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- ## @file
- # This FDF include file computes the end of the scratch buffer used in
- # DecompressMemFvs() [OvmfPkg/Sec/SecMain.c]. It is based on the decompressed
- # (ie. original) size of the LZMA-compressed section of the one FFS file in
- # the FVMAIN_COMPACT firmware volume.
- #
- # Copyright (C) 2015, Red Hat, Inc.
- #
- # SPDX-License-Identifier: BSD-2-Clause-Patent
- ##
- # The GUID EE4E5898-3914-4259-9D6E-DC7BD79403CF means "LzmaCustomDecompress".
- # The decompressed output will have the following structure (see the file
- # "9E21FD93-9C72-4c15-8C4B-E77F1DB2D792SEC1.guided.dummy" in the
- # Build/Ovmf*/*/FV/Ffs/9E21FD93-9C72-4c15-8C4B-E77F1DB2D792/ directory):
- #
- # Size Contents
- # ------------------- --------------------------------------------------------
- # 4 EFI_COMMON_SECTION_HEADER, stating size 124 (0x7C) and
- # type 0x19 (EFI_SECTION_RAW). The purpose of this section
- # is to pad the start of PEIFV to 128 bytes.
- # 120 Zero bytes (padding).
- #
- # 4 EFI_COMMON_SECTION_HEADER, stating size
- # (PcdOvmfPeiMemFvSize + 4), and type 0x17
- # (EFI_SECTION_FIRMWARE_VOLUME_IMAGE).
- # PcdOvmfPeiMemFvSize PEIFV. Note that the above sizes pad the offset of this
- # object to 128 bytes. See also the "guided.dummy.txt"
- # file in the same directory.
- #
- # 4 EFI_COMMON_SECTION_HEADER, stating size 12 (0xC) and
- # type 0x19 (EFI_SECTION_RAW). The purpose of this section
- # is to pad the start of DXEFV to 16 bytes.
- # 8 Zero bytes (padding).
- #
- # 4 EFI_COMMON_SECTION_HEADER, stating size
- # (PcdOvmfDxeMemFvSize + 4), and type 0x17
- # (EFI_SECTION_FIRMWARE_VOLUME_IMAGE).
- # PcdOvmfDxeMemFvSize DXEFV. Note that the above sizes pad the offset of this
- # object to 16 bytes. See also the "guided.dummy.txt" file
- # in the same directory.
- #
- # The total size after decompression is (128 + PcdOvmfPeiMemFvSize + 16 +
- # PcdOvmfDxeMemFvSize).
- DEFINE OUTPUT_SIZE = (128 + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvSize + 16 + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize)
- # LzmaCustomDecompressLib uses a constant scratch buffer size of 64KB; see
- # SCRATCH_BUFFER_REQUEST_SIZE in
- # "MdeModulePkg/Library/LzmaCustomDecompressLib/LzmaDecompress.c".
- DEFINE DECOMP_SCRATCH_SIZE = 0x00010000
- # Note: when we use PcdOvmfDxeMemFvBase in this context, BaseTools have not yet
- # offset it with MEMFD's base address. For that reason we have to do it manually.
- #
- # The calculation below mirrors DecompressMemFvs() [OvmfPkg/Sec/SecMain.c].
- DEFINE OUTPUT_BASE = ($(MEMFD_BASE_ADDRESS) + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase + 0x00100000)
- DEFINE DECOMP_SCRATCH_BASE_UNALIGNED = ($(OUTPUT_BASE) + $(OUTPUT_SIZE))
- DEFINE DECOMP_SCRATCH_BASE_ALIGNMENT = 0x000FFFFF
- DEFINE DECOMP_SCRATCH_BASE_MASK = 0xFFF00000
- DEFINE DECOMP_SCRATCH_BASE = (($(DECOMP_SCRATCH_BASE_UNALIGNED) + $(DECOMP_SCRATCH_BASE_ALIGNMENT)) & $(DECOMP_SCRATCH_BASE_MASK))
- SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd = $(DECOMP_SCRATCH_BASE) + $(DECOMP_SCRATCH_SIZE)
- #
- # The range of pages that should be pre-validated during the SEC phase when SEV-SNP is active in the guest VM.
- SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecValidatedStart = $(MEMFD_BASE_ADDRESS) + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase
- SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecValidatedEnd = $(DECOMP_SCRATCH_BASE) + $(DECOMP_SCRATCH_SIZE)
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