FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/io/kbdif.h

     /*
      * kbdif.h -- Xen virtual keyboard/mouse
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      * sell copies of the Software, and to permit persons to whom the Software is
      * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
     * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
     */
    
    #ifndef __XEN_PUBLIC_IO_KBDIF_H__
    #define __XEN_PUBLIC_IO_KBDIF_H__
    
    /* In events (backend -> frontend) */
    
    /*
     * Frontends should ignore unknown in events.
     */
    
    /* Pointer movement event */
    #define XENKBD_TYPE_MOTION  1
    /* Event type 2 currently not used */
    /* Key event (includes pointer buttons) */
    #define XENKBD_TYPE_KEY     3
    /*
     * Pointer position event
     * Capable backend sets feature-abs-pointer in xenstore.
     * Frontend requests ot instead of XENKBD_TYPE_MOTION by setting
     * request-abs-update in xenstore.
     */
    #define XENKBD_TYPE_POS     4
    
    struct xenkbd_motion
    {
        uint8_t type;        /* XENKBD_TYPE_MOTION */
        int32_t rel_x;       /* relative X motion */
        int32_t rel_y;       /* relative Y motion */
        int32_t rel_z;       /* relative Z motion (wheel) */
    };
    
    struct xenkbd_key
    {
        uint8_t type;         /* XENKBD_TYPE_KEY */
        uint8_t pressed;      /* 1 if pressed; 0 otherwise */
        uint32_t keycode;     /* KEY_* from linux/input.h */
    };
    
    struct xenkbd_position
    {
        uint8_t type;        /* XENKBD_TYPE_POS */
        int32_t abs_x;       /* absolute X position (in FB pixels) */
        int32_t abs_y;       /* absolute Y position (in FB pixels) */
        int32_t rel_z;       /* relative Z motion (wheel) */
    };
    
    #define XENKBD_IN_EVENT_SIZE 40
    
    union xenkbd_in_event
    {
        uint8_t type;
        struct xenkbd_motion motion;
        struct xenkbd_key key;
        struct xenkbd_position pos;
        char pad[XENKBD_IN_EVENT_SIZE];
    };
    
    /* Out events (frontend -> backend) */
    
    /*
     * Out events may be sent only when requested by backend, and receipt
     * of an unknown out event is an error.
     * No out events currently defined.
     */
    
    #define XENKBD_OUT_EVENT_SIZE 40
    
    union xenkbd_out_event
    {
        uint8_t type;
        char pad[XENKBD_OUT_EVENT_SIZE];
    };
    
    /* shared page */
    
   #define XENKBD_IN_RING_SIZE 2048
   #define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
   #define XENKBD_IN_RING_OFFS 1024
   #define XENKBD_IN_RING(page) \
       ((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
   #define XENKBD_IN_RING_REF(page, idx) \
       (XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
   
   #define XENKBD_OUT_RING_SIZE 1024
   #define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
   #define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
   #define XENKBD_OUT_RING(page) \
       ((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
   #define XENKBD_OUT_RING_REF(page, idx) \
       (XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
   
   struct xenkbd_page
   {
       uint32_t in_cons, in_prod;
       uint32_t out_cons, out_prod;
   };
   
   #endif
   
   /*
    * Local variables:
    * mode: C
    * c-file-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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