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drasko |
/*
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* Timer service for userspace
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*/
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#include <l4lib/lib/addr.h>
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#include <l4lib/irq.h>
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#include <l4lib/lib/thread.h>
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#include <l4lib/ipcdefs.h>
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#include <l4/api/errno.h>
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#include <l4/api/irq.h>
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#include <l4/api/capability.h>
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#include <l4/generic/cap-types.h>
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#include <l4/api/space.h>
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#include <malloc/malloc.h>
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#include <container.h>
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#include <linker.h>
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#include <timer.h>
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#include <libdev/timer.h>
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/* Capabilities of this service */
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static struct capability caparray[32];
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static int total_caps = 0;
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/* Total number of timer chips being handled by us */
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#define TIMERS_TOTAL 1
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static struct timer global_timer[TIMERS_TOTAL];
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/* Deafult timer to be used for sleep/wake etc purposes */
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#define SLEEP_WAKE_TIMER 0
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/* tasks whose sleep time has finished */
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struct wake_task_list wake_tasks;
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/* tid of handle_request thread */
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l4id_t tid_ipc_handler;
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int cap_read_all()
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{
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int ncaps;
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int err;
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/* Read number of capabilities */
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if ((err = l4_capability_control(CAP_CONTROL_NCAPS,
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0, &ncaps)) < 0) {
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printf("l4_capability_control() reading # of"
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" capabilities failed.\n Could not "
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"complete CAP_CONTROL_NCAPS request.\n");
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BUG();
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}
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total_caps = ncaps;
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/* Read all capabilities */
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if ((err = l4_capability_control(CAP_CONTROL_READ,
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0, caparray)) < 0) {
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printf("l4_capability_control() reading of "
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"capabilities failed.\n Could not "
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"complete CAP_CONTROL_READ_CAPS request.\n");
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BUG();
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}
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return 0;
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}
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int cap_share_all_with_space()
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{
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int err;
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/* Share all capabilities */
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if ((err = l4_capability_control(CAP_CONTROL_SHARE,
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CAP_SHARE_ALL_SPACE, 0)) < 0) {
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printf("l4_capability_control() sharing of "
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"capabilities failed.\n Could not "
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"complete CAP_CONTROL_SHARE request. err=%d\n",
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err);
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BUG();
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}
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return 0;
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}
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/*
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* Initialize timer devices
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*/
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void timer_struct_init(struct timer* timer, unsigned long base)
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{
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timer->base = base;
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timer->count = 0;
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timer->slot = 0;
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l4_mutex_init(&timer->task_list_lock);
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for (int i = 0; i < BUCKET_BASE_LEVEL_SIZE ; ++i) {
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link_init(&timer->task_list.bucket_level0[i]);
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}
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for (int i = 0; i < BUCKET_HIGHER_LEVEL_SIZE ; ++i) {
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link_init(&timer->task_list.bucket_level1[i]);
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link_init(&timer->task_list.bucket_level2[i]);
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link_init(&timer->task_list.bucket_level3[i]);
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link_init(&timer->task_list.bucket_level4[i]);
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}
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}
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/*
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* Initialize wake list head structure
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*/
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void wake_task_list_init(void)
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{
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link_init(&wake_tasks.head);
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wake_tasks.end = &wake_tasks.head;
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l4_mutex_init(&wake_tasks.wake_list_lock);
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}
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/*
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* Allocate new sleeper task struct
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*/
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struct sleeper_task *new_sleeper_task(l4id_t tid, int ret)
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{
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struct sleeper_task *task;
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/* May be we can prepare a cache for timer_task structs */
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task = (struct sleeper_task *)kzalloc(sizeof(struct sleeper_task));
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link_init(&task->list);
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task->tid = tid;
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task->retval = ret;
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return task;
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}
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void free_sleeper_task(struct sleeper_task *task)
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{
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kfree(task);
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task = NULL;
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}
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/*
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* Find the bucket list correspongding to seconds value
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*/
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struct link* find_bucket_list(unsigned long seconds)
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{
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struct link *vector;
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struct sleeper_task_bucket *bucket;
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bucket = &global_timer[SLEEP_WAKE_TIMER].task_list;
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/*
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* TODO: Check if we have already surpassed seconds
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*/
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if (IS_IN_LEVEL0_BUCKET(seconds)) {
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vector = &bucket->bucket_level0[GET_BUCKET_LEVEL0(seconds)];
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} else if (IS_IN_LEVEL1_BUCKET(seconds)) {
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vector = &bucket->bucket_level1[GET_BUCKET_LEVEL1(seconds)];
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} else if (IS_IN_LEVEL2_BUCKET(seconds)) {
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vector = &bucket->bucket_level2[GET_BUCKET_LEVEL2(seconds)];
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} else if (IS_IN_LEVEL3_BUCKET(seconds)) {
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vector = &bucket->bucket_level3[GET_BUCKET_LEVEL3(seconds)];
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} else {
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vector = &bucket->bucket_level4[GET_BUCKET_LEVEL4(seconds)];
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}
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return vector;
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}
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/*
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* Scans for up to TIMERS_TOTAL timer devices in capabilities.
