Implement lock IRQ nesting via stack variables/contexts

kernel/sys/irq.h

@@ -1,7 +1,9 @@
 #ifndef _KERNEL_SYS_IRQ_H
 #define _KERNEL_SYS_IRQ_H
 
-void irq_save (void);
-void irq_restore (void);
+#include <sys/spin_lock.h>
+
+void irq_save (spin_lock_ctx_t* ctx);
+void irq_restore (spin_lock_ctx_t* ctx);
 
 #endif // _KERNEL_SYS_IRQ_H

kernel/sys/spin_lock.h

@@ -1,6 +1,12 @@
 #ifndef _KERNEL_SYS_SPIN_LOCK_H
 #define _KERNEL_SYS_SPIN_LOCK_H
 
+#include <libk/std.h>
+
+#if defined(__x86_64__)
+typedef uint64_t spin_lock_ctx_t;
+#endif
+
 void spin_lock_relax (void);
 
 #endif // _KERNEL_SYS_SPIN_LOCK_H