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

code/kernel/mm_phys.c

@@ -36,11 +36,11 @@ static FRAME_STACK gFrameStack;
 
 // Push a physical frame address onto the stack.
 static void PushFrame(PHYSICAL_ADDRESS frame) {
-    KeAcquireSpinlock(&gFrameStack.Lock);
+    uintptr_t flags = KeAcquireSpinlock(&gFrameStack.Lock);
     if (gFrameStack.Top < gFrameStack.Capacity) {
         gFrameStack.Stack[gFrameStack.Top++] = frame;
     }
-    KeReleaseSpinlock(&gFrameStack.Lock);
+    KeReleaseSpinlock(&gFrameStack.Lock, flags);
 }
 
 // ---------------------------------------------------------------------------
@@ -104,32 +104,32 @@ void MmInitializePhysical(const MEMORY_MAP* map, uint64_t physicalWindowBase) {
 // Public API
 // ---------------------------------------------------------------------------
 PHYSICAL_ADDRESS MmAllocateFrame(void) {
-    KeAcquireSpinlock(&gFrameStack.Lock);
+    uintptr_t flags = KeAcquireSpinlock(&gFrameStack.Lock);
     if (gFrameStack.Top == 0) {
-        KeReleaseSpinlock(&gFrameStack.Lock);
+        KeReleaseSpinlock(&gFrameStack.Lock, flags);
         return (PHYSICAL_ADDRESS)0;
     }
     PHYSICAL_ADDRESS frame = gFrameStack.Stack[--gFrameStack.Top];
-    KeReleaseSpinlock(&gFrameStack.Lock);
+    KeReleaseSpinlock(&gFrameStack.Lock, flags);
     return frame;
 }
 
 void MmFreeFrame(PHYSICAL_ADDRESS frame) {
     if (!frame || (frame & (PAGE_SIZE - 1))) return;
-    KeAcquireSpinlock(&gFrameStack.Lock);
+    uintptr_t flags = KeAcquireSpinlock(&gFrameStack.Lock);
     if (gFrameStack.Top < gFrameStack.Capacity)
         gFrameStack.Stack[gFrameStack.Top++] = frame;
     // else: stack full — leak rather than corrupt
-    KeReleaseSpinlock(&gFrameStack.Lock);
+    KeReleaseSpinlock(&gFrameStack.Lock, flags);
 }
 
 PHYSICAL_ADDRESS MmAllocateContiguous(size_t count) {
     if (!count) return (PHYSICAL_ADDRESS)0;
 
-    KeAcquireSpinlock(&gFrameStack.Lock);
+    uintptr_t flags = KeAcquireSpinlock(&gFrameStack.Lock);
 
     if (gFrameStack.Top < count) {
-        KeReleaseSpinlock(&gFrameStack.Lock);
+        KeReleaseSpinlock(&gFrameStack.Lock, flags);
         return (PHYSICAL_ADDRESS)0;
     }
 
@@ -152,7 +152,7 @@ PHYSICAL_ADDRESS MmAllocateContiguous(size_t count) {
     }
 
     if (run == (size_t)-1) {
-        KeReleaseSpinlock(&gFrameStack.Lock);
+        KeReleaseSpinlock(&gFrameStack.Lock, flags);
         return (PHYSICAL_ADDRESS)0;
     }
 
@@ -164,7 +164,7 @@ PHYSICAL_ADDRESS MmAllocateContiguous(size_t count) {
         gFrameStack.Stack[run + i] = gFrameStack.Stack[run + count + i];
     gFrameStack.Top -= count;
 
-    KeReleaseSpinlock(&gFrameStack.Lock);
+    KeReleaseSpinlock(&gFrameStack.Lock, flags);
     return base;
 }