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x86/boot: Clear direction and interrupt flags in startup_64

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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>
This commit is contained in:
Arvind Sankar 2020-02-02 12:13:50 -05:00 committed by Ard Biesheuvel
parent 32d009137a
commit cae0e431a0
1 changed files with 3 additions and 0 deletions
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arch/x86/boot/compressed/head_64.S
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@ -264,6 +264,9 @@ SYM_CODE_START(startup_64)
* and command line.
*/
cld
cli
/* Setup data segments. */
xorl %eax, %eax
movl %eax, %ds