-/*\r
- * PROJECT: EFI Windows Loader\r
- * LICENSE: GPL - See COPYING in the top level directory\r
- * FILE: freeldr/winldr/wlmemory.c\r
- * PURPOSE: Memory related routines\r
- * PROGRAMMERS: Aleksey Bragin (aleksey@reactos.org)\r
- */\r
-\r
-/* INCLUDES ***************************************************************/\r
-\r
-#include <freeldr.h>\r
-\r
-#include <ndk/asm.h>\r
-#include <debug.h>\r
-\r
-extern ULONG TotalNLSSize;\r
-extern ULONG LoaderPagesSpanned;\r
-\r
-// This is needed because headers define wrong one for ReactOS\r
-#undef KIP0PCRADDRESS\r
-#define KIP0PCRADDRESS 0xffdff000\r
-\r
-#define HYPER_SPACE_ENTRY 0x300\r
-\r
-PCHAR MemTypeDesc[] = {\r
- "ExceptionBlock ", // ?\r
- "SystemBlock ", // ?\r
- "Free ",\r
- "Bad ", // used\r
- "LoadedProgram ", // == Free\r
- "FirmwareTemporary ", // == Free\r
- "FirmwarePermanent ", // == Bad\r
- "OsloaderHeap ", // used\r
- "OsloaderStack ", // == Free\r
- "SystemCode ",\r
- "HalCode ",\r
- "BootDriver ", // not used\r
- "ConsoleInDriver ", // ?\r
- "ConsoleOutDriver ", // ?\r
- "StartupDpcStack ", // ?\r
- "StartupKernelStack", // ?\r
- "StartupPanicStack ", // ?\r
- "StartupPcrPage ", // ?\r
- "StartupPdrPage ", // ?\r
- "RegistryData ", // used\r
- "MemoryData ", // not used\r
- "NlsData ", // used\r
- "SpecialMemory ", // == Bad\r
- "BBTMemory " // == Bad\r
- };\r
-\r
-VOID\r
-WinLdrpDumpMemoryDescriptors(PLOADER_PARAMETER_BLOCK LoaderBlock);\r
-\r
-\r
-VOID\r
-MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,\r
- ULONG BasePage,\r
- ULONG PageCount,\r
- ULONG Type);\r
-VOID\r
-WinLdrInsertDescriptor(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,\r
- IN PMEMORY_ALLOCATION_DESCRIPTOR NewDescriptor);\r
-\r
-VOID\r
-WinLdrRemoveDescriptor(IN PMEMORY_ALLOCATION_DESCRIPTOR Descriptor);\r
-\r
-VOID\r
-WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss);\r
-\r
-// This is needed only for SetProcessorContext routine\r
-#pragma pack(2)\r
- typedef struct\r
- {\r
- USHORT Limit;\r
- ULONG Base;\r
- } GDTIDT;\r
-#pragma pack(4)\r
-\r
-// this is needed for new IDT filling\r
-#if 0\r
-extern ULONG_PTR i386DivideByZero;\r
-extern ULONG_PTR i386DebugException;\r
-extern ULONG_PTR i386NMIException;\r
-extern ULONG_PTR i386Breakpoint;\r
-extern ULONG_PTR i386Overflow;\r
-extern ULONG_PTR i386BoundException;\r
-extern ULONG_PTR i386InvalidOpcode;\r
-extern ULONG_PTR i386FPUNotAvailable;\r
-extern ULONG_PTR i386DoubleFault;\r
-extern ULONG_PTR i386CoprocessorSegment;\r
-extern ULONG_PTR i386InvalidTSS;\r
-extern ULONG_PTR i386SegmentNotPresent;\r
-extern ULONG_PTR i386StackException;\r
-extern ULONG_PTR i386GeneralProtectionFault;\r
-extern ULONG_PTR i386PageFault; // exc 14\r
-extern ULONG_PTR i386CoprocessorError; // exc 16\r
-extern ULONG_PTR i386AlignmentCheck; // exc 17\r
-#endif\r
-\r
-/* GLOBALS ***************************************************************/\r
-\r
-PHARDWARE_PTE PDE;\r
-PHARDWARE_PTE HalPageTable;\r
-\r
-PUCHAR PhysicalPageTablesBuffer;\r
-PUCHAR KernelPageTablesBuffer;\r
-ULONG PhysicalPageTables;\r
-ULONG KernelPageTables;\r
-\r
-MEMORY_ALLOCATION_DESCRIPTOR *Mad;\r
-ULONG MadCount = 0;\r
-\r
-\r
-/* FUNCTIONS **************************************************************/\r
-\r
-BOOLEAN\r
-MempAllocatePageTables()\r
-{\r
- ULONG NumPageTables, TotalSize;\r
- PUCHAR Buffer;\r
- // It's better to allocate PDE + PTEs contigiuos\r
-\r
- // Max number of entries = MaxPageNum >> 10\r
- // FIXME: This is a number to describe ALL physical memory\r
- // and windows doesn't expect ALL memory mapped...\r
- NumPageTables = (GetSystemMemorySize() >> MM_PAGE_SHIFT) >> 10;\r
-\r
- DbgPrint((DPRINT_WINDOWS, "NumPageTables = %d\n", NumPageTables));\r
-\r
- // Allocate memory block for all these things:\r
- // PDE, HAL mapping page table, physical mapping, kernel mapping\r
- TotalSize = (1+1+NumPageTables*2)*MM_PAGE_SIZE;\r
-\r
- // PDE+HAL+KernelPTEs == MemoryData\r
- Buffer = MmAllocateMemoryWithType(\r
- TotalSize - NumPageTables*MM_PAGE_SIZE, LoaderMemoryData);\r
-\r
- // Physical PTEs = FirmwareTemporary\r
- PhysicalPageTablesBuffer = MmAllocateMemoryWithType(\r
- NumPageTables*MM_PAGE_SIZE, LoaderFirmwareTemporary);\r
-\r
- if (Buffer + (TotalSize - NumPageTables*MM_PAGE_SIZE) !=\r
- PhysicalPageTablesBuffer)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "There was a problem allocating two adjacent blocks of memory!"));\r
- }\r
-\r
- if (Buffer == NULL || PhysicalPageTablesBuffer == NULL)\r
- {\r
- UiMessageBox("Impossible to allocate memory block for page tables!");\r
- return FALSE;\r
- }\r
-\r
- // Zero all this memory block\r
- RtlZeroMemory(Buffer, TotalSize);\r
-\r
- // Set up pointers correctly now\r
- PDE = (PHARDWARE_PTE)Buffer;\r
-\r
- // Map the page directory at 0xC0000000 (maps itself)\r
- PDE[HYPER_SPACE_ENTRY].PageFrameNumber = (ULONG)PDE >> MM_PAGE_SHIFT;\r
- PDE[HYPER_SPACE_ENTRY].Valid = 1;\r
- PDE[HYPER_SPACE_ENTRY].Write = 1;\r
-\r
- // The last PDE slot is allocated for HAL's memory mapping (Virtual Addresses 0xFFC00000 - 0xFFFFFFFF)\r
- HalPageTable = (PHARDWARE_PTE)&Buffer[MM_PAGE_SIZE*1];\r
-\r
- // Map it\r
- PDE[1023].PageFrameNumber = (ULONG)HalPageTable >> MM_PAGE_SHIFT;\r
- PDE[1023].Valid = 1;\r
- PDE[1023].Write = 1;\r
-\r
- // Store pointer to the table for easier access\r
- KernelPageTablesBuffer = &Buffer[MM_PAGE_SIZE*2];\r
-\r
- // Zero counters of page tables used\r
- PhysicalPageTables = 0;\r
- KernelPageTables = 0;\r
-\r
- return TRUE;\r
-}\r
-\r
-VOID\r
-MempAllocatePTE(ULONG Entry, PHARDWARE_PTE *PhysicalPT, PHARDWARE_PTE *KernelPT)\r
-{\r
- //Print(L"Creating PDE Entry %X\n", Entry);\r
-\r
- // Identity mapping\r
