1## @file 2# This FDF include file computes the end of the scratch buffer used in 3# DecompressMemFvs() [OvmfPkg/Sec/SecMain.c]. It is based on the decompressed 4# (ie. original) size of the LZMA-compressed section of the one FFS file in 5# the FVMAIN_COMPACT firmware volume. 6# 7# Copyright (C) 2015, Red Hat, Inc. 8# 9# This program and the accompanying materials are licensed and made available 10# under the terms and conditions of the BSD License which accompanies this 11# distribution. The full text of the license may be found at 12# http://opensource.org/licenses/bsd-license.php 13# 14# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 15# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 16# IMPLIED. 17## 18 19# The GUID EE4E5898-3914-4259-9D6E-DC7BD79403CF means "LzmaCustomDecompress". 20# The decompressed output will have the following structure (see the file 21# "9E21FD93-9C72-4c15-8C4B-E77F1DB2D792SEC1.guided.dummy" in the 22# Build/Ovmf*/*/FV/Ffs/9E21FD93-9C72-4c15-8C4B-E77F1DB2D792/ directory): 23# 24# Size Contents 25# ------------------- -------------------------------------------------------- 26# 4 EFI_COMMON_SECTION_HEADER, stating size 124 (0x7C) and 27# type 0x19 (EFI_SECTION_RAW). The purpose of this section 28# is to pad the start of PEIFV to 128 bytes. 29# 120 Zero bytes (padding). 30# 31# 4 EFI_COMMON_SECTION_HEADER, stating size 32# (PcdOvmfPeiMemFvSize + 4), and type 0x17 33# (EFI_SECTION_FIRMWARE_VOLUME_IMAGE). 34# PcdOvmfPeiMemFvSize PEIFV. Note that the above sizes pad the offset of this 35# object to 128 bytes. See also the "guided.dummy.txt" 36# file in the same directory. 37# 38# 4 EFI_COMMON_SECTION_HEADER, stating size 12 (0xC) and 39# type 0x19 (EFI_SECTION_RAW). The purpose of this section 40# is to pad the start of DXEFV to 16 bytes. 41# 8 Zero bytes (padding). 42# 43# 4 EFI_COMMON_SECTION_HEADER, stating size 44# (PcdOvmfDxeMemFvSize + 4), and type 0x17 45# (EFI_SECTION_FIRMWARE_VOLUME_IMAGE). 46# PcdOvmfDxeMemFvSize DXEFV. Note that the above sizes pad the offset of this 47# object to 16 bytes. See also the "guided.dummy.txt" file 48# in the same directory. 49# 50# The total size after decompression is (128 + PcdOvmfPeiMemFvSize + 16 + 51# PcdOvmfDxeMemFvSize). 52 53DEFINE OUTPUT_SIZE = (128 + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvSize + 16 + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize) 54 55# LzmaCustomDecompressLib uses a constant scratch buffer size of 64KB; see 56# SCRATCH_BUFFER_REQUEST_SIZE in 57# "MdeModulePkg/Library/LzmaCustomDecompressLib/LzmaDecompress.c". 58 59DEFINE DECOMP_SCRATCH_SIZE = 0x00010000 60 61# Note: when we use PcdOvmfDxeMemFvBase in this context, BaseTools have not yet 62# offset it with MEMFD's base address. For that reason we have to do it manually. 63# 64# The calculation below mirrors DecompressMemFvs() [OvmfPkg/Sec/SecMain.c]. 65 66DEFINE OUTPUT_BASE = ($(MEMFD_BASE_ADDRESS) + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase + 0x00100000) 67DEFINE DECOMP_SCRATCH_BASE_UNALIGNED = ($(OUTPUT_BASE) + $(OUTPUT_SIZE)) 68DEFINE DECOMP_SCRATCH_BASE_ALIGNMENT = 0x000FFFFF 69DEFINE DECOMP_SCRATCH_BASE_MASK = 0xFFF00000 70DEFINE DECOMP_SCRATCH_BASE = (($(DECOMP_SCRATCH_BASE_UNALIGNED) + $(DECOMP_SCRATCH_BASE_ALIGNMENT)) & $(DECOMP_SCRATCH_BASE_MASK)) 71 72SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd = $(DECOMP_SCRATCH_BASE) + $(DECOMP_SCRATCH_SIZE) 73