rtai_emulate_tsc.h

00001 /*
00002  *   Copyright (C) 2004 Paolo Mantegazza (mantegazza@aero.polimi.it)
00003  *
00004  *   This program is free software; you can redistribute it and/or modify
00005  *   it under the terms of the GNU General Public License as published by
00006  *   the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
00007  *   USA; either version 2 of the License, or (at your option) any later
00008  *   version.
00009  *
00010  *   This program is distributed in the hope that it will be useful,
00011  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *   GNU General Public License for more details.
00014  *
00015  *   You should have received a copy of the GNU General Public License
00016  *   along with this program; if not, write to the Free Software
00017  *   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00018  */
00019 
00020 
00021 //#define EMULATE_TSC  /* to force emulation even if CONFIG_X86_TSC */
00022 
00023 #ifndef _RTAI_ASM_EMULATE_TSC_H
00024 #define _RTAI_ASM_EMULATE_TSC_H
00025 
00026 #if defined(EMULATE_TSC) || !defined(CONFIG_X86_TSC)
00027 
00028 #undef RTAI_CPU_FREQ
00029 #undef RTAI_CALIBRATED_CPU_FREQ
00030 #undef rdtsc
00031 #undef rtai_rdtsc
00032 #undef DECLR_8254_TSC_EMULATION
00033 #undef TICK_8254_TSC_EMULATION
00034 #undef SETUP_8254_TSC_EMULATION
00035 #undef CLEAR_8254_TSC_EMULATION
00036 
00037 #define RTAI_CPU_FREQ             RTAI_FREQ_8254
00038 #define RTAI_CALIBRATED_CPU_FREQ  RTAI_FREQ_8254
00039 #define rtai_rdtsc()              rd_8254_ts()
00040 #define rdtsc()                   rd_8254_ts()
00041 
00042 #define DECLR_8254_TSC_EMULATION \
00043 extern void *kd_mksound; \
00044 static void *linux_mksound; \
00045 static void rtai_mksound(void) { } \
00046 const int TSC_EMULATION_GUARD_FREQ = 20; \
00047 static struct timer_list timer;
00048 
00049 #define TICK_8254_TSC_EMULATION()  rd_8254_ts()
00050 
00051 #define SETUP_8254_TSC_EMULATION \
00052         do { \
00053                 linux_mksound = kd_mksound; \
00054                 kd_mksound = rtai_mksound; \
00055                 rt_setup_8254_tsc(); \
00056                 init_timer(&timer); \
00057                 timer.function = timer_fun; \
00058                 timer_fun(0); \
00059         } while (0)
00060 
00061 #define CLEAR_8254_TSC_EMULATION \
00062         do { \
00063                 del_timer(&timer); \
00064                 if (linux_mksound) { \
00065                         kd_mksound = linux_mksound; \
00066                 } \
00067         } while (0)
00068 
00069 #endif
00070 
00071 #endif /* !_RTAI_ASM_EMULATE_TSC_H */

Generated on Tue Jan 18 22:53:52 2005 for RTAI API by  doxygen 1.3.9.1