[RFC 0/3] Add/use helper functions for finding UEFI config tables

[Leif Lindholm <leif.lindholm@linaro.org>]

(Triggered by Alex's recent patches)

There are a few places in the code manually iterating across the
config tables provided through the UEFI system table. This set
implements a common search function and converts some existing
functions to use it.

I have not yet converted commands/efi/loadbios.c given that it
searches for multiple things in one go. Would be a trivial change.

Also, for cleanliness of call-sites a better approach may be to macroize
the function so that it was possible to simply go:
  ptr = grub_efi_find_config_table(MY_VERY_SPECIAL_GUID);
This was not my preference, since that hides the fact that the
underlying datatype is a 128-bit struct.

Leif Lindholm (3):
  efi: add configuration table search function
  arm64 linux loader: use grub_efi_find_config_table to find DT
  acpi: use grub_efi_find_config_table to find tables

 grub-core/kern/efi/acpi.c    | 28 ++++------------------------
 grub-core/kern/efi/efi.c     | 18 ++++++++++++++++++
 grub-core/loader/arm64/fdt.c | 16 +---------------
 include/grub/efi/efi.h       |  3 +++
 4 files changed, 26 insertions(+), 39 deletions(-)

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2.1.4