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*/
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int timer_probe_devices(void)
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{
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int timers = 0;
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/* Scan for timer devices */
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for (int i = 0; i < total_caps; i++) {
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/* Match device type */
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if (cap_devtype(&caparray[i]) == CAP_DEVTYPE_TIMER) {
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/* Copy to correct device index */
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memcpy(&global_timer[cap_devnum(&caparray[i]) - 1].cap,
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&caparray[i], sizeof(global_timer[0].cap));
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timers++;
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}
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}
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if (timers != TIMERS_TOTAL) {
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printf("%s: Error, not all timers could be found. "
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"timers=%d\n", __CONTAINER_NAME__, timers);
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return -ENODEV;
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}
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return 0;
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}
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/*
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* Irq handler for timer interrupts
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*/
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int timer_irq_handler(void *arg)
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{
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int err;
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struct timer *timer = (struct timer *)arg;
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struct link *vector;
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const int slot = 0;
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/*
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* Initialise timer
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* 1 interrupt per second
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*/
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timer_init(timer->base, 1000000);
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/* Register self for timer irq, using notify slot 0 */
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if ((err = l4_irq_control(IRQ_CONTROL_REGISTER, slot,
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timer->cap.irq)) < 0) {
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printf("%s: FATAL: Timer irq could not be registered. "
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"err=%d\n", __FUNCTION__, err);
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BUG();
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}
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/* Enable Timer */
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timer_start(timer->base);
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/* Handle irqs forever */
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while (1) {
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int count;
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struct link *task_list;
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/* Block on irq */
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if((count = l4_irq_wait(slot, timer->cap.irq)) < 0) {
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| 223 |
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printf("l4_irq_wait() returned with negative value\n");
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| 224 |
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BUG();
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| 225 |
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}
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| 226 |
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| 227 |
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/*
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| 228 |
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* Update timer count
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| 229 |
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* TODO: Overflow check, we have 1 interrupt/sec from timer
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| 230 |
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* with 32bit count it will take 9years to overflow
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*/
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timer->count += count;
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printf("Got timer irq, current count = 0x%x\n", timer->count);
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/* find bucket list of taks to be woken for current count */
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vector = find_bucket_list(timer->count);
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| 238 |
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if (!list_empty(vector)) {
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| 239 |
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/* Removing tasks from sleeper list */
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| 240 |
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l4_mutex_lock(&global_timer[SLEEP_WAKE_TIMER].task_list_lock);
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| 241 |
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task_list = list_detach(vector);
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| 242 |
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l4_mutex_unlock(&global_timer[SLEEP_WAKE_TIMER].task_list_lock);
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| 243 |
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| 244 |
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/* Add tasks to wake_task_list */
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| 245 |
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l4_mutex_lock(&wake_tasks.wake_list_lock);
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list_attach(task_list, &wake_tasks.head, wake_tasks.end);
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| 247 |
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l4_mutex_unlock(&wake_tasks.wake_list_lock);
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| 248 |
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| 249 |
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/*
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| 250 |
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* Send ipc to handle_request
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| 251 |
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* thread to send wake signals
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| 252 |
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*/
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| 253 |
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l4_send(tid_ipc_handler,L4_IPC_TAG_TIMER_WAKE_THREADS);
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| 254 |
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}
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| 255 |
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}
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| 256 |
|
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}
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| 257 |
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| 258 |
|
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/*
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| 259 |
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* Helper routine to wake tasks from wake list
