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561 lines
13 KiB
561 lines
13 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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main.c
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Abstract:
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Main for the SU (startup) module for the OS loader. The SU module
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must take the x86 from a real-mode 16bit state to a FLAT model,
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32bit protect/paging enabled state.
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Author:
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Thomas Parslow (tomp) Created 20-Dec-90
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Revision History:
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--*/
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#define NTAPI
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#include "su.h"
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#include "eisa.h"
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#define _SYS_GUID_OPERATORS_
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#include <guiddef.h>
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#include "ntimage.h"
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#include "strings.h"
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extern VOID RealMode(VOID);
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extern USHORT IDTregisterZero;
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extern IMAGE_DOS_HEADER edata;
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extern USHORT end;
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extern VOID MoveMemory(ULONG,ULONG,ULONG);
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extern USHORT SuStackBegin;
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extern UCHAR Beginx86Relocation;
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extern UCHAR Endx86Relocation;
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extern USHORT BackEnd;
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extern ULONG FileStart;
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extern BOOLEAN IsNpxPresent(VOID);
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extern USHORT HwGetProcessorType(VOID);
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extern USHORT HwGetCpuStepping(USHORT);
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extern ULONG MachineType;
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extern ULONG OsLoaderStart;
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extern ULONG OsLoaderEnd;
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extern ULONG ResourceDirectory;
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extern ULONG ResourceOffset;
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extern ULONG OsLoaderBase;
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extern ULONG OsLoaderExports;
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extern
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TurnMotorOff(
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VOID
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);
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extern
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EnableA20(
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VOID
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);
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extern
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BOOLEAN
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ConstructMemoryDescriptors(
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VOID
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);
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extern
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USHORT
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IsaConstructMemoryDescriptors(
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VOID
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);
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VOID
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Relocatex86Structures(
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VOID
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);
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ULONG
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RelocateLoaderSections(
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OUT PULONG Start,
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OUT PULONG End
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);
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extern
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FSCONTEXT_RECORD
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FsContext;
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#define DISK_TABLE_VECTOR (0x1e*4)
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FPULONG DiskTableVector = (FPULONG)(DISK_TABLE_VECTOR);
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VOID
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SuMain(
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IN UCHAR BtBootDrive
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)
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/*++
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Routine Description:
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Main entrypoint of the SU module. Control is passed from the boot
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sector to startup.asm which does some run-time fixups on the stack
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and data segments and then passes control here.
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Arguments:
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BtBootDrive - Drive that we booted from (int13 unit number)
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Returns:
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Does not return. Passes control to the OS loader
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--*/
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{
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ULONG LoaderEntryPoint;
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ULONG EisaNumPages;
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USHORT IsaNumPages;
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MEMORY_LIST_ENTRY _far *CurrentEntry;
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PIMAGE_OPTIONAL_HEADER OptionalHeader;
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ULONG BlockEnd;
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ULONG ImageSize;
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ULONG ImageBase;
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//
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// Save fs context info
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//
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FsContext.BootDrive = BtBootDrive;
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//
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// Initialize the video subsystem first so that
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// errors end exceptions can be displayed.
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//
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InitializeVideoSubSystem();
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//
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// In case we booted from a floppy, turn the drive motor off.
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//
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TurnMotorOff();
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//
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// Set up machine type based on its Bus type.
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//
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if (BtIsEisaSystem()) {
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MachineType = MACHINE_TYPE_EISA;
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} else {
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MachineType = MACHINE_TYPE_ISA;
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}
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if (!ConstructMemoryDescriptors()) {
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//
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// If INT 15 E802h fails...
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//
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if (MachineType == MACHINE_TYPE_EISA) {
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//
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// HACKHACK John Vert (jvert)
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// This is completely bogus. Since there are a number of EISA
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// machines which do not let you correctly configure the EISA
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// NVRAM, and even MORE machines which are improperly configured,
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// we first check to see how much memory the ISA routines say
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// exists. Then we check what the EISA routines tell us, and
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// compare the two. If the EISA number is much lower (where "much"
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// is a completely random fudge factor) than the ISA number, we
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// assume the machine is improperly configured and we throw away
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// the EISA numbers and use the ISA ones. If not, we assume that
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// the machine is actually configured properly and we trust the
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// EISA numbers..
