linux/arch
Alok Kataria 63d38198a0 x86: fix paranoia about using BIOS quickboot mechanism.
> > Make sure that we clear the "shutdown status flag" in the CMOS
> > register after each CPU is brought up.  This fixes a problem where the
> > "shutdown status flag" may remain set when a CPU is brought up after
> > booting.
>
> btw., what problem does this result in, exactly?

The shutdown status flag set to "0xA", corresponds to "JMP double word
request without INT init".

This JMP at reboot time is at an unintended location. And results in
Triple faults in our case.
Though this error at reboot can be safely ignored in a VM environment,
am not sure what the effect would be on a physical system. May be it
will result in a triple fault and an eventual hardware reset thus
masking this BUG in the kernel.

This fix just makes sure that we reset that status flag after
initialization is done.

Fix paranoia about using BIOS quickboot mechanism.

Make sure that we clear the "shutdown status flag" in the CMOS register
after each CPU is brought up.  This fixes a problem where the "shutdown
status flag" may remain set when a CPU is brought up after booting.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: Dan Arai <arai@vmware.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17 17:41:36 +02:00
..
alpha alpha: fix ALSA DMA mmap crash 2008-04-02 15:28:19 -07:00
arm [ARM] 4873/1: Fix ITE 8152 interrupt demux 2008-03-28 15:07:46 +00:00
avr32 avr32 mustn't select HAVE_IDE 2008-04-17 01:14:32 +02:00
blackfin [Blackfin] arch: fix atomic and32/xor32 comments and ENDPROC markings 2008-03-03 17:44:14 -07:00
cris cris: correct usage of __user for copy to and from user space in lib/usercopy and uaccess.h 2008-03-04 16:35:16 -08:00
frv FRV: Correctly determine the address of an illegal instruction 2008-04-14 07:55:15 -07:00
h8300 h8300: defconfig update 2008-02-23 17:12:16 -08:00
ia64 acpi: unneccessary to scan the PCI bus already scanned 2008-04-15 19:35:41 -07:00
m32r ide: introduce HAVE_IDE 2008-02-09 10:46:40 +01:00
m68k m68k: update defconfigs for 2.6.25 2008-04-04 14:42:30 -07:00
m68knommu m68k{,nommu}: Wire up new timerfd syscalls 2008-03-04 08:04:11 -08:00
mips Pb1200/DBAu1200: fix bad IDE resource size 2008-04-17 01:14:33 +02:00
mn10300 MN10300: define HZ as a config option 2008-02-23 17:12:13 -08:00
parisc [PARISC] fix signal trampoline cache flushing 2008-04-15 15:51:36 -07:00
powerpc [POWERPC] Fix MPC5200 (not B!) device tree so FEC ethernet works 2008-04-03 22:11:12 +11:00
ppc [PPC] 8xx: swap bug-fix 2008-03-07 16:56:54 -06:00
s390 [S390] futex: let futex_atomic_cmpxchg_pt survive early functional tests. 2008-03-20 17:33:46 +01:00
sh sh: export empty_zero_page 2008-04-16 02:21:47 +09:00
sparc [SPARC]: Fix several regset and ptrace bugs. 2008-04-09 19:39:25 -07:00
sparc64 [SPARC]: Fix several regset and ptrace bugs. 2008-04-09 19:39:25 -07:00
um [UML]: uml-net: don't set IFF_ALLMULTI in set_multicast_list 2008-03-26 00:16:29 -07:00
v850 ide: introduce HAVE_IDE 2008-02-09 10:46:40 +01:00
x86 x86: fix paranoia about using BIOS quickboot mechanism. 2008-04-17 17:41:36 +02:00
xtensa [XTENSA] Allow debugger to modify the WINDOWBASE register. 2008-02-13 17:45:36 -08:00
.gitignore arch: Ignore arch/i386 and arch/x86_64 2008-01-19 21:29:39 -08:00
Kconfig Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00