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| 260 |
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*/
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| 261 |
|
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void task_wake(void)
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| 262 |
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{
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| 263 |
|
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struct sleeper_task *struct_ptr, *temp_ptr;
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| 264 |
|
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int ret;
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| 265 |
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| 266 |
|
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if (!list_empty(&wake_tasks.head)) {
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| 267 |
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list_foreach_removable_struct(struct_ptr, temp_ptr,
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| 268 |
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&wake_tasks.head, list) {
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| 269 |
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/* Remove task from wake list */
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| 270 |
|
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l4_mutex_lock(&wake_tasks.wake_list_lock);
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| 271 |
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list_remove(&struct_ptr->list);
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| 272 |
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l4_mutex_unlock(&wake_tasks.wake_list_lock);
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| 273 |
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| 274 |
|
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/* Set sender correctly */
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| 275 |
|
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l4_set_sender(struct_ptr->tid);
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| 276 |
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| 277 |
|
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printf("%s : Waking thread 0x%x at time 0x%x\n", __CONTAINER_NAME__,
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| 278 |
|
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struct_ptr->tid, global_timer[SLEEP_WAKE_TIMER].count);
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| 279 |
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| 280 |
|
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/* send wake ipc */
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| 281 |
|
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if ((ret = l4_ipc_return(struct_ptr->retval)) < 0) {
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| 282 |
|
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printf("%s: IPC return error: %d.\n",
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| 283 |
|
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__FUNCTION__, ret);
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| 284 |
|
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BUG();
|
| 285 |
|
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}
|
| 286 |
|
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| 287 |
|
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/* free allocated sleeper task struct */
|
| 288 |
|
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free_sleeper_task(struct_ptr);
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| 289 |
|
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}
|
| 290 |
|
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}
|
| 291 |
|
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/* If wake list is empty set end = start */
|
| 292 |
|
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if (list_empty(&wake_tasks.head))
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| 293 |
|
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wake_tasks.end = &wake_tasks.head;
|
| 294 |
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|
| 295 |
|
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}
|
| 296 |
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| 297 |
|
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int timer_setup_devices(void)
|
| 298 |
|
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{
|
| 299 |
|
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struct l4_thread thread;
|
| 300 |
|
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struct l4_thread *tptr = &thread;
|
| 301 |
|
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int err;
|
| 302 |
|
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|
| 303 |
|
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for (int i = 0; i < TIMERS_TOTAL; i++) {
|
| 304 |
|
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/* initialize timer */
|
| 305 |
|
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timer_struct_init(&global_timer[i],(unsigned long)l4_new_virtual(1) );
|
| 306 |
|
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|
| 307 |
|
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/* Map timer to a virtual address region */
|
| 308 |
|
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if (IS_ERR(l4_map((void *)__pfn_to_addr(global_timer[i].cap.start),
|
| 309 |
|
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(void *)global_timer[i].base, global_timer[i].cap.size,
|
| 310 |
|
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MAP_USR_IO,
|
| 311 |
|
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self_tid()))) {
|
| 312 |
|
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printf("%s: FATAL: Failed to map TIMER device "
|
| 313 |
|
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"%d to a virtual address\n",
|
| 314 |
|
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__CONTAINER_NAME__,
|
| 315 |
|
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cap_devnum(&global_timer[i].cap));
|
| 316 |
|
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BUG();
|
| 317 |
|
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}
|
| 318 |
|
|
|
| 319 |
|
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/*
|
| 320 |
|
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* Create new timer irq handler thread.
|
| 321 |
|
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*
|
| 322 |
|
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* This will initialize its timer argument, register
|
| 323 |
|
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* itself as its irq handler, initiate the timer and
|
| 324 |
|
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* wait on irqs.
|
| 325 |
|
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*/
|
| 326 |
|
|
if ((err = thread_create(timer_irq_handler, &global_timer[i],
|
| 327 |
|
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TC_SHARE_SPACE,
|
| 328 |
|
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&tptr)) < 0) {
|
| 329 |
|
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printf("FATAL: Creation of irq handler "
|
| 330 |
|
|
"thread failed.\n");
|
| 331 |
|
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BUG();
|
| 332 |
|
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}
|
| 333 |
|
|
}
|
| 334 |
|
|
|
| 335 |
|
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return 0;
|
| 336 |
|
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}
|
| 337 |
|
|
|
| 338 |
|
|
/*
|
| 339 |
|
|
* Declare a statically allocated char buffer
|
| 340 |
|
|
* with enough bitmap size to cover given size
|
| 341 |
|
|
*/
|
| 342 |
|
|
#define DECLARE_IDPOOL(name, size) \
|
| 343 |
|
|
char name[(sizeof(struct id_pool) + ((size >> 12) >> 3))]
|
| 344 |
|
|
|
| 345 |
|
|
#define PAGE_POOL_SIZE SZ_1MB
|
| 346 |
|
|
static struct address_pool device_vaddr_pool;
|
| 347 |
|
|
DECLARE_IDPOOL(device_id_pool, PAGE_POOL_SIZE);
|
| 348 |
|
|
|
| 349 |
|
|
/*
|
| 350 |
|
|
* Initialize a virtual address pool
|
| 351 |
|
|
* for mapping physical devices.
