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Provided by: freebsd-manpages_6.0-5_all
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 host-to-AGP bridge AMD 751 and 761 host-to-AGP bridges Intel i820, i840, i845, i850, and i860 host-to-AGP bridge Intel i810, i810-DC100, i810E, and i815 SVGA controllers Intel 82443GX host-to-AGP bridge SiS 5591 host-to-AGP bridge XFree86(1) on the Intel i81x controllers. 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 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‐ 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 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‐ 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.