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 controllers.
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:
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:
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:
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:
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:
- /dev/agpgart
- AGP device node.
X(7) (
ports/x11/xorg)
The
agp driver first appeared in
FreeBSD 4.1.