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Synchronize function's comments with UEFI specification.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6058 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
klu2
2008-09-28 05:30:46 +00:00
parent d04dc0272d
commit 8377875baa
5 changed files with 105 additions and 32 deletions
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23
MdePkg/Include/Protocol/Variable.h
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@@ -1,13 +1,24 @@
/** @file
Variable Architectural Protocol as defined in PI Specification VOLUME 2 DXE
This code is used to produce the UEFI 2.0 runtime variable services
This provides the services required to get and set environment variables. This
protocol must be produced by a runtime DXE driver and may be consumed only by
the DXE Foundation. The DXE driver that produces this protocol must be a runtime
driver. This driver is responsible for initializing the GetVariable(),
GetNextVariableName(), and SetVariable() fields of the UEFI Runtime Services Table.
The GetVariable (), GetNextVariableName (), and SetVariable () UEFI 2.0
services are added to the EFI system table and the
EFI_VARIABLE_ARCH_PROTOCOL_GUID protocol is registered with a NULL pointer.
No CRC of the EFI system table is required, as it is done in the DXE core.
After the three fields of the UEFI Runtime Services Table have been initialized,
the driver must install the EFI_VARIABLE_ARCH_PROTOCOL_GUID on a new handle with
a NULL interface pointer. The installation of this protocol informs the DXE Foundation
that the read-only and the volatile environment variable related services are
now available and that the DXE Foundation must update the 32-bit CRC of the UEFI
Runtime Services Table. The full complement of environment variable services are
not available until both this protocol and EFI_VARIABLE_WRITE_ARCH_PROTOCOL are
installed. DXE drivers that require read-only access or read/write access to volatile
environment variables must have this architectural protocol in their dependency
expressions. DXE drivers that require write access to nonvolatile environment
variables must have the EFI_VARIABLE_WRITE_ARCH_PROTOCOL in their dependency
expressions.
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials