kernel-ark/arch/x86/boot
H. Peter Anvin bca23dba76 x86, setup: revert ACPI 3 E820 extended attributes support
Remove ACPI 3 E820 extended memory attributes support.  At least one
vendor actively set all the flags to zero, but left ECX on return at
24.  This bug may be present in other BIOSes.

The breakage functionally means the ACPI 3 flags are probably
completely useless, and that no OS any time soon is going to rely on
their existence.  Therefore, drop support completely.  We may want to
revisit this question in the future, if we find ourselves actually
needing the flags.

This reverts all or part of the following checkins:

     cd670599b7
     c549e71d07

However, retain the part from the latter commit that copies e820 into
a temporary buffer; that is an unrelated BIOS workaround.  Put in a
comment to explain that part.

See https://bugzilla.redhat.com/show_bug.cgi?id=499396 for some
additional information.

[ Impact: detect all memory on affected machines ]

Reported-by: Thomas J. Baker <tjb@unh.edu>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Len Brown <len.brown@intel.com>
Cc: Chuck Ebbert <cebbert@redhat.com>
Cc: Kyle McMartin <kmcmartin@redhat.com>
Cc: Matt Domsch <matt_domsch@dell.com>
2009-05-22 11:14:02 -07:00
..
compressed x86, setup: compile with -DDISABLE_BRANCH_PROFILING 2009-04-03 16:34:45 +02:00
tools x86: remove zImage support 2009-03-11 11:00:00 -07:00
.gitignore Update .gitignore files 2008-04-25 12:27:32 -07:00
a20.c x86: remove the Voyager 32-bit subarch 2009-02-23 00:54:01 +01:00
apm.c x86: remove pointless comments 2008-04-19 19:19:54 +02:00
bitops.h x86: remove pointless comments 2008-04-19 19:19:54 +02:00
boot.h x86: remove the Voyager 32-bit subarch 2009-02-23 00:54:01 +01:00
cmdline.c x86: remove pointless comments 2008-04-19 19:19:54 +02:00
code16gcc.h i386: move boot 2007-10-11 11:16:45 +02:00
copy.S x86: copy.S - use GLOBAL,ENDPROC macros 2009-02-19 17:13:00 +01:00
cpu.c x86 setup: handle more than 8 CPU flag words 2008-09-16 15:09:26 -07:00
cpucheck.c x86: boot: stub out unimplemented CPU feature words 2008-09-05 16:13:44 -07:00
edd.c Revert "x86: fix ghost EDD devices in /sys again" 2008-10-03 10:22:33 -07:00
header.S x86: remove zImage support 2009-03-11 11:00:00 -07:00
install.sh x86: remove pointless comments 2008-04-19 19:19:54 +02:00
main.c x86: remove the Voyager 32-bit subarch 2009-02-23 00:54:01 +01:00
Makefile x86, setup: compile with -DDISABLE_BRANCH_PROFILING 2009-04-03 16:34:45 +02:00
mca.c x86: remove pointless comments 2008-04-19 19:19:54 +02:00
memory.c x86, setup: revert ACPI 3 E820 extended attributes support 2009-05-22 11:14:02 -07:00
mkcpustr.c x86 setup: handle more than 8 CPU flag words 2008-09-16 15:09:26 -07:00
mtools.conf.in i386: move boot 2007-10-11 11:16:45 +02:00
pm.c x86: remove zImage support 2009-03-11 11:00:00 -07:00
pmjump.S x86, setup: move 32-bit code to .text32 2009-03-17 15:26:06 -07:00
printf.c x86: boot/printfc use NULL instead 0 2008-05-25 08:58:25 +02:00
setup.ld x86, setup: move 32-bit code to .text32 2009-03-17 15:26:06 -07:00
string.c x86: remove pointless comments 2008-04-19 19:19:54 +02:00
tty.c x86: use limited register constraint for setnz 2008-11-25 15:38:03 +01:00
version.c x86: remove pointless comments 2008-04-19 19:19:54 +02:00
vesa.h x86-boot: don't request VBE2 information 2008-03-07 16:39:14 +01:00
video-bios.c x86: make variables static 2008-10-22 07:31:28 +02:00
video-mode.c x86: move suspend wakeup code to C 2008-04-17 17:41:37 +02:00
video-vesa.c x86 setup: fix asm constraints in vesa_store_edid 2009-01-30 23:55:25 +01:00
video-vga.c x86, setup: un-resequence mode setting for VGA 80x34 and 80x60 modes 2009-04-07 10:59:25 -07:00
video.c x86: boot - fix sparse warnings 2008-11-23 19:58:58 +01:00
video.h x86: remove pointless comments 2008-04-19 19:19:54 +02:00