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(CPU_Get_timebase_low, rtems_bsp_delay, rtems_bsp_delay_in_bus_cycles): New.

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This commit is contained in:
Ralf Corsepius
2005-02-15 14:29:40 +00:00
parent fe3af4cce5
commit e6cea8899f
1 changed files with 30 additions and 0 deletions
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30
cpukit/score/cpu/powerpc/rtems/score/cpu.h
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@@ -115,5 +115,35 @@ static inline uint32_t CPU_swap_u32(
#endif /* ASM */
#ifndef /* ASM */
/*
* Simple spin delay in microsecond units for device drivers.
* This is very dependent on the clock speed of the target.
*/
#define CPU_Get_timebase_low( _value ) \
asm volatile( "mftb %0" : "=r" (_value) )
#define rtems_bsp_delay( _microseconds ) \
do { \
uint32_t start, ticks, now; \
CPU_Get_timebase_low( start ) ; \
ticks = (_microseconds) * rtems_cpu_configuration_get_clicks_per_usec(); \
do \
CPU_Get_timebase_low( now ) ; \
while (now - start < ticks); \
} while (0)
#define rtems_bsp_delay_in_bus_cycles( _cycles ) \
do { \
uint32_t start, now; \
CPU_Get_timebase_low( start ); \
do \
CPU_Get_timebase_low( now ); \
while (now - start < (_cycles)); \
} while (0)
#endif /* ASM */
#endif /* _RTEMS_SCORE_CPU_H */