160 lines
2.5 KiB
C
160 lines
2.5 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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bdreboot.c
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Abstract:
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System reboot function. Currently part of the debugger because
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that's the only place it's used.
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Author:
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Bryan M. Willman (bryanwi) 4-Dec-90
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Revision History:
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--*/
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#include "bd.h"
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VOID
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FwStallExecution(
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IN ULONG Microseconds
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);
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#define CMOS_CTRL (PUCHAR )0x70
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#define CMOS_DATA (PUCHAR )0x71
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#define RESET 0xfe
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#define KEYBPORT (PUCHAR )0x64
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VOID
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HalpReboot (
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VOID
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)
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/*++
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Routine Description:
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This procedure resets the CMOS clock to the standard timer settings
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so the bios will work, and then issues a reset command to the keyboard
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to cause a warm boot.
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It is very machine dependent, this implementation is intended for
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PC-AT like machines.
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This code copied from the "old debugger" sources.
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N.B.
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Will NOT return.
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--*/
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{
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UCHAR Scratch;
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PUSHORT Magic;
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//
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// Turn off interrupts
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//
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_asm {
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cli
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}
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//
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// Reset the cmos clock to a standard value
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// (We are setting the periodic interrupt control on the MC147818)
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//
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//
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// Disable periodic interrupt
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//
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WRITE_PORT_UCHAR(CMOS_CTRL, 0x0b); // Set up for control reg B.
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FwStallExecution(1);
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Scratch = READ_PORT_UCHAR(CMOS_DATA);
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FwStallExecution(1);
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Scratch &= 0xbf; // Clear periodic interrupt enable
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WRITE_PORT_UCHAR(CMOS_DATA, Scratch);
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FwStallExecution(1);
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//
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// Set "standard" divider rate
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//
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WRITE_PORT_UCHAR(CMOS_CTRL, 0x0a); // Set up for control reg A.
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FwStallExecution(1);
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Scratch = READ_PORT_UCHAR(CMOS_DATA);
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FwStallExecution(1);
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Scratch &= 0xf0; // Clear rate setting
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Scratch |= 6; // Set default rate and divider
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WRITE_PORT_UCHAR(CMOS_DATA, Scratch);
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FwStallExecution(1);
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//
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// Set a "neutral" cmos address to prevent weirdness
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// (Why is this needed? Source this was copied from doesn't say)
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//
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WRITE_PORT_UCHAR(CMOS_CTRL, 0x15);
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FwStallExecution(1);
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//
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// If we return, send the reset command to the keyboard controller
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//
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WRITE_PORT_UCHAR(KEYBPORT, RESET);
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_asm {
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hlt
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}
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}
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VOID
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BdReboot (
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VOID
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)
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/*++
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Routine Description:
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Just calls the HalReturnToFirmware function.
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Arguments:
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None
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Return Value:
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Does not return
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--*/
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{
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//
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// Never returns from HAL
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//
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HalpReboot();
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while (TRUE) {
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}
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}
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