17 May
2015
17 May
'15
10:44 p.m.
On Tue May 12, 2015 at 11:01:13 +0800, watermirror wrote:
hi ,in sys_ipc_wrapper, the code first get the current thread's syscall entry frame: .... Thread *curr=current_thread(); Syscall_frame *f = curr-regs(); ...
according to the Syscall_frame's implemention, it can get the Utcb by Syscall_frame::utcb().
but the following code get the Utcb in another way:
Utcb *utcb = curr->utcb().access(true);
what's the difference between those two Utcb?
Specifying the utcb via the syscall is not used currently, there's just one.
Adam
--
Adam adam@os.inf.tu-dresden.de
Lackorzynski http://os.inf.tu-dresden.de/~adam/