- *PhysicalPT = (PHARDWARE_PTE)&PhysicalPageTablesBuffer[PhysicalPageTables*MM_PAGE_SIZE];\r
- PhysicalPageTables++;\r
-\r
- PDE[Entry].PageFrameNumber = (ULONG)*PhysicalPT >> MM_PAGE_SHIFT;\r
- PDE[Entry].Valid = 1;\r
- PDE[Entry].Write = 1;\r
-\r
- if (Entry+(KSEG0_BASE >> 22) > 1023)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "WARNING! Entry: %X > 1023\n", Entry+(KSEG0_BASE >> 22)));\r
- }\r
-\r
- // Kernel-mode mapping\r
- *KernelPT = (PHARDWARE_PTE)&KernelPageTablesBuffer[KernelPageTables*MM_PAGE_SIZE];\r
- KernelPageTables++;\r
-\r
- PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber = ((ULONG)*KernelPT >> MM_PAGE_SHIFT);\r
- PDE[Entry+(KSEG0_BASE >> 22)].Valid = 1;\r
- PDE[Entry+(KSEG0_BASE >> 22)].Write = 1;\r
-}\r
-\r
-BOOLEAN\r
-MempSetupPaging(IN ULONG StartPage,\r
- IN ULONG NumberOfPages)\r
-{\r
- PHARDWARE_PTE PhysicalPT;\r
- PHARDWARE_PTE KernelPT;\r
- ULONG Entry, Page;\r
-\r
- //Print(L"MempSetupPaging: SP 0x%X, Number: 0x%X\n", StartPage, NumberOfPages);\r
- \r
- // HACK\r
- if (StartPage+NumberOfPages >= 0x80000)\r
- {\r
- //\r
- // We can't map this as it requires more than 1 PDE\r
- // and in fact it's not possible at all ;)\r
- //\r
- //Print(L"skipping...\n");\r
- return TRUE;\r
- }\r
-\r
- //\r
- // Now actually set up the page tables for identity mapping\r
- //\r
- for (Page=StartPage; Page < StartPage+NumberOfPages; Page++)\r
- {\r
- Entry = Page >> 10;\r
-\r
- if (((PULONG)PDE)[Entry] == 0)\r
- {\r
- MempAllocatePTE(Entry, &PhysicalPT, &KernelPT);\r
- }\r
- else\r
- {\r
- PhysicalPT = (PHARDWARE_PTE)(PDE[Entry].PageFrameNumber << MM_PAGE_SHIFT);\r
- KernelPT = (PHARDWARE_PTE)(PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber << MM_PAGE_SHIFT);\r
- }\r
-\r
- if (Page == 0)\r
- {\r
- PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;\r
- PhysicalPT[Page & 0x3ff].Valid = 0;\r
- PhysicalPT[Page & 0x3ff].Write = 0;\r
-\r
- KernelPT[Page & 0x3ff].PageFrameNumber = Page;\r
- KernelPT[Page & 0x3ff].Valid = 0;\r
- KernelPT[Page & 0x3ff].Write = 0;\r
- }\r
- else\r
- {\r
- PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;\r
- PhysicalPT[Page & 0x3ff].Valid = 1;\r
- PhysicalPT[Page & 0x3ff].Write = 1;\r
-\r
- KernelPT[Page & 0x3ff].PageFrameNumber = Page;\r
- KernelPT[Page & 0x3ff].Valid = 1;\r
- KernelPT[Page & 0x3ff].Write = 1;\r
- }\r
- }\r
-\r
- return TRUE;\r
-}\r
-\r
-VOID\r
-MempDisablePages()\r
-{\r
- int i;\r
-\r
- //\r
- // We need to delete kernel mapping from memory areas which are\r
- // marked as Special or Permanent memory (thus non-accessible)\r
- //\r
-\r
- for (i=0; i<MadCount; i++)\r
- {\r
- ULONG StartPage, EndPage, Page;\r
-\r
- StartPage = Mad[i].BasePage;\r
- EndPage = Mad[i].BasePage + Mad[i].PageCount;\r
-\r
- if (Mad[i].MemoryType == LoaderFirmwarePermanent ||\r
- Mad[i].MemoryType == LoaderSpecialMemory ||\r
- Mad[i].MemoryType == LoaderFree ||\r
- (Mad[i].MemoryType == LoaderFirmwareTemporary && EndPage <= LoaderPagesSpanned) ||\r
- Mad[i].MemoryType == LoaderOsloaderStack ||\r
- Mad[i].MemoryType == LoaderLoadedProgram)\r
- {\r
- //\r
- // But, the first megabyte of memory always stays!\r
- // And, to tell the truth, we don't care about what's higher\r
- // than LoaderPagesSpanned\r
- if (Mad[i].MemoryType == LoaderFirmwarePermanent ||\r
- Mad[i].MemoryType == LoaderSpecialMemory)\r
- {\r
- if (StartPage < 0x100)\r
- StartPage = 0x100;\r
-\r
- if (EndPage > LoaderPagesSpanned)\r
- EndPage = LoaderPagesSpanned;\r
- }\r
-\r
- for (Page = StartPage; Page < EndPage; Page++)\r
- {\r
- PHARDWARE_PTE KernelPT;\r
- ULONG Entry = (Page >> 10) + (KSEG0_BASE >> 22);\r
-\r
- if (PDE[Entry].Valid)\r
- {\r
- KernelPT = (PHARDWARE_PTE)(PDE[Entry].PageFrameNumber << MM_PAGE_SHIFT);\r
-\r
- if (KernelPT)\r
- {\r
- KernelPT[Page & 0x3ff].PageFrameNumber = 0;\r
- KernelPT[Page & 0x3ff].Valid = 0;\r
- KernelPT[Page & 0x3ff].Write = 0;\r
- }\r
- }\r
- }\r
- }\r
- }\r
-}\r
-\r
-VOID\r
-MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,\r
- ULONG BasePage,\r
- ULONG PageCount,\r
- ULONG Type)\r
-{\r
- BOOLEAN Status;\r
-\r
- //\r
- // Check for some weird stuff at the top\r
- //\r
- if (BasePage + PageCount > 0xF0000)\r
- {\r
- //\r
- // Just skip this, without even adding to MAD list\r
- //\r
- return;\r
- }\r
-\r
- //\r
- // Set Base page, page count and type\r
- //\r
- Mad[MadCount].BasePage = BasePage;\r
- Mad[MadCount].PageCount = PageCount;\r
- Mad[MadCount].MemoryType = Type;\r
-\r
- //\r
- // Check if it's more than the allowed for OS loader\r
- // if yes - don't map the pages, just add as FirmwareTemporary\r
- //\r
- if (BasePage + PageCount > LoaderPagesSpanned)\r
- {\r
- if (Mad[MadCount].MemoryType != LoaderSpecialMemory &&\r
- Mad[MadCount].MemoryType != LoaderFirmwarePermanent &&\r
- Mad[MadCount].MemoryType != LoaderFree)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "Setting page %x %x to Temporary from %d\n",\r
- BasePage, PageCount, Mad[MadCount].MemoryType));\r
- Mad[MadCount].MemoryType = LoaderFirmwareTemporary;\r
- }\r
-\r
- WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);\r
- MadCount++;\r
-\r
- return;\r
- }\r
- \r
- //\r
- // Add descriptor\r
- //\r
- WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);\r
- MadCount++;\r
-\r
- //\r
- // Map it (don't map low 1Mb because it was already contigiously\r
- // mapped in WinLdrTurnOnPaging)\r
- //\r
- if (BasePage >= 0x100)\r
- {\r
- Status = MempSetupPaging(BasePage, PageCount);\r
- if (!Status)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "Error during MempSetupPaging\n"));\r
- return;\r
- }\r
- }\r
-}\r
-\r
-#ifdef _M_IX86\r
-\r
-BOOLEAN LocalAPIC = FALSE;\r
-ULONG_PTR APICAddress = 0;\r
-\r
-VOID\r
-WinLdrpMapApic()\r
-{\r
