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| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-02-02 12:13:47 -0500 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-02-22 23:37:37 +0100 |
| commit | 67a6af7ad1d161dbc9c139e868d5549e632923f7 (patch) | |
| tree | 8de615eaa7de8d0a465c5738418ef6eb3f42ec4d /Documentation/x86 | |
| parent | 9f9223778ef385e79dc67f5ee48ee4c1fb757f6b (diff) | |
| download | lwn-67a6af7ad1d161dbc9c139e868d5549e632923f7.tar.gz lwn-67a6af7ad1d161dbc9c139e868d5549e632923f7.zip | |
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>
Diffstat (limited to 'Documentation/x86')
| -rw-r--r-- | Documentation/x86/boot.rst | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst index c9c201596c3e..fa7ddc0428c8 100644 --- a/Documentation/x86/boot.rst +++ b/Documentation/x86/boot.rst @@ -490,15 +490,11 @@ Protocol: 2.00+ 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 + - This flag is obsolete.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 |