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189 lines
4.9 KiB
189 lines
4.9 KiB
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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init.c
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Abstract:
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This module implements the initialization for the boot debgger.
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Author:
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David N. Cutler (davec) 27-Nov-1996
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Revision History:
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--*/
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#include "bd.h"
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#if defined(EFI)
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#include "bootefi.h"
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#endif
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//
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// Define local data.
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//
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#define BAUD_OPTION "BAUDRATE"
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#define PORT_OPTION "DEBUGPORT"
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ULONG BdFileId;
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VOID
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BdInitDebugger (
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IN PCHAR LoaderName,
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IN PVOID LoaderBase,
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IN PCHAR Options
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)
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/*++
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Routine Description:
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This routine initializes the boot kernel debugger.
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Arguments:
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Options - Supplies a pointer to the the boot options.
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Stop - Supplies a logical value that determines whether a debug message
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and breakpoint are generated.
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Return Value:
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None.
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--*/
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{
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PCHAR BaudOption;
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ULONG BaudRate;
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ULONG Index;
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ULONG PortNumber;
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PCHAR PortOption;
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STRING String;
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//
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// If the boot debugger is not already initialized, then attempt to
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// initialize the debugger.
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//
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if (BdDebuggerEnabled == FALSE) {
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//
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// Set the address of the debug routine to the stub function and parse
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// any options if specified.
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//
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BdDebugRoutine = BdStub;
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if (Options != NULL) {
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_strupr(Options);
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//
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// If nodebug is not explicitly specified, then check if the baud
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// rate, com port, or debug is explicitly specified.
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//
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if (strstr(Options, "NODEBUG") == NULL) {
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PortNumber = 0;
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PortOption = strstr(Options, PORT_OPTION);
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BaudOption = strstr(Options, BAUD_OPTION);
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BaudRate = 0;
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if ((PortOption == NULL) && (BaudOption == NULL)) {
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if (strstr(Options, "DEBUG") == NULL) {
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return;
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}
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} else {
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if (PortOption != NULL) {
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PortOption = strstr(PortOption, "COM");
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if (PortOption != NULL) {
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PortNumber = atol(PortOption + 3);
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}
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}
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if (BaudOption != NULL) {
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BaudOption += strlen(BAUD_OPTION);
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while (*BaudOption == ' ') {
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BaudOption++;
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}
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if (*BaudOption != '\0') {
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BaudRate = atol(BaudOption + 1);
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}
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}
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}
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//
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// Attempt to initialize the debug port.
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//
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if (BdPortInitialize(BaudRate, PortNumber, &BdFileId) == FALSE) {
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return;
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}
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//
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// Set the value of a break point instruction, set the address
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// of the debug routine to the trap function, set the debugger
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// enabled and initialize the breakpoint table.
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//
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BdBreakpointInstruction = BD_BREAKPOINT_VALUE;
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BdDebugRoutine = BdTrap;
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BdDebuggerEnabled = TRUE;
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for (Index = 0; Index < BREAKPOINT_TABLE_SIZE; Index += 1) {
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BdBreakpointTable[Index].Flags = 0;
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BdBreakpointTable[Index].Address = 0;
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}
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//
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// Initialize the ID for the NEXT packet to send and the Expect
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// ID of next incoming packet.
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//
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BdNextPacketIdToSend = INITIAL_PACKET_ID | SYNC_PACKET_ID;
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BdPacketIdExpected = INITIAL_PACKET_ID;
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//
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// Announce debugger initialized.
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//
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DbgPrint("BD: Boot Debugger Initialized\n");
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//
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// Notify the kernel debugger to load symbols for the loader.
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//
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String.Buffer = LoaderName;
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String.Length = (USHORT) strlen(LoaderName);
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DbgPrint("BD: %s base address %p\n", LoaderName, LoaderBase);
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DbgLoadImageSymbols(&String, LoaderBase, (ULONG_PTR)-1);
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if (strstr(Options, "DEBUGSTOP") != NULL) {
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//
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// Treat this like a request for initial breakpoint.
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//
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DbgBreakPoint();
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}
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#if defined(EFI)
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//
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// if running under the debugger disable the watchdog so we
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// don't get reset
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//
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DisableEFIWatchDog();
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#endif
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}
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}
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}
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return;
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}
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