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1.1 root 1: /*
2: * fbif.h -- Xen virtual frame buffer device
3: *
4: * Permission is hereby granted, free of charge, to any person obtaining a copy
5: * of this software and associated documentation files (the "Software"), to
6: * deal in the Software without restriction, including without limitation the
7: * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8: * sell copies of the Software, and to permit persons to whom the Software is
9: * furnished to do so, subject to the following conditions:
10: *
11: * The above copyright notice and this permission notice shall be included in
12: * all copies or substantial portions of the Software.
13: *
14: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17: * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20: * DEALINGS IN THE SOFTWARE.
21: *
22: * Copyright (C) 2005 Anthony Liguori <[email protected]>
23: * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <[email protected]>
24: */
25:
26: #ifndef __XEN_PUBLIC_IO_FBIF_H__
27: #define __XEN_PUBLIC_IO_FBIF_H__
28:
29: /* Out events (frontend -> backend) */
30:
31: /*
32: * Out events may be sent only when requested by backend, and receipt
33: * of an unknown out event is an error.
34: */
35:
36: /* Event type 1 currently not used */
37: /*
38: * Framebuffer update notification event
39: * Capable frontend sets feature-update in xenstore.
40: * Backend requests it by setting request-update in xenstore.
41: */
42: #define XENFB_TYPE_UPDATE 2
43:
44: struct xenfb_update
45: {
46: uint8_t type; /* XENFB_TYPE_UPDATE */
47: int32_t x; /* source x */
48: int32_t y; /* source y */
49: int32_t width; /* rect width */
50: int32_t height; /* rect height */
51: };
52:
53: /*
54: * Framebuffer resize notification event
55: * Capable backend sets feature-resize in xenstore.
56: */
57: #define XENFB_TYPE_RESIZE 3
58:
59: struct xenfb_resize
60: {
61: uint8_t type; /* XENFB_TYPE_RESIZE */
62: int32_t width; /* width in pixels */
63: int32_t height; /* height in pixels */
64: int32_t stride; /* stride in bytes */
65: int32_t depth; /* depth in bits */
66: int32_t offset; /* offset of the framebuffer in bytes */
67: };
68:
69: #define XENFB_OUT_EVENT_SIZE 40
70:
71: union xenfb_out_event
72: {
73: uint8_t type;
74: struct xenfb_update update;
75: struct xenfb_resize resize;
76: char pad[XENFB_OUT_EVENT_SIZE];
77: };
78:
79: /* In events (backend -> frontend) */
80:
81: /*
82: * Frontends should ignore unknown in events.
83: */
84:
85: /*
86: * Framebuffer refresh period advice
87: * Backend sends it to advise the frontend their preferred period of
88: * refresh. Frontends that keep the framebuffer constantly up-to-date
89: * just ignore it. Frontends that use the advice should immediately
90: * refresh the framebuffer (and send an update notification event if
91: * those have been requested), then use the update frequency to guide
92: * their periodical refreshs.
93: */
94: #define XENFB_TYPE_REFRESH_PERIOD 1
95: #define XENFB_NO_REFRESH 0
96:
97: struct xenfb_refresh_period
98: {
99: uint8_t type; /* XENFB_TYPE_UPDATE_PERIOD */
100: uint32_t period; /* period of refresh, in ms,
101: * XENFB_NO_REFRESH if no refresh is needed */
102: };
103:
104: #define XENFB_IN_EVENT_SIZE 40
105:
106: union xenfb_in_event
107: {
108: uint8_t type;
109: struct xenfb_refresh_period refresh_period;
110: char pad[XENFB_IN_EVENT_SIZE];
111: };
112:
113: /* shared page */
114:
115: #define XENFB_IN_RING_SIZE 1024
116: #define XENFB_IN_RING_LEN (XENFB_IN_RING_SIZE / XENFB_IN_EVENT_SIZE)
117: #define XENFB_IN_RING_OFFS 1024
118: #define XENFB_IN_RING(page) \
119: ((union xenfb_in_event *)((char *)(page) + XENFB_IN_RING_OFFS))
120: #define XENFB_IN_RING_REF(page, idx) \
121: (XENFB_IN_RING((page))[(idx) % XENFB_IN_RING_LEN])
122:
123: #define XENFB_OUT_RING_SIZE 2048
124: #define XENFB_OUT_RING_LEN (XENFB_OUT_RING_SIZE / XENFB_OUT_EVENT_SIZE)
125: #define XENFB_OUT_RING_OFFS (XENFB_IN_RING_OFFS + XENFB_IN_RING_SIZE)
126: #define XENFB_OUT_RING(page) \
127: ((union xenfb_out_event *)((char *)(page) + XENFB_OUT_RING_OFFS))
128: #define XENFB_OUT_RING_REF(page, idx) \
129: (XENFB_OUT_RING((page))[(idx) % XENFB_OUT_RING_LEN])
130:
131: struct xenfb_page
132: {
133: uint32_t in_cons, in_prod;
134: uint32_t out_cons, out_prod;
135:
136: int32_t width; /* the width of the framebuffer (in pixels) */
137: int32_t height; /* the height of the framebuffer (in pixels) */
138: uint32_t line_length; /* the length of a row of pixels (in bytes) */
139: uint32_t mem_length; /* the length of the framebuffer (in bytes) */
140: uint8_t depth; /* the depth of a pixel (in bits) */
141:
142: /*
143: * Framebuffer page directory
144: *
145: * Each directory page holds PAGE_SIZE / sizeof(*pd)
146: * framebuffer pages, and can thus map up to PAGE_SIZE *
147: * PAGE_SIZE / sizeof(*pd) bytes. With PAGE_SIZE == 4096 and
148: * sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2 Megs
149: * 64 bit. 256 directories give enough room for a 512 Meg
150: * framebuffer with a max resolution of 12,800x10,240. Should
151: * be enough for a while with room leftover for expansion.
152: */
153: unsigned long pd[256];
154: };
155:
156: /*
157: * Wart: xenkbd needs to know default resolution. Put it here until a
158: * better solution is found, but don't leak it to the backend.
159: */
160: #ifdef __KERNEL__
161: #define XENFB_WIDTH 800
162: #define XENFB_HEIGHT 600
163: #define XENFB_DEPTH 32
164: #endif
165:
166: #endif
167:
168: /*
169: * Local variables:
170: * mode: C
171: * c-set-style: "BSD"
172: * c-basic-offset: 4
173: * tab-width: 4
174: * indent-tabs-mode: nil
175: * End:
176: */
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