mirror of https://github.com/lianthony/NT4.0
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
2.7 KiB
143 lines
2.7 KiB
/*++
|
|
|
|
Copyright (c) 1991 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
ixreboot.c
|
|
|
|
Abstract:
|
|
|
|
Provides the interface to the firmware for x86. Since there is no
|
|
firmware to speak of on x86, this is just reboot support.
|
|
|
|
Author:
|
|
|
|
John Vert (jvert) 12-Aug-1991
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
#include "halp.h"
|
|
|
|
//
|
|
// Defines to let us diddle the CMOS clock and the keyboard
|
|
//
|
|
|
|
#define CMOS_CTRL (PUCHAR )0x70
|
|
#define CMOS_DATA (PUCHAR )0x71
|
|
|
|
#define RESET 0xfe
|
|
#define KEYBPORT (PUCHAR )0x64
|
|
|
|
//
|
|
// Private function prototypes
|
|
//
|
|
|
|
VOID
|
|
HalpReboot (
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
HalpReboot (
|
|
VOID
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This procedure resets the CMOS clock to the standard timer settings
|
|
so the bios will work, and then issues a reset command to the keyboard
|
|
to cause a warm boot.
|
|
|
|
It is very machine dependent, this implementation is intended for
|
|
PC-AT like machines.
|
|
|
|
This code copied from the "old debugger" sources.
|
|
|
|
N.B.
|
|
|
|
Will NOT return.
|
|
|
|
--*/
|
|
|
|
{
|
|
UCHAR Scratch;
|
|
PUSHORT Magic;
|
|
|
|
//
|
|
// By sticking 0x1234 at physical location 0x472, we can bypass the
|
|
// memory check after a reboot.
|
|
//
|
|
|
|
Magic = HalpMapPhysicalMemory(0, 1);
|
|
Magic[0x472 / sizeof(USHORT)] = 0x1234;
|
|
|
|
//
|
|
// Turn off interrupts
|
|
//
|
|
|
|
HalpAcquireCmosSpinLock();
|
|
|
|
_asm {
|
|
cli
|
|
}
|
|
|
|
//
|
|
// Reset the cmos clock to a standard value
|
|
// (We are setting the periodic interrupt control on the MC147818)
|
|
//
|
|
|
|
//
|
|
// Disable periodic interrupt
|
|
//
|
|
|
|
WRITE_PORT_UCHAR(CMOS_CTRL, 0x0b); // Set up for control reg B.
|
|
KeStallExecutionProcessor(1);
|
|
|
|
Scratch = READ_PORT_UCHAR(CMOS_DATA);
|
|
KeStallExecutionProcessor(1);
|
|
|
|
Scratch &= 0xbf; // Clear periodic interrupt enable
|
|
|
|
WRITE_PORT_UCHAR(CMOS_DATA, Scratch);
|
|
KeStallExecutionProcessor(1);
|
|
|
|
//
|
|
// Set "standard" divider rate
|
|
//
|
|
|
|
WRITE_PORT_UCHAR(CMOS_CTRL, 0x0a); // Set up for control reg A.
|
|
KeStallExecutionProcessor(1);
|
|
|
|
Scratch = READ_PORT_UCHAR(CMOS_DATA);
|
|
KeStallExecutionProcessor(1);
|
|
|
|
Scratch &= 0xf0; // Clear rate setting
|
|
Scratch |= 6; // Set default rate and divider
|
|
|
|
WRITE_PORT_UCHAR(CMOS_DATA, Scratch);
|
|
KeStallExecutionProcessor(1);
|
|
|
|
//
|
|
// Set a "neutral" cmos address to prevent weirdness
|
|
// (Why is this needed? Source this was copied from doesn't say)
|
|
//
|
|
|
|
WRITE_PORT_UCHAR(CMOS_CTRL, 0x15);
|
|
KeStallExecutionProcessor(1);
|
|
|
|
HalpResetAllProcessors();
|
|
|
|
//
|
|
// If we return, send the reset command to the keyboard controller
|
|
//
|
|
|
|
WRITE_PORT_UCHAR(KEYBPORT, RESET);
|
|
|
|
_asm {
|
|
hlt
|
|
}
|
|
}
|