diff --git a/kernel/driver/usb/xhci/xhci.h b/kernel/driver/usb/xhci/xhci.h
index a85b63ae..2b86752d 100644
--- a/kernel/driver/usb/xhci/xhci.h
+++ b/kernel/driver/usb/xhci/xhci.h
@@ -14,14 +14,63 @@
 #define XHCI_CAPS_RTSOFF 0x18     // Runtime register space offset
 #define XHCI_CAPS_HCCPARAMS2 0x1c // capability params 2
 
-
 struct xhci_caps_HCSPARAMS1_reg_t
 {
     unsigned max_slots : 8;  // 最大插槽数
     unsigned max_intrs : 11; // 最大中断数
     unsigned reserved : 5;
     unsigned max_ports : 8; // 最大端口数
-}__attribute__((packed));
+} __attribute__((packed));
+
+struct xhci_caps_HCSPARAMS2_reg_t
+{
+    unsigned ist : 4;      // 同步调度阈值
+    unsigned ERST_Max : 4; // Event Ring Segment Table Max
+    unsigned Reserved : 13;
+    unsigned max_scratchpad_buf_HI5 : 5; // 草稿行buffer地址（高5bit）
+    unsigned spr : 1;                    // scratchpad restore
+    unsigned max_scratchpad_buf_LO5 : 5; // 草稿行buffer地址（低5bit）
+} __attribute__((packed));
+
+struct xhci_caps_HCSPARAMS3_reg_t
+{
+    uint8_t u1_device_exit_latency; // 0~10ms
+    uint8_t Reserved;
+    uint16_t u2_device_exit_latency; // 0~2047ms
+} __attribute__((packed));
+
+struct xhci_caps_HCCPARAMS1_reg_t
+{
+    unsigned ac64 : 1; // 64-bit addressing capability
+    unsigned bnc : 1;  // bw negotiation capability
+    unsigned csz : 1;  // context size
+    unsigned ppc : 1;  // 端口电源控制
+    unsigned pind : 1; // port indicators
+    unsigned lhrc : 1; // Light HC reset capability
+    unsigned ltc : 1;  // latency tolerance messaging capability
+    unsigned nss : 1;  // no secondary SID support
+
+    unsigned pae : 1;        // parse all event data
+    unsigned spc : 1;        // Stopped - Short packet capability
+    unsigned sec : 1;        // Stopped EDTLA capability
+    unsigned cfc : 1;        // Continuous Frame ID capability
+    unsigned MaxPSASize : 4; // Max Primary Stream Array Size
+
+    uint16_t xECP; // xhci extended capabilities pointer
+
+} __attribute__((packed));
+
+struct xhci_caps_HCCPARAMS2_reg_t
+{
+    unsigned u3c : 1; // U3 Entry Capability
+    unsigned cmc : 1; // ConfigEP command Max exit latency too large
+    unsigned fsc : 1; // Force Save Context Capability
+    unsigned ctc : 1; // Compliance Transition Capability
+    unsigned lec : 1; // large ESIT payload capability
+    unsigned cic : 1; // configuration information capability
+    unsigned Reserved : 26;
+} __attribute__((packed));
+
 
 
 /**