Fixed double fault handler. Personally I disclaim all responsiblity

for these changes. I was mostly just staring in amazement at the screen
while Axel and Thomas were discussing IA32 internals. A particularly
fascinating moment was when Thomas produced the cause of a bug we had
been trying to track down for hours off the top of his head (of course
iret behaves specially when the NT bit is set :-). His slowness must be
excused though, since he hadn't slept for more then 30 hours. ;-)

The code doesn't wholeheartedly deal with multi-processor machines yet.
Axel will certainly do some cleanup...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12239 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/x86/descriptors.h

@@ -17,8 +17,8 @@
 	// this file can also be included from assembler as well
 	// (and is in arch_interrupts.S)
 
-#define DOUBLE_FAULT_TSS_SEGMENT 5
-#define TSS_BASE_SEGMENT 6
+#define DOUBLE_FAULT_TSS_BASE_SEGMENT 5
+#define TSS_BASE_SEGMENT (DOUBLE_FAULT_TSS_BASE_SEGMENT + smp_get_num_cpus())
 #define TLS_BASE_SEGMENT (TSS_BASE_SEGMENT + smp_get_num_cpus())
 
 
@@ -125,7 +125,7 @@ set_tss_descriptor(struct segment_descriptor *desc, addr_t base, uint32 limit)
 	desc->privilege_level = DPL_KERNEL;
 
 	desc->present = 1;
-	desc->granularity = 1;	// 4 GB size (in page size steps)
+	desc->granularity = 0;	// 1 Byte granularity
 	desc->available = 0;	// system available bit is currently not used
 	desc->d_b = 0;