- /* Check if we have a local APIC */\r
- asm(".intel_syntax noprefix\n");\r
- asm("mov eax, 1\n");\r
- asm("cpuid\n");\r
- asm("shr edx, 9\n");\r
- asm("and edx, 0x1\n");\r
- asm("mov _LocalAPIC, edx\n");\r
- asm(".att_syntax\n");\r
-\r
- /* If there is no APIC, just return */\r
- if (!LocalAPIC)\r
- return;\r
-\r
- asm(".intel_syntax noprefix\n");\r
- asm("mov ecx, 0x1B\n");\r
- asm("rdmsr\n");\r
- asm("mov edx, eax\n");\r
- asm("and edx, 0xFFFFF000\n");\r
- asm("mov _APICAddress, edx");\r
- asm(".att_syntax\n");\r
-\r
- DbgPrint((DPRINT_WINDOWS, "Local APIC detected at address 0x%x\n",\r
- APICAddress));\r
-\r
- /* Map it */\r
- HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber\r
- = APICAddress >> MM_PAGE_SHIFT;\r
- HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;\r
- HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;\r
- HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].WriteThrough = 1;\r
- HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].CacheDisable = 1;\r
-}\r
-#else\r
-VOID\r
-WinLdrpMapApic()\r
-{\r
- /* Implement it for another arch */\r
-}\r
-#endif\r
-\r
-BOOLEAN\r
-WinLdrTurnOnPaging(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,\r
- ULONG PcrBasePage,\r
- ULONG TssBasePage,\r
- PVOID GdtIdt)\r
-{\r
- ULONG i, PagesCount, MemoryMapSizeInPages;\r
- ULONG LastPageIndex, LastPageType, MemoryMapStartPage;\r
- PPAGE_LOOKUP_TABLE_ITEM MemoryMap;\r
- ULONG NoEntries;\r
- PKTSS Tss;\r
- BOOLEAN Status;\r
-\r
- //\r
- // Creating a suitable memory map for the Windows can be tricky, so let's\r
- // give a few advices:\r
- // 1) One must not map the whole available memory pages to PDE!\r
- // Map only what's needed - 16Mb, 24Mb, 32Mb max I think,\r
- // thus occupying 4, 6 or 8 PDE entries for identical mapping,\r
- // the same quantity for KSEG0_BASE mapping, one more entry for\r
- // hyperspace and one more entry for HAL physical pages mapping.\r
- // 2) Memory descriptors must map *the whole* physical memory\r
- // showing any memory above 16/24/32 as FirmwareTemporary\r
- //\r
- // 3) Overall memory blocks count must not exceed 30 (?? why?)\r
- //\r
-\r
- //\r
- // During MmInitMachineDependent, the kernel zeroes PDE at the following address\r
- // 0xC0300000 - 0xC03007FC\r
- //\r
- // Then it finds the best place for non-paged pool:\r
- // StartPde C0300F70, EndPde C0300FF8, NumberOfPages C13, NextPhysPage 3AD\r
- //\r
-\r
- // Before we start mapping pages, create a block of memory, which will contain\r
- // PDE and PTEs\r
- if (MempAllocatePageTables() == FALSE)\r
- return FALSE;\r
-\r
- // Allocate memory for memory allocation descriptors\r
- Mad = MmHeapAlloc(sizeof(MEMORY_ALLOCATION_DESCRIPTOR) * 1024);\r
-\r
- // Setup an entry for each descriptor\r
- MemoryMap = MmGetMemoryMap(&NoEntries);\r
- if (MemoryMap == NULL)\r
- {\r
- UiMessageBox("Can not retrieve the current memory map");\r
- return FALSE;\r
- }\r
-\r
- // Calculate parameters of the memory map\r
- MemoryMapStartPage = (ULONG_PTR)MemoryMap >> MM_PAGE_SHIFT;\r
- MemoryMapSizeInPages = NoEntries * sizeof(PAGE_LOOKUP_TABLE_ITEM);\r
-\r
- DbgPrint((DPRINT_WINDOWS, "Got memory map with %d entries\n", NoEntries));\r
-\r
- // Always contigiously map low 1Mb of memory\r
- Status = MempSetupPaging(0, 0x100);\r
- if (!Status)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "Error during MempSetupPaging of low 1Mb\n"));\r
- return FALSE;\r
- }\r
-\r
- // Construct a good memory map from what we've got,\r
- // but mark entries which the memory allocation bitmap takes\r
- // as free entries (this is done in order to have the ability\r
- // to place mem alloc bitmap outside lower 16Mb zone)\r
- PagesCount = 1;\r
- LastPageIndex = 0;\r
- LastPageType = MemoryMap[0].PageAllocated;\r
- for(i=1;i<NoEntries;i++)\r
- {\r
- // Check if its memory map itself\r
- if (i >= MemoryMapStartPage &&\r
- i < (MemoryMapStartPage+MemoryMapSizeInPages))\r
- {\r
- // Exclude it if current page belongs to the memory map\r
- MemoryMap[i].PageAllocated = LoaderFree;\r
- }\r
-\r
- // Process entry\r
- if (MemoryMap[i].PageAllocated == LastPageType &&\r
- (i != NoEntries-1) )\r
- {\r
- PagesCount++;\r
- }\r
- else\r
- {\r
- // Add the resulting region\r
- MempAddMemoryBlock(LoaderBlock, LastPageIndex, PagesCount, LastPageType);\r
-\r
- // Reset our counter vars\r
- LastPageIndex = i;\r
- LastPageType = MemoryMap[i].PageAllocated;\r
- PagesCount = 1;\r
- }\r
- }\r
-\r
- // TEMP, DEBUG!\r
- // adding special reserved memory zones for vmware workstation\r
-#if 0\r
- {\r
- Mad[MadCount].BasePage = 0xfec00;\r
- Mad[MadCount].PageCount = 0x10;\r
- Mad[MadCount].MemoryType = LoaderSpecialMemory;\r
- WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);\r
- MadCount++;\r
-\r
- Mad[MadCount].BasePage = 0xfee00;\r
- Mad[MadCount].PageCount = 0x1;\r
- Mad[MadCount].MemoryType = LoaderSpecialMemory;\r
- WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);\r
- MadCount++;\r
-\r
- Mad[MadCount].BasePage = 0xfffe0;\r
- Mad[MadCount].PageCount = 0x20;\r
- Mad[MadCount].MemoryType = LoaderSpecialMemory;\r
- WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);\r
- MadCount++;\r
- }\r
-#endif\r
-\r
- DbgPrint((DPRINT_WINDOWS, "MadCount: %d\n", MadCount));\r
-\r
- WinLdrpDumpMemoryDescriptors(LoaderBlock); //FIXME: Delete!\r
-\r
- // Map our loader image, so we can continue running\r
- /*Status = MempSetupPaging(OsLoaderBase >> MM_PAGE_SHIFT, OsLoaderSize >> MM_PAGE_SHIFT);\r
- if (!Status)\r
- {\r
- UiMessageBox("Error during MempSetupPaging");\r
- return;\r
- }*/\r
-\r
- //VideoDisplayString(L"Hello from VGA, going into the kernel\n");\r
- DbgPrint((DPRINT_WINDOWS, "HalPageTable: 0x%X\n", HalPageTable));\r
