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/** @file
If a GUID-defined section is encountered when doing section
extraction, the section extraction driver calls the appropriate
instance of the GUIDed Section Extraction Protocol to extract
the section stream contained therein.
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
@par Revision Reference: PI
Version 1.00.
**/
#ifndef __GUID_SECTION_EXTRACTION_PROTOCOL_H__
#define __GUID_SECTION_EXTRACTION_PROTOCOL_H__
//
// The protocol interface structures are identified by associating
// them with a GUID. Each instance of a protocol with a given
// GUID must have the same interface structure. While all instances
// of the GUIDed Section Extraction Protocol must have the same
// interface structure, they do not all have the same GUID. The
// GUID that is associated with an instance of the GUIDed Section
// Extraction Protocol is used to correlate it with the GUIDed
// section type that it is intended to process.
//
typedef struct _EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL;
/**
The ExtractSection() function processes the input section and
allocates a buffer from the pool in which it returns the section
contents. If the section being extracted contains
authentication information (the section's
GuidedSectionHeader.Attributes field has the
EFI_GUIDED_SECTION_AUTH_STATUS_VALID bit set), the values
returned in AuthenticationStatus must reflect the results of
the authentication operation. Depending on the algorithm and
size of the encapsulated data, the time that is required to do
a full authentication may be prohibitively long for some
classes of systems. To indicate this, use
EFI_SECURITY_POLICY_PROTOCOL_GUID, which may be published by
the security policy driver (see the Platform Initialization
Driver Execution Environment Core Interface Specification for
more details and the GUID definition). If the
EFI_SECURITY_POLICY_PROTOCOL_GUID exists in the handle
database, then, if possible, full authentication should be
skipped and the section contents simply returned in the
OutputBuffer. In this case, the
EFI_AUTH_STATUS_PLATFORM_OVERRIDE bit AuthenticationStatus
must be set on return. ExtractSection() is callable only from
TPL_NOTIFY and below. Behavior of ExtractSection() at any
EFI_TPL above TPL_NOTIFY is undefined. Type EFI_TPL is
defined in RaiseTPL() in the UEFI 2.0 specification.
@param This Indicates the EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL instance.
@param InputSection Buffer containing the input GUIDed section
to be processed. OutputBuffer OutputBuffer
is allocated from boot services pool
memory and contains the new section
stream. The caller is responsible for
freeing this buffer.
@param OutputSize A pointer to a caller-allocated UINTN in
which the size of OutputBuffer allocation
is stored. If the function returns
anything other than EFI_SUCCESS, the value
of OutputSize is undefined.
@param AuthenticationStatus A pointer to a caller-allocated
UINT32 that indicates the
authentication status of the
output buffer. If the input
section's
GuidedSectionHeader.Attributes
field has the
EFI_GUIDED_SECTION_AUTH_STATUS_VAL
bit as clear, AuthenticationStatus
must return zero. Both local bits
(19:16) and aggregate bits (3:0)
in AuthenticationStatus are
returned by ExtractSection().
These bits reflect the status of
the extraction operation. The bit
pattern in both regions must be
the same, as the local and
aggregate authentication statuses
have equivalent meaning at this
level. If the function returns
anything other than EFI_SUCCESS,
the value of AuthenticationStatus
is undefined.
@retval EFI_SUCCESS The InputSection was successfully
processed and the section contents were
returned.
@retval EFI_OUT_OF_RESOURCES The system has insufficient
resources to process the
request.
@retval EFI_INVALID_PARAMETER The GUID in InputSection does
not match this instance of the
GUIDed Section Extraction
Protocol.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_EXTRACT_GUIDED_SECTION)(
IN CONST EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL *This,
IN CONST VOID *InputSection,
OUT VOID **OutputBuffer,
OUT UINTN *OutputSize,
OUT UINT32 *AuthenticationStatus
);
///
/// Typically, protocol interface structures are identified by associating them with a GUID. Each
/// instance of a protocol with a given GUID must have the same interface structure. While all instances
/// of the GUIDed Section Extraction Protocol must have the same interface structure, they do not all
/// have the same GUID. The GUID that is associated with an instance of the GUIDed Section
/// Extraction Protocol is used to correlate it with the GUIDed section type that it is intended to process.
///
struct _EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL {
EFI_EXTRACT_GUIDED_SECTION ExtractSection;
};
#endif
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