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//
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IsaNumPages = IsaConstructMemoryDescriptors();
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EisaNumPages = EisaConstructMemoryDescriptors();
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if (EisaNumPages + 0x80 < IsaNumPages) {
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IsaConstructMemoryDescriptors();
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}
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} else {
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IsaConstructMemoryDescriptors();
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}
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}
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//
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// Search for memory descriptor describing low memory
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//
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CurrentEntry = MemoryDescriptorList;
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while ((CurrentEntry->BlockBase != 0) &&
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(CurrentEntry->BlockSize != 0)) {
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CurrentEntry++;
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}
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if ((CurrentEntry->BlockBase == 0) &&
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(CurrentEntry->BlockSize < (ULONG)512 * (ULONG)1024)) {
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BlPrint(SU_NO_LOW_MEMORY,CurrentEntry->BlockSize/1024);
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while (1) {
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}
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}
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//
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// Ensure there is a memory descriptor to contain osloader image
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//
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OptionalHeader = &((PIMAGE_NT_HEADERS) ((PUCHAR) &edata + edata.e_lfanew))->OptionalHeader;
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ImageBase = OptionalHeader->ImageBase;
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ImageSize = OptionalHeader->SizeOfImage;
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OsLoaderBase = ImageBase;
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OsLoaderExports = ImageBase + OptionalHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
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CurrentEntry = MemoryDescriptorList;
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while (ImageSize > 0) {
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while (CurrentEntry->BlockSize != 0) {
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BlockEnd = CurrentEntry->BlockBase + CurrentEntry->BlockSize;
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if ((CurrentEntry->BlockBase <= ImageBase) &&
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(BlockEnd > ImageBase)) {
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//
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// this descriptor at least partially contains a chunk
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// of the osloader.
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//
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if (BlockEnd-ImageBase > ImageSize) {
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ImageSize = 0;
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} else {
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ImageSize -= (BlockEnd-ImageBase);
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ImageBase = BlockEnd;
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}
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//
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// look for remaining part (if any) of osloader
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//
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CurrentEntry = MemoryDescriptorList;
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break;
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}
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CurrentEntry++;
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}
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if (CurrentEntry->BlockSize == 0) {
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break;
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}
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}
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if (ImageSize > 0) {
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//
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// We could not relocate the osloader to high memory. Error out
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// and display the memory map.
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//
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BlPrint(SU_NO_EXTENDED_MEMORY);
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CurrentEntry = MemoryDescriptorList;
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while (CurrentEntry->BlockSize != 0) {
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BlPrint(" %lx - %lx\n",
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CurrentEntry->BlockBase,
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CurrentEntry->BlockBase + CurrentEntry->BlockSize);
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CurrentEntry++;
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}
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while (1) {
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}
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}
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//
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// Enable the A20 line for protect mode
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//
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EnableA20();
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//
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// Relocate x86 structures. This includes the GDT, IDT,
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// page directory, and first level page table.
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//
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Relocatex86Structures();
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//
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// Enable protect and paging modes for the first time
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//
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EnableProtectPaging(ENABLING);
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//
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// Go relocate loader sections and build page table entries
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//
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LoaderEntryPoint = RelocateLoaderSections(&OsLoaderStart, &OsLoaderEnd);
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//
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// Search for memory descriptor containing the osloader and
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// change it.
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//
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//
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// Transfer control to the OS loader
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//
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TransferToLoader(LoaderEntryPoint);
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}
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ULONG
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RelocateLoaderSections(
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OUT PULONG Start,
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OUT PULONG End
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)
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/*++
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Routine Description:
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The SU module is prepended to the OS loader file. The OS loader file
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is a coff++ file. This routine computes the beginning of the OS loader
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file, then relocates the OS loader's sections as if it were just
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loading the file from disk file.
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Arguments:
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Start - Returns the address of the start of the image
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End - Returns the address of the end of the image
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Returns:
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Entry point of loader
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--*/
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{
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USHORT Section;
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ULONG Source,Destination;
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ULONG VirtualSize;
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ULONG SizeOfRawData;
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PIMAGE_FILE_HEADER FileHeader;
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PIMAGE_OPTIONAL_HEADER OptionalHeader;
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PIMAGE_SECTION_HEADER SectionHeader;
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//
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// Make a pointer to the beginning of the loader's coff header
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//
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FileHeader = &((PIMAGE_NT_HEADERS) ((PUCHAR) &edata + edata.e_lfanew))->FileHeader;
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//
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// Validate the appended loader image by checking signatures.
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// 1st - is it an executable image?
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// 2nd - is the target environment the 386?
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//
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if ((FileHeader->Characteristics & IMAGE_FILE_EXECUTABLE_IMAGE) == 0) {
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puts(SU_NTLDR_CORRUPT);
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WAITFOREVER;
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}
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if (FileHeader->Machine != IMAGE_FILE_MACHINE_I386) {
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puts(SU_NTLDR_CORRUPT);
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WAITFOREVER;
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}
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//
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// Make a pointer to the optional header in the header-buffer
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//
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OptionalHeader = (PIMAGE_OPTIONAL_HEADER)((PUCHAR)FileHeader +
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sizeof(IMAGE_FILE_HEADER));
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//
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// Make a pointer to the first section in the header buffer
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//
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SectionHeader = (PIMAGE_SECTION_HEADER)((PUCHAR)OptionalHeader +
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FileHeader->SizeOfOptionalHeader);
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*Start = OptionalHeader->ImageBase+SectionHeader->VirtualAddress;
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*End = *Start + SectionHeader->SizeOfRawData;
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//
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// Display some debug stuff for now
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//
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DBG1(
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BlPrint("Machine = %x\n",FileHeader->Machine);
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BlPrint("NumberOfSections = %x\n",FileHeader->NumberOfSections);
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BlPrint("TimeDateStamp %lx\n",FileHeader->TimeDateStamp);
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BlPrint("PointerToSymbolTable = %lx\n",FileHeader->PointerToSymbolTable);
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BlPrint("NumberOfSymbols %lx\n",FileHeader->NumberOfSymbols);
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BlPrint("SizeOfOptionalHeader = %x\n",FileHeader->SizeOfOptionalHeader);
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BlPrint("Characteristics = %x\n",FileHeader->Characteristics);
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)
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//
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// Loop and relocate each section with a non-zero RawData size
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//
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for (Section=FileHeader->NumberOfSections ; Section-- ; SectionHeader++) {
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//
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// Compute source, destination, and count arguments
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//
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Source = FileStart + SectionHeader->PointerToRawData;
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Destination = OptionalHeader->ImageBase + SectionHeader->VirtualAddress;
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VirtualSize = SectionHeader->Misc.VirtualSize;
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SizeOfRawData = SectionHeader->SizeOfRawData;
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if (VirtualSize == 0) {
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VirtualSize = SizeOfRawData;
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}
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if (SectionHeader->PointerToRawData == 0) {
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//
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// SizeOfRawData can be non-zero even if PointerToRawData is zero
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//
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SizeOfRawData = 0;
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} else if (SizeOfRawData > VirtualSize) {
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//
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// Don't load more from image than is expected in memory
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//
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SizeOfRawData = VirtualSize;
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}
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if (Destination < *Start) {
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*Start = Destination;
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}
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if (Destination+VirtualSize > *End) {
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*End = Destination+VirtualSize;
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}
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DBG1(BlPrint("src=%lx dest=%lx raw=%lx\n",Source,Destination,SizeOfRawData);)
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if (SizeOfRawData != 0) {
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//
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// This section is either a code (.TEXT) section or an
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// initialized data (.DATA) section.
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// Relocate the section to memory at the virtual/physical
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// addresses specified in the section header.
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//
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MoveMemory(Source,Destination,SizeOfRawData);
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}
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if (SizeOfRawData < VirtualSize) {
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//
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// Zero the portion not loaded from the image
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//
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DBG1( BlPrint("Zeroing destination %lx\n",Destination+SizeOfRawData); )
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ZeroMemory(Destination+SizeOfRawData,VirtualSize - SizeOfRawData);
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}
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//
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// Check if this is the resource section. If so, we need
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// to pass its location to the osloader.
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//
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if ((SectionHeader->Name[0] == '.') &&
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(SectionHeader->Name[1] == 'r') &&
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(SectionHeader->Name[2] == 's') &&
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(SectionHeader->Name[3] == 'r') &&
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(SectionHeader->Name[4] == 'c')) {
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ResourceDirectory = Destination;
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ResourceOffset = SectionHeader->VirtualAddress;
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}
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}
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DBG1( BlPrint("RelocateLoaderSections done - EntryPoint == %lx\n",
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OptionalHeader->AddressOfEntryPoint + OptionalHeader->ImageBase);)
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return(OptionalHeader->AddressOfEntryPoint + OptionalHeader->ImageBase);
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}
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VOID
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Relocatex86Structures(
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VOID
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)
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/*++
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Routine Description:
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The gdt and idt are statically defined and imbedded in the SU modules
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data segment. This routine moves then out of the data segment and into
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a page mapped at a defined location.
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Arguments:
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None
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Returns:
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Nothing
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--*/
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{
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FPUCHAR Fpsrc, Fpdst;
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USHORT Count;
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//
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// Make pointers to the data and compute the size
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// of the block to use.
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//
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Fpsrc = (FPUCHAR)&Beginx86Relocation;
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MAKE_FP(Fpdst,SYSTEM_STRUCTS_BASE_PA);
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Count = (&Endx86Relocation - &Beginx86Relocation);
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//
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// Move the data to its new location
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//
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while (Count--) {
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*Fpdst++ = *Fpsrc++;
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}
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}
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VOID
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DisplayArgs(
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USHORT es,
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USHORT bx,
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USHORT cx,
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USHORT dx,
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USHORT ax
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)
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/*++
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Routine Description:
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Just a debugging routine to dump some registers.
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Arguments:
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The x86 registers es, bx, cx, dx, and ax are pushed on the stack
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before this routine is called.
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Returns:
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Nothing
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Environment:
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Real Mode ONLY
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--*/
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{
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BlPrint("ax:%x dx:%x cx:%x bx:%x es:%x\n",
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(USHORT) ax,
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(USHORT) dx,
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(USHORT) cx,
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(USHORT) bx,
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(USHORT) es);
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return;
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}
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// END OF FILE //
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