fix a few bugs in scheduling and synchronization, separate OVMF_VARS for debug

code/kernel/ke_event.c

@@ -21,37 +21,35 @@ KSTATUS KeEventCreate(EVENT_TYPE type, uint32_t initialState, EVENT **out) {
 
 void KeSignalEvent(EVENT* event) {
     if (!event) return;
-    KeAcquireSpinlock(&event->Lock);
+    uintptr_t flags = KeAcquireSpinlock(&event->Lock);
 
     if (event->Type == EventManualReset) {
-        // Wake all waiters.
         event->Signaled = 1;
         while (!LIST_IS_EMPTY(&event->WaitList)) {
             LIST_ENTRY* node = ListPopHead(&event->WaitList);
             THREAD* t = CONTAINING_RECORD(node, THREAD, SchedulerLink);
-            KeReleaseSpinlock(&event->Lock);
+            KeReleaseSpinlock(&event->Lock, flags);
             KeUnblockThread(t);
-            KeAcquireSpinlock(&event->Lock);
+            flags = KeAcquireSpinlock(&event->Lock);
         }
     } else {
-        // Auto-reset: wake one waiter or set the flag for the next waiter.
         if (!LIST_IS_EMPTY(&event->WaitList)) {
             LIST_ENTRY* node = ListPopHead(&event->WaitList);
             THREAD* t = CONTAINING_RECORD(node, THREAD, SchedulerLink);
-            KeReleaseSpinlock(&event->Lock);
+            KeReleaseSpinlock(&event->Lock, flags);
             KeUnblockThread(t);
             return;
         }
         event->Signaled = 1;
     }
-    KeReleaseSpinlock(&event->Lock);
+    KeReleaseSpinlock(&event->Lock, flags);
 }
 
 void KeClearEvent(EVENT* event) {
     if (!event) return;
-    KeAcquireSpinlock(&event->Lock);
+    uintptr_t flags = KeAcquireSpinlock(&event->Lock);
     event->Signaled = 0;
-    KeReleaseSpinlock(&event->Lock);
+    KeReleaseSpinlock(&event->Lock, flags);
 }
 
 KSTATUS KeWaitForEvent(EVENT* event) {
@@ -59,14 +57,14 @@ KSTATUS KeWaitForEvent(EVENT* event) {
     THREAD* self = KeCurrentThread();
 
     for (;;) {
-        KeAcquireSpinlock(&event->Lock);
+        uintptr_t flags = KeAcquireSpinlock(&event->Lock);
         if (event->Signaled) {
             if (event->Type == EventAutoReset) event->Signaled = 0;
-            KeReleaseSpinlock(&event->Lock);
+            KeReleaseSpinlock(&event->Lock, flags);
             return STATUS_SUCCESS;
         }
         ListInsertTail(&event->WaitList, &self->SchedulerLink);
-        KeReleaseSpinlock(&event->Lock);
+        KeReleaseSpinlock(&event->Lock, flags);
         KeBlockThread(self, &event->Header);
     }
 }