efi: Clean up the efi_call_phys_[prolog|epilog]() save/restore interaction

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Currently x86-64 efi_call_phys_prolog() saves into a global variable (save_pgd),
and efi_call_phys_epilog() restores the kernel pagetables from that global
variable.

Change this to a cleaner save/restore pattern where the saving function returns
the saved object and the restore function restores that.

Apply the same concept to the 32-bit code as well.

Plus this approach, as an added bonus, allows us to express the
!efi_enabled(EFI_OLD_MEMMAP) situation in a clean fashion as well,
via a 'NULL' return value.

Cc: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

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This commit is contained in:

Ingo Molnar 2015-03-03 07:48:50 +01:00 • committed by Matt Fleming

parent 23a0d4e8fa

commit 744937b0b1

4 changed files with 31 additions and 17 deletions

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6

arch/x86/include/asm/efi.h

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5

arch/x86/platform/efi/efi.c

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11

arch/x86/platform/efi/efi_32.c

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26

arch/x86/platform/efi/efi_64.c

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