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authorAndy Lutomirski <[email protected]>2016-07-21 14:16:51 -0700
committerIngo Molnar <[email protected]>2016-07-22 11:46:01 +0200
commit30f027398b329c75c8f23a3c13be240b50866fdc (patch)
treee5709cc23928e7f7e0e7cda42708187d9b124bc5
parentedce21216a8887bf06ba85ee49a00695e44c4341 (diff)
x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does
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 <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Kees Cook <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luis R. Rodriguez <[email protected]> Cc: Mario Limonciello <[email protected]> Cc: Matthew Garrett <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Toshi Kani <[email protected]> Link: http://lkml.kernel.org/r/55bd591115498440d461857a7b64f349a5d911f3.1469135598.git.luto@kernel.org Signed-off-by: Ingo Molnar <[email protected]>
-rw-r--r--arch/x86/include/asm/x86_init.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index c519c052700a..66c15a01667f 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -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.
*/