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

code/kernel/ke_queue.c

@@ -25,7 +25,7 @@ KSTATUS KeSendMessage(QUEUE* queue, const QUEUE_MESSAGE* msg, bool blocking) {
     THREAD* self = KeCurrentThread();
 
     for (;;) {
-        KeAcquireSpinlock(&queue->Lock);
+        uintptr_t flags = KeAcquireSpinlock(&queue->Lock);
         if (queue->Count < QUEUE_DEPTH) {
             queue->Ring[queue->Tail] = *msg;
             queue->Tail = (queue->Tail + 1) % QUEUE_DEPTH;
@@ -35,19 +35,19 @@ KSTATUS KeSendMessage(QUEUE* queue, const QUEUE_MESSAGE* msg, bool blocking) {
             if (!LIST_IS_EMPTY(&queue->RecvWaiters)) {
                 LIST_ENTRY* node = ListPopHead(&queue->RecvWaiters);
                 THREAD* t = CONTAINING_RECORD(node, THREAD, SchedulerLink);
-                KeReleaseSpinlock(&queue->Lock);
+                KeReleaseSpinlock(&queue->Lock, flags);
                 KeUnblockThread(t);
             } else {
-                KeReleaseSpinlock(&queue->Lock);
+                KeReleaseSpinlock(&queue->Lock, flags);
             }
             return STATUS_SUCCESS;
         }
         if (!blocking) {
-            KeReleaseSpinlock(&queue->Lock);
+            KeReleaseSpinlock(&queue->Lock, flags);
             return STATUS_QUEUE_FULL;
         }
         ListInsertTail(&queue->SendWaiters, &self->SchedulerLink);
-        KeReleaseSpinlock(&queue->Lock);
+        KeReleaseSpinlock(&queue->Lock, flags);
         KeBlockThread(self, &queue->Header);
     }
 }
@@ -57,7 +57,7 @@ KSTATUS KeReceiveMessage(QUEUE* queue, QUEUE_MESSAGE* msg, bool blocking) {
     THREAD* self = KeCurrentThread();
 
     for (;;) {
-        KeAcquireSpinlock(&queue->Lock);
+        uintptr_t flags = KeAcquireSpinlock(&queue->Lock);
         if (queue->Count > 0) {
             *msg = queue->Ring[queue->Head];
             queue->Head = (queue->Head + 1) % QUEUE_DEPTH;
@@ -67,19 +67,19 @@ KSTATUS KeReceiveMessage(QUEUE* queue, QUEUE_MESSAGE* msg, bool blocking) {
             if (!LIST_IS_EMPTY(&queue->SendWaiters)) {
                 LIST_ENTRY* node = ListPopHead(&queue->SendWaiters);
                 THREAD* t = CONTAINING_RECORD(node, THREAD, SchedulerLink);
-                KeReleaseSpinlock(&queue->Lock);
+                KeReleaseSpinlock(&queue->Lock, flags);
                 KeUnblockThread(t);
             } else {
-                KeReleaseSpinlock(&queue->Lock);
+                KeReleaseSpinlock(&queue->Lock, flags);
             }
             return STATUS_SUCCESS;
         }
         if (!blocking) {
-            KeReleaseSpinlock(&queue->Lock);
+            KeReleaseSpinlock(&queue->Lock, flags);
             return STATUS_QUEUE_EMPTY;
         }
         ListInsertTail(&queue->RecvWaiters, &self->SchedulerLink);
-        KeReleaseSpinlock(&queue->Lock);
+        KeReleaseSpinlock(&queue->Lock, flags);
         KeBlockThread(self, &queue->Header);
     }
 }