Merged branch haiku/branches/developer/bonefish/optimization revision

23139 into trunk, with roughly the following changes (for details svn
log the branch):
* The int 99 syscall handler is now fully in assembly.
* Added a sysenter/sysexit handler and use it on Pentiums that support
  it (via commpage).
* Got rid of i386_handle_trap(). A bit of functionality was moved into
  the assembly handler which now uses a jump table to call C functions
  handling the respective interrupt.
* Some optimizations to get user debugger support code out of the
  interrupt handling path.
* Introduced a thread::flags fields which allows to skip handling of
  rare events (signals, user debug enabling/disabling) on the
  common interrupt handling path.
* Got rid of the explicit iframe stack. The iframes can still be
  retrieved by iterating through the stack frames.
* Made the commpage an architecture independent feature. It's used for
  the real time data stuff (instead of creating a separate area).
* The x86 CPU modules can now provide processor optimized versions for
  common functions (currently memcpy() only). They are used in the
  kernel and are provided to the userland via commpage entries.
* Introduced build system feature allowing easy use of C structure
  member offsets in assembly code.

Changes after merging:
* Fixed merge conflict in src/system/kernel/arch/x86/arch_debug.cpp
  (caused by refactoring and introduction of "call" debugger command).



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23370 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/thread.h

@@ -26,9 +26,10 @@ struct thread *thread_lookat_queue(struct thread_queue *q);
 struct thread *thread_dequeue(struct thread_queue *q);
 struct thread *thread_dequeue_id(struct thread_queue *q, thread_id id);
 
-void thread_at_kernel_entry(void);
+void thread_at_kernel_entry(bigtime_t now);
 	// called when the thread enters the kernel on behalf of the thread
 void thread_at_kernel_exit(void);
+void thread_at_kernel_exit_no_signals(void);
 void thread_reset_for_exec(void);
 
 status_t thread_init(struct kernel_args *args);
@@ -69,6 +70,8 @@ status_t wait_for_thread_etc(thread_id id, uint32 flags, bigtime_t timeout,
 status_t select_thread(int32 object, struct select_info *info, bool kernel);
 status_t deselect_thread(int32 object, struct select_info *info, bool kernel);
 
+#define syscall_64_bit_return_value() arch_syscall_64_bit_return_value()
+
 // used in syscalls.c
 status_t _user_set_thread_priority(thread_id thread, int32 newPriority);
 status_t _user_rename_thread(thread_id thread, const char *name);