efi: Expose underlying UEFI firmware platform size to userland

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In some cases (e.g. Intel Bay Trail machines), the kernel will happily
run in 64-bit even if the underlying UEFI firmware platform is
32-bit. That's great, but it's difficult for userland utilities like
grub-install to do the right thing in such a situation.

The kernel already knows about the size of the firmware via
efi_enabled(EFI_64BIT). Add an extra sysfs interface
/sys/firmware/efi/fw_platform_size to expose that information to
userland for low-level utilities to use.

Signed-off-by: Steve McIntyre <steve@einval.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

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Steve McIntyre 2015-01-09 15:29:53 +00:00 • committed by Matt Fleming

parent 17473c32ce

commit 2859dff97e

1 changed files with 9 additions and 0 deletions

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drivers/firmware/efi/efi.c

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