XHCI store pdevice configs, ifs and endpoints as static length arrays

kernel/device/usb/usb.h

@@ -77,6 +77,29 @@ struct usb_endpoint_desc {
   uint8_t interval;
 } PACKED;
 
+#define USB_CBW_SIGNATURE 0x43425355
+
+/* command block wrapper */
+struct usb_cbw {
+  uint32_t signature;
+  uint32_t tag;
+  uint32_t length;
+  uint8_t dir;
+  uint8_t lun;
+  uint8_t cmd_len;
+  uint8_t data[16];
+} PACKED;
+
+#define USB_CSW_SIGNATURE 0x53425355
+
+/* command status wrapper */
+struct usb_csw {
+  uint32_t signature;
+  uint32_t tag;
+  uint32_t residue;
+  uint8_t status;
+};
+
 struct usb_driver_info {
   uint8_t if_class;
   uint8_t if_subclass;