sys/dev/agp/agpvar.h

   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: src/sys/pci/agpvar.h,v 1.1.2.2 2002/01/10 12:07:08 mdodd Exp $
  27  *      $DragonFly: src/sys/dev/agp/agpvar.h,v 1.2 2003/06/17 06:28:56 dillon Exp $
  28  */
  29
  30 #ifndef _PCI_AGPVAR_H_
  31 #define _PCI_AGPVAR_H_
  32
  33 /*
  34  * The AGP chipset can be acquired by user or kernel code. If the
  35  * chipset has already been acquired, it cannot be acquired by another
  36  * user until the previous user has released it.
  37  */
  38 enum agp_acquire_state {
  39         AGP_ACQUIRE_FREE,
  40         AGP_ACQUIRE_USER,
  41         AGP_ACQUIRE_KERNEL
  42 };
  43
  44 /*
  45  * This structure is used to query the state of the AGP system.
  46  */
  47 struct agp_info {
  48         u_int32_t       ai_mode;
  49         vm_offset_t     ai_aperture_base;
  50         vm_size_t       ai_aperture_size;
  51         vm_offset_t     ai_aperture_va;
  52         vm_size_t       ai_memory_allowed;
  53         vm_size_t       ai_memory_used;
  54         u_int32_t       ai_devid;
  55 };
  56
  57 struct agp_memory_info {
  58         vm_size_t       ami_size;       /* size in bytes */
  59         vm_offset_t     ami_physical;   /* bogus hack for i810 */
  60         vm_offset_t     ami_offset;     /* page offset if bound */
  61         int             ami_is_bound;   /* non-zero if bound */
  62 };
  63
  64 /*
  65  * Find the AGP device and return it.
  66  */
  67 device_t agp_find_device(void);
  68
  69 /*
  70  * Return the current owner of the AGP chipset.
  71  */
  72 enum agp_acquire_state agp_state(device_t dev);
  73
  74 /*
  75  * Query the state of the AGP system.
  76  */
  77 void agp_get_info(device_t dev, struct agp_info *info);
  78
  79 /*
  80  * Acquire the AGP chipset for use by the kernel. Returns EBUSY if the
  81  * AGP chipset is already acquired by another user.
  82  */
  83 int agp_acquire(device_t dev);
  84
  85 /*
  86  * Release the AGP chipset.
  87  */
  88 int agp_release(device_t dev);
  89
  90 /*
  91  * Enable the agp hardware with the relavent mode. The mode bits are
  92  * defined in <pci/agpreg.h>
  93  */
  94 int agp_enable(device_t dev, u_int32_t mode);
  95
  96 /*
  97  * Allocate physical memory suitable for mapping into the AGP
  98  * aperture.  The value returned is an opaque handle which can be
  99  * passed to agp_bind(), agp_unbind() or agp_deallocate().
 100  */
 101 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes);
 102
 103 /*
 104  * Free memory which was allocated with agp_allocate().
 105  */
 106 void agp_free_memory(device_t dev, void *handle);
 107
 108 /*
 109  * Bind memory allocated with agp_allocate() at a given offset within
 110  * the AGP aperture. Returns EINVAL if the memory is already bound or
 111  * the offset is not at an AGP page boundary.
 112  */
 113 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset);
 114
 115 /*
 116  * Unbind memory from the AGP aperture. Returns EINVAL if the memory
 117  * is not bound.
 118  */
 119 int agp_unbind_memory(device_t dev, void *handle);
 120
 121 /*
 122  * Retrieve information about a memory block allocated with
 123  * agp_alloc_memory().
 124  */
 125 void agp_memory_info(device_t dev, void *handle, struct agp_memory_info *mi);
 126
 127 #endif /* !_PCI_AGPVAR_H_ */