feat: readdir fix and demo

[lunaix-os.git] / lunaix-os / kernel / time / timer.c

diff --git a/lunaix-os/kernel/time/timer.c b/lunaix-os/kernel/time/timer.c
index 73bc0d5b8f25fdab712ae0be0c5b81b573da3cab..b9d333b1273856d202d2db4a0625e6cb9948654e 100644 (file)
--- a/lunaix-os/kernel/time/timer.c
+++ b/lunaix-os/kernel/time/timer.c
@@ -1,25 +1,26 @@
 /**
  * @file timer.c
  * @author Lunaixsky
- * @brief A simple timer implementation based on APIC with adjustable frequency and subscribable "timerlets"
+ * @brief A simple timer implementation based on APIC with adjustable frequency
+ * and subscribable "timerlets"
  * @version 0.1
  * @date 2022-03-12
- * 
+ *
  * @copyright Copyright (c) 2022
- * 
+ *
  */
 #include <arch/x86/interrupts.h>
 #include <hal/apic.h>
 #include <hal/rtc.h>
 
 #include <lunaix/mm/kalloc.h>
+#include <lunaix/sched.h>
 #include <lunaix/spike.h>
 #include <lunaix/syslog.h>
 #include <lunaix/timer.h>
 
 #define LVT_ENTRY_TIMER(vector, mode) (LVT_DELIVERY_FIXED | mode | vector)
 
-
 LOG_MODULE("TIMER");
 
 static void
@@ -38,6 +39,9 @@ static volatile struct lx_timer_context* timer_ctx = NULL;
 static volatile uint32_t rtc_counter = 0;
 static volatile uint8_t apic_timer_done = 0;
 
+static volatile uint32_t sched_ticks = 0;
+static volatile uint32_t sched_ticks_counter = 0;
+
 #define APIC_CALIBRATION_CONST 0x100000
 
 void
@@ -63,8 +67,7 @@ timer_init(uint32_t frequency)
     // Setup APIC timer
 
     // Setup a one-shot timer, we will use this to measure the bus speed. So we
-    // can
-    //   then calibrate apic timer to work at *nearly* accurate hz
+    // can then calibrate apic timer to work at *nearly* accurate hz
     apic_write_reg(APIC_TIMER_LVT,
                    LVT_ENTRY_TIMER(APIC_TIMER_IV, LVT_TIMER_ONESHOT));
 
@@ -75,13 +78,13 @@ timer_init(uint32_t frequency)
         Timer calibration process - measure the APIC timer base frequency
 
          step 1: setup a temporary isr for RTC timer which trigger at each tick
-                 (1024Hz) 
-         step 2: setup a temporary isr for #APIC_TIMER_IV 
-         step 3: setup the divider, APIC_TIMER_DCR 
-         step 4: Startup RTC timer 
-         step 5: Write a large value, v, to APIC_TIMER_ICR to start APIC timer (this must be
-                 followed immediately after step 4) 
-          step 6: issue a write to EOI and clean up.
+                 (1024Hz)
+         step 2: setup a temporary isr for #APIC_TIMER_IV
+         step 3: setup the divider, APIC_TIMER_DCR
+         step 4: Startup RTC timer
+         step 5: Write a large value, v, to APIC_TIMER_ICR to start APIC timer
+       (this must be followed immediately after step 4) step 6: issue a write to
+       EOI and clean up.
 
         When the APIC ICR counting down to 0 #APIC_TIMER_IV triggered, save the
        rtc timer's counter, k, and disable RTC timer immediately (although the
@@ -94,6 +97,12 @@ timer_init(uint32_t frequency)
 
     */
 
+#ifdef __LUNAIXOS_DEBUG__
+    if (frequency < 1000) {
+        kprintf(KWARN "Frequency too low. Millisecond timer might be dodgy.");
+    }
+#endif
+
     timer_ctx->base_frequency = 0;
     rtc_counter = 0;
     apic_timer_done = 0;
@@ -109,14 +118,12 @@ timer_init(uint32_t frequency)
 
     wait_until(apic_timer_done);
 
