[fireball] 25103: - MM: Don't place memory allocation bitmap right into the first 16Mb of memory - revert back to the old algorithm, which places it as high as possible - MM: Mark space under the mem alloc bitmap as free right before going to virtual mode, thus it doesn't get mapped - Save NT version which user wants to boot in the extension

Author: fireball
Date: Sat Dec  9 19:54:37 2006
New Revision: 25103

URL: http://svn.reactos.org/svn/reactos?rev=25103&view=rev
Log:
- MM: Don't place memory allocation bitmap right into the first 16Mb of memory -
revert back to the old algorithm, which places it as high as possible
- MM: Mark space under the mem alloc bitmap as free right before going to virtual mode,
thus it doesn't get mapped
- Save NT version which user wants to boot in the extension

Modified:
    branches/winldr/mm/meminit.c
    branches/winldr/mm/mm.c
    branches/winldr/windows/winldr.c
    branches/winldr/windows/wlmemory.c

Modified: branches/winldr/mm/meminit.c
URL:
http://svn.reactos.org/svn/reactos/branches/winldr/mm/meminit.c?rev=25103&a…
==============================================================================
--- branches/winldr/mm/meminit.c (original)
+++ branches/winldr/mm/meminit.c Sat Dec  9 19:54:37 2006
@@ -1,6 +1,7 @@
 /*
  *  FreeLoader
- *  Copyright (C) 1998-2003  Brian Palmer  <brianp(a)sginet.com>
+ *  Copyright (C) 1998-2003  Brian Palmer    <brianp(a)sginet.com>
+ *  Copyright (C) 2006       Aleksey Bragin  <aleksey(a)reactos.org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -211,47 +212,22 @@
 	RtlCopyMemory(TempBiosMemoryMap, BiosMemoryMap, sizeof(BIOS_MEMORY_MAP) * 32);
 	MmSortBiosMemoryMap(TempBiosMemoryMap, MapCount);
 
-	for (Index=0; Index<MapCount; Index++)
+	// Find a place, starting from the highest memory
+	// (thus leaving low memory for kernel/drivers)
+	for (Index=(MapCount-1); Index>=0; Index--)
 	{
 		// If this is usable memory with a big enough length
 		// then we'll put our page lookup table here
-
-		// place it somewhere @ 10Mb if possible
-		// (afaik no bad things are placed at 10Mb, if there are
-		//  - we just fallback to the usual algo)
 
 		// skip if this is not usable region
 		if (TempBiosMemoryMap[Index].Type != BiosMemoryUsable)
 			continue;
 
-		if (TempBiosMemoryMap[Index].BaseAddress <= 10 * 0x100000 &&
-		    TempBiosMemoryMap[Index].BaseAddress + TempBiosMemoryMap[Index].Length >=
-		        10 * 0x100000 + PageLookupTableSize)
-		{
-			PageLookupTableMemAddress = (PVOID)(10 * 0x100000);
+		if (TempBiosMemoryMap[Index].Length >= PageLookupTableSize)
+		{
+			PageLookupTableMemAddress = (PVOID)(ULONG)
+				(TempBiosMemoryMap[Index].BaseAddress + (TempBiosMemoryMap[Index].Length -
PageLookupTableSize));
 			break;
-		}
-	}
-
-	// Check if we found a suitable place
-	if (PageLookupTableMemAddress == 0)
-	{
-		// no, let's do a traditional algorithm instead
-		for (Index=(MapCount-1); Index>=0; Index--)
-		{
-			// If this is usable memory with a big enough length
-			// then we'll put our page lookup table here
-
-			// skip if this is not usable region
-			if (TempBiosMemoryMap[Index].Type != BiosMemoryUsable)
-				continue;
-
-			if (TempBiosMemoryMap[Index].Length >= PageLookupTableSize)
-			{
-				PageLookupTableMemAddress = (PVOID)(ULONG)
-					(TempBiosMemoryMap[Index].BaseAddress + (TempBiosMemoryMap[Index].Length -
PageLookupTableSize));
-				break;
-			}
 		}
 	}
 

Modified: branches/winldr/mm/mm.c
URL:
http://svn.reactos.org/svn/reactos/branches/winldr/mm/mm.c?rev=25103&r1…
==============================================================================
--- branches/winldr/mm/mm.c (original)
+++ branches/winldr/mm/mm.c Sat Dec  9 19:54:37 2006
@@ -1,6 +1,7 @@
 /*
  *  FreeLoader
- *  Copyright (C) 1998-2003  Brian Palmer  &lt;brianp(a)sginet.com&gt;
+ *  Copyright (C) 1998-2003  Brian Palmer    &lt;brianp(a)sginet.com&gt;
+ *  Copyright (C) 2006       Aleksey Bragin  &lt;aleksey(a)reactos.org&gt;
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by

