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

     /*
      * fbif.h -- Xen virtual frame buffer device
      *
      * 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_FBIF_H__
    #define __XEN_PUBLIC_IO_FBIF_H__
    
    /* Out events (frontend -> backend) */
    
    /*
     * Out events may be sent only when requested by backend, and receipt
     * of an unknown out event is an error.
     */
    
    /* Event type 1 currently not used */
    /*
     * Framebuffer update notification event
     * Capable frontend sets feature-update in xenstore.
     * Backend requests it by setting request-update in xenstore.
     */
    #define XENFB_TYPE_UPDATE 2
    
    struct xenfb_update
    {
        uint8_t type;    /* XENFB_TYPE_UPDATE */
        int32_t x;      /* source x */
        int32_t y;      /* source y */
        int32_t width;  /* rect width */
        int32_t height; /* rect height */
    };
    
    /*
     * Framebuffer resize notification event
     * Capable backend sets feature-resize in xenstore.
     */
    #define XENFB_TYPE_RESIZE 3
    
    struct xenfb_resize
    {
        uint8_t type;    /* XENFB_TYPE_RESIZE */
        int32_t width;   /* width in pixels */
        int32_t height;  /* height in pixels */
        int32_t stride;  /* stride in bytes */
        int32_t depth;   /* depth in bits */
        int32_t offset;  /* offset of the framebuffer in bytes */
    };
    
    #define XENFB_OUT_EVENT_SIZE 40
    
    union xenfb_out_event
    {
        uint8_t type;
        struct xenfb_update update;
        struct xenfb_resize resize;
        char pad[XENFB_OUT_EVENT_SIZE];
    };
    
    /* In events (backend -> frontend) */
    
    /*
     * Frontends should ignore unknown in events.
     */
    
    /*
     * Framebuffer refresh period advice
     * Backend sends it to advise the frontend their preferred period of
     * refresh.  Frontends that keep the framebuffer constantly up-to-date
     * just ignore it.  Frontends that use the advice should immediately
     * refresh the framebuffer (and send an update notification event if
     * those have been requested), then use the update frequency to guide
     * their periodical refreshs.
     */
    #define XENFB_TYPE_REFRESH_PERIOD 1
    #define XENFB_NO_REFRESH 0
    
    struct xenfb_refresh_period
    {
        uint8_t type;    /* XENFB_TYPE_UPDATE_PERIOD */
       uint32_t period; /* period of refresh, in ms,
                         * XENFB_NO_REFRESH if no refresh is needed */
   };
   
   #define XENFB_IN_EVENT_SIZE 40
   
   union xenfb_in_event
   {
       uint8_t type;
       struct xenfb_refresh_period refresh_period;
       char pad[XENFB_IN_EVENT_SIZE];
   };
   
   /* shared page */
   
   #define XENFB_IN_RING_SIZE 1024
   #define XENFB_IN_RING_LEN (XENFB_IN_RING_SIZE / XENFB_IN_EVENT_SIZE)
   #define XENFB_IN_RING_OFFS 1024
   #define XENFB_IN_RING(page) \
       ((union xenfb_in_event *)((char *)(page) + XENFB_IN_RING_OFFS))
   #define XENFB_IN_RING_REF(page, idx) \
       (XENFB_IN_RING((page))[(idx) % XENFB_IN_RING_LEN])
   
   #define XENFB_OUT_RING_SIZE 2048
   #define XENFB_OUT_RING_LEN (XENFB_OUT_RING_SIZE / XENFB_OUT_EVENT_SIZE)
   #define XENFB_OUT_RING_OFFS (XENFB_IN_RING_OFFS + XENFB_IN_RING_SIZE)
   #define XENFB_OUT_RING(page) \
       ((union xenfb_out_event *)((char *)(page) + XENFB_OUT_RING_OFFS))
   #define XENFB_OUT_RING_REF(page, idx) \
       (XENFB_OUT_RING((page))[(idx) % XENFB_OUT_RING_LEN])
   
   struct xenfb_page
   {
       uint32_t in_cons, in_prod;
       uint32_t out_cons, out_prod;
   
       int32_t width;          /* the width of the framebuffer (in pixels) */
       int32_t height;         /* the height of the framebuffer (in pixels) */
       uint32_t line_length;   /* the length of a row of pixels (in bytes) */
       uint32_t mem_length;    /* the length of the framebuffer (in bytes) */
       uint8_t depth;          /* the depth of a pixel (in bits) */
   
       /*
        * Framebuffer page directory
        *
        * Each directory page holds PAGE_SIZE / sizeof(*pd)
        * framebuffer pages, and can thus map up to PAGE_SIZE *
        * PAGE_SIZE / sizeof(*pd) bytes.  With PAGE_SIZE == 4096 and
        * sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2 Megs
        * 64 bit.  256 directories give enough room for a 512 Meg
        * framebuffer with a max resolution of 12,800x10,240.  Should
        * be enough for a while with room leftover for expansion.
        */
       unsigned long pd[256];
   };
   
   /*
    * Wart: xenkbd needs to know default resolution.  Put it here until a
    * better solution is found, but don't leak it to the backend.
    */
   #ifdef __KERNEL__
   #define XENFB_WIDTH 800
   #define XENFB_HEIGHT 600
   #define XENFB_DEPTH 32
   #endif
   
   #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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