137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief Context switch benchmark
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*
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* \author Andrea Righi <arighi@develer.com>
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* \author Daniele Basiele <asterix@develer.com>
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*/
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#include "context_switch.h"
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#include "hw/hw_led.h"
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#include "cfg/cfg_context_switch.h"
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#include <cfg/debug.h>
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#include <cpu/irq.h>
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#include <cpu/power.h>
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#include <drv/timer.h>
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#if CONFIG_USE_HP_TIMER
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#include <drv/ser.h>
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static Serial out;
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#endif
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#include <kern/proc.h>
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#define PROC_STACK_SIZE KERN_MINSTACKSIZE
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static PROC_DEFINE_STACK(hp_stack, PROC_STACK_SIZE);
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static PROC_DEFINE_STACK(lp_stack, PROC_STACK_SIZE);
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static Process *hp_proc, *lp_proc, *main_proc;
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#if CONFIG_USE_HP_TIMER
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static hptime_t start, end;
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#endif
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static void NORETURN hp_process(void)
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{
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while (1)
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{
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sig_wait(SIG_USER0);
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#if CONFIG_USE_LED
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LED_ON();
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#endif
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#if CONFIG_USE_HP_TIMER
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end = timer_hw_hpread();
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#endif
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sig_send(main_proc, SIG_USER0);
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}
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}
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static void NORETURN lp_process(void)
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{
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while (1)
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{
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sig_wait(SIG_USER0);
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#if CONFIG_USE_LED
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LED_ON();
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LED_OFF();
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#endif
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#if CONFIG_USE_HP_TIMER
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start = timer_hw_hpread();
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#endif
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sig_send(hp_proc, SIG_USER0);
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}
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}
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void NORETURN context_switch(void)
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{
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IRQ_ENABLE;
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timer_init();
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proc_init();
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#if CONFIG_USE_HP_TIMER
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ser_init(&out, CONFIG_CTX_DEBUG_PORT);
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ser_setbaudrate(&out, CONFIG_CTX_DEBUG_BAUDRATE);
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#endif
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#if CONFIG_USE_LED
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LED_INIT();
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#endif
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proc_forbid();
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hp_proc = proc_new(hp_process, NULL, PROC_STACK_SIZE, hp_stack);
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lp_proc = proc_new(lp_process, NULL, PROC_STACK_SIZE, lp_stack);
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main_proc = proc_current();
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proc_setPri(hp_proc, 2);
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proc_setPri(lp_proc, 1);
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proc_permit();
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while (1)
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{
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timer_delay(100);
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sig_send(lp_proc, SIG_USER0);
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sig_wait(SIG_USER0);
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#if CONFIG_USE_HP_TIMER
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kfile_printf(&out.fd,
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"Switch: %lu.%lu usec\n\r",
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hptime_to_us((end - start)),
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hptime_to_us((end - start) * 1000) % 1000);
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#endif
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}
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}
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