Xenomai  3.0.8
tsc.h
1 /*
2  * Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
17  */
18 #ifndef _LIB_COBALT_POWERPC_TSC_H
19 #define _LIB_COBALT_POWERPC_TSC_H
20 
21 static inline unsigned long long cobalt_read_tsc(void)
22 {
23 #if defined(__powerpc64__)
24  unsigned long long t;
25 
26  __asm__ __volatile__("mftb %0\n":"=r"(t));
27  return t;
28 #else /* !__powerpc64__ */
29  union {
30  unsigned long long t;
31  unsigned long v[2];
32  } u;
33  unsigned long __tbu;
34 
35  __asm__ __volatile__("1: mfspr %0,269\n"
36  "mfspr %1,268\n"
37  "mfspr %2,269\n"
38  "cmpw %2,%0\n"
39  "bne- 1b\n":"=r"(u.v[0]),
40  "=r"(u.v[1]), "=r"(__tbu));
41  return u.t;
42 #endif /* __powerpc64__ */
43 }
44 
45 #endif /* !_LIB_COBALT_POWERPC_TSC_H */