The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/pci/agpvar.h

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    1 /*-
    2  * Copyright (c) 2000 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      $FreeBSD: releng/5.0/sys/pci/agpvar.h 88185 2001-12-19 08:54:29Z mdodd $
   27  */
   28 
   29 #ifndef _PCI_AGPVAR_H_
   30 #define _PCI_AGPVAR_H_
   31 
   32 /*
   33  * The AGP chipset can be acquired by user or kernel code. If the
   34  * chipset has already been acquired, it cannot be acquired by another 
   35  * user until the previous user has released it.
   36  */
   37 enum agp_acquire_state {
   38         AGP_ACQUIRE_FREE,
   39         AGP_ACQUIRE_USER,
   40         AGP_ACQUIRE_KERNEL
   41 };
   42 
   43 /*
   44  * This structure is used to query the state of the AGP system.
   45  */
   46 struct agp_info {
   47         u_int32_t       ai_mode;
   48         vm_offset_t     ai_aperture_base;
   49         vm_size_t       ai_aperture_size;
   50         vm_offset_t     ai_aperture_va;
   51         vm_size_t       ai_memory_allowed;
   52         vm_size_t       ai_memory_used;
   53         u_int32_t       ai_devid;
   54 };
   55 
   56 struct agp_memory_info {
   57         vm_size_t       ami_size;       /* size in bytes */
   58         vm_offset_t     ami_physical;   /* bogus hack for i810 */
   59         vm_offset_t     ami_offset;     /* page offset if bound */
   60         int             ami_is_bound;   /* non-zero if bound */
   61 };
   62 
   63 /*
   64  * Find the AGP device and return it.
   65  */
   66 device_t agp_find_device(void);
   67 
   68 /*
   69  * Return the current owner of the AGP chipset.
   70  */
   71 enum agp_acquire_state agp_state(device_t dev);
   72 
   73 /*
   74  * Query the state of the AGP system.
   75  */
   76 void agp_get_info(device_t dev, struct agp_info *info);
   77 
   78 /*
   79  * Acquire the AGP chipset for use by the kernel. Returns EBUSY if the
   80  * AGP chipset is already acquired by another user. 
   81  */
   82 int agp_acquire(device_t dev);
   83 
   84 /*
   85  * Release the AGP chipset.
   86  */
   87 int agp_release(device_t dev);
   88 
   89 /*
   90  * Enable the agp hardware with the relavent mode. The mode bits are
   91  * defined in <pci/agpreg.h>
   92  */
   93 int agp_enable(device_t dev, u_int32_t mode);
   94 
   95 /*
   96  * Allocate physical memory suitable for mapping into the AGP
   97  * aperture.  The value returned is an opaque handle which can be
   98  * passed to agp_bind(), agp_unbind() or agp_deallocate().
   99  */
  100 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes);
  101 
  102 /*
  103  * Free memory which was allocated with agp_allocate().
  104  */
  105 void agp_free_memory(device_t dev, void *handle);
  106 
  107 /*
  108  * Bind memory allocated with agp_allocate() at a given offset within
  109  * the AGP aperture. Returns EINVAL if the memory is already bound or
  110  * the offset is not at an AGP page boundary.
  111  */
  112 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset);
  113 
  114 /*
  115  * Unbind memory from the AGP aperture. Returns EINVAL if the memory
  116  * is not bound.
  117  */
  118 int agp_unbind_memory(device_t dev, void *handle);
  119 
  120 /*
  121  * Retrieve information about a memory block allocated with
  122  * agp_alloc_memory().
  123  */
  124 void agp_memory_info(device_t dev, void *handle, struct agp_memory_info *mi);
  125 
  126 #endif /* !_PCI_AGPVAR_H_ */

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