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131 lines
5.2 KiB
C
131 lines
5.2 KiB
C
/** @file
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This header describes various helper functions for resetting the system.
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Copyright (c) 2017 - 2019 Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2016 Microsoft Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _RESET_UTILITY_LIB_H_
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#define _RESET_UTILITY_LIB_H_
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#include <Uefi/UefiMultiPhase.h>
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/**
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This is a shorthand helper function to reset with reset type and a subtype
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so that the caller doesn't have to bother with a function that has half
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a dozen parameters.
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This will generate a reset with status EFI_SUCCESS, a NULL string, and
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no custom data. The subtype will be formatted in such a way that it can be
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picked up by notification registrations and custom handlers.
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NOTE: This call will fail if the architectural ResetSystem underpinnings
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are not initialized. For DXE, you can add gEfiResetArchProtocolGuid
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to your DEPEX.
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@param[in] ResetType The default EFI_RESET_TYPE of the reset.
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@param[in] ResetSubtype GUID pointer for the reset subtype to be used.
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**/
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VOID
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EFIAPI
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ResetSystemWithSubtype (
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IN EFI_RESET_TYPE ResetType,
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IN CONST GUID *ResetSubtype
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);
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/**
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This is a shorthand helper function to reset with the reset type
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'EfiResetPlatformSpecific' and a subtype so that the caller doesn't
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have to bother with a function that has half a dozen parameters.
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This will generate a reset with status EFI_SUCCESS, a NULL string, and
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no custom data. The subtype will be formatted in such a way that it can be
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picked up by notification registrations and custom handlers.
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NOTE: This call will fail if the architectural ResetSystem underpinnings
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are not initialized. For DXE, you can add gEfiResetArchProtocolGuid
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to your DEPEX.
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@param[in] ResetSubtype GUID pointer for the reset subtype to be used.
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**/
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VOID
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EFIAPI
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ResetPlatformSpecificGuid (
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IN CONST GUID *ResetSubtype
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);
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/**
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This function examines the DataSize and ResetData parameters passed to
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to ResetSystem() and detemrines if the ResetData contains a Null-terminated
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Unicode string followed by a GUID specific subtype. If the GUID specific
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subtype is present, then a pointer to the GUID value in ResetData is returned.
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@param[in] DataSize The size, in bytes, of ResetData.
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@param[in] ResetData Pointer to the data buffer passed into ResetSystem().
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@retval Pointer Pointer to the GUID value in ResetData.
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@retval NULL ResetData is NULL.
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@retval NULL ResetData does not start with a Null-terminated
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Unicode string.
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@retval NULL A Null-terminated Unicode string is present, but there
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are less than sizeof (GUID) bytes after the string.
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@retval NULL No subtype is found.
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**/
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GUID *
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EFIAPI
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GetResetPlatformSpecificGuid (
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IN UINTN DataSize,
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IN CONST VOID *ResetData
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);
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/**
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This is a helper function that creates the reset data buffer that can be
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passed into ResetSystem().
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The reset data buffer is returned in ResetData and contains ResetString
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followed by the ResetSubtype GUID followed by the ExtraData.
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NOTE: Strings are internally limited by MAX_UINT16.
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@param[in, out] ResetDataSize On input, the size of the ResetData buffer. On
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output, either the total number of bytes
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copied, or the required buffer size.
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@param[in, out] ResetData A pointer to the buffer in which to place the
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final structure.
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@param[in] ResetSubtype Pointer to the GUID specific subtype. This
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parameter is optional and may be NULL.
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@param[in] ResetString Pointer to a Null-terminated Unicode string
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that describes the reset. This parameter is
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optional and may be NULL.
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@param[in] ExtraDataSize The size, in bytes, of ExtraData buffer.
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@param[in] ExtraData Pointer to a buffer of extra data. This
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parameter is optional and may be NULL.
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@retval RETURN_SUCCESS ResetDataSize and ResetData are updated.
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@retval RETURN_INVALID_PARAMETER ResetDataSize is NULL.
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@retval RETURN_INVALID_PARAMETER ResetData is NULL.
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@retval RETURN_INVALID_PARAMETER ExtraData was provided without a
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ResetSubtype. This is not supported by the
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UEFI spec.
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@retval RETURN_BUFFER_TOO_SMALL An insufficient buffer was provided.
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ResetDataSize is updated with minimum size
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required.
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**/
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RETURN_STATUS
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EFIAPI
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BuildResetData (
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IN OUT UINTN *ResetDataSize,
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IN OUT VOID *ResetData,
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IN CONST GUID *ResetSubtype OPTIONAL,
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IN CONST CHAR16 *ResetString OPTIONAL,
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IN UINTN ExtraDataSize OPTIONAL,
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IN CONST VOID *ExtraData OPTIONAL
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);
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#endif // _RESET_UTILITY_LIB_H_
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