|
| 352 |
|
|
*/
|
| 353 |
|
|
void init_vaddr_pool(void)
|
| 354 |
|
|
{
|
| 355 |
|
|
for (int i = 0; i < total_caps; i++) {
|
| 356 |
|
|
/* Find the virtual memory region for this process */
|
| 357 |
|
|
if (cap_type(&caparray[i]) == CAP_TYPE_MAP_VIRTMEM
|
| 358 |
|
|
&& __pfn_to_addr(caparray[i].start) ==
|
| 359 |
|
|
(unsigned long)vma_start) {
|
| 360 |
|
|
|
| 361 |
|
|
/*
|
| 362 |
|
|
* Do we have any unused virtual space
|
| 363 |
|
|
* where we run, and do we have enough
|
| 364 |
|
|
* pages of it to map all timers?
|
| 365 |
|
|
*/
|
| 366 |
|
|
if (__pfn(page_align_up(__end))
|
| 367 |
|
|
+ TIMERS_TOTAL <= caparray[i].end) {
|
| 368 |
|
|
/*
|
| 369 |
|
|
* Yes. We initialize the device
|
| 370 |
|
|
* virtual memory pool here.
|
| 371 |
|
|
*
|
| 372 |
|
|
* We may allocate virtual memory
|
| 373 |
|
|
* addresses from this pool.
|
| 374 |
|
|
*/
|
| 375 |
|
|
address_pool_init(&device_vaddr_pool,
|
| 376 |
|
|
(struct id_pool *)&device_id_pool,
|
| 377 |
|
|
page_align_up(__end),
|
| 378 |
|
|
__pfn_to_addr(caparray[i].end));
|
| 379 |
|
|
return;
|
| 380 |
|
|
} else
|
| 381 |
|
|
goto out_err;
|
| 382 |
|
|
}
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
out_err:
|
| 386 |
|
|
printf("%s: FATAL: No virtual memory "
|
| 387 |
|
|
"region available to map "
|
| 388 |
|
|
"devices.\n", __CONTAINER_NAME__);
|
| 389 |
|
|
BUG();
|
| 390 |
|
|
}
|
| 391 |
|
|
|
| 392 |
|
|
void *l4_new_virtual(int npages)
|
| 393 |
|
|
{
|
| 394 |
|
|
return address_new(&device_vaddr_pool, npages, PAGE_SIZE);
|
| 395 |
|
|
}
|
| 396 |
|
|
|
| 397 |
|
|
/*
|
| 398 |
|
|
* Got request for sleep for seconds,
|
| 399 |
|
|
* right now max sleep allowed is 2^32 sec
|
| 400 |
|
|
*/
|
| 401 |
|
|
void task_sleep(l4id_t tid, unsigned long seconds, int ret)
|
| 402 |
|
|
{
|
| 403 |
|
|
struct sleeper_task *task = new_sleeper_task(tid, ret);
|
| 404 |
|
|
struct link *vector;
|
| 405 |
|
|
|
| 406 |
|
|
/* can overflow happen here?, timer is in 32bit mode */
|
| 407 |
|
|
seconds += global_timer[SLEEP_WAKE_TIMER].count;
|
| 408 |
|
|
|
| 409 |
|
|
printf("sleep wake timer lock is present at address %lx\n",
|
| 410 |
|
|
( (unsigned long)&global_timer[SLEEP_WAKE_TIMER].task_list_lock.lock));
|
| 411 |
|
|
|
| 412 |
|
|
vector = find_bucket_list(seconds);
|
| 413 |
|
|
|
| 414 |
|
|
printf("Acquiring lock for sleep wake timer\n");
|
| 415 |
|
|
l4_mutex_lock(&global_timer[SLEEP_WAKE_TIMER].task_list_lock);
|
| 416 |
|
|
printf("got lock for sleep wake timer\n");
|
| 417 |
|
|
|
| 418 |
|
|
list_insert(&task->list, vector);
|
| 419 |
|
|
|
| 420 |
|
|
printf("Releasing lock for sleep wake timer\n");
|
| 421 |
|
|
l4_mutex_unlock(&global_timer[SLEEP_WAKE_TIMER].task_list_lock);
|
| 422 |
|
|
printf("released lock for sleep wake timer\n");
|
| 423 |
|
|
|
| 424 |
|
|
}
|
| 425 |
|
|
|
| 426 |
|
|
void handle_requests(void)
|
| 427 |
|
|
{
|
| 428 |
|
