* Added support for setting (hardware) break-/watchpoints in the kernel.

Can be enabled by defining KERNEL_BREAKPOINTS in arch/user_debugger.h
  and will provide the arch_{set,clear}_kernel_{break,watch}point()
  function. Hitting a break-/watchpoint will throw the thread into KDL.
* Finally added a comment, what's the point of
  i386_reinit_user_debug_after_context_switch(), since I wonder every
  time I see it. Should be optimized aways soon.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22150 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/user_debugger.h

@@ -11,6 +11,9 @@
 extern "C" {
 #endif
 
+// Enable this to get support for kernel breakpoints.
+//#define KERNEL_BREAKPOINTS 1
+
 struct arch_team_debug_info;
 struct arch_thread_debug_info;
 
@@ -27,6 +30,13 @@ status_t arch_clear_breakpoint(void *address);
 status_t arch_set_watchpoint(void *address, uint32 type, int32 length);
 status_t arch_clear_watchpoint(void *address);
 
+#if KERNEL_BREAKPOINTS
+status_t arch_set_kernel_breakpoint(void *address);
+status_t arch_clear_kernel_breakpoint(void *address);
+status_t arch_set_kernel_watchpoint(void *address, uint32 type, int32 length);
+status_t arch_clear_kernel_watchpoint(void *address);
+#endif
+
 #ifdef __cplusplus
 }
 #endif