1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
#ifndef MELVIX_VESA_H
#define MELVIX_VESA_H
#include <stdint.h>
typedef struct __attribute__ ((packed)) {
char signature[4]; // must be "VESA" to indicate valid VBE support
uint32_t version; // VBE version; high byte is major version, low byte is minor version
uint32_t oem; // segment:offset pointer to OEM
uint32_t capabilities; // bitfield that describes card capabilities
uint32_t video_modes; // segment:offset pointer to list of supported video modes
uint32_t video_memory; // amount of video memory in 64KB blocks
uint32_t software_rev; // software revision
uint32_t vendor; // segment:offset to card vendor string
uint32_t product_name; // segment:offset to card model name
uint32_t product_rev; // segment:offset pointer to product revision
char reserved[222]; // reserved for future expansion
char oem_data[256]; // OEM BIOSes store their strings in this area
} vbe_info;
typedef struct __attribute__ ((packed)) {
uint16_t attributes; // deprecated, only bit 7 should be of interest to you, and it indicates the mode supports a linear frame buffer.
uint8_t window_a; // deprecated
uint8_t window_b; // deprecated
uint16_t granularity; // deprecated; used while calculating bank numbers
uint16_t window_size;
uint16_t segment_a;
uint16_t segment_b;
uint32_t win_func_ptr; // deprecated; used to switch banks from protected mode without returning to real mode
uint16_t pitch; // number of bytes per horizontal line
uint16_t width; // width in pixels
uint16_t height; // height in pixels
uint8_t w_char; // unused...
uint8_t y_char; // ...
uint8_t planes;
uint8_t bpp; // bits per pixel in this mode
uint8_t banks; // deprecated; total number of banks in this mode
uint8_t memory_model;
uint8_t bank_size; // deprecated; size of a bank, almost always 64 KB but may be 16 KB...
uint8_t image_pages;
uint8_t reserved0;
uint8_t red_mask;
uint8_t red_position;
uint8_t green_mask;
uint8_t green_position;
uint8_t blue_mask;
uint8_t blue_position;
uint8_t reserved_mask;
uint8_t reserved_position;
uint8_t direct_color_attributes;
uint32_t framebuffer; // physical address of the linear frame buffer; write here to draw to the screen
uint32_t off_screen_mem_off;
uint16_t off_screen_mem_size; // size of memory in the framebuffer but not being displayed on the screen
uint8_t reserved1[206];
} vbe_mode_info;
vbe_mode_info *vbe_set_mode(unsigned short mode);
void set_optimal_resolution();
typedef struct __attribute__ ((packed)) {
unsigned short di, si, bp, sp, bx, dx, cx, ax;
unsigned short gs, fs, es, ds, eflags;
} regs16_t;
extern void int32(unsigned char intnum, regs16_t *regs);
int vbe_current_mode;
int vbe_width;
int vbe_height;
int vbe_bpp;
int vbe_pitch;
#endif
|
