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

 

NAME

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

SYNOPSIS

      device agp
 

DESCRIPTION

      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 bridges
      Intel:   i810, i810-DC100, i810E, i815, 830M, 845G, 845M, 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, E7205 and
               E7505 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
      controllers.
 

IOCTLS

      The following ioctl(2) operations can be performed on /dev/agpgart, which
      are defined in
 
      AGPIOC_INFO
              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;
 
      AGPIOC_ACQUIRE
              Acquire control of the AGP chipset for use by this client.
              Returns EBUSY if the AGP chipset is already acquired by another
              client.
 
      AGPIOC_RELEASE
              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.
 
      AGPIOC_SETUP
              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
 
      AGPIOC_ALLOCATE
              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.
 
      AGPIOC_DEALLOCATE
              Free the previously allocated memory associated with the handle
              passed.
 
      AGPIOC_BIND
              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
              structure:
 
              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.
 
      AGPIOC_UNBIND
              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;
 

FILES

      /dev/agpgart  AGP device node.
      X(7) (ports/x11/xorg)
 

HISTORY

      The agp driver first appeared in FreeBSD 4.1.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.