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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-06-22 13:45:02 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-06-22 14:00:27 +0200 |
commit | 655ce0fb00c75c523dd81466a2dcf611171e4650 (patch) | |
tree | 91713d5a3efc4b935efb16101e449fb298caa238 /cpukit/score/cpu/sparc/rtems/score/sparcimpl.h | |
parent | sptests/sp20: Use printer task (diff) | |
download | rtems-655ce0fb00c75c523dd81466a2dcf611171e4650.tar.bz2 |
sparc: Optimize CPU counter support
Diffstat (limited to 'cpukit/score/cpu/sparc/rtems/score/sparcimpl.h')
-rw-r--r-- | cpukit/score/cpu/sparc/rtems/score/sparcimpl.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/cpukit/score/cpu/sparc/rtems/score/sparcimpl.h b/cpukit/score/cpu/sparc/rtems/score/sparcimpl.h new file mode 100644 index 0000000000..9f9999b063 --- /dev/null +++ b/cpukit/score/cpu/sparc/rtems/score/sparcimpl.h @@ -0,0 +1,90 @@ +/* + * 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 */ |