efi/x86: Remove GDT setup from efi_main

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The 64-bit kernel will already load a GDT in startup_64, which is the
next function to execute after return from efi_main.

Add GDT setup code to the 32-bit kernel's startup_32 as well. Doing it
in the head code has the advantage that we can avoid potentially
corrupting the GDT during copy/decompression. This also removes
dependence on having a specific GDT layout setup by the bootloader.

Both startup_32 and startup_64 now clear interrupts on entry, so we can
remove that from efi_main as well.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200202171353.3736319-6-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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This commit is contained in:

Arvind Sankar 2020-02-02 12:13:51 -05:00 • committed by Ard Biesheuvel

parent cae0e431a0

commit ef5a7b5eb1

2 changed files with 34 additions and 109 deletions

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103

arch/x86/boot/compressed/eboot.c

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40

arch/x86/boot/compressed/head_32.S

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