[PATCH V5 00/15] arm64 EFI stub

[Roy Franz <roy.franz@linaro.org>]

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.

Changes since v4:
* Move runtime.c/compat.c/efi.h from arch/x86/efi to common/efi
* Create symbolic links at build time from common/efi to arch/xxx/efi
* Moved all non-VGA video code back to boot.c
* Cleaned up __init in forward declarations, moved declarations to common file
* Fixed type of i in efi_arch_process_memory_map()
* Added early/late arch cfg file functions - arm64 needs early, x86 wants late.
* Added #ifdefs to disable runtime services code that is not yet implemented for
  ARM (code moved back from arch specific file.)
  Global variables are left, as this allows common code setting these in boot
  code to be left.
* just provide arch specific allocator for EFI memory map, not function
  returning the map.
* Renamed truncate_string() to split_string()
* Fixed up MBI static inilization comments in moved code.
* Added explanation of ARM config file ordering requirement to commit message
  and code.
* Added explanation of increase of NR_MEM_BANKS
* Variety of minor formating cleanups.
* Remove mem-reserve regions from DTB in addition to the memory banks.  The EFI
  memory map is the only memory description that is used.

Changes since v3:
* Add symbolic link from common/efi/boot.c to arch/x86/efi/boot.c.  This
  simplifies the build system changes and resolves the parallel build issues
  in v3.  x86 EFI code build is unchanged, and ARM EFI code uses the normal
  common build structure. (This symlink seems to have confused git's moved file
  detection for boot.c)
* Fix XEN to be Xen throughout
* Fix spacing and missing blank lines between functions
* Add pseudo-prototype of efi_xen_start is head.S, change prototype to take
  pointer instead of integer to avoid cast, add comment explaining saving of x0
* Use uintptr_t in casts from uint to pointer for device tree.
* Change alignment requirements to 4k in PE/COFF header and alignment check
  in code.
* Rebased to latest master branch.

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
  version.
* 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 x86 EFI boot/runtime code to common/efi
  Move x86 specific funtions/variables to arch header
  create arch functions to allocate memory for and process EFI memory
    map.
  Add architecture functions for pre/post ExitBootServices
  Add efi_arch_cfg_file_early/late() to handle arch specific cfg file
    fields
  Add efi_arch_handle_cmdline() for processing commandline
  Move x86 specific disk probing code
  Create arch functions for console and video init
  Add efi_arch_memory() for arch specific memory setup
  Add arch specific module handling to read_file()
  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                             |   8 +
 xen/Makefile                           |   1 +
 xen/arch/arm/Makefile                  |   1 +
 xen/arch/arm/arm64/Makefile            |   1 +
 xen/arch/arm/arm64/cache.S             | 100 ++++
 xen/arch/arm/arm64/head.S              | 150 +++++-
 xen/arch/arm/efi/Makefile              |   4 +
 xen/arch/arm/xen.lds.S                 |   1 +
 xen/{arch/x86 => common}/efi/boot.c    | 835 ++++++++-------------------------
 xen/{arch/x86 => common}/efi/compat.c  |   0
 xen/{arch/x86 => common}/efi/efi.h     |   2 -
 xen/{arch/x86 => common}/efi/runtime.c |  15 +-
 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         | 593 +++++++++++++++++++++++
 xen/include/asm-arm/efibind.h          |   2 +
 xen/include/asm-arm/setup.h            |   2 +-
 xen/include/asm-x86/efi-boot.h         | 645 +++++++++++++++++++++++++
 xen/include/xen/libfdt/fdt.h           |  93 +++-
 xen/include/xen/libfdt/libfdt.h        | 315 ++++++++++++-
 xen/include/xen/libfdt/libfdt_env.h    |   4 +
 28 files changed, 2460 insertions(+), 696 deletions(-)
 create mode 100644 xen/arch/arm/arm64/cache.S
 create mode 100644 xen/arch/arm/efi/Makefile
 rename xen/{arch/x86 => common}/efi/boot.c (57%)
 rename xen/{arch/x86 => common}/efi/compat.c (100%)
 rename xen/{arch/x86 => common}/efi/efi.h (95%)
 rename xen/{arch/x86 => common}/efi/runtime.c (98%)
 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/efibind.h
 create mode 100644 xen/include/asm-x86/efi-boot.h

-- 
2.1.0