Displaying 9 results from an estimated 9 matches for "segment_is_flat_cod".
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segment_is_flat_code
2007 Apr 18
2
[patch 3/8] Allow a kernel to not be in ring 0.
..._segment_
}
/* The standard kernel/user address space limit. */
- *eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg;
+ *eip_limit = user_mode(regs) ? USER_DS.seg : KERNEL_DS.seg;
/* By far the most common cases. */
- if (likely(seg == __USER_CS || seg == __KERNEL_CS))
+ if (likely(SEGMENT_IS_FLAT_CODE(seg)))
return eip;
/* Check the segment exists, is within the current LDT/GDT size,
@@ -436,11 +437,7 @@ good_area:
write = 0;
switch (error_code & 3) {
default: /* 3: write, present */
-#ifdef TEST_VERIFY_AREA
- if (regs->cs == KERNEL_CS)
- printk("WP fault at %08lx...
2007 Apr 18
2
[patch 3/8] Allow a kernel to not be in ring 0.
..._segment_
}
/* The standard kernel/user address space limit. */
- *eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg;
+ *eip_limit = user_mode(regs) ? USER_DS.seg : KERNEL_DS.seg;
/* By far the most common cases. */
- if (likely(seg == __USER_CS || seg == __KERNEL_CS))
+ if (likely(SEGMENT_IS_FLAT_CODE(seg)))
return eip;
/* Check the segment exists, is within the current LDT/GDT size,
@@ -436,11 +437,7 @@ good_area:
write = 0;
switch (error_code & 3) {
default: /* 3: write, present */
-#ifdef TEST_VERIFY_AREA
- if (regs->cs == KERNEL_CS)
- printk("WP fault at %08lx...
2007 Apr 18
0
Cleaning up descriptor patch
...RPL off and combines the segments together to test for faults
before setting the pnp_bios_is_utter_crap variable. In this case, we
can simply test:
if (likely((seg & 0xe8) == __KERNEL_CS)
and be done with any RPL masking at all. Perhaps this is best put in a
macro in segment.h,
#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xe8) == GDT_ENTRY_KERNEL_CS * 8)
Also, note the segment check for PnP faults is broken, as it masks off
the TI bit, thus returning false positives for LDT entries (which are
fortunately unused by the kernel).
Zach
2007 Apr 18
1
[PATCH] Slight cleanups for x86 ring macros (against rc3-mm2)
...Aug 07 13:30:17 2006 +1000
+++ b/include/asm-i386/segment.h Mon Aug 07 14:32:11 2006 +1000
@@ -83,10 +83,9 @@
#define GDT_SIZE (GDT_ENTRIES * 8)
-/*
- * Some tricky tests to match code segments after a fault
- */
+/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)
+/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)
/* Simple and small GDT entries for booting only */
@@ -118,8 +117,16 @@
*/
#define IDT_ENTRIES...
2007 Apr 18
1
[PATCH] Slight cleanups for x86 ring macros (against rc3-mm2)
...Aug 07 13:30:17 2006 +1000
+++ b/include/asm-i386/segment.h Mon Aug 07 14:32:11 2006 +1000
@@ -83,10 +83,9 @@
#define GDT_SIZE (GDT_ENTRIES * 8)
-/*
- * Some tricky tests to match code segments after a fault
- */
+/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)
+/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)
/* Simple and small GDT entries for booting only */
@@ -118,8 +117,16 @@
*/
#define IDT_ENTRIES...
2007 Apr 18
8
[patch 0/8] Basic infrastructure patches for a paravirtualized kernel
Hi Andrew,
This series of patches lays the basic ground work for the
paravirtualized kernel patches coming later on. I think this lot is
ready for the rough-and-tumble world of the -mm tree.
The main change from the last posting is that all the page-table
related patches have been moved out, and will be posted separately.
Also, the off-by-one in reserving the top of address space has been
2007 Apr 18
8
[patch 0/8] Basic infrastructure patches for a paravirtualized kernel
Hi Andrew,
This series of patches lays the basic ground work for the
paravirtualized kernel patches coming later on. I think this lot is
ready for the rough-and-tumble world of the -mm tree.
The main change from the last posting is that all the page-table
related patches have been moved out, and will be posted separately.
Also, the off-by-one in reserving the top of address space has been
2007 Apr 18
15
[PATCH 0 of 13] Basic infrastructure patches for a paravirtualized kernel
[ REPOST: Apologies to anyone who has seen this before. It
didn't make it onto any of the lists it should have. -J ]
Hi Andrew,
This series of patches lays the basic ground work for the
paravirtualized kernel patches coming later on. I think this lot is
ready for the rough-and-tumble world of the -mm tree.
For the most part, these patches do nothing or very little. The
patches should
2007 Apr 18
15
[PATCH 0 of 13] Basic infrastructure patches for a paravirtualized kernel
[ REPOST: Apologies to anyone who has seen this before. It
didn't make it onto any of the lists it should have. -J ]
Hi Andrew,
This series of patches lays the basic ground work for the
paravirtualized kernel patches coming later on. I think this lot is
ready for the rough-and-tumble world of the -mm tree.
For the most part, these patches do nothing or very little. The
patches should