feat(pl/ke): initial amd64 support

src/kern/panic.zig

@@ -3,10 +3,13 @@ const b = @import("base");
 const ke = b.ke;
 const ki = ke.private;
 
-/// Panics!
-pub fn panic(comptime fmt: []const u8, args: anytype) noreturn {
-    // FIXME: this is probably broken.
-    std.log.err("KERNEL PANIC: " ++ fmt, args);
+pub fn panic(
+    msg: []const u8,
+    first_trace_addr: ?usize,
+) noreturn {
+    _ = first_trace_addr;
+
+    std.log.err("KERNEL PANIC: {s}", .{msg});
 
     while (true) {}
 }