## @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. # # 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. ## # 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)