diff options
Diffstat (limited to 'cpukit/score/cpu/sparc/rtems/score/cpu.h')
-rw-r--r-- | cpukit/score/cpu/sparc/rtems/score/cpu.h | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/cpukit/score/cpu/sparc/rtems/score/cpu.h b/cpukit/score/cpu/sparc/rtems/score/cpu.h index ee6f7136e6..47529c3b9e 100644 --- a/cpukit/score/cpu/sparc/rtems/score/cpu.h +++ b/cpukit/score/cpu/sparc/rtems/score/cpu.h @@ -1273,14 +1273,61 @@ static inline uint32_t CPU_swap_u32( typedef uint32_t CPU_Counter_ticks; -CPU_Counter_ticks _CPU_Counter_read( void ); +typedef CPU_Counter_ticks (*SPARC_Counter_difference)( + CPU_Counter_ticks second, + CPU_Counter_ticks first +); + +/* + * The SPARC processors supported by RTEMS have no built-in CPU counter + * support. We have to use some hardware counter module for this purpose. The + * BSP must provide a 32-bit register which contains the current CPU counter + * value and a function for the difference calculation. It can use for example + * the GPTIMER instance used for the clock driver. + */ +typedef struct { + volatile const CPU_Counter_ticks *counter_register; + SPARC_Counter_difference counter_difference; +} SPARC_Counter; + +extern SPARC_Counter _SPARC_Counter; + +/* + * Returns always a value of one regardless of the parameters. This prevents + * an infinite loop in rtems_counter_delay_ticks(). Its only a reasonably safe + * default. + */ +CPU_Counter_ticks _SPARC_Counter_difference_default( + CPU_Counter_ticks second, + CPU_Counter_ticks first +); + +static inline bool _SPARC_Counter_is_default( void ) +{ + return _SPARC_Counter.counter_difference + == _SPARC_Counter_difference_default; +} + +static inline void _SPARC_Counter_initialize( + volatile const CPU_Counter_ticks *counter_register, + SPARC_Counter_difference counter_difference +) +{ + _SPARC_Counter.counter_register = counter_register; + _SPARC_Counter.counter_difference = counter_difference; +} + +static inline CPU_Counter_ticks _CPU_Counter_read( void ) +{ + return *_SPARC_Counter.counter_register; +} static inline CPU_Counter_ticks _CPU_Counter_difference( CPU_Counter_ticks second, CPU_Counter_ticks first ) { - return second - first; + return (*_SPARC_Counter.counter_difference)( second, first ); } #endif /* ASM */ |