1 files changed, 65 insertions, 0 deletions
diff --git a/OvmfPkg/Bhyve/FvmainCompactScratchEnd.fdf.inc b/OvmfPkg/Bhyve/FvmainCompactScratchEnd.fdf.inc
new file mode 100644
index 0000000000..46f5258329
--- /dev/null
+++ b/OvmfPkg/Bhyve/FvmainCompactScratchEnd.fdf.inc
@@ -0,0 +1,65 @@
+## @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)