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 * $FreeBSD$ 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_size_t ai_memory_allowed; 51 vm_size_t ai_memory_used; 52 u_int32_t ai_devid; 53 }; 54 55 struct agp_memory_info { 56 vm_size_t ami_size; /* size in bytes */ 57 vm_offset_t ami_physical; /* bogus hack for i810 */ 58 vm_offset_t ami_offset; /* page offset if bound */ 59 int ami_is_bound; /* non-zero if bound */ 60 }; 61 62 /* 63 * Find the AGP device and return it. 64 */ 65 device_t agp_find_device(void); 66 67 /* 68 * Return the current owner of the AGP chipset. 69 */ 70 enum agp_acquire_state agp_state(device_t dev); 71 72 /* 73 * Query the state of the AGP system. 74 */ 75 void agp_get_info(device_t dev, struct agp_info *info); 76 77 /* 78 * Acquire the AGP chipset for use by the kernel. Returns EBUSY if the 79 * AGP chipset is already acquired by another user. 80 */ 81 int agp_acquire(device_t dev); 82 83 /* 84 * Release the AGP chipset. 85 */ 86 int agp_release(device_t dev); 87 88 /* 89 * Enable the agp hardware with the relavent mode. The mode bits are 90 * defined in <pci/agpreg.h> 91 */ 92 int agp_enable(device_t dev, u_int32_t mode); 93 94 /* 95 * Allocate physical memory suitable for mapping into the AGP 96 * aperture. The value returned is an opaque handle which can be 97 * passed to agp_bind(), agp_unbind() or agp_deallocate(). 98 */ 99 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes); 100 101 /* 102 * Free memory which was allocated with agp_allocate(). 103 */ 104 void agp_free_memory(device_t dev, void *handle); 105 106 /* 107 * Bind memory allocated with agp_allocate() at a given offset within 108 * the AGP aperture. Returns EINVAL if the memory is already bound or 109 * the offset is not at an AGP page boundary. 110 */ 111 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset); 112 113 /* 114 * Unbind memory from the AGP aperture. Returns EINVAL if the memory 115 * is not bound. 116 */ 117 int agp_unbind_memory(device_t dev, void *handle); 118 119 /* 120 * Retrieve information about a memory block allocated with 121 * agp_alloc_memory(). 122 */ 123 void agp_memory_info(device_t dev, void *handle, struct agp_memory_info *mi); 124 125 #endif /* !_PCI_AGPVAR_H_ */ 126