M7350/bootable/bootloader/lk/platform/armemu/timer.c

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2024-09-09 08:52:07 +00:00
/*
* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <sys/types.h>
#include <err.h>
#include <kernel/thread.h>
#include <platform.h>
#include <platform/interrupts.h>
#include <platform/timer.h>
#include <platform/armemu.h>
#include "platform_p.h"
static platform_timer_callback t_callback;
status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, time_t interval)
{
enter_critical_section();
t_callback = callback;
*REG(PIT_CLEAR) = 1;
*REG(PIT_INTERVAL) = interval;
*REG(PIT_START_PERIODIC) = 1;
unmask_interrupt(INT_PIT);
exit_critical_section();
return NO_ERROR;
}
bigtime_t current_time_hires(void)
{
bigtime_t time;
*REG(SYSINFO_TIME_LATCH) = 1;
time = *REG(SYSINFO_TIME_SECS) * 1000000ULL;
time += *REG(SYSINFO_TIME_USECS);
return time;
}
time_t current_time(void)
{
time_t time;
*REG(SYSINFO_TIME_LATCH) = 1;
time = *REG(SYSINFO_TIME_SECS) * 1000;
time += *REG(SYSINFO_TIME_USECS) / 1000;
return time;
}
static enum handler_return platform_tick(void *arg)
{
*REG(PIT_CLEAR_INT) = 1;
if (t_callback) {
return t_callback(arg, current_time());
} else {
return INT_NO_RESCHEDULE;
}
}
void platform_init_timer(void)
{
register_int_handler(INT_PIT, &platform_tick, NULL);
}