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/** @file
Reset System Library functions for OVMF
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h> // BIT1
#include <Library/BaseLib.h> // CpuDeadLoop()
#include <Library/IoLib.h> // IoWrite8()
#include <Library/ResetSystemLib.h> // ResetCold()
#include <Library/TimerLib.h> // MicroSecondDelay()
/**
Calling this function causes a system-wide reset. This sets
all circuitry within the system to its initial state. This type of reset
is asynchronous to system operation and operates without regard to
cycle boundaries.
System reset should not return, if it returns, it means the system does
not support cold reset.
**/
VOID
EFIAPI
ResetCold (
VOID
)
{
IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
MicroSecondDelay (50);
IoWrite8 (0x64, 0xfe); // 2nd choice: keyboard controller
CpuDeadLoop ();
}
/**
Calling this function causes a system-wide initialization. The processors
are set to their initial state, and pending cycles are not corrupted.
System reset should not return, if it returns, it means the system does
not support warm reset.
**/
VOID
EFIAPI
ResetWarm (
VOID
)
{
IoWrite8 (0x64, 0xfe);
CpuDeadLoop ();
}
/**
This function causes a systemwide reset. The exact type of the reset is
defined by the EFI_GUID that follows the Null-terminated Unicode string
passed into ResetData. If the platform does not recognize the EFI_GUID in
ResetData the platform must pick a supported reset type to perform.The
platform may optionally log the parameters from any non-normal reset that
occurs.
@param[in] DataSize The size, in bytes, of ResetData.
@param[in] ResetData The data buffer starts with a Null-terminated string,
followed by the EFI_GUID.
**/
VOID
EFIAPI
ResetPlatformSpecific (
IN UINTN DataSize,
IN VOID *ResetData
)
{
ResetCold ();
}
/**
The ResetSystem function resets the entire platform.
@param[in] ResetType The type of reset to perform.
@param[in] ResetStatus The status code for the reset.
@param[in] DataSize The size, in bytes, of ResetData.
@param[in] ResetData For a ResetType of EfiResetCold, EfiResetWarm, or
EfiResetShutdown the data buffer starts with a
Null-terminated string, optionally followed by
additional binary data. The string is a description
that the caller may use to further indicate the
reason for the system reset.
**/
VOID
EFIAPI
ResetSystem (
IN EFI_RESET_TYPE ResetType,
IN EFI_STATUS ResetStatus,
IN UINTN DataSize,
IN VOID *ResetData OPTIONAL
)
{
switch (ResetType) {
case EfiResetWarm:
ResetWarm ();
break;
case EfiResetCold:
ResetCold ();
break;
case EfiResetShutdown:
ResetShutdown ();
break;
case EfiResetPlatformSpecific:
ResetPlatformSpecific (DataSize, ResetData);
break;
default:
break;
}
}
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