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 53 DEFINE 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 59 DEFINE 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 66 DEFINE OUTPUT_BASE = ($(MEMFD_BASE_ADDRESS) + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase + 0x00100000) 67 DEFINE DECOMP_SCRATCH_BASE_UNALIGNED = ($(OUTPUT_BASE) + $(OUTPUT_SIZE)) 68 DEFINE DECOMP_SCRATCH_BASE_ALIGNMENT = 0x000FFFFF 69 DEFINE DECOMP_SCRATCH_BASE_MASK = 0xFFF00000 70 DEFINE DECOMP_SCRATCH_BASE = (($(DECOMP_SCRATCH_BASE_UNALIGNED) + $(DECOMP_SCRATCH_BASE_ALIGNMENT)) & $(DECOMP_SCRATCH_BASE_MASK)) 71 72 SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd = $(DECOMP_SCRATCH_BASE) + $(DECOMP_SCRATCH_SIZE) 73