-\r
- // Page Tables have been setup, make special handling for PCR and TSS\r
- // (which is done in BlSetupFotNt in usual ntldr)\r
- HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage+1;\r
- HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;\r
- HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;\r
-\r
- HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage;\r
- HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;\r
- HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;\r
-\r
- // Map APIC\r
- WinLdrpMapApic();\r
-\r
- // Map VGA memory\r
- //VideoMemoryBase = MmMapIoSpace(0xb8000, 4000, MmNonCached);\r
- //DbgPrint((DPRINT_WINDOWS, "VideoMemoryBase: 0x%X\n", VideoMemoryBase));\r
-\r
- Tss = (PKTSS)(KSEG0_BASE | (TssBasePage << MM_PAGE_SHIFT));\r
-\r
- // Unmap what is not needed from kernel page table\r
- MempDisablePages();\r
-\r
- // Fill the memory descriptor list and \r
- //PrepareMemoryDescriptorList();\r
- DbgPrint((DPRINT_WINDOWS, "Memory Descriptor List prepared, printing PDE\n"));\r
- List_PaToVa(&LoaderBlock->MemoryDescriptorListHead);\r
-\r
-#ifdef DBG\r
- {\r
- ULONG *PDE_Addr=(ULONG *)PDE;//0xC0300000;\r
- int j;\r
-\r
- DbgPrint((DPRINT_WINDOWS, "\nPDE\n"));\r
-\r
- for (i=0; i<128; i++)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "0x%04X | ", i*8));\r
-\r
- for (j=0; j<8; j++)\r
- {\r
- DbgPrint((DPRINT_WINDOWS, "0x%08X ", PDE_Addr[i*8+j]));\r
- }\r
-\r
- DbgPrint((DPRINT_WINDOWS, "\n"));\r
- }\r
- }\r
-#endif\r
-\r
-\r
- // Enable paging\r
- //BS->ExitBootServices(ImageHandle,MapKey);\r
-\r
- // Disable Interrupts\r
- _disable();\r
-\r
- // Re-initalize EFLAGS\r
- Ke386EraseFlags();\r
-\r
- // Set the PDBR\r
- __writecr3((ULONG_PTR)PDE);\r
-\r
- // Enable paging by modifying CR0\r
- __writecr0(__readcr0() | CR0_PG);\r
-\r
- // Set processor context\r
- WinLdrSetProcessorContext(GdtIdt, KIP0PCRADDRESS, KSEG0_BASE | (TssBasePage << MM_PAGE_SHIFT));\r
-\r
- // Zero KI_USER_SHARED_DATA page\r
- memset((PVOID)KI_USER_SHARED_DATA, 0, MM_PAGE_SIZE);\r
-\r
- return TRUE;\r
-}\r
-\r
-// Two special things this func does: it sorts descriptors,\r
-// and it merges free ones\r
-VOID\r
-WinLdrInsertDescriptor(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,\r
- IN PMEMORY_ALLOCATION_DESCRIPTOR NewDescriptor)\r
-{\r
- PLIST_ENTRY ListHead = &LoaderBlock->MemoryDescriptorListHead;\r
- PLIST_ENTRY PreviousEntry, NextEntry;\r
- PMEMORY_ALLOCATION_DESCRIPTOR PreviousDescriptor = NULL, NextDescriptor = NULL;\r
-\r
- DbgPrint((DPRINT_WINDOWS, "BP=0x%X PC=0x%X %s\n", NewDescriptor->BasePage,\r
- NewDescriptor->PageCount, MemTypeDesc[NewDescriptor->MemoryType]));\r
-\r
- /* Find a place where to insert the new descriptor to */\r
- PreviousEntry = ListHead;\r
- NextEntry = ListHead->Flink;\r
- while (NextEntry != ListHead)\r
- {\r
- NextDescriptor = CONTAINING_RECORD(NextEntry,\r
- MEMORY_ALLOCATION_DESCRIPTOR,\r
- ListEntry);\r
- if (NewDescriptor->BasePage < NextDescriptor->BasePage)\r
- break;\r
-\r
- PreviousEntry = NextEntry;\r
- PreviousDescriptor = NextDescriptor;\r
- NextEntry = NextEntry->Flink;\r
- }\r
-\r
- /* Don't forget about merging free areas */\r
- if (NewDescriptor->MemoryType != LoaderFree)\r
- {\r
- /* Just insert, nothing to merge */\r
- InsertHeadList(PreviousEntry, &NewDescriptor->ListEntry);\r
- }\r
- else\r
- {\r
- /* Previous block also free? */\r
- if ((PreviousEntry != ListHead) && (PreviousDescriptor->MemoryType == LoaderFree) &&\r
- ((PreviousDescriptor->BasePage + PreviousDescriptor->PageCount) ==\r
- NewDescriptor->BasePage))\r
- {\r
- /* Just enlarge previous descriptor's PageCount */\r
- PreviousDescriptor->PageCount += NewDescriptor->PageCount;\r
- NewDescriptor = PreviousDescriptor;\r
- }\r
- else\r
- {\r
- /* Nope, just insert */\r
- InsertHeadList(PreviousEntry, &NewDescriptor->ListEntry);\r
- }\r
-\r
- /* Next block is free ?*/\r
- if ((NextEntry != ListHead) &&\r
- (NextDescriptor->MemoryType == LoaderFree) &&\r
- ((NewDescriptor->BasePage + NewDescriptor->PageCount) == NextDescriptor->BasePage))\r
- {\r
- /* Enlarge next descriptor's PageCount */\r
- NewDescriptor->PageCount += NextDescriptor->PageCount;\r
- RemoveEntryList(&NextDescriptor->ListEntry);\r
- }\r
- }\r
-\r
- return;\r
-}\r
-\r
-VOID\r
-WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss)\r
-{\r
- GDTIDT GdtDesc, IdtDesc, OldIdt;\r
- PKGDTENTRY pGdt;\r
- PKIDTENTRY pIdt;\r
- ULONG Ldt = 0;\r
- //ULONG i;\r
-\r
- DbgPrint((DPRINT_WINDOWS, "GDtIdt %p, Pcr %p, Tss 0x%08X\n",\r
- GdtIdt, Pcr, Tss));\r
-\r
- // Kernel expects the PCR to be zero-filled on startup\r
- // FIXME: Why zero it here when we can zero it right after allocation?\r
- RtlZeroMemory((PVOID)Pcr, MM_PAGE_SIZE); //FIXME: Why zero only 1 page when we allocate 2?\r
-\r
- // Get old values of GDT and IDT\r
- Ke386GetGlobalDescriptorTable(GdtDesc);\r
- Ke386GetInterruptDescriptorTable(IdtDesc);\r
-\r
- // Save old IDT\r
- OldIdt.Base = IdtDesc.Base;\r
- OldIdt.Limit = IdtDesc.Limit;\r
-\r
- // Prepare new IDT+GDT\r
- GdtDesc.Base = KSEG0_BASE | (ULONG_PTR)GdtIdt;\r
- GdtDesc.Limit = NUM_GDT * sizeof(KGDTENTRY) - 1;\r
- IdtDesc.Base = (ULONG)((PUCHAR)GdtDesc.Base + GdtDesc.Limit + 1);\r
- IdtDesc.Limit = NUM_IDT * sizeof(KIDTENTRY) - 1;\r
-\r
- // ========================\r
- // Fill all descriptors now\r
- // ========================\r
-\r
- pGdt = (PKGDTENTRY)GdtDesc.Base;\r
- pIdt = (PKIDTENTRY)IdtDesc.Base;\r
-\r
- //\r
- // Code selector (0x8)\r
- // Flat 4Gb\r
- //\r
- pGdt[1].LimitLow = 0xFFFF;\r
- pGdt[1].BaseLow = 0;\r
- pGdt[1].HighWord.Bytes.BaseMid = 0;\r
- pGdt[1].HighWord.Bytes.Flags1 = 0x9A;\r
- pGdt[1].HighWord.Bytes.Flags2 = 0xCF;\r
