2 files changed, 15 insertions, 0 deletions
diff --git a/src/sys/include/io/usb/xhciregs.h b/src/sys/include/io/usb/xhciregs.h
index 85a8630..726d883 100644
--- a/src/sys/include/io/usb/xhciregs.h
+++ b/src/sys/include/io/usb/xhciregs.h
@@ -85,6 +85,15 @@ struct __packed xhci_opregs {
 #define USBSTS_CNR  BIT(11)     /* Controller not ready */
 
 /*
+ * USB structural parameters 1 register bits
+ *
+ * See section 5.3.3 of the xHCI spec
+ */
+#define HCSPARAMS1_MAXSLOTS(HCSPARAMS1) ((HCSPARAMS1) & 0xFF)
+#define HCSPARAMS1_MAXINTRS(HCSPARAMS1) (((HCSPARAMS1) >> 8) & 0x7FF)
+#define HCSPARAMS1_MAXPORTS(HCSPARAMS1) (((HCSPARAMS1) >> 24) & 0xFF)
+
+/*
  * Macros to get various register spaces
  */
 #define XHCI_OPBASE(CAPBASE) \
diff --git a/src/sys/include/io/usb/xhcivar.h b/src/sys/include/io/usb/xhcivar.h
index c0b3a39..bc5f59b 100644
--- a/src/sys/include/io/usb/xhcivar.h
+++ b/src/sys/include/io/usb/xhcivar.h
@@ -37,9 +37,15 @@
  * Represents the host controller
  *
  * @io: I/O space
+ * @max_slots: Max device slots
+ * @max_intrs: Max interrupters
+ * @max_ports: Max ports
  */
 struct xhci_hcd {
     struct xhci_capregs *capspace;
+    uint8_t max_slots;
+    uint32_t max_intrs;
+    uint32_t max_ports;
 };
 
 #define XHCI_TIMEOUT_MSEC 500