247 lines
7.3 KiB
Groff
247 lines
7.3 KiB
Groff
.\" $NetBSD: agp.4,v 1.16 2010/10/03 06:36:49 wiz Exp $
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.\"
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.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Gregory McGarry.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 3, 2010
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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 accelerated graphics port driver
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.Sh SYNOPSIS
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.Cd "agp* at pchb?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides machine-independent support for the accelerated
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graphics port (AGP) found on many PC-based and PCI systems.
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The AGP specification was designed by Intel.
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.Pp
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The AGP chipset is positioned between the PCI-Host bridge and the
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graphics accelerator to provide a high-performance dedicated graphics
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bus for moving large amounts of data directly from host memory to the
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graphics accelerator.
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The specification currently supports a peak bandwidth of 528 MB/s.
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AGP uses a Graphics Address Remapping Table (GART) to provide a
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physically-contiguous view of scattered pages in host memory for
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DMA transfers.
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.Pp
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The
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.Nm
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driver supports the following chipsets:
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.Pp
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.Bl -dash -compact -offset indent
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.It
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ALI M1541 host-to-AGP bridge
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.It
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AMD 751 and 761 host-to-AGP bridges
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.It
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Intel 82810, 82810-DC100, 82810E, and 82815 SVGA controllers
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.It
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SiS 5591 host-to-AGP bridge
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.It
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VIA
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.El
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.Pp
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The
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.Nm
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driver also provides an interface to user processes for use by X
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servers.
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A user process communicates to the device initially by means of
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.Xr ioctl 2
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calls.
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The calls supported are:
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.Bl -tag -width indent
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.It Dv AGPIOC_INFO
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Get AGP information, setting the members in the
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.Em agp_info
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structure as defined in \*[Lt]sys/agpio.h\*[Gt]:
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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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uint32_t bridge_id; /* bridge vendor/device */
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uint32_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 AGP.
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.It Dv AGPIOC_RELEASE
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Release AGP.
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.It Dv AGPIOC_SETUP
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Set up AGP, using the members in the
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.Em agp_setup
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structure as defined in \*[Lt]sys/agpio.h\*[Gt]:
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.Bd -literal
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typedef struct _agp_setup {
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uint32_t agp_mode; /* mode info of bridge */
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} agp_setup;
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.Ed
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.It Dv AGPIOC_ALLOCATE
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Allocate AGP space, using and setting the members in the
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.Em agp_allocate
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structure as defined in \*[Lt]sys/agpio.h\*[Gt]:
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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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uint32_t type; /* 0 == normal, other devspec */
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uint32_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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.It Dv AGPIOC_DEALLOCATE
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Deallocate AGP space.
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.It Dv AGPIOC_BIND
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Bind AGP space, using the members in the
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.Em agp_bind
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structure as defined in \*[Lt]sys/agpio.h\*[Gt]:
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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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.It Dv AGPIOC_UNBIND
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Unbind AGP space, using the members in the
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.Em agp_unbind
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structure as defined in \*[Lt]sys/agpio.h\*[Gt]:
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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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uint32_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 /dev/agpgart -compact
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.It Pa /dev/agp?
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AGP GART device special files
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.It Pa /dev/agpgart
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AGP GART device special file
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.El
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.Sh EXAMPLES
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This short code fragment is an example of opening the AGP device
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and performing some basic operations:
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.Bd -literal
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#include \*[Lt]sys/types.h\*[Gt]
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#include \*[Lt]sys/ioctl.h\*[Gt]
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#include \*[Lt]sys/agpio.h\*[Gt]
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#include \*[Lt]fcntl.h\*[Gt]
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#include \*[Lt]err.h\*[Gt]
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int
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main(int argc, char **argv)
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{
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int fd;
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agp_info info;
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agp_allocate alloc;
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agp_setup setup;
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agp_bind bind;
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agp_unbind unbind;
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fd = open("/dev/agp0", O_RDWR);
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if (fd \*[Lt] 0)
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err(1, "open");
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if (ioctl(fd, AGPIOC_INFO, \*[Am]info) \*[Lt] 0)
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err(2, "ioctl AGPIOC_INFO");
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printf("version: %u.%u\\n", info.version.major,
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info.version.minor);
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printf("id: %x\\n", info.bridge_id);
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printf("mode: %x\\n", info.agp_mode);
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printf("base: %x\\n", info.aper_base);
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printf("size: %uM\\n", info.aper_size);
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printf("total mem: %u\\n", info.pg_total);
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printf("system mem: %u\\n", info.pg_system);
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printf("used mem: %u\\n\\n", info.pg_used);
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setup.agp_mode = info.agp_mode;
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if (ioctl(fd, AGPIOC_SETUP, \*[Am]setup) \*[Lt] 0)
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err(3, "ioctl AGPIOC_SETUP");
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if (ioctl(fd, AGPIOC_ACQUIRE, 0) \*[Lt] 0)
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err(3, "ioctl AGPIOC_ACQUIRE");
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alloc.type = 0;
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alloc.pg_count = 64;
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if (ioctl(fd, AGPIOC_ALLOCATE, \*[Am]alloc) \*[Lt] 0)
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err(4, "ioctl AGPIOC_ALLOCATE");
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printf("alloc key %d, paddr %x\\n", alloc.key, alloc.physical);
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if (ioctl(fd, AGPIOC_INFO, \*[Am]info) \*[Lt] 0)
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err(5, "ioctl AGPIOC_INFO");
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bind.key = alloc.key;
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bind.pg_start = 0x1000;
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if (ioctl(fd, AGPIOC_BIND, \*[Am]bind) \*[Lt] 0)
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err(6, "ioctl AGPIOC_BIND");
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printf("used mem now: %u\\n\\n", info.pg_used);
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unbind.key = alloc.key;
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unbind.priority = 0;
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if (ioctl(fd, AGPIOC_UNBIND, \*[Am]unbind) \*[Lt] 0)
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err(6, "ioctl AGPIOC_BIND");
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if (ioctl(fd, AGPIOC_DEALLOCATE, \*[Am]alloc.key) \*[Lt] 0)
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err(6, "ioctl AGPIOC_DEALLOCATE");
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if (ioctl(fd, AGPIOC_RELEASE, 0) \*[Lt] 0)
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err(7, "ioctl AGPIOC_RELEASE");
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close(fd);
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printf("agp test successful\\n");
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return 0;
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}
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.Ed
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr pci 4
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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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It was adopted in
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.Nx 1.6 .
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