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46 lines
2.2 KiB
46 lines
2.2 KiB
4 years ago
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/** @file
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Variable Architectural Protocol as defined in PI Specification VOLUME 2 DXE
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This provides the services required to get and set environment variables. This
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protocol must be produced by a runtime DXE driver and may be consumed only by
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the DXE Foundation. The DXE driver that produces this protocol must be a runtime
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driver. This driver is responsible for initializing the GetVariable(),
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GetNextVariableName(), and SetVariable() fields of the UEFI Runtime Services Table.
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After the three fields of the UEFI Runtime Services Table have been initialized,
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the driver must install the EFI_VARIABLE_ARCH_PROTOCOL_GUID on a new handle with
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a NULL interface pointer. The installation of this protocol informs the DXE Foundation
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that the read-only and the volatile environment variable related services are
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now available and that the DXE Foundation must update the 32-bit CRC of the UEFI
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Runtime Services Table. The full complement of environment variable services are
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not available until both this protocol and EFI_VARIABLE_WRITE_ARCH_PROTOCOL are
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installed. DXE drivers that require read-only access or read/write access to volatile
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environment variables must have this architectural protocol in their dependency
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expressions. DXE drivers that require write access to nonvolatile environment
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variables must have the EFI_VARIABLE_WRITE_ARCH_PROTOCOL in their dependency
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expressions.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __ARCH_PROTOCOL_VARIABLE_ARCH_H__
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#define __ARCH_PROTOCOL_VARIABLE_ARCH_H__
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///
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/// Global ID for the Variable Architectural Protocol
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///
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#define EFI_VARIABLE_ARCH_PROTOCOL_GUID \
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{ 0x1e5668e2, 0x8481, 0x11d4, {0xbc, 0xf1, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } }
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extern EFI_GUID gEfiVariableArchProtocolGuid;
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#endif
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