linux/arch
Rusty Russell 78be3706b2 [PATCH] i386: Allow a kernel not to be in ring 0
We allow for the fact that the guest kernel may not run in ring 0.  This
requires some abstraction in a few places when setting %cs or checking
privilege level (user vs kernel).

This is Chris' [RFC PATCH 15/33] move segment checks to subarch, except rather
than using #define USER_MODE_MASK which depends on a config option, we use
Zach's more flexible approach of assuming ring 3 == userspace.  I also used
"get_kernel_rpl()" over "get_kernel_cs()" because I think it reads better in
the code...

1) Remove the hardcoded 3 and introduce #define SEGMENT_RPL_MASK 3 2) Add a
get_kernel_rpl() macro, and don't assume it's zero.

And:

Clean up of patch for letting kernel run other than ring 0:

a. Add some comments about the SEGMENT_IS_*_CODE() macros.
b. Add a USER_RPL macro.  (Code was comparing a value to a mask
   in some places and to the magic number 3 in other places.)
c. Add macros for table indicator field and use them.
d. Change the entry.S tests for LDT stack segment to use the macros

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>
2006-09-26 10:52:39 +02:00
..
alpha [PATCH] arch/alpha: Use ARRAY_SIZE macro 2006-07-31 13:28:38 -07:00
arm [ARM] 3794/1: S3C24XX: do not defined set_irq_wake when no CONFIG_PM 2006-09-18 13:30:20 +01:00
arm26 [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
cris [PATCH] pcf8563: remove MOD_INC_USE_COUNT, MOD_DEC_USE_COUNT 2006-07-10 13:24:22 -07:00
frv [PATCH] sanitize frv archclean 2006-09-22 17:48:56 -07:00
h8300 [PATCH] irq-flags: H8300: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
i386 [PATCH] i386: Allow a kernel not to be in ring 0 2006-09-26 10:52:39 +02:00
ia64 [PATCH] cpu to node relationship fixup: map cpu to node 2006-09-25 17:38:36 -07:00
m32r [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
m68k [PATCH] irq-flags: M68K: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
m68knommu [PATCH] irq-flags: M68KNOMMU: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
mips [MIPS] sparsemem: fix crash in show_mem 2006-07-13 21:26:22 +01:00
parisc [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
powerpc [PATCH] more fallout from get_property returning pointer to const 2006-09-23 11:34:43 -07:00
ppc [POWERPC] Fix compile error in sbc8560 2006-09-21 22:59:38 +10:00
s390 [PATCH] x86: Some preparationary cleanup for stack trace 2006-09-26 10:52:34 +02:00
sh Fix 'make headers_check' on sh 2006-09-21 08:36:50 +01:00
sh64 sh64: Add a sane pm_power_off implementation. 2006-09-12 14:40:09 +09:00
sparc [PATCH] sun4: fix sbus_setup_iommu() 2006-09-22 17:48:57 -07:00
sparc64 [SPARC64]: Fix section-mismatch errors in solaris emul module. 2006-09-25 16:39:55 -07:00
um [PATCH] i386: Redo semaphore and rwlock assembly helpers 2006-09-26 10:52:29 +02:00
v850 [PATCH] v850: call init_page_count() instead of set_page_count() 2006-07-31 13:28:38 -07:00
x86_64 [PATCH] Fix a PDA warning uncovered by the new type checking 2006-09-26 10:52:39 +02:00
xtensa [PATCH] xtensa: ptrace: EXIT_ZOMBIE fix 2006-09-01 11:39:08 -07:00