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x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does

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It doesn't just control probing for the EBDA -- it controls whether we
detect and reserve the <1MB BIOS regions in general.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Mario Limonciello <mario_limonciello@dell.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Link: http://lkml.kernel.org/r/55bd591115498440d461857a7b64f349a5d911f3.1469135598.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2016-07-21 14:16:51 -07:00 committed by Ingo Molnar
parent edce21216a
commit 30f027398b
1 changed files with 3 additions and 2 deletions
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5
arch/x86/include/asm/x86_init.h
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@ -168,8 +168,9 @@ struct x86_legacy_devices {
* struct x86_legacy_features - legacy x86 features
*
* @rtc: this device has a CMOS real-time clock present
* @reserve_bios_regions: it's safe to search for the EBDA signature in the hardware's
* low RAM
* @reserve_bios_regions: boot code will search for the EBDA address and the
* start of the 640k - 1M BIOS region. If false, the platform must
* ensure that its memory map correctly reserves sub-1MB regions as needed.
* @devices: legacy x86 devices, refer to struct x86_legacy_devices
* documentation for further details.
*/