Add basic USB support sorta

src/usb.h

@@ -0,0 +1,32 @@
+/* Copyright holders: Melissa Goad
+   see COPYING for more details
+*/
+
+typedef struct
+{
+    uint8_t pid; //low 4 bits are the real pid, top 4 bits are just ~pid
+    uint8_t dev_addr;
+    uint8_t dev_endpoint;
+    uint8_t* data;
+    int len;
+    void* device;
+} usb_packet_t;
+
+typedef enum
+{
+    USB_DEV_TYPE_NONE = 0,
+    USB_DEV_TYPE_MOUSE,
+    USB_DEV_TYPE_TABLET,
+    USB_DEV_TYPE_KEYPAD,
+    USB_DEV_TYPE_DISK,
+    USB_DEV_TYPE_CDROM,
+    USB_DEV_TYPE_HUB,
+    USB_DEV_TYPE_PRINTER
+} usb_device_type_t;
+
+typedef enum
+{
+    USB_PID_TOKEN_SETUP = 0x2d,
+    USB_PID_TOKEN_IN = 0x69,
+    USB_PID_TOKEN_OUT = 0xe1
+} usb_pid_type_t;