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[Xen-devel] [PATCH V3 00/15] arm64 EFI stub

This patch series adds EFI boot support for arm64.  A PE/COFF header is created
in head.S, as there is no toolchain support for PE/COFF on arm64.  This also
has the advantage that the file is both an "Image" file and a PE/COFF
executable - the same binary can be loaded and run either way.  The EFI 'stub'
code is a shim layer that serves as the loader for the XEN kernel in the EFI
environment.  The stub loads the dom0 kernel and initrd if required, and adds
entries for them as well as for the EFI data structures into the device tree
passed to XEN.  Once the device tree is constructed, EFI boot services are
exited, and the stub transfers control to the normal XEN entry point.  The only
indication XEN has that it was loaded via the stub is that the device tree
contains EFI properties.  This is all very similar to the arm/arm64 Linux
kernel EFI stubs.

I'm not really that happy with how the x86 build works, in particular the rule
I added to arch/x86/Makefile to build boot.init.o to fix parallel builds.  Due
to the way the EFI build is done - building 2 executables at the same time with
different EFI code included in each, the normal common build infrastructure
doesn't work.

Changes since v2:
* Major refactor to use common EFI entry point and factor out arch specific
  code, rather than factoring out the common code.
* Update entire libfdt to v1.4.0 to provide fdt_create_empty_tree()

Changes since v1:
* Added common/efi directory for shared EFI code, and arch/arm/efi for 
  arm-specfic code.  Global build hacking of -fshort-wchar removed.
  arm32, arm64, and x86 with/without EFI enabled toolchain all build.
  The x86 build previously autodetected whether the EFI version should
  be built or not based on toolchain support.  I couldn't get this working
  nicely with the common code, so for x86 I have the common code always
  build, and the EFI autodection works as normal for building the EFI
* Basic use of the EFI memory map instead of FDT based memory description.
  More work needed to resolve differences between FDT description of 
  a small number of large memory banks with reserved regions, and EFI's
  potentially long list of available regions, which can be long.
* More refactoring of common EFI code to not directly exit using blexit(),
  as this broke the pre-linking targets.  All shared code returns status,
  and it is up to the caller to exit and clean up.
* Reduced the number of patches.  Refactoring of x86 code first, then moving
  all code to efi-shared.c in one patch.
* Fixed formatting/tab issues in new files, added Emacs footer.
* Fixed efi_get_memory_map to return NULL map pointer on error in addition
  to failed status.
* Added comments in head.S regarding PE/COFF specification, and 1:1 
  mapping used by EFI code.
* Updated device tree bindings to use new multiboot bindings.  Since the stub
  is always built into XEN, we don't have to support older bindings.

Roy Franz (15):
  move EFI boot code to common/efi
  Move x86 specific funtions/variables to arch header
  create arch functions to get and process EFI memory map.
  Add architecture functions for pre/post ExitBootServices
  Add efi_arch_cfg_file() to handle arch specific cfg file fields
  Add efi_arch_handle_cmdline() for processing commandline
  Move x86 specific video and disk probing code
  Add efi_arch_memory() for arch specific memory setup
  Add arch specific module handling to read_file()
  Add SMBIOS and runtime services setup arch functions.
  Add several misc. arch functions for EFI boot code.
  Add efi_arch_use_config_file() function to control use of config file
  add arm64 cache flushing code from linux v3.16
  Update libfdt to v1.4.0
  Add ARM EFI boot support

 .gitignore                          |    2 +
 xen/arch/arm/arm64/Makefile         |    1 +
 xen/arch/arm/arm64/cache.S          |  100 ++
 xen/arch/arm/arm64/head.S           |  145 ++-
 xen/arch/arm/xen.lds.S              |    1 +
 xen/arch/x86/Makefile               |   15 +-
 xen/arch/x86/efi/Makefile           |    4 +-
 xen/arch/x86/efi/boot.c             | 1723 -----------------------------------
 xen/arch/x86/efi/efi.h              |   39 -
 xen/arch/x86/efi/runtime.c          |    2 +-
 xen/common/Makefile                 |    1 +
 xen/common/efi/Makefile             |   17 +
 xen/common/efi/boot.c               |  823 +++++++++++++++++
 xen/common/efi/check.c              |    4 +
 xen/common/efi/dummy.c              |    1 +
 xen/common/efi/efi.h                |   39 +
 xen/common/libfdt/Makefile.libfdt   |    4 +-
 xen/common/libfdt/fdt.c             |   30 +-
 xen/common/libfdt/fdt_empty_tree.c  |   84 ++
 xen/common/libfdt/fdt_ro.c          |    7 +-
 xen/common/libfdt/fdt_rw.c          |   31 +-
 xen/common/libfdt/fdt_sw.c          |    4 +-
 xen/common/libfdt/fdt_wip.c         |    2 +-
 xen/common/libfdt/version.lds       |    6 +
 xen/include/asm-arm/arm64/efibind.h |  216 +++++
 xen/include/asm-arm/efi-boot.h      |  602 ++++++++++++
 xen/include/asm-arm/efi.h           |   29 +
 xen/include/asm-arm/efibind.h       |    2 +
 xen/include/asm-arm/setup.h         |    2 +-
 xen/include/asm-x86/efi-boot.h      | 1064 +++++++++++++++++++++
 xen/include/asm-x86/efi.h           |   39 +
 xen/include/xen/libfdt/fdt.h        |   93 +-
 xen/include/xen/libfdt/libfdt.h     |  315 ++++++-
 xen/include/xen/libfdt/libfdt_env.h |    4 +
 34 files changed, 3627 insertions(+), 1824 deletions(-)
 create mode 100644 xen/arch/arm/arm64/cache.S
 delete mode 100644 xen/arch/x86/efi/boot.c
 delete mode 100644 xen/arch/x86/efi/efi.h
 create mode 100644 xen/common/efi/Makefile
 create mode 100644 xen/common/efi/boot.c
 create mode 100644 xen/common/efi/check.c
 create mode 100644 xen/common/efi/dummy.c
 create mode 100644 xen/common/efi/efi.h
 create mode 100644 xen/common/libfdt/fdt_empty_tree.c
 create mode 100644 xen/include/asm-arm/arm64/efibind.h
 create mode 100644 xen/include/asm-arm/efi-boot.h
 create mode 100644 xen/include/asm-arm/efi.h
 create mode 100644 xen/include/asm-arm/efibind.h
 create mode 100644 xen/include/asm-x86/efi-boot.h
 create mode 100644 xen/include/asm-x86/efi.h


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