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/*
* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_SPARCIMPL_H
#define _RTEMS_SCORE_SPARCIMPL_H
#include <rtems/score/cpu.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
* Provides a mutable alias to _SPARC_Counter for use in
* _SPARC_Counter_initialize(). The _SPARC_Counter and _SPARC_Counter_mutable
* are defined via the SPARC_COUNTER_DEFINITION define.
*/
extern SPARC_Counter _SPARC_Counter_mutable;
CPU_Counter_ticks _SPARC_Counter_read_address( void );
CPU_Counter_ticks _SPARC_Counter_read_asr23( void );
CPU_Counter_ticks _SPARC_Counter_difference_normal(
CPU_Counter_ticks second,
CPU_Counter_ticks first
);
CPU_Counter_ticks _SPARC_Counter_difference_clock_period(
CPU_Counter_ticks second,
CPU_Counter_ticks first
);
/*
* 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_one(
CPU_Counter_ticks second,
CPU_Counter_ticks first
);
static inline void _SPARC_Counter_initialize(
SPARC_Counter_read counter_read,
SPARC_Counter_difference counter_difference,
volatile const CPU_Counter_ticks *counter_address
)
{
_SPARC_Counter_mutable.counter_read = counter_read;
_SPARC_Counter_mutable.counter_difference = counter_difference;
_SPARC_Counter_mutable.counter_address = counter_address;
}
/*
* Defines the _SPARC_Counter and _SPARC_Counter_mutable global variables.
* Place this define in the global file scope of the CPU counter support file
* of the BSP.
*/
#define SPARC_COUNTER_DEFINITION \
__asm__ ( \
"\t.global\t_SPARC_Counter\n" \
"\t.global\t_SPARC_Counter_mutable\n" \
"\t.section\t.data._SPARC_Counter,\"aw\",@progbits\n" \
"\t.align\t4\n" \
"\t.type\t_SPARC_Counter, #object\n" \
"\t.size\t_SPARC_Counter, 12\n" \
"_SPARC_Counter:\n" \
"_SPARC_Counter_mutable:\n" \
"\t.long\t_SPARC_Counter_read_address\n" \
"\t.long\t_SPARC_Counter_difference_one\n" \
"\t.long\t_SPARC_Counter\n" \
)
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _RTEMS_SCORE_SPARCIMPL_H */
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