FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp_if.m
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/12.0/sys/dev/agp/agp_if.m 235782 2012-05-22 10:59:26Z kib $
27 #
28
29 #include <sys/bus.h>
30
31 #
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>
36 #
37 INTERFACE agp;
38
39 CODE {
40 static int
41 null_agp_chipset_flush(device_t dev)
42 {
43 return (ENXIO);
44 }
45 };
46
47 #
48 # Return the current aperture size.
49 #
50 METHOD u_int32_t get_aperture {
51 device_t dev;
52 };
53
54 #
55 # Set the size of the aperture. Return EINVAL on error or 0 on success.
56 #
57 METHOD int set_aperture {
58 device_t dev;
59 u_int32_t aperture;
60 };
61
62 #
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.
66 #
67 METHOD int bind_page {
68 device_t dev;
69 vm_offset_t offset;
70 vm_offset_t physical;
71 };
72
73 #
74 # Unbind a single page in the AGP aperture.
75 #
76 METHOD int unbind_page {
77 device_t dev;
78 vm_offset_t offset;
79 };
80
81 #
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.
84 #
85 METHOD void flush_tlb {
86 device_t dev;
87 };
88
89 #
90 # Enable the agp hardware with the relavent mode. The mode bits are
91 # defined in <dev/agp/agpreg.h>
92 #
93 METHOD int enable {
94 device_t dev;
95 u_int32_t mode;
96 };
97
98 #
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
104 # and unbind_memory.
105 #
106 # The size is specified in bytes but must be a multiple of the AGP
107 # page size.
108 #
109 METHOD struct agp_memory * alloc_memory {
110 device_t dev;
111 int type;
112 vm_size_t size;
113 };
114
115 #
116 # Free a memory region previously allocated with alloc_memory. Return
117 # EBUSY if the memory is bound.
118 #
119 METHOD int free_memory {
120 device_t dev;
121 struct agp_memory *mem;
122 };
123
124 #
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
128 # the memory region.
129 #
130 METHOD int bind_memory {
131 device_t dev;
132 struct agp_memory *mem;
133 vm_offset_t offset;
134 };
135
136 #
137 # Unbind a memory region bound with bind_memory.
138 #
139 METHOD int unbind_memory {
140 device_t dev;
141 struct agp_memory *handle;
142 };
143
144 METHOD int chipset_flush {
145 device_t dev;
146 } DEFAULT null_agp_chipset_flush;
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