237 lines
4.7 KiB
C
237 lines
4.7 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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ixreboot.c
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Abstract:
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Provides the interface to the firmware for x86. Since there is no
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firmware to speak of on x86, this is just reboot support.
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Author:
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John Vert (jvert) 12-Aug-1991
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Revision History:
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--*/
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//
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// This module is compatible with PAE mode and therefore treats physical
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// addresses as 64-bit entities.
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//
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#if !defined(_PHYS64_)
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#define _PHYS64_
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#endif
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#include "halp.h"
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#include "pci.h"
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#ifdef ACPI_HAL
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#include "acpitabl.h"
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#include "xxacpi.h"
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extern UCHAR HalpPiix4;
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#endif
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//
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// Defines to let us diddle the CMOS clock and the keyboard
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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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//
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// Private function prototypes
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//
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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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PUCHAR ResetAddress;
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PHYSICAL_ADDRESS zeroPhysical;
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PCI_SLOT_NUMBER slot;
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//
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// By sticking 0x1234 at physical location 0x472, we can bypass the
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// memory check after a reboot.
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//
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zeroPhysical.QuadPart = 0;
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Magic = HalpMapPhysicalMemory(zeroPhysical, 1);
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if (Magic) {
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Magic[0x472 / sizeof(USHORT)] = 0x1234;
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}
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//
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// Turn off interrupts
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//
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HalpAcquireCmosSpinLock();
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HalpDisableInterrupts();
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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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KeStallExecutionProcessor(1);
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Scratch = READ_PORT_UCHAR(CMOS_DATA);
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KeStallExecutionProcessor(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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KeStallExecutionProcessor(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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KeStallExecutionProcessor(1);
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Scratch = READ_PORT_UCHAR(CMOS_DATA);
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KeStallExecutionProcessor(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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KeStallExecutionProcessor(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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KeStallExecutionProcessor(1);
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HalpResetAllProcessors();
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#ifdef ACPI_HAL
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if ((HalpFixedAcpiDescTable.Header.Revision > 1) &&
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(HalpFixedAcpiDescTable.flags & RESET_CAP)) {
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switch (HalpFixedAcpiDescTable.reset_reg.AddressSpaceID) {
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case 0: // Memory
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ResetAddress =
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HalpMapPhysicalMemory(HalpFixedAcpiDescTable.reset_reg.Address, 1);
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WRITE_REGISTER_UCHAR(ResetAddress,
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HalpFixedAcpiDescTable.reset_val);
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break;
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case 1: // I/O
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WRITE_PORT_UCHAR((PUCHAR)(ULONG_PTR)HalpFixedAcpiDescTable.reset_reg.Address.LowPart,
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HalpFixedAcpiDescTable.reset_val);
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break;
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case 2: // PCI Config
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slot.u.AsULONG = 0;
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slot.u.bits.DeviceNumber =
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HalpFixedAcpiDescTable.reset_reg.Address.HighPart;
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slot.u.bits.FunctionNumber =
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HalpFixedAcpiDescTable.reset_reg.Address.LowPart >> 16;
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HalSetBusDataByOffset(PCIBus,
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0,
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slot.u.AsULONG,
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&HalpFixedAcpiDescTable.reset_val,
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HalpFixedAcpiDescTable.reset_reg.Address.LowPart & 0xff,
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1);
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break;
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}
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}
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#endif
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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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HalpHalt();
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}
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#ifndef ACPI_HAL
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VOID
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HaliHaltSystem (
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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 is called when the machine has crashed and is to be
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halted
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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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_asm {
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cli
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hlt
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}
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}
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VOID
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HalpCheckPowerButton (
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VOID
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)
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{
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}
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#endif
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