init commit

arch/x86_64/kcall.h

@@ -0,0 +1,21 @@
+#ifndef _ELIBC_X86_64_KCALL_H
+#define _ELIBC_X86_64_KCALL_H
+
+#include <arch/generic/kcall.h>
+
+/* x86_64: placeholder — Elyz kernel ABI not yet defined.
+ *
+ * When the ABI exists this will contain either:
+ *   - a direct userspace→actor message-pipe write, or
+ *   - a lightweight kernel entry that routes via the PMRouter.
+ *
+ * For now: return -ENOSYS and let the CPU halt.
+ */
+static inline long __kcall(struct elyz_kcall *msg)
+{
+    (void)msg;
+    for (;;) __asm__ volatile("hlt");
+    return -38; /* -ENOSYS */
+}
+
+#endif