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  1. 20 3月, 2014 1 次提交
    • V
      x86, boot: Create a separate string.h file to provide standard string functions · c041b5ad
      由 Vivek Goyal 提交于 
      Create a separate arch/x86/boot/string.h file to provide declaration of
some of the common string functions.

By default memcpy, memset and memcmp functions will default to gcc
builtin functions. If code wants to use an optimized version of any
of these functions, they need to #undef the respective macro and link
against a local file providing definition of undefed function.

For example, arch/x86/boot/* code links against copy.S to get memcpy()
and memcmp() definitions. arch/86/boot/compressed/* links against
compressed/string.c.

There are quite a few places in arch/x86/ where these functions are
used. Idea is to try to consilidate  their declaration and possibly
definitions so that it can be reused.

I am planning to reuse boot/string.h in arch/x86/purgatory/ and use
gcc builtin functions for memcpy, memset and memcmp.
Signed-off-by: NVivek Goyal <vgoyal@redhat.com>
Link: http://lkml.kernel.org/r/1395170800-11059-3-git-send-email-vgoyal@redhat.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
      c041b5ad
  3. 10 4月, 2009 1 次提交
  5. 04 10月, 2008 2 次提交
  7. 06 9月, 2008 1 次提交
    • A
      x86: fix ghost EDD devices in /sys again · 464f04c9
      由 Andrey Borzenkov 提交于 
      > This is regression but old enough. Apparently I had for whatever reasons
> EDD turned off till recently. This is 2.6.27-rc5 just in case.
>
> In 2006 I fixed ghost devices due to buggy BIOS:
>
> http://marc.info/?l=linux-kernel&m=114087765422490&w=2
>
> Later edd.S has been rewritten in C, and apparently this patch has been
> lost:
>
> {pts/1}% ls /sys/firmware/edd
> int13_dev80/  int13_dev84/  int13_dev88/  int13_dev8c/
> int13_dev81/  int13_dev85/  int13_dev89/  int13_dev8d/
> int13_dev82/  int13_dev86/  int13_dev8a/  int13_dev8e/
> int13_dev83/  int13_dev87/  int13_dev8b/  int13_dev8f/
>
> But I have just a single disk. This is the same system BTW.

Some BIOSes do not always set CF on error before return from int13.
The patch adds additional check for status being zero (AH == 0).

This was fixed for edd.S in
http://marc.info/?l=linux-kernel&m=114087765422490&w=2, but lost
again when edd.S was rewritten in C.
Signed-off-by: NAndrey Borzenkov <arvidjaar@mail.ru>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      464f04c9
  9. 19 7月, 2008 1 次提交
  11. 29 4月, 2008 1 次提交
  13. 20 4月, 2008 1 次提交
  15. 30 1月, 2008 3 次提交
  17. 11 10月, 2007 1 次提交
  19. 24 8月, 2007 1 次提交
    • H
      [x86 setup] Volatilize asm() statements · b015124e
      由 H. Peter Anvin 提交于 
      asm() statements need to be volatile when:

a. They have side effects (other than value returned).
b. When the value returned can vary over time.
c. When they have ordering constraints that cannot be expressed to gcc.

In particular, the keyboard and timer reads were violating constraint (b),
which resulted in the keyboard/timeout poll getting
loop-invariant-removed when compiling with gcc 4.2.0.

Thanks to an anonymous bug reporter for pointing this out.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      b015124e
  21. 15 8月, 2007 2 次提交
    • H
      [x86 setup] edd.c: make sure MBR signatures actually get reported · 9a5f35d4
      由 H. Peter Anvin 提交于 
      When filling in the MBR signature array, the setup code failed to advance
boot_params.edd_mbr_sig_buf_entries, which resulted in the valid data
being ignored.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      9a5f35d4
    • H
      [x86 setup] Don't use EDD to get the MBR signature · c1a6e2b0
      由 H. Peter Anvin 提交于 
      At least one machine has been identified in the field which advertises
EDD for all drives but locks up if one attempts an extended read from
a non-primary drive.

The MBR is always at CHS 0-0-1, so there is no reason to use an
extended read, other than the possibility that the BIOS cannot handle
it.

Although this might break as many machines as it fixes (a small number
either way), the current state is a regression but the reverse is not.
Therefore revert to the previous state of not using extended read.

Quite probably the Right Thing to do is to read using plain (CHS) read
and extended read on failure, but that change would definitely have to
go through -mm first.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      c1a6e2b0
  23. 03 8月, 2007 1 次提交
  25. 01 8月, 2007 1 次提交
  27. 13 7月, 2007 1 次提交