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https://github.com/reactos/reactos.git
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118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
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* PROJECT: ReactOS HAL
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: hal/halx86/generic/reboot.c
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* PURPOSE: Reboot functions
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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* Eric Kohl
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*/
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/* INCLUDES ******************************************************************/
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#include <hal.h>
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#define NDEBUG
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#include <debug.h>
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#define GetPteAddress(x) (PHARDWARE_PTE)(((((ULONG_PTR)(x)) >> 12) << 2) + 0xC0000000)
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/* PRIVATE FUNCTIONS *********************************************************/
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VOID
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NTAPI
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HalpWriteResetCommand(VOID)
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{
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/* Generate RESET signal via keyboard controller */
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WRITE_PORT_UCHAR((PUCHAR)0x64, 0xFE);
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};
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VOID
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NTAPI
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HalpReboot(VOID)
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{
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UCHAR Data;
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PVOID ZeroPageMapping;
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PHARDWARE_PTE Pte;
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/* Get a PTE in the HAL reserved region */
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ZeroPageMapping = (PVOID)(0xFFC00000 + PAGE_SIZE);
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Pte = GetPteAddress(ZeroPageMapping);
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/* Make it valid and map it to the first physical page */
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Pte->Valid = 1;
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Pte->Write = 1;
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Pte->Owner = 1;
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Pte->PageFrameNumber = 0;
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/* Flush the TLB by resetting CR3 */
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__writecr3(__readcr3());
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/* Enable warm reboot */
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((PUSHORT)ZeroPageMapping)[0x239] = 0x1234;
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/* Lock CMOS Access (and disable interrupts) */
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HalpAcquireSystemHardwareSpinLock();
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/* Setup control register B */
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WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
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KeStallExecutionProcessor(1);
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/* Read periodic register and clear the interrupt enable */
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Data = READ_PORT_UCHAR((PUCHAR)0x71);
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WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
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KeStallExecutionProcessor(1);
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/* Setup control register A */
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WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
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KeStallExecutionProcessor(1);
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/* Read divider rate and reset it */
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Data = READ_PORT_UCHAR((PUCHAR)0x71);
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WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
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KeStallExecutionProcessor(1);
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/* Reset neutral CMOS address */
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WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
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KeStallExecutionProcessor(1);
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/* Flush write buffers and send the reset command */
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KeFlushWriteBuffer();
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HalpWriteResetCommand();
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/* Halt the CPU */
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__halt();
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}
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/* PUBLIC FUNCTIONS **********************************************************/
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/*
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* @implemented
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*/
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VOID
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NTAPI
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HalReturnToFirmware(IN FIRMWARE_REENTRY Action)
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{
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/* Check what kind of action this is */
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switch (Action)
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{
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/* All recognized actions */
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case HalHaltRoutine:
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case HalRebootRoutine:
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#ifndef _MINIHAL_
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/* Acquire the display */
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InbvAcquireDisplayOwnership();
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#endif
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/* Call the internal reboot function */
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HalpReboot();
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/* Anything else */
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default:
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/* Print message and break */
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DbgPrint("HalReturnToFirmware called!\n");
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DbgBreakPoint();
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}
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}
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/* EOF */
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