stos/amd64: intr: Add IRQL management

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-06-23 22:01:52 +00:00
parent 22beed638d
commit 114cc434d2
4 changed files with 88 additions and 2 deletions
@@ -8,6 +8,7 @@

 #include <hal/intr.h>
 #include <machine/idt.h>
+#include <ke/knot.h>
 #include <stdef.h>

 /* Interrupt priority level shift */
@@ -16,6 +17,20 @@
 /* Globals */
 static INTR_HANDLER Handlers[256];

+/*
+ * Set a new IRQL
+ */
+static inline VOID
+SetIrql(IRQL Irql)
+{
+    ASMV(
+        "mov %0, %%cr8"
+        :
+        : "r" ((UQUAD)Irql)
+        : "memory"
+    );
+}
+
 ST_STATUS
 HalRegisterIntr(const INTR_HANDLER *Handler, BOOLEAN IsUser)
 {
@@ -74,3 +89,45 @@ HalRegisterIntr(const INTR_HANDLER *Handler, BOOLEAN IsUser)
    /* No entry found */
    return STATUS_NOT_FOUND;
 }
+
+IRQL
+HalGetIrql(VOID)
+{
+    UQUAD CurrentIrql;
+
+    ASMV(
+        "mov %%cr8, %0"
+        : "=r" (CurrentIrql)
+        :
+        : "memory"
+    );
+
+    return (IRQL)CurrentIrql;
+}
+
+IRQL
+HalRaiseIrql(IRQL Irql)
+{
+    IRQL CurrentIrql;
+
+    CurrentIrql = HalGetIrql();
+    if (Irql < CurrentIrql) {
+        KeKnot(IRQL_NOT_GTE, "got bad irql\n");
+    }
+
+    SetIrql(Irql);
+    return CurrentIrql;
+}
+
+IRQL
+HalLowerIrql(IRQL Irql)
+{
+    IRQL CurrentIrql;
+
+    CurrentIrql = HalGetIrql();
+    if (Irql > CurrentIrql) {
+        KeKnot(IRQL_NOT_LTE, "got bad irql\n");
+    }
+
+    return CurrentIrql;
+}