1 /* ----------------------------------------------------------------------- *
2  *
3  *   Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
4  *
5  *   Permission is hereby granted, free of charge, to any person
6  *   obtaining a copy of this software and associated documentation
7  *   files (the "Software"), to deal in the Software without
8  *   restriction, including without limitation the rights to use,
9  *   copy, modify, merge, publish, distribute, sublicense, and/or
10  *   sell copies of the Software, and to permit persons to whom
11  *   the Software is furnished to do so, subject to the following
12  *   conditions:
13  *
14  *   The above copyright notice and this permission notice shall
15  *   be included in all copies or substantial portions of the Software.
16  *
17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24  *   OTHER DEALINGS IN THE SOFTWARE.
25  *
26  * ----------------------------------------------------------------------- */
27 
28 #ifndef LIB_SYS_VESA_H
29 #define LIB_SYS_VESA_H
30 
31 #include <inttypes.h>
32 #include <com32.h>
33 
34 /* VESA General Information table */
35 struct vesa_general_info {
36     uint32_t signature;		/* Magic number = "VESA" */
37     uint16_t version;
38     far_ptr_t vendor_string;
39     uint8_t capabilities[4];
40     far_ptr_t video_mode_ptr;
41     uint16_t total_memory;
42 
43     uint16_t oem_software_rev;
44     far_ptr_t oem_vendor_name_ptr;
45     far_ptr_t oem_product_name_ptr;
46     far_ptr_t oem_product_rev_ptr;
47 
48     uint8_t reserved[222];
49     uint8_t oem_data[256];
50 } __attribute__ ((packed));
51 
52 #define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) + ('A' << 24))
53 #define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) + ('2' << 24))
54 
55 struct vesa_mode_info {
56     uint16_t mode_attr;
57     uint8_t win_attr[2];
58     uint16_t win_grain;
59     uint16_t win_size;
60     uint16_t win_seg[2];
61     far_ptr_t win_scheme;
62     uint16_t logical_scan;
63 
64     uint16_t h_res;
65     uint16_t v_res;
66     uint8_t char_width;
67     uint8_t char_height;
68     uint8_t memory_planes;
69     uint8_t bpp;
70     uint8_t banks;
71     uint8_t memory_layout;
72     uint8_t bank_size;
73     uint8_t image_pages;
74     uint8_t page_function;
75 
76     uint8_t rmask;
77     uint8_t rpos;
78     uint8_t gmask;
79     uint8_t gpos;
80     uint8_t bmask;
81     uint8_t bpos;
82     uint8_t resv_mask;
83     uint8_t resv_pos;
84     uint8_t dcm_info;
85 
86     uint8_t *lfb_ptr;		/* Linear frame buffer address */
87     uint8_t *offscreen_ptr;	/* Offscreen memory address */
88     uint16_t offscreen_size;
89 
90     uint8_t reserved[206];
91 } __attribute__ ((packed));
92 
93 struct vesa_info {
94     struct vesa_general_info gi;
95     struct vesa_mode_info mi;
96 };
97 
98 extern struct vesa_info vesa_info;
99 
100 #endif /* LIB_SYS_VESA_H */
101