-    // cpu_disable_interrupt();
-
     assert_msg(timer_ctx->base_frequency, "Fail to initialize timer (NOFREQ)");
 
     kprintf(KINFO "Base frequency: %u Hz\n", timer_ctx->base_frequency);
 
     timer_ctx->running_frequency = frequency;
-    timer_ctx->tps = timer_ctx->base_frequency / frequency;
+    timer_ctx->tphz = timer_ctx->base_frequency / frequency;
 
     // cleanup
     intr_unsubscribe(APIC_TIMER_IV, temp_intr_routine_apic_timer);
@@ -126,27 +133,42 @@ timer_init(uint32_t frequency)
                    LVT_ENTRY_TIMER(APIC_TIMER_IV, LVT_TIMER_PERIODIC));
     intr_subscribe(APIC_TIMER_IV, timer_update);
 
-    apic_write_reg(APIC_TIMER_ICR, timer_ctx->tps);
+    apic_write_reg(APIC_TIMER_ICR, timer_ctx->tphz);
+
+    sched_ticks = timer_ctx->running_frequency / 1000 * SCHED_TIME_SLICE;
+    sched_ticks_counter = 0;
 }
 
-int
-timer_run_second(uint32_t second, void (*callback)(void*), void* payload, uint8_t flags)
+struct lx_timer*
+timer_run_second(uint32_t second,
+                 void (*callback)(void*),
+                 void* payload,
+                 uint8_t flags)
 {
-    return timer_run(second * timer_ctx->running_frequency, callback, payload, flags);
+    return timer_run(
+      second * timer_ctx->running_frequency, callback, payload, flags);
 }
 
-int
-timer_run_ms(uint32_t millisecond, void (*callback)(void*), void* payload, uint8_t flags)
+struct lx_timer*
+timer_run_ms(uint32_t millisecond,
+             void (*callback)(void*),
+             void* payload,
+             uint8_t flags)
 {
-    return timer_run(timer_ctx->running_frequency / 1000 * millisecond, callback, payload, flags);
+    return timer_run(timer_ctx->running_frequency / 1000 * millisecond,
+                     callback,
+                     payload,
+                     flags);
 }
 
-int
+struct lx_timer*
 timer_run(ticks_t ticks, void (*callback)(void*), void* payload, uint8_t flags)
 {
-    struct lx_timer* timer = (struct lx_timer*)lxmalloc(sizeof(struct lx_timer));
+    struct lx_timer* timer =
+      (struct lx_timer*)lxmalloc(sizeof(struct lx_timer));
 
-    if (!timer) return 0;
+    if (!timer)
+        return NULL;
 
     timer->callback = callback;
     timer->counter = ticks;
@@ -156,7 +178,7 @@ timer_run(ticks_t ticks, void (*callback)(void*), void* payload, uint8_t flags)
 
     llist_append(timer_ctx->active_timers, &timer->link);
 
-    return 1;
+    return timer;
 }
 
 static void
@@ -167,19 +189,32 @@ timer_update(const isr_param* param)
 
     llist_for_each(pos, n, &timer_list_head->link, link)
     {
-        if (--pos->counter) {
+        if (--(pos->counter)) {
             continue;
         }
 
         pos->callback ? pos->callback(pos->payload) : 1;
 
-        if (pos->flags & TIMER_MODE_PERIODIC) {
+        if ((pos->flags & TIMER_MODE_PERIODIC)) {
             pos->counter = pos->deadline;
         } else {
             llist_delete(&pos->link);
             lxfree(pos);
         }
     }
+
+    sched_ticks_counter++;
+
+    if (sched_ticks_counter >= sched_ticks) {
+        sched_ticks_counter = 0;
+        schedule();
+    }
+}
+
+void
+sched_yield()
+{
+    sched_ticks_counter = sched_ticks;
 }
 
 static void
@@ -202,7 +237,8 @@ temp_intr_routine_apic_timer(const isr_param* param)
     rtc_disable_timer();
 }
 
-struct lx_timer_context* 
-timer_context() {
+struct lx_timer_context*
+timer_context()
+{
     return timer_ctx;
 }
\ No newline at end of file