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
<sys/agpio.h>:
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
<sys/agpio.h>.
AGPIOC_ALLOCATE
- Allocate physical memory suitable for mapping into the AGP
aperture. 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 memory 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.
SEE ALSO¶
X(7) (
ports/x11/xorg)
HISTORY¶
The
agp driver first appeared in
FreeBSD
4.1.