Manual Pages  — AGP

typedef struct _agp_info {
        agp_version version;  /* version of the driver        */
        uint32_t bridge_id;   /* bridge vendor/device         */
        uint32_t agp_mode;    /* mode info of bridge          */
        off_t aper_base;      /* base of aperture             */
        size_t aper_size;     /* size of aperture             */
        size_t pg_total;      /* max pages (swap + system)    */
        size_t pg_system;     /* max pages (system)           */
        size_t pg_used;       /* current pages used           */
} agp_info;

typedef struct _agp_setup {
        uint32_t agp_mode;    /* mode info of bridge */
} agp_setup;

The mode bits are defined in <sys/agpio.h>.

typedef struct _agp_allocate {
        int key;              /* tag of allocation            */
        size_t pg_count;      /* number of pages              */
        uint32_t type;        /* 0 == normal, other devspec   */
        uint32_t physical;    /* device specific (some devices
                               * need a phys address of the
                               * actual page behind the gatt
                               * table)                       */
} agp_allocate;

Returns a handle to the allocated memory.

typedef struct _agp_bind {
        int key;         /* tag of allocation            */
        off_t pg_start;  /* starting page to populate    */
} agp_bind;

The tag of allocation is the handle returned by AGPIOC_ALLOCATE.

typedef struct _agp_unbind {
        int key;                /* tag of allocation         */
        uint32_t priority;      /* priority for paging out   */
} agp_unbind;