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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.