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>
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+ - This flag is obsolete.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
__HEAD
SYM_FUNC_START(startup_32)
cld
- /*
- * Test KEEP_SEGMENTS flag to see if the bootloader is asking
- * us to not reload segments
- */
- testb $KEEP_SEGMENTS, BP_loadflags(%esi)
- jnz 1f
-
cli
movl $__BOOT_DS, %eax
movl %eax, %ds
movl %eax, %fs
movl %eax, %gs
movl %eax, %ss
-1:
/*
* Calculate the delta between where we were compiled to run
* all need to be under the 4G limit.
*/
cld
- /*
- * Test KEEP_SEGMENTS flag to see if the bootloader is asking
- * us to not reload segments
- */
- testb $KEEP_SEGMENTS, BP_loadflags(%esi)
- jnz 1f
-
cli
movl $(__BOOT_DS), %eax
movl %eax, %ds
movl %eax, %es
movl %eax, %ss
-1:
/*
* Calculate the delta between where we were compiled to run
SYM_CODE_START(startup_32)
movl pa(initial_stack),%ecx
- /* test KEEP_SEGMENTS flag to see if the bootloader is asking
- us to not reload segments */
- testb $KEEP_SEGMENTS, BP_loadflags(%esi)
- jnz 2f
-
/*
* Set segments to known values.
*/
movl %eax,%fs
movl %eax,%gs
movl %eax,%ss
-2:
leal -__PAGE_OFFSET(%ecx),%esp
/*