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Rev 2014 Rev 2017
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    uint32_t frames;            /**< Available frames */
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    uint32_t frames;            /**< Available frames */
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    shared_info_t *shared_info; /**< Shared info structure (machine address) */
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    shared_info_t *shared_info; /**< Shared info structure (machine address) */
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    uint32_t flags;             /**< SIF_xxx flags */
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    uint32_t flags;             /**< SIF_xxx flags */
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    pfn_t store_mfn;            /**< Shared page (machine page) */
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    pfn_t store_mfn;            /**< Shared page (machine page) */
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    evtchn_t store_evtchn;      /**< Event channel for store communication */
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    evtchn_t store_evtchn;      /**< Event channel for store communication */
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    union {
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        struct {
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    pfn_t console_mfn;          /**< Console page (machine page) */
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            pfn_t mfn;          /**< Console page (machine page) */
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    evtchn_t console_evtchn;    /**< Event channel for console messages */
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            evtchn_t evtchn;    /**< Event channel for console messages */
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        } domU;
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        struct {
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            uint32_t info_off;  /**< Offset of console_info struct */
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            uint32_t info_size; /**< Size of console_info struct from start */
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        } dom0;
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    } console;
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    pte_t *ptl0;                /**< Boot PTL0 (kernel address) */
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    pte_t *ptl0;                /**< Boot PTL0 (kernel address) */
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    uint32_t pt_frames;         /**< Number of bootstrap page table frames */
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    uint32_t pt_frames;         /**< Number of bootstrap page table frames */
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    pfn_t *pm_map;              /**< Physical->machine frame map (kernel address) */
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    pfn_t *pm_map;              /**< Physical->machine frame map (kernel address) */
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    void *mod_start;            /**< Modules start (kernel address) */
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    void *mod_start;            /**< Modules start (kernel address) */
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    uint32_t mod_len;           /**< Modules size (bytes) */
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    uint32_t mod_len;           /**< Modules size (bytes) */
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    int8_t cmd_line[GUEST_CMDLINE];
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    int8_t cmd_line[GUEST_CMDLINE];
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} start_info_t;
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} start_info_t;
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#define XEN_CONSOLE_VGA     0x03
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#define XEN_CONSOLE_VESA    0x23
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typedef struct {
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    uint8_t video_type;  
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    union {
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        struct {
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            uint16_t font_height;
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            uint16_t cursor_x;
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            uint16_t cursor_y;
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            uint16_t rows;
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            uint16_t columns;
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        } vga;
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        struct {
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            uint16_t width;
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            uint16_t height;
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            uint16_t bytes_per_line;
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            uint16_t bits_per_pixel;
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            uint32_t lfb_base;
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            uint32_t lfb_size;
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            uint8_t red_pos;
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            uint8_t red_size;
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            uint8_t green_pos;
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            uint8_t green_size;
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            uint8_t blue_pos;
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            uint8_t blue_size;
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            uint8_t rsvd_pos;
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            uint8_t rsvd_size;
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        } vesa_lfb;
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    } info;
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} console_info_t;
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typedef struct {
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typedef struct {
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    pfn_t start;
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    pfn_t start;
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    pfn_t size;
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    pfn_t size;
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    pfn_t reserved;
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    pfn_t reserved;
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} memzone_t;
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} memzone_t;