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40 lines
1.8 KiB
C
40 lines
1.8 KiB
C
/** @file
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Variable Write Architectural Protocol as defined in PI Specification VOLUME 2 DXE
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This provides the services required to set nonvolatile environment variables.
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This protocol must be produced by a runtime DXE driver and may be consumed only
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by the DXE Foundation.
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The DXE driver that produces this protocol must be a runtime driver. This driver
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may update the SetVariable() field of the UEFI Runtime Services Table.
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After the UEFI Runtime Services Table has been initialized, the driver must
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install the EFI_VARIABLE_WRITE_ARCH_PROTOCOL_GUID on a new handle with a NULL
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interface pointer. The installation of this protocol informs the DXE Foundation
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that the write services for nonvolatile environment variables are now available
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and that the DXE Foundation must update the 32-bit CRC of the UEFI Runtime Services
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Table. The full complement of environment variable services are not available
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until both this protocol and EFI_VARIABLE_ARCH_PROTOCOL are installed. DXE drivers
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that require read-only access or read/write access to volatile environment variables
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must have the EFI_VARIABLE_WRITE_ARCH_PROTOCOL in their dependency expressions.
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DXE drivers that require write access to nonvolatile environment variables must
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have this architectural protocol in their dependency expressions.
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Copyright (c) 2006 - 2018, Intel 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 __ARCH_PROTOCOL_VARIABLE_WRITE_ARCH_H__
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#define __ARCH_PROTOCOL_VARIABLE_WRITE_ARCH_H__
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///
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/// Global ID for the Variable Write Architectural Protocol
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///
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#define EFI_VARIABLE_WRITE_ARCH_PROTOCOL_GUID \
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{ 0x6441f818, 0x6362, 0x4e44, {0xb5, 0x70, 0x7d, 0xba, 0x31, 0xdd, 0x24, 0x53 } }
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extern EFI_GUID gEfiVariableWriteArchProtocolGuid;
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#endif
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