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AGP(4)			 BSD 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 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

     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	   */
		     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;

	     Acquire control of	the AGP	chipset	for use	by this	client.	 Re-
	     turns 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 {
		     uint32_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		   */
		     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.

	     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	  */
		     uint32_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.

BSD			       November	28, 2007			   BSD


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