|
u32 mr[MR_UNUSED_TOTAL];
|
| 429 |
|
|
l4id_t senderid;
|
| 430 |
|
|
u32 tag;
|
| 431 |
|
|
int ret;
|
| 432 |
|
|
|
| 433 |
|
|
if ((ret = l4_receive(L4_ANYTHREAD)) < 0) {
|
| 434 |
|
|
printf("%s: %s: IPC Error: %d. Quitting...\n",
|
| 435 |
|
|
__CONTAINER__, __FUNCTION__, ret);
|
| 436 |
|
|
BUG();
|
| 437 |
|
|
}
|
| 438 |
|
|
|
| 439 |
|
|
/* Syslib conventional ipc data which uses first few mrs. */
|
| 440 |
|
|
tag = l4_get_tag();
|
| 441 |
|
|
senderid = l4_get_sender();
|
| 442 |
|
|
|
| 443 |
|
|
/* Read mrs not used by syslib */
|
| 444 |
|
|
for (int i = 0; i < MR_UNUSED_TOTAL; i++)
|
| 445 |
|
|
mr[i] = read_mr(MR_UNUSED_START + i);
|
| 446 |
|
|
|
| 447 |
|
|
/*
|
| 448 |
|
|
* TODO:
|
| 449 |
|
|
*
|
| 450 |
|
|
* Maybe add tags here that handle requests for sharing
|
| 451 |
|
|
* of the requested timer device with the client?
|
| 452 |
|
|
*
|
| 453 |
|
|
* In order to be able to do that, we should have a
|
| 454 |
|
|
* shareable/grantable capability to the device. Also
|
| 455 |
|
|
* the request should (currently) come from a task
|
| 456 |
|
|
* inside the current container
|
| 457 |
|
|
*/
|
| 458 |
|
|
switch (tag) {
|
| 459 |
|
|
/* Return time in seconds, since the timer was started */
|
| 460 |
|
|
case L4_IPC_TAG_TIMER_GETTIME:
|
| 461 |
|
|
printf("%s: Got get time request from thread 0x%x "
|
| 462 |
|
|
" at time = 0x%x\n", __CONTAINER_NAME__,
|
| 463 |
|
|
senderid, global_timer[SLEEP_WAKE_TIMER].count);
|
| 464 |
|
|
|
| 465 |
|
|
write_mr(2, global_timer[SLEEP_WAKE_TIMER].count);
|
| 466 |
|
|
|
| 467 |
|
|
/* Reply */
|
| 468 |
|
|
if ((ret = l4_ipc_return(ret)) < 0) {
|
| 469 |
|
|
printf("%s: IPC return error: %d.\n", __FUNCTION__, ret);
|
| 470 |
|
|
BUG();
|
| 471 |
|
|
}
|
| 472 |
|
|
break;
|
| 473 |
|
|
|
| 474 |
|
|
case L4_IPC_TAG_TIMER_SLEEP:
|
| 475 |
|
|
printf("%s: Got sleep request from thread 0x%x "
|
| 476 |
|
|
"for 0x%x seconds at 0x%x seconds\n",
|
| 477 |
|
|
__CONTAINER_NAME__, senderid, mr[0],
|
| 478 |
|
|
global_timer[SLEEP_WAKE_TIMER].count);
|
| 479 |
|
|
|
| 480 |
|
|
if (mr[0] > 0) {
|
| 481 |
|
|
task_sleep(senderid, mr[0], ret);
|
| 482 |
|
|
}
|
| 483 |
|
|
else {
|
| 484 |
|
|
if ((ret = l4_ipc_return(ret)) < 0) {
|
| 485 |
|
|
printf("%s: IPC return error: %d.\n",
|
| 486 |
|
|
__FUNCTION__, ret);
|
| 487 |
|
|
BUG();
|
| 488 |
|
|
}
|
| 489 |
|
|
}
|
| 490 |
|
|
break;
|
| 491 |
|
|
|
| 492 |
|
|
/* Intra container ipc by irq_thread */
|
| 493 |
|
|
case L4_IPC_TAG_TIMER_WAKE_THREADS:
|
| 494 |
|
|
task_wake();
|
| 495 |
|
|
break;
|
| 496 |
|
|
|
| 497 |
|
|
default:
|
| 498 |
|
|
printf("%s: Error received ipc from 0x%x residing "
|
| 499 |
|
|
"in container %x with an unrecognized tag: "
|
| 500 |
|
|
"0x%x\n", __CONTAINER__, senderid,
|
| 501 |
|
|
__cid(senderid), tag);
|
| 502 |
|
|
}
|
| 503 |
|
|
}
|
| 504 |
|
|
|
| 505 |
|
|
/*
|
| 506 |
|
|
* UTCB-size aligned utcb.
