x86/boot: Remove KEEP_SEGMENTS support
Commit a24e785111a3 ("i386: paravirt boot sequence") added this flag for
use by paravirtualized environments such as Xen. However, Xen never made
use of this flag [1], and it was only ever used by lguest [2].
Commit ecda85e70277 ("x86/lguest: Remove lguest support") removed
lguest, so KEEP_SEGMENTS has lost its last user.
[1] https://lore.kernel.org/lkml/4D4B097C.5050405@goop.org
[2] https://www.mail-archive.com/lguest@lists.ozlabs.org/msg00469.html
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200202171353.3736319-2-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst
index c9c2015..fa7ddc0 100644
--- a/Documentation/x86/boot.rst
+++ b/Documentation/x86/boot.rst
@@ -490,15 +490,11 @@
kernel) to not write early messages that require
accessing the display hardware directly.
- Bit 6 (write): KEEP_SEGMENTS
+ Bit 6 (obsolete): KEEP_SEGMENTS
Protocol: 2.07+
- - If 0, reload the segment registers in the 32bit entry point.
- - If 1, do not reload the segment registers in the 32bit entry point.
-
- Assume that %cs %ds %ss %es are all set to flat segments with
- a base of 0 (or the equivalent for their environment).
+ - This flag is obsolete.
Bit 7 (write): CAN_USE_HEAP