Ported my NewOS changes to OpenBeOS.

A couple of changes in various interrupt and thread functions and structures.
These make it now possible to change the stack at any time without making the kernel crash. This is needed for calling VESA 3.0 VBE functions through the protected mode interface.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@422 a95241bf-73f2-0310-859d-f6bbb57e9c96

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

@@ -7,12 +7,9 @@
 
 /* ??? why include this as we're normally included from that file! */
 #include <arch/cpu.h>
+#include <arch/x86/thread_struct.h>
+#include <arch/x86/descriptors.h>
 
-#define KERNEL_CODE_SEG 0x8
-#define KERNEL_DATA_SEG 0x10
-#define USER_CODE_SEG 0x1b
-#define USER_DATA_SEG 0x23
-#define TSS 0x28
 #define PAGE_SIZE 4096
 
 #define _BIG_ENDIAN 0
@@ -88,7 +85,7 @@ typedef struct pdentry {
 #define nop() __asm__ ("nop"::)
 
 void setup_system_time(unsigned int cv_factor);
-void i386_context_switch(unsigned int **old_esp, unsigned int *new_esp, addr new_pgdir);
+void i386_context_switch(struct arch_thread *old_state, struct arch_thread *new_state, addr new_pgdir);
 void i386_enter_uspace(addr entry, void *args, addr ustack_top);
 void i386_set_kstack(addr kstack);
 void i386_switch_stack_and_call(addr stack, void (*func)(void *), void *arg);