- pGdt[1].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Data selector (0x10)\r
- // Flat 4Gb\r
- //\r
- pGdt[2].LimitLow = 0xFFFF;\r
- pGdt[2].BaseLow = 0;\r
- pGdt[2].HighWord.Bytes.BaseMid = 0;\r
- pGdt[2].HighWord.Bytes.Flags1 = 0x92;\r
- pGdt[2].HighWord.Bytes.Flags2 = 0xCF;\r
- pGdt[2].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x18)\r
- // Flat 2Gb\r
- //\r
- pGdt[3].LimitLow = 0xFFFF;\r
- pGdt[3].BaseLow = 0;\r
- pGdt[3].HighWord.Bytes.BaseMid = 0;\r
- pGdt[3].HighWord.Bytes.Flags1 = 0xFA;\r
- pGdt[3].HighWord.Bytes.Flags2 = 0xCF;\r
- pGdt[3].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x20)\r
- // Flat 2Gb\r
- //\r
- pGdt[4].LimitLow = 0xFFFF;\r
- pGdt[4].BaseLow = 0;\r
- pGdt[4].HighWord.Bytes.BaseMid = 0;\r
- pGdt[4].HighWord.Bytes.Flags1 = 0xF2;\r
- pGdt[4].HighWord.Bytes.Flags2 = 0xCF;\r
- pGdt[4].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // TSS Selector (0x28)\r
- //\r
- pGdt[5].LimitLow = 0x78-1; //FIXME: Check this\r
- pGdt[5].BaseLow = (USHORT)(Tss & 0xffff);\r
- pGdt[5].HighWord.Bytes.BaseMid = (UCHAR)((Tss >> 16) & 0xff);\r
- pGdt[5].HighWord.Bytes.Flags1 = 0x89;\r
- pGdt[5].HighWord.Bytes.Flags2 = 0x00;\r
- pGdt[5].HighWord.Bytes.BaseHi = (UCHAR)((Tss >> 24) & 0xff);\r
-\r
- //\r
- // PCR Selector (0x30)\r
- //\r
- pGdt[6].LimitLow = 0x01;\r
- pGdt[6].BaseLow = (USHORT)(Pcr & 0xffff);\r
- pGdt[6].HighWord.Bytes.BaseMid = (UCHAR)((Pcr >> 16) & 0xff);\r
- pGdt[6].HighWord.Bytes.Flags1 = 0x92;\r
- pGdt[6].HighWord.Bytes.Flags2 = 0xC0;\r
- pGdt[6].HighWord.Bytes.BaseHi = (UCHAR)((Pcr >> 24) & 0xff);\r
-\r
- //\r
- // Selector (0x38)\r
- //\r
- pGdt[7].LimitLow = 0xFFFF;\r
- pGdt[7].BaseLow = 0;\r
- pGdt[7].HighWord.Bytes.BaseMid = 0;\r
- pGdt[7].HighWord.Bytes.Flags1 = 0xF3;\r
- pGdt[7].HighWord.Bytes.Flags2 = 0x40;\r
- pGdt[7].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Some BIOS stuff (0x40)\r
- //\r
- pGdt[8].LimitLow = 0xFFFF;\r
- pGdt[8].BaseLow = 0x400;\r
- pGdt[8].HighWord.Bytes.BaseMid = 0;\r
- pGdt[8].HighWord.Bytes.Flags1 = 0xF2;\r
- pGdt[8].HighWord.Bytes.Flags2 = 0x0;\r
- pGdt[8].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x48)\r
- //\r
- pGdt[9].LimitLow = 0;\r
- pGdt[9].BaseLow = 0;\r
- pGdt[9].HighWord.Bytes.BaseMid = 0;\r
- pGdt[9].HighWord.Bytes.Flags1 = 0;\r
- pGdt[9].HighWord.Bytes.Flags2 = 0;\r
- pGdt[9].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x50)\r
- //\r
- pGdt[10].LimitLow = 0xFFFF; //FIXME: Not correct!\r
- pGdt[10].BaseLow = 0;\r
- pGdt[10].HighWord.Bytes.BaseMid = 0x2;\r
- pGdt[10].HighWord.Bytes.Flags1 = 0x89;\r
- pGdt[10].HighWord.Bytes.Flags2 = 0;\r
- pGdt[10].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x58)\r
- //\r
- pGdt[11].LimitLow = 0xFFFF;\r
- pGdt[11].BaseLow = 0;\r
- pGdt[11].HighWord.Bytes.BaseMid = 0x2;\r
- pGdt[11].HighWord.Bytes.Flags1 = 0x9A;\r
- pGdt[11].HighWord.Bytes.Flags2 = 0;\r
- pGdt[11].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Selector (0x60)\r
- //\r
- pGdt[12].LimitLow = 0xFFFF;\r
- pGdt[12].BaseLow = 0; //FIXME: Maybe not correct, but noone cares\r
- pGdt[12].HighWord.Bytes.BaseMid = 0x2;\r
- pGdt[12].HighWord.Bytes.Flags1 = 0x92;\r
- pGdt[12].HighWord.Bytes.Flags2 = 0;\r
- pGdt[12].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Video buffer Selector (0x68)\r
- //\r
- pGdt[13].LimitLow = 0x3FFF;\r
- pGdt[13].BaseLow = 0x8000;\r
- pGdt[13].HighWord.Bytes.BaseMid = 0x0B;\r
- pGdt[13].HighWord.Bytes.Flags1 = 0x92;\r
- pGdt[13].HighWord.Bytes.Flags2 = 0;\r
- pGdt[13].HighWord.Bytes.BaseHi = 0;\r
-\r
- //\r
- // Points to GDT (0x70)\r
- //\r
- pGdt[14].LimitLow = NUM_GDT*sizeof(KGDTENTRY) - 1;\r
- pGdt[14].BaseLow = 0x7000;\r
- pGdt[14].HighWord.Bytes.BaseMid = 0xFF;\r
- pGdt[14].HighWord.Bytes.Flags1 = 0x92;\r
- pGdt[14].HighWord.Bytes.Flags2 = 0;\r
- pGdt[14].HighWord.Bytes.BaseHi = 0xFF;\r
-\r
- //\r
- // Some unused descriptors should go here\r
- //\r
-\r
- // Copy the old IDT\r
- RtlCopyMemory(pIdt, (PVOID)OldIdt.Base, OldIdt.Limit);\r
-\r
- // Mask interrupts\r
- //asm("cli\n"); // they are already masked before enabling paged mode\r
-\r
- // Load GDT+IDT\r
- Ke386SetGlobalDescriptorTable(GdtDesc);\r
- Ke386SetInterruptDescriptorTable(IdtDesc);\r
-\r
- // Jump to proper CS and clear prefetch queue\r
- asm("ljmp $0x08, $mb1\n"\r
- "mb1:\n");\r
-\r
- // Set SS selector\r
- asm(".intel_syntax noprefix\n");\r
- asm("mov ax, 0x10\n"); // DataSelector=0x10\r
- asm("mov ss, ax\n");\r
- asm(".att_syntax\n");\r
-\r
- // Set DS and ES selectors\r
- Ke386SetDs(0x10);\r
- Ke386SetEs(0x10); // this is vital for rep stosd\r
-\r
- // LDT = not used ever, thus set to 0\r
- Ke386SetLocalDescriptorTable(Ldt);\r
-\r
- // Load TSR\r
- Ke386SetTr(0x28);\r
-\r
- // Clear GS\r
- asm(".intel_syntax noprefix\n");\r
- asm("push 0\n");\r
- asm("pop gs\n");\r
- asm(".att_syntax\n");\r
-\r
- // Set FS to PCR\r
- Ke386SetFs(0x30);\r
-\r
- // Real end of the function, just for information\r
- /* do not uncomment!\r
- pop edi;\r
- pop esi;\r
- pop ebx;\r
- mov esp, ebp;\r
- pop ebp;\r
- ret\r
- */\r
-}\r
+/*
+ * PROJECT: EFI Windows Loader
+ * LICENSE: GPL - See COPYING in the top level directory
+ * FILE: freeldr/winldr/wlmemory.c
+ * PURPOSE: Memory related routines
+ * PROGRAMMERS: Aleksey Bragin (aleksey@reactos.org)
+ */
+
+/* INCLUDES ***************************************************************/
+
+#include <freeldr.h>
+
+#include <ndk/asm.h>
+#include <debug.h>
+
+extern ULONG TotalNLSSize;
+extern ULONG LoaderPagesSpanned;
+
+// This is needed because headers define wrong one for ReactOS
+#undef KIP0PCRADDRESS
+#define KIP0PCRADDRESS 0xffdff000
+
+#define HYPER_SPACE_ENTRY 0x300
+
+PCHAR MemTypeDesc[] = {
+ "ExceptionBlock ", // ?
