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 <syslinux/firmware.h>
32#include <inttypes.h>
33#include <com32.h>
34
35/* VESA General Information table */
36struct vesa_general_info {
37    uint32_t signature;		/* Magic number = "VESA" */
38    uint16_t version;
39    far_ptr_t vendor_string;
40    uint8_t capabilities[4];
41    far_ptr_t video_mode_ptr;
42    uint16_t total_memory;
43
44    uint16_t oem_software_rev;
45    far_ptr_t oem_vendor_name_ptr;
46    far_ptr_t oem_product_name_ptr;
47    far_ptr_t oem_product_rev_ptr;
48
49    uint8_t reserved[222];
50    uint8_t oem_data[256];
51} __attribute__ ((packed));
52
53#define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) + ('A' << 24))
54#define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) + ('2' << 24))
55
56struct vesa_mode_info {
57    uint16_t mode_attr;
58    uint8_t win_attr[2];
59    uint16_t win_grain;
60    uint16_t win_size;
61    uint16_t win_seg[2];
62    far_ptr_t win_scheme;
63    uint16_t logical_scan;
64
65    uint16_t h_res;
66    uint16_t v_res;
67    uint8_t char_width;
68    uint8_t char_height;
69    uint8_t memory_planes;
70    uint8_t bpp;
71    uint8_t banks;
72    uint8_t memory_layout;
73    uint8_t bank_size;
74    uint8_t image_pages;
75    uint8_t page_function;
76
77    uint8_t rmask;
78    uint8_t rpos;
79    uint8_t gmask;
80    uint8_t gpos;
81    uint8_t bmask;
82    uint8_t bpos;
83    uint8_t resv_mask;
84    uint8_t resv_pos;
85    uint8_t dcm_info;
86
87    uint8_t *lfb_ptr;		/* Linear frame buffer address */
88    uint8_t *offscreen_ptr;	/* Offscreen memory address */
89    uint16_t offscreen_size;
90
91    uint8_t reserved[206];
92} __attribute__ ((packed));
93
94struct vesa_info {
95    struct vesa_general_info gi;
96    struct vesa_mode_info mi;
97};
98
99extern struct vesa_info __vesa_info;
100
101#if 0
102static inline void vesa_debug(uint32_t color, int pos)
103{
104    uint32_t *stp = (uint32_t *) __vesa_info.mi.lfb_ptr;
105    stp[pos * 3] = color;
106}
107#else
108static inline void vesa_debug(uint32_t color, int pos)
109{
110    (void)color;
111    (void)pos;
112}
113#endif
114
115#endif /* LIB_SYS_VESA_H */
116