Modified: branches/winldr/windows/winldr.c
URL:
http://svn.reactos.org/svn/reactos/branches/winldr/windows/winldr.c?rev=251…
==============================================================================
--- branches/winldr/windows/winldr.c (original)
+++ branches/winldr/windows/winldr.c Sat Dec  9 19:54:37 2006
@@ -77,7 +77,8 @@
 VOID
 WinLdrInitializePhase1(PLOADER_PARAMETER_BLOCK LoaderBlock,
                        PCHAR Options,
-                       PCHAR SystemPath)
+                       PCHAR SystemPath,
+                       WORD VersionToBoot)
 {
 	/* Examples of correct options and paths */
 	//CHAR	Options[] = "/DEBUGPORT=COM1 /BAUDRATE=115200";
@@ -187,9 +188,10 @@
 	}
 	RtlZeroMemory(Extension, sizeof(LOADER_PARAMETER_EXTENSION));
 
+	/* Save size and version information */
 	Extension->Size = sizeof(LOADER_PARAMETER_EXTENSION);
-	Extension->MajorVersion = 4;
-	Extension->MinorVersion = 0;
+	Extension->MajorVersion = (VersionToBoot & 0xFF00) >> 8;
+	Extension->MinorVersion = VersionToBoot & 0xFF;
 
 
 	LoaderBlock->Extension = PaToVa(Extension);
@@ -449,7 +451,7 @@
 	DbgPrint((DPRINT_WINDOWS, "HAL loaded with status %d at %p\n", Status,
HalBase));
 
 	/* Load kernel-debugger support dll */
-	if (OperatingSystemVersion > _WIN32_WINNT_NT4)
+	if (OperatingSystemVersion > _WIN32_WINNT_WIN2K)
 	{
 		strcpy(FileName, BootPath);
 		strcat(FileName, "SYSTEM32\\KDCOM.DLL");
@@ -462,7 +464,7 @@
 		"WINNT\\SYSTEM32\\NTOSKRNL.EXE", NtosBase, &KernelDTE);
 	WinLdrAllocateDataTableEntry(LoaderBlock, "hal.dll",
 		"WINNT\\SYSTEM32\\HAL.DLL", HalBase, &HalDTE);
-	if (OperatingSystemVersion > _WIN32_WINNT_NT4)
+	if (OperatingSystemVersion > _WIN32_WINNT_WIN2K)
 	{
 		WinLdrAllocateDataTableEntry(LoaderBlock, "kdcom.dll",
 			"WINNT\\SYSTEM32\\KDCOM.DLL", KdComBase, &KdComDTE);
@@ -485,7 +487,7 @@
 	DbgPrint((DPRINT_WINDOWS, "Boot drivers loaded with status %d\n", Status));
 
 	/* Initialize Phase 1 - no drivers loading anymore */
-	WinLdrInitializePhase1(LoaderBlock, BootOptions, SystemPath);
+	WinLdrInitializePhase1(LoaderBlock, BootOptions, SystemPath, OperatingSystemVersion);
 
 	/* Alloc PCR, TSS, do magic things with the GDT/IDT */
 	WinLdrSetupForNt(LoaderBlock, &GdtIdt, &PcrBasePage, &TssBasePage);
@@ -507,9 +509,9 @@
 	DbgPrint((DPRINT_WINDOWS, "Hello from paged mode, KiSystemStartup %p, LoaderBlockVA
%p!\n",
 		KiSystemStartup, LoaderBlockVA));
 
-	//WinLdrpDumpMemoryDescriptors(LoaderBlockVA);
-	//WinLdrpDumpBootDriver(LoaderBlockVA);
-	//WinLdrpDumpArcDisks(LoaderBlockVA);
+	WinLdrpDumpMemoryDescriptors(LoaderBlockVA);
+	WinLdrpDumpBootDriver(LoaderBlockVA);
+	WinLdrpDumpArcDisks(LoaderBlockVA);
 
 	//FIXME: If I substitute this debugging checkpoint, GCC will "optimize away"
the code below
 	//while (1) {};

Modified: branches/winldr/windows/wlmemory.c
URL:
http://svn.reactos.org/svn/reactos/branches/winldr/windows/wlmemory.c?rev=2…
==============================================================================
--- branches/winldr/windows/wlmemory.c (original)
+++ branches/winldr/windows/wlmemory.c Sat Dec  9 19:54:37 2006
@@ -336,8 +336,8 @@
                    ULONG TssBasePage,
                    PVOID GdtIdt)
 {
-	ULONG i, PagesCount;
-	ULONG LastPageIndex, LastPageType;
+	ULONG i, PagesCount, MemoryMapSizeInPages;
+	ULONG LastPageIndex, LastPageType, MemoryMapStartPage;
 	PPAGE_LOOKUP_TABLE_ITEM MemoryMap;
 	ULONG NoEntries;
 	PKTSS Tss;
@@ -378,6 +378,10 @@
 		return FALSE;
 	}
 
+	// Calculate parameters of the memory map
+	MemoryMapStartPage = (ULONG_PTR)MemoryMap >> MM_PAGE_SHIFT;
+	MemoryMapSizeInPages = NoEntries * sizeof(PAGE_LOOKUP_TABLE_ITEM);
+
 	DbgPrint((DPRINT_WINDOWS, "Got memory map with %d entries\n", NoEntries));
 
 	// Always contigiously map low 1Mb of memory
@@ -388,12 +392,24 @@
 		return FALSE;
 	}
 
-	// Construct a good memory map from what we've got
+	// 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) )
 		{