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/arch_cpu.h

@@ -75,6 +75,8 @@ void i386_fxrstor(const void *fpu_state);
 void i386_fsave_swap(void *old_fpu_state, const void *new_fpu_state);
 void i386_fxsave_swap(void *old_fpu_state, const void *new_fpu_state);
 void x86_set_task_gate(int32 n, int32 segment);
+struct tss *x86_get_main_tss(void);
+
 
 #define read_ebp(value) \
 	__asm__("movl	%%ebp,%0" : "=r" (value))

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;
 

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

@@ -5,8 +5,10 @@
 #ifndef _NEWOS_KERNEL_ARCH_I386_FAULTS
 #define _NEWOS_KERNEL_ARCH_I386_FAULTS
 
+struct iframe;
+
 int i386_general_protection_fault(int errorcode);
-int i386_double_fault(int errorcode);
+int i386_double_fault(struct iframe *frame);
 
 #endif
 

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

@@ -6,12 +6,14 @@
 #define _NEWOS_KERNEL_ARCH_I386_INTERRUPTS_H
 
 void trap0();void trap1();void trap2();void trap3();void trap4();void trap5();
-void trap6();void trap7();void trap8();void trap9();void trap10();void trap11();
+void trap6();void trap7();void trap9();void trap10();void trap11();
 void trap12();void trap13();void trap14();void trap16();void trap17();void trap18();
 void trap32();void trap33();void trap34();void trap35();void trap36();void trap37();
 void trap38();void trap39();void trap40();void trap41();void trap42();void trap43();
 void trap44();void trap45();void trap46();void trap47();
 
+void double_fault();	// int 8
+
 void trap99();
 
 void trap251();void trap252();void trap253();void trap254();void trap255();