178 lines
5.6 KiB
Groff
178 lines
5.6 KiB
Groff
.\" Copyright (c) 2001 Yar Tikhiy
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 28, 2007
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.Dt AGP 4
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.Os
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.Sh NAME
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.Nm agp
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.Nd "generic interface to the Accelerated Graphics Port (AGP)"
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.Sh SYNOPSIS
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.Cd "device agp"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides uniform, abstract methods for controlling
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the following devices:
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.Pp
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.Bl -tag -width "NVIDIA:" -compact
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.It Ali:
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M1541, M1621 and M1671 host to AGP bridges
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.It AMD:
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751, 761 and 762 host to AGP bridges
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.It ATI:
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RS100, RS200, RS250 and RS300 AGP bridges
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.It Intel:
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i820, i840, i845, i850, and i860 host to AGP bridges
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.It Intel:
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i810, i810-DC100, i810E, i815, 830M, 845G, 845M, 852GM, 852GME, 855GM, 855GME, 865G, 915G and 915GM SVGA controllers
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.It Intel:
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82443BX, 82443GX, 82443LX, 82815, 82820, 82830, 82840, 82845, 82845G, 82850, 82855, 82855GM, 82860, 82865, 82875P, E7205 and E7505 host to AGP bridges
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.It NVIDIA:
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nForce and nForce2 AGP controllers
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.It SiS:
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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
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.It VIA:
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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
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.El
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.Pp
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The most common application of
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.Nm
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is for running
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.Xr X 7
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on the Intel i81x controllers.
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.Sh IOCTLS
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The following
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.Xr ioctl 2
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operations can be performed on
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.Pa /dev/agpgart ,
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which are defined in
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.In sys/agpio.h :
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.Bl -tag -width indent
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.It Dv AGPIOC_INFO
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Returns state of the
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.Nm
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system.
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The result is a pointer to the following structure:
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.Bd -literal
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typedef struct _agp_info {
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agp_version version; /* version of the driver */
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u_int32_t bridge_id; /* bridge vendor/device */
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u_int32_t agp_mode; /* mode info of bridge */
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off_t aper_base; /* base of aperture */
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size_t aper_size; /* size of aperture */
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size_t pg_total; /* max pages (swap + system) */
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size_t pg_system; /* max pages (system) */
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size_t pg_used; /* current pages used */
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} agp_info;
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.Ed
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.It Dv AGPIOC_ACQUIRE
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Acquire control of the AGP chipset for use by this client.
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Returns
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.Er EBUSY
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if the AGP chipset is already acquired by another client.
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.It Dv AGPIOC_RELEASE
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Release control of the AGP chipset.
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This does not unbind or free any allocated memory, which is the
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responsibility of the client to handle if necessary.
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.It Dv AGPIOC_SETUP
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Enable the AGP hardware with the relevant mode.
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This
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.Xr ioctl 2
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takes the following structure:
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.Bd -literal
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typedef struct _agp_setup {
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u_int32_t agp_mode; /* mode info of bridge */
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} agp_setup;
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.Ed
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.Pp
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The mode bits are defined in
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.In sys/agpio.h .
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.It Dv AGPIOC_ALLOCATE
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Allocate physical memory suitable for mapping into the AGP aperture.
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This
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.Xr ioctl 2
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takes the following structure:
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.Bd -literal
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typedef struct _agp_allocate {
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int key; /* tag of allocation */
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size_t pg_count; /* number of pages */
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u_int32_t type; /* 0 == normal, other devspec */
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u_int32_t physical; /* device specific (some devices
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* need a phys address of the
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* actual page behind the gatt
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* table) */
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} agp_allocate;
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.Ed
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.Pp
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Returns a handle to the allocated memory.
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.It Dv AGPIOC_DEALLOCATE
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Free the previously allocated memory associated with the handle passed.
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.It Dv AGPIOC_BIND
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Bind the allocated memory at given offset with the AGP aperture.
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Returns
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.Er EINVAL
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if the memory is already bound or the offset is not at AGP page boundary.
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This
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.Xr ioctl 2
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takes the following structure:
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.Bd -literal
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typedef struct _agp_bind {
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int key; /* tag of allocation */
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off_t pg_start; /* starting page to populate */
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} agp_bind;
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.Ed
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.Pp
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The tag of allocation is the handle returned by
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.Dv AGPIOC_ALLOCATE .
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.It Dv AGPIOC_UNBIND
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Unbind memory from the AGP aperture.
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Returns
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.Er EINVAL
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if the memory is not bound.
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This
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.Xr ioctl 2
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takes the following structure:
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.Bd -literal
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typedef struct _agp_unbind {
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int key; /* tag of allocation */
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u_int32_t priority; /* priority for paging out */
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} agp_unbind;
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.Ed
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /dev/agpgart" -compact
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.It Pa /dev/agpgart
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AGP device node.
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.El
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.Sh SEE ALSO
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.Xr X 7 Pq Pa ports/x11/xorg
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 4.1 .
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