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AGP(4)                 FreeBSD Kernel Interfaces Manual                 AGP(4)

     agp -- generic interface to the Accelerated Graphics Port (AGP)

     device agp

     The agp driver provides uniform, abstract methods for controlling the
     following devices:

     ALI:     M1541, M1621 and M1671 host to AGP bridges
     AMD:     751, 761 and 762 host to AGP bridges
     ATI:     RS100, RS200, RS250 and RS300 AGP bridges
     Intel:   i820, i840, i845, i850, and i860 host to AGP bridge
     Intel:   i810, i810-DC100, i810E, i815, 830M, 845G, 852GM, 852GME, 855GM,
              855GME, 865G, 915G and 915GM SVGA controllers
     Intel:   82443BX, 82443GX, 82443LX, 82815, 82820, 82830, 82840, 82845,
              82845G, 82850, 82855, 82855GM, 82860, 82865, 82875P and E7205
              host to AGP bridges
     NVIDIA:  nForce and nForce2 AGP controllers
     SiS:     530, 540, 550, 620, 630, 645, 645DX, 648, 650, 651, 655, 661,
              730, 735, 740, 741, 745, 746, 760 and 5591 host to AGP bridges
     VIA:     3296, 82C597, 82C598, 82C691, 82C694X, 82C8363, 8235, 8237,
              8361, 8367, 8371, 8377, 8501, 8601, 862x, 8633, 8653, 8703,
              8753, 8754, 8763, 8783, KT880, PM800, PM880, PN800, PN880,
              PT880, XM266 and XN266 host to PCI bridges

     The most common application of agp is for running X(7) on the Intel i81x

     The following ioctl(2) operations can be performed on /dev/agpgart, which
     are defined in <sys/agpio.h>:

             Returns state of the agp system.  The result is a pointer to the
             following structure:

             typedef struct _agp_info {
                     agp_version version;  /* version of the driver        */
                     u_int32_t bridge_id;  /* bridge vendor/device         */
                     u_int32_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;

             Acquire control of the AGP chipset for use by this client.
             Returns EBUSY if the AGP chipset is already acquired by another

             Release control of the AGP chipset.  This does not unbind or free
             any allocated memory, which is the responsibility of the client
             to handle if necessary.

             Enable the AGP hardware with the relevant mode.  This ioctl(2)
             takes the following structure:

             typedef struct _agp_setup {
                     u_int32_t agp_mode;   /* mode info of bridge */
             } agp_setup;

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

             Allocate physical memory suitable for mapping into the AGP aper-
             ture.  This ioctl(2) takes the following structure:

             typedef struct _agp_allocate {
                     int key;              /* tag of allocation            */
                     size_t pg_count;      /* number of pages              */
                     u_int32_t type;       /* 0 == normal, other devspec   */
                     u_int32_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.

             Free the previously allocated memory associated with the handle

             Bind the allocated memory at given offset with the AGP aperture.
             Returns EINVAL if the memory is already bound or the offset is
             not at AGP page boundary.  This ioctl(2) takes the following

             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.

             Unbind memory from the AGP aperture.  Returns EINVAL if the mem-
             ory is not bound.  This ioctl(2) takes the following structure:

             typedef struct _agp_unbind {
                     int key;                /* tag of allocation         */
                     u_int32_t priority;     /* priority for paging out   */
             } agp_unbind;

     /dev/agpgart  AGP device node.

     X(7) (ports/x11/xorg)

     The agp driver first appeared in FreeBSD 4.1.

FreeBSD 6.2                    December 20, 2005                   FreeBSD 6.2


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