[PATCH v4 0/5] efi: Implement generic EFI boot for x86

[Ard Biesheuvel]

Switch the i386-efi and x86_64-efi builds to the generic EFI loader,
which enters the Linux kernel via the EFI stub and provides the initrd
via the LoadFile2 protocol. This unifies x86 with other EFI
architectures, and removes the dependency on the setup header and struct
bootparams.

Do some preparatory cleanup first, so we no longer need to rely on the
MS to SysV calling convention translation code.

Changes since v3:
- add missing efiapi annotations to efiemu routines
- work around dead code warning from Coverity by making unnecessary
  changes to the initrd loading logic in the generic EFI loader

Changes since v2:
- rebase onto latest master, which has the Loongarch changes
- retain Itanium support for now
- simplify the fallback logic - attempt to load the image as usual, and
  fallback on failure or if the image does not implement LoadFile2

Changes since v1:
- drop Itanium support, which is a maintenance burden as it shares the
  EFI code with other architectures, but does not have a EFI stub in
  Linux, and there is no way to test whether our changes break the boot
  for it or not;
- enable generic EFI for i386 as well
- wire up the existing x86 code as a fallback for kernels that lack EFI
  stub or LoadFile2 support. This removes the need for additional
  changes to support v5.8 or older kernels.

Cc: Daniel Kiper <daniel.kiper@oracle.com>
Cc: Glenn Washburn <development@efficientek.com>

Ard Biesheuvel (5):
  efi: Make EFI PXE protocol methods non-callable
  efi: Add calling convention annotation to all prototypes
  efi: Drop all uses of efi_call_XX wrappers
  efi: Remove x86_64 call wrappers
  efi: Use generic EFI loader for x86_64 and i386

 grub-core/Makefile.core.def           |   3 +-
 grub-core/commands/acpi.c             |   8 +-
 grub-core/commands/efi/efitextmode.c  |   8 +-
 grub-core/commands/efi/lsefi.c        |   5 +-
 grub-core/commands/efi/tpm.c          |  21 +-
 grub-core/disk/efi/efidisk.c          |   7 +-
 grub-core/efiemu/runtime/efiemu.c     |  48 +-
 grub-core/kern/arm/efi/init.c         |  12 +-
 grub-core/kern/efi/efi.c              |  56 +-
 grub-core/kern/efi/init.c             |  15 +-
 grub-core/kern/efi/mm.c               |  17 +-
 grub-core/kern/i386/efi/tsc.c         |   2 +-
 grub-core/kern/ia64/efi/init.c        |  14 +-
 grub-core/kern/loongarch64/efi/init.c |  10 +-
 grub-core/kern/x86_64/efi/callwrap.S  | 129 ----
 grub-core/lib/efi/datetime.c          |   9 +-
 grub-core/lib/efi/halt.c              |   4 +-
 grub-core/lib/efi/relocator.c         |   6 +-
 grub-core/loader/efi/appleloader.c    |   8 +-
 grub-core/loader/efi/chainloader.c    |  20 +-
 grub-core/loader/efi/linux.c          |  47 +-
 grub-core/loader/i386/linux.c         |   8 +
 grub-core/mmap/efi/mmap.c             |  16 +-
 grub-core/net/drivers/efi/efinet.c    |  26 +-
 grub-core/term/efi/console.c          |  29 +-
 grub-core/term/efi/serial.c           |  18 +-
 grub-core/video/efi_gop.c             |  18 +-
 grub-core/video/efi_uga.c             |   8 +-
 include/grub/efi/api.h                | 666 +++++++++-----------
 include/grub/efi/efi.h                |   2 +-
 include/grub/efi/tpm.h                | 149 +++--
 31 files changed, 628 insertions(+), 761 deletions(-)
 delete mode 100644 grub-core/kern/x86_64/efi/callwrap.S

-- 
2.39.2