diff options
| author | Anthony PERARD <anthony.perard@citrix.com> | 2019-08-13 12:30:49 +0100 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2019-08-21 18:03:49 +0200 |
| commit | 1e9d6b0f98b53498f8ae4104502da087493eba2c (patch) | |
| tree | 56619502f67c2e73202e17050c08485e6e78c6c5 /OvmfPkg/OvmfXen.fdf | |
| parent | 3b96221f77f4181524657e145b51fa423f3faebe (diff) | |
| download | edk2-1e9d6b0f98b53498f8ae4104502da087493eba2c.tar.gz | |
OvmfPkg/OvmfXen: Creating an ELF header
This patch changes the flash device image of OvmfXen to make it look
like it's an ELF. For this, we replace the empty embedded variable store
by a binary array, which is a ELF file header.
The ELF header explain to a loader to load the binary at the address
1MB, then jump to the PVH entry point which will be created in a later
patch. The header also includes a Xen ELF note that is part of the
PVH ABI.
That patch include OvmfXenElfHeaderGenerator.c which can be use to
regenerate the ELF header, but this will be a manual step.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-6-anthony.perard@citrix.com>
Diffstat (limited to 'OvmfPkg/OvmfXen.fdf')
| -rw-r--r-- | OvmfPkg/OvmfXen.fdf | 101 |
1 files changed, 98 insertions, 3 deletions
diff --git a/OvmfPkg/OvmfXen.fdf b/OvmfPkg/OvmfXen.fdf index 2ceff7baa2..43c268f6cb 100644 --- a/OvmfPkg/OvmfXen.fdf +++ b/OvmfPkg/OvmfXen.fdf @@ -15,8 +15,8 @@ !include OvmfPkg.fdf.inc
#
-# Build the variable store and the firmware code as one unified flash device
-# image.
+# This will allow the flash device image to be recognize as an ELF, with first
+# an ELF headers, then the firmware code.
#
[FD.OVMF]
BaseAddress = $(FW_BASE_ADDRESS)
@@ -25,7 +25,102 @@ ErasePolarity = 1 BlockSize = $(BLOCK_SIZE)
NumBlocks = $(FW_BLOCKS)
-!include VarStore.fdf.inc
+!if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
+0x00000000|0x0000e000
+!endif
+!if $(FD_SIZE_IN_KB) == 4096
+0x00000000|0x00040000
+!endif
+DATA = {
+ #
+ # This hex array have been generated by OvmfPkg/OvmfXenElfHeaderGenerator.c
+ # and copied manually.
+ #
+ # ELF file header
+ 0x7f, 0x45, 0x4c, 0x46, # e_ident[0..3]: Magic number
+ 0x01, # File class: 32-bit objects
+ 0x01, # Data encoding: 2's complement, little endian
+ 0x01, # File version
+ 0x03, # OS ABI identification: Object uses GNU ELF extensions
+ 0x00, # ABI version
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, # e_ident[EI_PAD...]
+ 0x02, 0x00, # e_type = Executable file
+ 0x03, 0x00, # e_machine = Intel 80386
+ 0x01, 0x00, 0x00, 0x00, # e_version
+ 0xd0, 0xff, 0x2f, 0x00, # e_entry: Entry point virtual address
+ 0x34, 0x00, 0x00, 0x00, # e_phoff: Program header table file offset
+ 0x00, 0x00, 0x00, 0x00, # e_shoff: Section header table file offset
+ 0x00, 0x00, 0x00, 0x00, # e_flags: Processor-specific flags
+ 0x34, 0x00, # e_ehsize: ELF header size
+ 0x20, 0x00, # e_phentsize: Program header table entry size
+ 0x02, 0x00, # e_phnum: Program header table entry count
+ 0x00, 0x00, # e_shentsize: Section header table entry size
+ 0x00, 0x00, # e_shnum: Section header table entry count
+ 0x00, 0x00, # e_shstrndx
+
+ # ELF Program segment headers
+ # - Load segment
+ 0x01, 0x00, 0x00, 0x00, # p_type = Loadable program segment
+ 0x00, 0x00, 0x00, 0x00, # p_offset
+ 0x00, 0x00, 0x10, 0x00, # p_vaddr: Segment virtual address
+ 0x00, 0x00, 0x10, 0x00, # p_paddr: Segment physical address
+ 0x00, 0x00, 0x20, 0x00, # p_filesz: Segment size in file
+ 0x00, 0x00, 0x20, 0x00, # p_memsz: Segment size in memory
+ 0x07, 0x00, 0x00, 0x00, # p_flags = Segment is executable | writable | readable
+ 0x00, 0x00, 0x00, 0x00, # p_align
+ # - ELFNOTE segment
+ 0x04, 0x00, 0x00, 0x00, # p_type = PT_NOTE
+ 0x74, 0x00, 0x00, 0x00, # p_offset = point to XEN_ELFNOTE_PHYS32_ENTRY below
+ 0x74, 0x00, 0x10, 0x00,
+ 0x74, 0x00, 0x10, 0x00,
+ 0x14, 0x00, 0x00, 0x00,
+ 0x14, 0x00, 0x00, 0x00,
+ 0x04, 0x00, 0x00, 0x00, # p_flags = Segment is readable
+ 0x00, 0x00, 0x00, 0x00,
+
+ # XEN_ELFNOTE_PHYS32_ENTRY
+ 0x04, 0x00, 0x00, 0x00, # name size
+ 0x04, 0x00, 0x00, 0x00, # desc size
+ 0x12, 0x00, 0x00, 0x00, # type = XEN_ELFNOTE_PHYS32_ENTRY
+ 0x58, 0x65, 0x6e, 0x00, # name = "Xen"
+ 0xd0, 0xff, 0x2f, 0x00, # desc: PVH entry point
+ 0x00
+}
+
+!if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
+0x0000e000|0x00001000
+!endif
+!if $(FD_SIZE_IN_KB) == 4096
+0x00040000|0x00001000
+!endif
+#NV_EVENT_LOG
+
+!if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
+0x0000f000|0x00001000
+!endif
+!if $(FD_SIZE_IN_KB) == 4096
+0x00041000|0x00001000
+!endif
+#NV_FTW_WORKING
+DATA = {
+ # EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER->Signature = gEdkiiWorkingBlockSignatureGuid =
+ # { 0x9e58292b, 0x7c68, 0x497d, { 0xa0, 0xce, 0x65, 0x0, 0xfd, 0x9f, 0x1b, 0x95 }}
+ 0x2b, 0x29, 0x58, 0x9e, 0x68, 0x7c, 0x7d, 0x49,
+ 0xa0, 0xce, 0x65, 0x0, 0xfd, 0x9f, 0x1b, 0x95,
+ # Crc:UINT32 #WorkingBlockValid:1, WorkingBlockInvalid:1, Reserved
+ 0x2c, 0xaf, 0x2c, 0x64, 0xFE, 0xFF, 0xFF, 0xFF,
+ # WriteQueueSize: UINT64
+ 0xE0, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+}
+
+!if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
+0x00010000|0x00010000
+!endif
+!if $(FD_SIZE_IN_KB) == 4096
+0x00042000|0x00042000
+!endif
+#NV_FTW_SPARE
+
$(VARS_SIZE)|$(FVMAIN_SIZE)
FV = FVMAIN_COMPACT
|