diff options
Diffstat (limited to 'platform/pc/timer.c')
| -rw-r--r-- | platform/pc/timer.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/platform/pc/timer.c b/platform/pc/timer.c deleted file mode 100644 index fd263323..00000000 --- a/platform/pc/timer.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * Copyright (c) 2009 Corey Tabaka - * - * 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 <reg.h> -#include <debug.h> -#include <kernel/thread.h> -#include <kernel/spinlock.h> -#include <platform.h> -#include <platform/interrupts.h> -#include <platform/console.h> -#include <platform/timer.h> -#include <platform/pc.h> -#include "platform_p.h" -#include <arch/x86.h> - -static platform_timer_callback t_callback; -static void *callback_arg; -static spin_lock_t lock; - -static uint64_t next_trigger_time; -static uint64_t next_trigger_delta; -static uint64_t ticks_per_ms; - -static uint64_t timer_delta_time; -static volatile uint64_t timer_current_time; - -static uint16_t divisor; - -#define INTERNAL_FREQ 1193182ULL -#define INTERNAL_FREQ_3X 3579546ULL - -/* Maximum amount of time that can be program on the timer to schedule the next - * interrupt, in milliseconds */ -#define MAX_TIMER_INTERVAL 55 - - - -status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval) -{ - t_callback = callback; - callback_arg = arg; - - next_trigger_delta = (uint64_t) interval << 32; - next_trigger_time = timer_current_time + next_trigger_delta; - - return NO_ERROR; -} - -lk_time_t current_time(void) -{ - lk_time_t time; - - // XXX slight race - time = (lk_time_t) (timer_current_time >> 32); - - return time; -} - -lk_bigtime_t current_time_hires(void) -{ - lk_bigtime_t time; - - // XXX slight race - time = (lk_bigtime_t) ((timer_current_time >> 22) * 1000) >> 10; - - return time; -} -static enum handler_return os_timer_tick(void *arg) -{ - uint64_t delta; - - timer_current_time += timer_delta_time; - - lk_time_t time = current_time(); - //lk_bigtime_t btime = current_time_hires(); - //printf_xy(71, 0, WHITE, "%08u", (uint32_t) time); - //printf_xy(63, 1, WHITE, "%016llu", (uint64_t) btime); - - if (t_callback && timer_current_time >= next_trigger_time) { - delta = timer_current_time - next_trigger_time; - next_trigger_time = timer_current_time + next_trigger_delta - delta; - - return t_callback(callback_arg, time); - } else { - return INT_NO_RESCHEDULE; - } -} - -static void set_pit_frequency(uint32_t frequency) -{ - uint32_t count, remainder; - - /* figure out the correct divisor for the desired frequency */ - if (frequency <= 18) { - count = 0xffff; - } else if (frequency >= INTERNAL_FREQ) { - count = 1; - } else { - count = INTERNAL_FREQ_3X / frequency; - remainder = INTERNAL_FREQ_3X % frequency; - - if (remainder >= INTERNAL_FREQ_3X / 2) { - count += 1; - } - - count /= 3; - remainder = count % 3; - - if (remainder >= 1) { - count += 1; - } - } - - divisor = count & 0xffff; - - /* - * funky math that i don't feel like explaining. essentially 32.32 fixed - * point representation of the configured timer delta. - */ - timer_delta_time = (3685982306ULL * count) >> 10; - - //dprintf(DEBUG, "set_pit_frequency: dt=%016llx\n", timer_delta_time); - //dprintf(DEBUG, "set_pit_frequency: divisor=%04x\n", divisor); - - /* - * setup the Programmable Interval Timer - * timer 0, mode 2, binary counter, LSB followed by MSB - */ - outp(I8253_CONTROL_REG, 0x34); - outp(I8253_DATA_REG, divisor & 0xff); // LSB - outp(I8253_DATA_REG, divisor >> 8); // MSB -} - -void platform_init_timer(void) -{ - - timer_current_time = 0; - ticks_per_ms = INTERNAL_FREQ/1000; - set_pit_frequency(1000); // ~1ms granularity - register_int_handler(INT_PIT, &os_timer_tick, NULL); - unmask_interrupt(INT_PIT); -} - -void platform_halt_timers(void) -{ - mask_interrupt(INT_PIT); -} - - - -status_t platform_set_oneshot_timer(platform_timer_callback callback, - void *arg, lk_time_t interval) -{ - - uint32_t count; - - spin_lock_saved_state_t state; - spin_lock_irqsave(&lock, state); - - t_callback = callback; - callback_arg = arg; - - - if (interval > MAX_TIMER_INTERVAL) - interval = MAX_TIMER_INTERVAL; - if (interval < 1) interval = 1; - - count = ticks_per_ms * interval; - - divisor = count & 0xffff; - timer_delta_time = (3685982306ULL * count) >> 10; - /* Program PIT in the software strobe configuration, to send one pulse - * after the count reach 0 */ - outp(I8253_CONTROL_REG, 0x38); - outp(I8253_DATA_REG, divisor & 0xff); // LSB - outp(I8253_DATA_REG, divisor >> 8); // MSB - - - unmask_interrupt(INT_PIT); - spin_unlock_irqrestore(&lock, state); - - return NO_ERROR; -} - -void platform_stop_timer(void) -{ - /* Enable interrupt mode that will stop the decreasing counter of the PIT */ - outp(I8253_CONTROL_REG, 0x30); - return; -} |