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