2 # Copyright (c) 2000 Doug Rabson
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
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.
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
32 # The AGP interface is used internally to the agp driver to isolate the
33 # differences between various AGP chipsets into chipset mini drivers. It
34 # should not be used outside the AGP driver. The kernel api for accessing
35 # AGP functionality is described in <dev/agp/agpvar.h>
41 null_agp_chipset_flush(device_t dev)
48 # Return the current aperture size.
50 METHOD u_int32_t get_aperture {
55 # Set the size of the aperture. Return EINVAL on error or 0 on success.
57 METHOD int set_aperture {
63 # Bind a single page in the AGP aperture to a given physical address.
64 # The offset is a byte offset within the aperture which must be
65 # aligned to an AGP page boundary.
67 METHOD int bind_page {
74 # Unbind a single page in the AGP aperture.
76 METHOD int unbind_page {
82 # Flush the GATT TLB. This is used after a call to bind_page to
83 # ensure that any mappings cached in the chipset are discarded.
85 METHOD void flush_tlb {
90 # Enable the agp hardware with the relavent mode. The mode bits are
91 # defined in <dev/agp/agpreg.h>
99 # Allocate memory of a given type. The type is a chipset-specific
100 # code which is used by certain integrated agp graphics chips
101 # (basically just the i810 for now) to access special features of
102 # the chipset. An opaque handle representing the memory region is
103 # returned and can be used as an argument to free_memory, bind_memory
106 # The size is specified in bytes but must be a multiple of the AGP
109 METHOD struct agp_memory * alloc_memory {
116 # Free a memory region previously allocated with alloc_memory. Return
117 # EBUSY if the memory is bound.
119 METHOD int free_memory {
121 struct agp_memory *mem;
125 # Bind a memory region to a specific byte offset within the chipset's
126 # AGP aperture. This effectively defines a range of contiguous
127 # physical address which alias the (possibly uncontiguous) pages in
130 METHOD int bind_memory {
132 struct agp_memory *mem;
137 # Unbind a memory region bound with bind_memory.
139 METHOD int unbind_memory {
141 struct agp_memory *handle;
144 METHOD int chipset_flush {
146 } DEFAULT null_agp_chipset_flush;