|
| 507 |
|
|
*
|
| 508 |
|
|
* BIG WARNING NOTE: This declaration is legal if we are
|
| 509 |
|
|
* running in a disjoint virtual address space, where the
|
| 510 |
|
|
* utcb declaration lies in a unique virtual address in
|
| 511 |
|
|
* the system.
|
| 512 |
|
|
*/
|
| 513 |
|
|
#define DECLARE_UTCB(name) \
|
| 514 |
|
|
struct utcb name ALIGN(sizeof(struct utcb))
|
| 515 |
|
|
|
| 516 |
|
|
DECLARE_UTCB(utcb);
|
| 517 |
|
|
|
| 518 |
|
|
/* Set up own utcb for ipc */
|
| 519 |
|
|
int l4_utcb_setup(void *utcb_address)
|
| 520 |
|
|
{
|
| 521 |
|
|
struct task_ids ids;
|
| 522 |
|
|
struct exregs_data exregs;
|
| 523 |
|
|
int err;
|
| 524 |
|
|
|
| 525 |
|
|
l4_getid(&ids);
|
| 526 |
|
|
|
| 527 |
|
|
/* Clear utcb */
|
| 528 |
|
|
memset(utcb_address, 0, sizeof(struct utcb));
|
| 529 |
|
|
|
| 530 |
|
|
/* Setup exregs for utcb request */
|
| 531 |
|
|
memset(&exregs, 0, sizeof(exregs));
|
| 532 |
|
|
exregs_set_utcb(&exregs, (unsigned long)utcb_address);
|
| 533 |
|
|
|
| 534 |
|
|
if ((err = l4_exchange_registers(&exregs, ids.tid)) < 0)
|
| 535 |
|
|
return err;
|
| 536 |
|
|
|
| 537 |
|
|
return 0;
|
| 538 |
|
|
}
|
| 539 |
|
|
|
| 540 |
|
|
void main(void)
|
| 541 |
|
|
{
|
| 542 |
|
|
int err;
|
| 543 |
|
|
|
| 544 |
|
|
/* Read all capabilities */
|
| 545 |
|
|
cap_read_all();
|
| 546 |
|
|
|
| 547 |
|
|
/* Share all with space */
|
| 548 |
|
|
cap_share_all_with_space();
|
| 549 |
|
|
|
| 550 |
|
|
/* Scan for timer devices in capabilities */
|
| 551 |
|
|
timer_probe_devices();
|
| 552 |
|
|
|
| 553 |
|
|
/* Initialize virtual address pool for timers */
|
| 554 |
|
|
init_vaddr_pool();
|
| 555 |
|
|
|
| 556 |
|
|
/* Setup own static utcb */
|
| 557 |
|
|
if ((err = l4_utcb_setup(&utcb)) < 0) {
|
| 558 |
|
|
printf("FATAL: Could not set up own utcb. "
|
| 559 |
|
|
"err=%d\n", err);
|
| 560 |
|
|
BUG();
|
| 561 |
|
|
}
|
| 562 |
|
|
|
| 563 |
|
|
/* initialise timed_out_task list */
|
| 564 |
|
|
wake_task_list_init();
|
| 565 |
|
|
|
| 566 |
|
|
/* Map and initialize timer devices */
|
| 567 |
|
|
timer_setup_devices();
|
| 568 |
|
|
|
| 569 |
|
|
/* Set the tid of ipc handler */
|
| 570 |
|
|
tid_ipc_handler = self_tid();
|
| 571 |
|
|
|
| 572 |
|
|
/* Listen for timer requests */
|
| 573 |
|
|
while (1)
|
| 574 |
|
|
handle_requests();
|
| 575 |
|
|
}
|
| 576 |
|
|
|
