Commit cae0e431 authored Feb 02, 2020 by Arvind Sankar Committed by Ard Biesheuvel Feb 22, 2020

x86/boot: Clear direction and interrupt flags in startup_64



startup_32 already clears these flags on entry, do it in startup_64 as
well for consistency.

The direction flag in particular is not specified to be cleared in the
boot protocol documentation, and we currently call into C code
(paging_prepare) without explicitly clearing it.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200202171353.3736319-5-nivedita@alum.mit.edu


Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

parent 32d00913

arch/x86/boot/compressed/head_64.S

+3 −0

Original line number	Diff line number	Diff line
		@@ -264,6 +264,9 @@ SYM_CODE_START(startup_64)
		* and command line.
		*/

		cld
		cli

		/* Setup data segments. */
		xorl %eax, %eax
		movl %eax, %ds

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