+ "SystemBlock ", // ?
+ "Free ",
+ "Bad ", // used
+ "LoadedProgram ", // == Free
+ "FirmwareTemporary ", // == Free
+ "FirmwarePermanent ", // == Bad
+ "OsloaderHeap ", // used
+ "OsloaderStack ", // == Free
+ "SystemCode ",
+ "HalCode ",
+ "BootDriver ", // not used
+ "ConsoleInDriver ", // ?
+ "ConsoleOutDriver ", // ?
+ "StartupDpcStack ", // ?
+ "StartupKernelStack", // ?
+ "StartupPanicStack ", // ?
+ "StartupPcrPage ", // ?
+ "StartupPdrPage ", // ?
+ "RegistryData ", // used
+ "MemoryData ", // not used
+ "NlsData ", // used
+ "SpecialMemory ", // == Bad
+ "BBTMemory " // == Bad
+ };
+
+VOID
+WinLdrpDumpMemoryDescriptors(PLOADER_PARAMETER_BLOCK LoaderBlock);
+
+
+VOID
+MempAddMemoryBlock(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
+ ULONG BasePage,
+ ULONG PageCount,
+ ULONG Type);
+VOID
+WinLdrInsertDescriptor(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
+ IN PMEMORY_ALLOCATION_DESCRIPTOR NewDescriptor);
+
+VOID
+WinLdrRemoveDescriptor(IN PMEMORY_ALLOCATION_DESCRIPTOR Descriptor);
+
+VOID
+WinLdrSetProcessorContext(PVOID GdtIdt, IN ULONG Pcr, IN ULONG Tss);
+
+// This is needed only for SetProcessorContext routine
+#pragma pack(2)
+ typedef struct
+ {
+ USHORT Limit;
+ ULONG Base;
+ } GDTIDT;
+#pragma pack(4)
+
+// this is needed for new IDT filling
+#if 0
+extern ULONG_PTR i386DivideByZero;
+extern ULONG_PTR i386DebugException;
+extern ULONG_PTR i386NMIException;
+extern ULONG_PTR i386Breakpoint;
+extern ULONG_PTR i386Overflow;
+extern ULONG_PTR i386BoundException;
+extern ULONG_PTR i386InvalidOpcode;
+extern ULONG_PTR i386FPUNotAvailable;
+extern ULONG_PTR i386DoubleFault;
+extern ULONG_PTR i386CoprocessorSegment;
+extern ULONG_PTR i386InvalidTSS;
+extern ULONG_PTR i386SegmentNotPresent;
+extern ULONG_PTR i386StackException;
+extern ULONG_PTR i386GeneralProtectionFault;
+extern ULONG_PTR i386PageFault; // exc 14
+extern ULONG_PTR i386CoprocessorError; // exc 16
+extern ULONG_PTR i386AlignmentCheck; // exc 17
+#endif
+
+/* GLOBALS ***************************************************************/
+
+PHARDWARE_PTE PDE;
+PHARDWARE_PTE HalPageTable;
+
+PUCHAR PhysicalPageTablesBuffer;
+PUCHAR KernelPageTablesBuffer;
+ULONG PhysicalPageTables;
+ULONG KernelPageTables;
+
+MEMORY_ALLOCATION_DESCRIPTOR *Mad;
+ULONG MadCount = 0;
+
+
+/* FUNCTIONS **************************************************************/
+
+BOOLEAN
+MempAllocatePageTables()
+{
+ ULONG NumPageTables, TotalSize;
+ PUCHAR Buffer;
+ // It's better to allocate PDE + PTEs contigiuos
+
+ // Max number of entries = MaxPageNum >> 10
+ // FIXME: This is a number to describe ALL physical memory
+ // and windows doesn't expect ALL memory mapped...
+ NumPageTables = (GetSystemMemorySize() >> MM_PAGE_SHIFT) >> 10;
+
+ DPRINTM(DPRINT_WINDOWS, "NumPageTables = %d\n", NumPageTables);
+
+ // Allocate memory block for all these things:
+ // PDE, HAL mapping page table, physical mapping, kernel mapping
+ TotalSize = (1+1+NumPageTables*2)*MM_PAGE_SIZE;
+
+ // PDE+HAL+KernelPTEs == MemoryData
+ Buffer = MmAllocateMemoryWithType(TotalSize, LoaderMemoryData);
+
+ // Physical PTEs = FirmwareTemporary
+ PhysicalPageTablesBuffer = (PUCHAR)Buffer + TotalSize - NumPageTables*MM_PAGE_SIZE;
+ MmSetMemoryType(PhysicalPageTablesBuffer,
+ NumPageTables*MM_PAGE_SIZE,
+ LoaderFirmwareTemporary);
+
+ // This check is now redundant
+ if (Buffer + (TotalSize - NumPageTables*MM_PAGE_SIZE) !=
+ PhysicalPageTablesBuffer)
+ {
+ DPRINTM(DPRINT_WINDOWS, "There was a problem allocating two adjacent blocks of memory!");
+ }
+
+ if (Buffer == NULL || PhysicalPageTablesBuffer == NULL)
+ {
+ UiMessageBox("Impossible to allocate memory block for page tables!");
+ return FALSE;
+ }
+
+ // Zero all this memory block
+ RtlZeroMemory(Buffer, TotalSize);
+
+ // Set up pointers correctly now
+ PDE = (PHARDWARE_PTE)Buffer;
+
+ // Map the page directory at 0xC0000000 (maps itself)
+ PDE[HYPER_SPACE_ENTRY].PageFrameNumber = (ULONG)PDE >> MM_PAGE_SHIFT;
+ PDE[HYPER_SPACE_ENTRY].Valid = 1;
+ PDE[HYPER_SPACE_ENTRY].Write = 1;
+
+ // The last PDE slot is allocated for HAL's memory mapping (Virtual Addresses 0xFFC00000 - 0xFFFFFFFF)
+ HalPageTable = (PHARDWARE_PTE)&Buffer[MM_PAGE_SIZE*1];
+
+ // Map it
+ PDE[1023].PageFrameNumber = (ULONG)HalPageTable >> MM_PAGE_SHIFT;
+ PDE[1023].Valid = 1;
+ PDE[1023].Write = 1;
+
+ // Store pointer to the table for easier access
+ KernelPageTablesBuffer = &Buffer[MM_PAGE_SIZE*2];
+
+ // Zero counters of page tables used
+ PhysicalPageTables = 0;
+ KernelPageTables = 0;
+
+ return TRUE;
+}
+
+VOID
+MempAllocatePTE(ULONG Entry, PHARDWARE_PTE *PhysicalPT, PHARDWARE_PTE *KernelPT)
+{
+ //Print(L"Creating PDE Entry %X\n", Entry);
+
+ // Identity mapping
+ *PhysicalPT = (PHARDWARE_PTE)&PhysicalPageTablesBuffer[PhysicalPageTables*MM_PAGE_SIZE];
+ PhysicalPageTables++;
+
+ PDE[Entry].PageFrameNumber = (ULONG)*PhysicalPT >> MM_PAGE_SHIFT;
+ PDE[Entry].Valid = 1;
+ PDE[Entry].Write = 1;
+
+ if (Entry+(KSEG0_BASE >> 22) > 1023)
+ {
+ DPRINTM(DPRINT_WINDOWS, "WARNING! Entry: %X > 1023\n", Entry+(KSEG0_BASE >> 22));
+ }
+
+ // Kernel-mode mapping
+ *KernelPT = (PHARDWARE_PTE)&KernelPageTablesBuffer[KernelPageTables*MM_PAGE_SIZE];
+ KernelPageTables++;
+
+ PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber = ((ULONG)*KernelPT >> MM_PAGE_SHIFT);
+ PDE[Entry+(KSEG0_BASE >> 22)].Valid = 1;
+ PDE[Entry+(KSEG0_BASE >> 22)].Write = 1;
+}
+
+BOOLEAN
+MempSetupPaging(IN ULONG StartPage,
+ IN ULONG NumberOfPages)
+{
