diff options
Diffstat (limited to 'cpukit/score/cpu/no_cpu')
| -rw-r--r-- | cpukit/score/cpu/no_cpu/Makefile.am | 1 | ||||
| -rw-r--r-- | cpukit/score/cpu/no_cpu/cpucounterread.c | 27 | ||||
| -rw-r--r-- | cpukit/score/cpu/no_cpu/rtems/score/cpu.h | 34 |
3 files changed, 62 insertions, 0 deletions
diff --git a/cpukit/score/cpu/no_cpu/Makefile.am b/cpukit/score/cpu/no_cpu/Makefile.am index 24517431e7..4c812575e9 100644 --- a/cpukit/score/cpu/no_cpu/Makefile.am +++ b/cpukit/score/cpu/no_cpu/Makefile.am @@ -12,6 +12,7 @@ include_rtems_score_HEADERS += rtems/score/cpusmplock.h noinst_LIBRARIES = libscorecpu.a libscorecpu_a_SOURCES = cpu.c cpu_asm.c +libscorecpu_a_SOURCES += cpucounterread.c libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS) include $(srcdir)/preinstall.am diff --git a/cpukit/score/cpu/no_cpu/cpucounterread.c b/cpukit/score/cpu/no_cpu/cpucounterread.c new file mode 100644 index 0000000000..0a09376b63 --- /dev/null +++ b/cpukit/score/cpu/no_cpu/cpucounterread.c @@ -0,0 +1,27 @@ +/* + * Copyright (c) 2014 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.com/license/LICENSE. + */ + +#include <rtems/score/cpu.h> + +CPU_Counter_ticks _CPU_Counter_read( void ) +{ + static CPU_Counter_ticks counter; + + CPU_Counter_ticks snapshot; + + snapshot = counter; + counter = snapshot + 1; + + return snapshot; +} diff --git a/cpukit/score/cpu/no_cpu/rtems/score/cpu.h b/cpukit/score/cpu/no_cpu/rtems/score/cpu.h index 783da76dee..9fdc7fc5a2 100644 --- a/cpukit/score/cpu/no_cpu/rtems/score/cpu.h +++ b/cpukit/score/cpu/no_cpu/rtems/score/cpu.h @@ -1426,6 +1426,40 @@ static inline uint32_t CPU_swap_u32( #define CPU_swap_u16( value ) \ (((value&0xff) << 8) | ((value >> 8)&0xff)) +/** + * @brief Unsigned integer type for CPU counter values. + */ +typedef uint32_t CPU_Counter_ticks; + +/** + * @brief Returns the current CPU counter value. + * + * A CPU counter is some free-running counter. It ticks usually with a + * frequency close to the CPU or system bus clock. The board support package + * must ensure that this function works before the RTEMS initialization. + * Otherwise invalid profiling statistics will be gathered. + * + * @return The current CPU counter value. + */ +CPU_Counter_ticks _CPU_Counter_read( void ); + +/** + * @brief Returns the difference between the second and first CPU counter + * value. + * + * This operation may be carried out as a modulo operation depending on the + * range of the CPU counter device. + * + * @param[in] second The second CPU counter value. + * @param[in] first The first CPU counter value. + * + * @return Returns second minus first modulo counter period. + */ +CPU_Counter_ticks _CPU_Counter_difference( + CPU_Counter_ticks second, + CPU_Counter_ticks first +); + #ifdef RTEMS_SMP /** * @brief Returns the index of the current processor. |