1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Philip Blundell <philb@gnu.org>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #define _PT_MACHINE_H 1
26 #include <l4/util/atomic.h>
28 /* This will not work on ARM1 or ARM2 because SWP is lacking on those
29 machines. Unfortunately we have no way to detect this at compile
30 time; let's hope nobody tries to use one. */
32 /* Spinlock implementation; required. */
34 testandset (int *spinlock)
36 register unsigned int ret;
38 __asm__ __volatile__("swp %0, %1, [%2]"
40 : "0"(1), "r"(spinlock));
46 /* Get some notion of the current stack. Need not be exactly the top
47 of the stack, just something somewhere in the current frame. */
48 #define CURRENT_STACK_FRAME stack_pointer
49 register char * stack_pointer __asm__ ("sp");
51 /* Compare-and-swap for semaphores. It's always available on i686. */
52 #define HAS_COMPARE_AND_SWAP
55 __compare_and_swap (long int *p, long int oldval, long int newval)
56 { return l4util_cmpxchg32((l4_uint32_t*)p,oldval,newval); }
58 #endif /* pt-machine.h */