+ PHARDWARE_PTE PhysicalPT;
+ PHARDWARE_PTE KernelPT;
+ ULONG Entry, Page;
+
+ //Print(L"MempSetupPaging: SP 0x%X, Number: 0x%X\n", StartPage, NumberOfPages);
+
+ // HACK
+ if (StartPage+NumberOfPages >= 0x80000)
+ {
+ //
+ // We can't map this as it requires more than 1 PDE
+ // and in fact it's not possible at all ;)
+ //
+ //Print(L"skipping...\n");
+ return TRUE;
+ }
+
+ //
+ // Now actually set up the page tables for identity mapping
+ //
+ for (Page=StartPage; Page < StartPage+NumberOfPages; Page++)
+ {
+ Entry = Page >> 10;
+
+ if (((PULONG)PDE)[Entry] == 0)
+ {
+ MempAllocatePTE(Entry, &PhysicalPT, &KernelPT);
+ }
+ else
+ {
+ PhysicalPT = (PHARDWARE_PTE)(PDE[Entry].PageFrameNumber << MM_PAGE_SHIFT);
+ KernelPT = (PHARDWARE_PTE)(PDE[Entry+(KSEG0_BASE >> 22)].PageFrameNumber << MM_PAGE_SHIFT);
+ }
+
+ if (Page == 0)
+ {
+ PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;
+ PhysicalPT[Page & 0x3ff].Valid = 0;
+ PhysicalPT[Page & 0x3ff].Write = 0;
+
+ KernelPT[Page & 0x3ff].PageFrameNumber = Page;
+ KernelPT[Page & 0x3ff].Valid = 0;
+ KernelPT[Page & 0x3ff].Write = 0;
+ }
+ else
+ {
+ PhysicalPT[Page & 0x3ff].PageFrameNumber = Page;
+ PhysicalPT[Page & 0x3ff].Valid = 1;
+ PhysicalPT[Page & 0x3ff].Write = 1;
+
+ KernelPT[Page & 0x3ff].PageFrameNumber = Page;
+ KernelPT[Page & 0x3ff].Valid = 1;
+ KernelPT[Page & 0x3ff].Write = 1;
+ }
+ }
+
+ return TRUE;
+}
+
+VOID
+MempDisablePages()
+{
+ ULONG 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++)
+ {
+ ULONG StartPage, EndPage, Page;
+
+ StartPage = Mad[i].BasePage;
+ EndPage = Mad[i].BasePage + Mad[i].PageCount;
+
+ if (Mad[i].MemoryType == LoaderFirmwarePermanent ||
+ Mad[i].MemoryType == LoaderSpecialMemory ||
+ Mad[i].MemoryType == LoaderFree ||
+ (Mad[i].MemoryType == LoaderFirmwareTemporary && EndPage <= LoaderPagesSpanned) ||
+ Mad[i].MemoryType == LoaderOsloaderStack ||
+ Mad[i].MemoryType == LoaderLoadedProgram)
+ {
+ //
+ // But, the first megabyte of memory always stays!
+ // And, to tell the truth, we don't care about what's higher
+ // than LoaderPagesSpanned
+ if (Mad[i].MemoryType == LoaderFirmwarePermanent ||
+ Mad[i].MemoryType == LoaderSpecialMemory)
+ {
+ if (StartPage < 0x100)
+ StartPage = 0x100;
+
+ if (EndPage > LoaderPagesSpanned)
+ EndPage = LoaderPagesSpanned;
+ }
+
+ 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);
+
+ if (KernelPT)
+ {
+ 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,
+ ULONG PageCount,
+ ULONG Type)
+{
+ BOOLEAN Status;
+
+ //
+ // Check for some weird stuff at the top
+ //
+ if (BasePage + PageCount > 0xF0000)
+ {
+ //
+ // Just skip this, without even adding to MAD list
+ //
+ return;
+ }
+
+ //
+ // Set Base page, page count and type
+ //
+ Mad[MadCount].BasePage = BasePage;
+ Mad[MadCount].PageCount = PageCount;
+ Mad[MadCount].MemoryType = Type;
+
+ //
+ // Check if it's more than the allowed for OS loader
+ // if yes - don't map the pages, just add as FirmwareTemporary
+ //
+ if (BasePage + PageCount > LoaderPagesSpanned)
+ {
+ if (Mad[MadCount].MemoryType != LoaderSpecialMemory &&
+ Mad[MadCount].MemoryType != LoaderFirmwarePermanent &&
+ Mad[MadCount].MemoryType != LoaderFree)
+ {
+ DPRINTM(DPRINT_WINDOWS, "Setting page %x %x to Temporary from %d\n",
+ BasePage, PageCount, Mad[MadCount].MemoryType);
+ Mad[MadCount].MemoryType = LoaderFirmwareTemporary;
+ }
+
+ WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
+ MadCount++;
+
+ return;
+ }
+
+ //
+ // Add descriptor
+ //
+ WinLdrInsertDescriptor(LoaderBlock, &Mad[MadCount]);
+ MadCount++;
+
+ //
+ // Map it (don't map low 1Mb because it was already contigiously
+ // mapped in WinLdrTurnOnPaging)
+ //
+ if (BasePage >= 0x100)
+ {
+ Status = MempSetupPaging(BasePage, PageCount);
+ if (!Status)
+ {
+ DPRINTM(DPRINT_WINDOWS, "Error during MempSetupPaging\n");
+ return;
+ }
+ }
+}
+
+#ifdef _M_IX86
+
+BOOLEAN LocalAPIC = FALSE;
+ULONG_PTR APICAddress = 0;
+
+VOID
+WinLdrpMapApic()
+{
+ /* Check if we have a local APIC */
+ asm(".intel_syntax noprefix\n");
+ asm("mov eax, 1\n");
+ asm("cpuid\n");
+ asm("shr edx, 9\n");
+ asm("and edx, 0x1\n");
+ asm("mov _LocalAPIC, edx\n");
+ asm(".att_syntax\n");
+
+ /* If there is no APIC, just return */
+ if (!LocalAPIC)
+ return;
+
+ asm(".intel_syntax noprefix\n");
+ asm("mov ecx, 0x1B\n");
+ asm("rdmsr\n");
+ asm("mov edx, eax\n");
+ asm("and edx, 0xFFFFF000\n");
+ asm("mov _APICAddress, edx");
+ asm(".att_syntax\n");
+
+ DPRINTM(DPRINT_WINDOWS, "Local APIC detected at address 0x%x\n",
+ APICAddress);
+
+ /* Map it */
+ HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber
+ = APICAddress >> MM_PAGE_SHIFT;
+ HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;
+ HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;
+ HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].WriteThrough = 1;
+ HalPageTable[(APIC_BASE - 0xFFC00000) >> MM_PAGE_SHIFT].CacheDisable = 1;
+}
+#else
+VOID
+WinLdrpMapApic()
+{
+ /* Implement it for another arch */
+}
+#endif
+
+BOOLEAN
+WinLdrTurnOnPaging(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
+ ULONG PcrBasePage,
+ ULONG TssBasePage,
+ PVOID GdtIdt)
+{
+ ULONG i, PagesCount, MemoryMapSizeInPages;
+ ULONG LastPageIndex, LastPageType, MemoryMapStartPage;
+ PPAGE_LOOKUP_TABLE_ITEM MemoryMap;
+ ULONG NoEntries;
+ PKTSS Tss;
+ BOOLEAN Status;
+
+ //
+ // Creating a suitable memory map for the Windows can be tricky, so let's
+ // give a few advices:
+ // 1) One must not map the whole available memory pages to PDE!
