIdt[7].Selector = (i386FPUNotAvailable | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[7].Offset = (i386FPUNotAvailable | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[7].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[7].Access = 0x8F00;
|
||||
|
||||
pIdt[8].Selector = (i386DoubleFault | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[8].Offset = (i386DoubleFault | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[8].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[8].Access = 0x8F00;
|
||||
|
||||
pIdt[9].Selector = (i386CoprocessorSegment | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[9].Offset = (i386CoprocessorSegment | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[9].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[9].Access = 0x8F00;
|
||||
|
||||
pIdt[10].Selector = (i386InvalidTSS | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[10].Offset = (i386InvalidTSS | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[10].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[10].Access = 0x8F00;
|
||||
|
||||
pIdt[11].Selector = (i386SegmentNotPresent | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[11].Offset = (i386SegmentNotPresent | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[11].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[11].Access = 0x8F00;
|
||||
|
||||
pIdt[12].Selector = (i386StackException | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[12].Offset = (i386StackException | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[12].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[12].Access = 0x8F00;
|
||||
|
||||
pIdt[13].Selector = (i386GeneralProtectionFault | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[13].Offset = (i386GeneralProtectionFault | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[13].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[13].Access = 0x8F00;
|
||||
|
||||
pIdt[14].Selector = (i386PageFault | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[14].Offset = (i386PageFault | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[14].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[14].Access = 0x8F00;
|
||||
|
||||
pIdt[15].Selector = 0; // Extended Offset
|
||||
pIdt[15].Offset = 0;
|
||||
pIdt[15].ExtendedOffset = 0; // Selector
|
||||
pIdt[15].Access = 0;
|
||||
|
||||
pIdt[16].Selector = (i386CoprocessorError | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[16].Offset = (i386CoprocessorError | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[16].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[16].Access = 0x8F00;
|
||||
|
||||
pIdt[17].Selector = (i386AlignmentCheck | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[17].Offset = (i386AlignmentCheck | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[17].ExtendedOffset = 0x8; // Selector
|
||||
pIdt[17].Access = 0x8F00;
|
||||
#endif
|
||||
|
||||
/*for (i=0; i<16; i++)
|
||||
{
|
||||
//pIdt[i].Offset = ((ULONG_PTR)i386GeneralProtectionFault | KSEG0_BASE) & 0xFFFF;
|
||||
//pIdt[i].ExtendedOffset = 0x8; // Selector
|
||||
//pIdt[i].Access = 0x8F00;
|
||||
//pIdt[i].Selector = ((ULONG_PTR)i386GeneralProtectionFault | KSEG0_BASE) >> 16; // Extended Offset
|
||||
|
||||
pIdt[i].Offset = ((ULONG_PTR)i386GeneralProtectionFault | KSEG0_BASE) & 0xFFFF;
|
||||
pIdt[i].ExtendedOffset = ((ULONG_PTR)i386GeneralProtectionFault | KSEG0_BASE) >> 16; // Extended Offset
|
||||
pIdt[i].Access = 0x8F00;
|
||||
pIdt[i].Selector = 0x8;
|
||||
}*/
|
||||
|
||||
// Copy the old IDT
|
||||
RtlCopyMemory(pIdt, (PVOID)OldIdt.Base, OldIdt.Limit);
|
||||
|
||||
|
||||
// Mask interrupts
|
||||
//asm("cli\n"); // they are already masked before enabling paged mode
|
||||
|
||||
// Load GDT+IDT
|
||||
Ke386SetGlobalDescriptorTable(GdtDesc);
|
||||
Ke386SetInterruptDescriptorTable(IdtDesc);
|
||||
|
||||
// Jump to proper CS and clear prefetch queue
|
||||
asm("ljmp $0x08, $mb1\n"
|
||||
"mb1:\n");
|
||||
|
||||
// Set SS selector
|
||||
asm(".intel_syntax noprefix\n");
|
||||
asm("mov ax, 0x10\n"); // DataSelector=0x10
|
||||
asm("mov ss, ax\n");
|
||||
asm(".att_syntax\n");
|
||||
|
||||
// Set DS and ES selectors
|
||||
Ke386SetDs(0x10);
|
||||
Ke386SetEs(0x10); // this is vital for rep stosd
|
||||
|
||||
// LDT = not used ever, thus set to 0
|
||||
Ke386SetLocalDescriptorTable(Ldt);
|
||||
|
||||
// Load TSR
|
||||
Ke386SetTr(0x28);
|
||||
|
||||
// Clear GS
|
||||
asm(".intel_syntax noprefix\n");
|
||||
asm("push 0\n");
|
||||
asm("pop gs\n");
|
||||
asm(".att_syntax\n");
|
||||
|
||||
// Set FS to PCR
|
||||
Ke386SetFs(0x30);
|
||||
|
||||
// Real end of the function, just for information
|
||||
/* do not uncomment!
|
||||
pop edi;
|
||||
pop esi;
|
||||
pop ebx;
|
||||
mov esp, ebp;
|
||||
pop ebp;
|
||||
ret
|
||||
*/
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user