diff options
author | Hesham ALMatary <heshamelmatary@gmail.com> | 2015-05-21 17:53:53 +0100 |
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committer | Gedare Bloom <gedare@rtems.org> | 2015-05-21 16:03:34 -0400 |
commit | 6f71dcb7cdaff53d8b44ea7c13ddb48d274663e7 (patch) | |
tree | 8854c63e9a514b4b9c1e7e5fb4b166d165e6025b /c/src/lib/libbsp/epiphany/epiphany_sim/timer | |
parent | cpukit: Add Epiphany architecture port v4 (diff) | |
download | rtems-6f71dcb7cdaff53d8b44ea7c13ddb48d274663e7.tar.bz2 |
Epiphany: Add the first epiphany_sim BSP v4
This BSP in intended to run on the simulator that should be built
from RSB. When building RTEMS for Epiphany --disable-networking must
be provided part of the configure command.
Diffstat (limited to 'c/src/lib/libbsp/epiphany/epiphany_sim/timer')
-rw-r--r-- | c/src/lib/libbsp/epiphany/epiphany_sim/timer/timer.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/epiphany/epiphany_sim/timer/timer.c b/c/src/lib/libbsp/epiphany/epiphany_sim/timer/timer.c new file mode 100644 index 0000000000..5df9448e01 --- /dev/null +++ b/c/src/lib/libbsp/epiphany/epiphany_sim/timer/timer.c @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2015 University of York. + * Hesham ALMatary <hmka501@york.ac.uk> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <rtems.h> +#include <bsp.h> +#include <rtems/btimer.h> +#include <rtems/score/epiphany-utility.h> + +extern char bsp_start_vector_table_begin[]; + +bool benchmark_timer_find_average_overhead; + +static void benchmark_timer1_interrupt_handler(void) +{ + unsigned int val = 0xFFFFFFFF; + unsigned int event_type = 0x1; + + /* Embed assembly code for setting timer1 */ + __asm__ __volatile__ ("movts ctimer1, %[val] \t \n" :: [val] "r" (val)); + + __asm__ __volatile__ ("movfs r16, config; \t \n" + "mov r17, %%low(0xfffff0ff);\t \n" + "movt r17, %%high(0xffff0ff);\t \n" + "lsl r18, %[event_type], 0x8; \t \n" + "and r16, r16, r17; \t \n" + "orr r16, r16, r18; \t \n" + "movts config, r16; \t \n" + :: [event_type] "r" (event_type)); +} + +/* Start eCore tiemr 1 usef for profiling and timing analysis */ +void benchmark_timer_initialize( void ) +{ + /* Install interrupt handler for timer 1 */ + + proc_ptr *table = + (proc_ptr *) bsp_start_vector_table_begin; + + table[TIMER1] = benchmark_timer1_interrupt_handler; + + benchmark_timer1_interrupt_handler(); +} + +/* + * The following controls the behavior of benchmark_timer_read(). + * + * AVG_OVEREHAD is the overhead for starting and stopping the timer. It + * is usually deducted from the number returned. + * + * LEAST_VALID is the lowest number this routine should trust. Numbers + * below this are "noise" and zero is returned. + */ + +#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */ + /* (Y countdowns) to start/stop the timer. */ + /* This value is in microseconds. */ +#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */ + +benchmark_timer_t benchmark_timer_read( void ) +{ + uint32_t timer_val = 0; + uint32_t total; + + __asm__ __volatile__ ("movfs %[timer_val], ctimer1 \t \n" + :[timer_val] "=r" (timer_val):); + + total = (0xFFFFFFFF - timer_val); + + if ( benchmark_timer_find_average_overhead == true ) + return total; + else { + if ( total < LEAST_VALID ) + return 0; /* below timer resolution */ + /* + * Somehow convert total into microseconds + */ + return (total - AVG_OVERHEAD); + } +} + +void benchmark_timer_disable_subtracting_average_overhead( + bool find_flag +) +{ + benchmark_timer_find_average_overhead = find_flag; +} |