+ // Map only what's needed - 16Mb, 24Mb, 32Mb max I think,
+ // thus occupying 4, 6 or 8 PDE entries for identical mapping,
+ // the same quantity for KSEG0_BASE mapping, one more entry for
+ // hyperspace and one more entry for HAL physical pages mapping.
+ // 2) Memory descriptors must map *the whole* physical memory
+ // showing any memory above 16/24/32 as FirmwareTemporary
+ //
+ // 3) Overall memory blocks count must not exceed 30 (?? why?)
+ //
+
+ //
+ // During MmInitMachineDependent, the kernel zeroes PDE at the following address
+ // 0xC0300000 - 0xC03007FC
+ //
+ // Then it finds the best place for non-paged pool:
+ // StartPde C0300F70, EndPde C0300FF8, NumberOfPages C13, NextPhysPage 3AD
+ //
+
+ // Before we start mapping pages, create a block of memory, which will contain
+ // PDE and PTEs
+ if (MempAllocatePageTables() == FALSE)
+ return FALSE;
+
+ // Allocate memory for memory allocation descriptors
+ Mad = MmHeapAlloc(sizeof(MEMORY_ALLOCATION_DESCRIPTOR) * 1024);
+
+ // Setup an entry for each descriptor
+ MemoryMap = MmGetMemoryMap(&NoEntries);
+ if (MemoryMap == NULL)
+ {
+ UiMessageBox("Can not retrieve the current memory map");
+ return FALSE;
+ }
+
+ // Calculate parameters of the memory map
+ MemoryMapStartPage = (ULONG_PTR)MemoryMap >> MM_PAGE_SHIFT;
+ MemoryMapSizeInPages = NoEntries * sizeof(PAGE_LOOKUP_TABLE_ITEM);
+
+ DPRINTM(DPRINT_WINDOWS, "Got memory map with %d entries\n", NoEntries);
+
+ // Always contigiously map low 1Mb of memory
+ Status = MempSetupPaging(0, 0x100);
+ if (!Status)
+ {
+ DPRINTM(DPRINT_WINDOWS, "Error during MempSetupPaging of low 1Mb\n");
+ return FALSE;
+ }
+
+ // Construct a good memory map from what we've got,
+ // but mark entries which the memory allocation bitmap takes
+ // as free entries (this is done in order to have the ability
+ // to place mem alloc bitmap outside lower 16Mb zone)
+ PagesCount = 1;
+ LastPageIndex = 0;
+ LastPageType = MemoryMap[0].PageAllocated;
+ for(i=1;i<NoEntries;i++)
+ {
+ // Check if its memory map itself
+ if (i >= MemoryMapStartPage &&
+ i < (MemoryMapStartPage+MemoryMapSizeInPages))
+ {
+ // Exclude it if current page belongs to the memory map
+ MemoryMap[i].PageAllocated = LoaderFree;
+ }
+
+ // Process entry
+ if (MemoryMap[i].PageAllocated == LastPageType &&
+ (i != NoEntries-1) )
+ {
+ PagesCount++;
+ }
+ else
+ {
+ // Add the resulting region
+ MempAddMemoryBlock(LoaderBlock, LastPageIndex, PagesCount, LastPageType);
+
+ // Reset our counter vars
+ LastPageIndex = i;
+ LastPageType = MemoryMap[i].PageAllocated;
+ PagesCount = 1;
+ }
+ }
+
+ // 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
+
+ DPRINTM(DPRINT_WINDOWS, "MadCount: %d\n", MadCount);
+
+ WinLdrpDumpMemoryDescriptors(LoaderBlock); //FIXME: Delete!
+
+ // Map our loader image, so we can continue running
+ /*Status = MempSetupPaging(OsLoaderBase >> MM_PAGE_SHIFT, OsLoaderSize >> MM_PAGE_SHIFT);
+ if (!Status)
+ {
+ UiMessageBox("Error during MempSetupPaging");
+ return;
+ }*/
+
+ //VideoDisplayString(L"Hello from VGA, going into the kernel\n");
+ DPRINTM(DPRINT_WINDOWS, "HalPageTable: 0x%X\n", HalPageTable);
+
+ // Page Tables have been setup, make special handling for PCR and TSS
+ // (which is done in BlSetupFotNt in usual ntldr)
+ HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage+1;
+ HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;
+ HalPageTable[(KI_USER_SHARED_DATA - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;
+
+ HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].PageFrameNumber = PcrBasePage;
+ HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Valid = 1;
+ HalPageTable[(KIP0PCRADDRESS - 0xFFC00000) >> MM_PAGE_SHIFT].Write = 1;
+
+ // Map APIC
+ WinLdrpMapApic();
+
+ // Map VGA memory
+ //VideoMemoryBase = MmMapIoSpace(0xb8000, 4000, MmNonCached);
+ //DPRINTM(DPRINT_WINDOWS, "VideoMemoryBase: 0x%X\n", VideoMemoryBase);
+
+ 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();
+ DPRINTM(DPRINT_WINDOWS, "Memory Descriptor List prepared, printing PDE\n");
+ List_PaToVa(&LoaderBlock->MemoryDescriptorListHead);
+
+#ifdef DBG
+ {
+ ULONG *PDE_Addr=(ULONG *)PDE;//0xC0300000;
+ int j;
+
+ DPRINTM(DPRINT_WINDOWS, "\nPDE\n");
+
+ for (i=0; i<128; i++)
+ {
+ DPRINTM(DPRINT_WINDOWS, "0x%04X | ", i*8);
+
+ for (j=0; j<8; j++)
+ {
+ DPRINTM(DPRINT_WINDOWS, "0x%08X ", PDE_Addr[i*8+j]);
+ }
+
+ DPRINTM(DPRINT_WINDOWS, "\n");
+ }
+ }
+#endif
+
+
+ // Enable paging
+ //BS->ExitBootServices(ImageHandle,MapKey);
+
+ // Disable Interrupts
+ _disable();
+
+ // Re-initalize EFLAGS
+ Ke386EraseFlags();
+
+ // Set the PDBR
+ __writecr3((ULONG_PTR)PDE);
+
+ // Enable paging by modifying CR0
+ __writecr0(__readcr0() | 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;
+
+ DPRINTM(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;
+
+ DPRINTM(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; //FIXME: Check this
+ 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 stuff (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;
+ 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
+ //
+
+ // 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
+ */
+}
projects / reactos.git / blobdiff