Index: sys/kern/subr_bus.c
===================================================================
--- sys/kern/subr_bus.c	(revision 276982)
+++ sys/kern/subr_bus.c	(working copy)
@@ -2991,6 +2991,18 @@ device_set_unit(device_t dev, int unit)
  * Some useful method implementations to make life easier for bus drivers.
  */
 
+typedef int (*resource_list_printer)(struct resource_list_entry *, int, const char *, int, const char *);
+
+struct rl_printer {
+	STAILQ_ENTRY(rl_printer) link;
+	resource_list_printer	callback;
+	int			type;
+};
+STAILQ_HEAD(rl_printer_head, rl_printer) rlp_head =
+    STAILQ_HEAD_INITIALIZER(rlp_head);
+MALLOC_DEFINE(M_RL_PRINT, "rl-print", "Resource list printint structures");
+void resource_list_print_register(int type, resource_list_printer cb);
+
 /**
  * @brief Initialise a resource list.
  *
@@ -3475,6 +3487,25 @@ resource_list_unreserve(struct resource_list *rl,
 	return (resource_list_release(rl, bus, child, type, rid, rle->res));
 }
 
+static int
+resource_list_print_default(struct resource_list_entry *rle, int printed,
+    const char *name, int type, const char *format)
+{
+	int retval = 0;
+
+	if (printed == 0)
+		retval += printf(" %s ", name);
+	else
+		retval += printf(",");
+	retval += printf(format, rle->start);
+	if (rle->count > 1) {
+		retval += printf("-");
+		retval += printf(format, rle->start + rle->count - 1);
+	}
+
+	return retval;
+}
+
 /**
  * @brief Print a description of resources in a resource list
  *
@@ -3495,29 +3526,42 @@ resource_list_print_type(struct resource_list *rl,
     const char *format)
 {
 	struct resource_list_entry *rle;
+	struct rl_printer *rlpe;
+	resource_list_printer cb;
 	int printed, retval;
 
+	cb = resource_list_print_default;
+	STAILQ_FOREACH(rlpe, &rlp_head, link) {
+		if (rlpe->type == type) {
+			cb = rlpe->callback;
+			break;
+		}
+	}
+
 	printed = 0;
 	retval = 0;
 	/* Yes, this is kinda cheating */
 	STAILQ_FOREACH(rle, rl, link) {
 		if (rle->type == type) {
-			if (printed == 0)
-				retval += printf(" %s ", name);
-			else
-				retval += printf(",");
+			retval += cb(rle, printed, name, type, format);
 			printed++;
-			retval += printf(format, rle->start);
-			if (rle->count > 1) {
-				retval += printf("-");
-				retval += printf(format, rle->start +
-						 rle->count - 1);
-			}
 		}
 	}
 	return (retval);
 }
 
+void
+resource_list_print_register(int type, resource_list_printer cb)
+{
+	struct rl_printer *rlpe;
+
+	rlpe = malloc(sizeof(struct rl_printer), M_RL_PRINT, M_ZERO);
+	rlpe->type = type;
+	rlpe->callback = cb;
+
+	STAILQ_INSERT_TAIL(&rlp_head, rlpe, link);
+}
+
 /**
  * @brief Releases all the resources in a list.
  *