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#define AGP_APBASE	0x10

#define AGPCMD		0x8

#define AGPNISTAT	0xc

#define AGPCTRL		0x10

#define AGPAPSIZE	0x14

#define AGPNEPG		0x16

#define AGPGARTLO	0x18

#define AGPGARTHI	0x1c

#define AGPNICMD	0x20

#define AGP_MINOR_VERSION_SHIFT	(16)

#define AGPSTAT_RQ_DEPTH_SHIFT	24

#define AGPSTAT_ARQSZ		(1<<15|1<<14|1<<13)

#define AGPSTAT_ARQSZ_SHIFT	13

#define AGPSTAT_AGP_ENABLE	(1<<8)

#define AGPSTAT_FW          (1<<4)

#define AGPSTAT_MODE_3_0	(1<<3)

#define AGPSTAT2_2X         (1<<1)

#define AGPSTAT2_4X         (1<<2)

#define AGPSTAT3_8X         (1<<1)

#define AGPSTAT3_4X         (1)

#define AGPCTRL_GTLBEN		(1<<7)

#define AGP3_RESERVED_MASK 0x00ff00c4

#define AGP_ERRATA_SBA	 1<<1

#define AGP_ERRATA_1X 1<<2

#define INTEL_APSIZE        0xb4

#define INTEL_ATTBASE       0xb8

#define INTEL_AGPCTRL       0xb0

#define INTEL_NBXCFG        0x50

#define INTEL_ERRSTS        0x91

#define INTEL_I845_AGPM		0x51

#define INTEL_I845_ERRSTS	0xc8

#define AGP_APBASE	0x10

{

    size_t    size;

    count_t   num_entries;

    count_t   pages_count;

    u32_t     size_value;

}aper_size_t;

{

    PCITAG    PciTag;

    aper_size_t    *current_size;

    aper_size_t    *previous_size;

    int             aperture_size_idx;

    addr_t          gatt_dma;

    addr_t          gart_addr;

    u32_t           mode;

    char            minor_version;

//   enum    aper_size_type size_type;

//    int     cant_use_aperture;

//    int     needs_scratch_page;

//    struct gatt_mask *masks;

    int     (*fetch_size)();

    int     (*configure)();

//    void    (*agp_enable)(struct agp_bridge_data *, u32);

//    void    (*cleanup)(void);

    void    (*tlb_flush)();

//    u32_t   (*mask_memory)(struct agp_bridge_data *,u32_t, int);

//    void    (*cache_flush)(void);

    int     (*create_gatt_table)();

//    int     (*free_gatt_table)(struct agp_bridge_data *);

//    int     (*insert_memory)(struct agp_memory *, off_t, int);

//    int     (*remove_memory)(struct agp_memory *, off_t, int);

//    struct  agp_memory *(*alloc_by_type) (size_t, int);

//    void    (*free_by_type)(struct agp_memory *);

//    void   *(*agp_alloc_page)(struct agp_bridge_data *);

//    void    (*agp_destroy_page)(void *);

}agp_t;