stos/amd64: intr: Add IRQL management

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/stos/head/hal/intr.h

@@ -69,4 +69,27 @@ typedef struct {
  */
 ST_STATUS HalRegisterIntr(const INTR_HANDLER *Handler, BOOLEAN IsUser);
 
+/*
+ * Returns the current IRQL
+ */
+IRQL HalGetIrql(VOID);
+
+/*
+ * Raise the IRQL level to a higher level
+ *
+ * @Irql: IRQL to raise to
+ *
+ * Returns the previous IRQL
+ */
+IRQL HalRaiseIrql(IRQL Irql);
+
+/*
+ * Lower the IRQL level to a lower level
+ *
+ * @Irql: IRQL to lower to
+ *
+ * Returns the previous IRQL
+ */
+IRQL HalLowerIrql(IRQL Irql);
+
 #endif  /* !_HAL_INTR_H_ */

paw/stos/head/ke/knot.h

@@ -19,13 +19,17 @@
  * @KNOT_BAD_BOOT_PROTO:    Bad boot protocol
  * @KNOT_OOM:               Fatal out of memory
  * @KNOT_EXCEPTION:         Fatal exception
+ * @IRQL_NOT_LTE:           IRQL not less than or equal
+ * @IRQL_NOT_GTE:           IRQL not greater than or equal
  */
 typedef enum {
     KNOT_MISC,
     KNOT_UNBOUND_RSRC,
     KNOT_BAD_BOOT_PROTO,
     KNOT_OOM,
-    KNOT_EXCEPTION
+    KNOT_EXCEPTION,
+    IRQL_NOT_LTE,
+    IRQL_NOT_GTE
 } KNOT_REASON;
 
 /*