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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#include <lib.h>
#include <comus/asm.h>
#include <comus/memory.h>
#include <comus/drivers/pci.h>
#include <comus/drivers/gpu/bochs.h>
#define INDEX 0x1CE
#define DATA 0x1CF
#define INDEX_ID 0
#define INDEX_XRES 1
#define INDEX_YRES 2
#define INDEX_BPP 3
#define INDEX_ENABLE 4
#define INDEX_BANK 5
#define INDEX_VIRT_WIDTH 6
#define INDEX_VIRT_HEIGHT 7
#define INDEX_X_OFFSET 8
#define INDEX_Y_OFFSET 9
#define DATA_DISP_DISABLE 0x00
#define DATA_DISP_ENABLE 0x01
#define DATA_LFB_ENABLE 0x40
#define DATA_NO_CLEAR_MEM 0x80
#define BOCHS_PCI_VENDOR 0x1234
#define BOCHS_PCI_DEVICE 0x1111
#define BOCHS_WIDTH 1024
#define BOCHS_HEIGHT 768
#define BOCHS_BIT_DEPTH 32
static volatile uint32_t *framebuffer;
static uint16_t width = BOCHS_WIDTH;
static uint16_t height = BOCHS_HEIGHT;
static uint8_t bit_depth = BOCHS_BIT_DEPTH;
static void write(uint16_t index, uint16_t data)
{
outw(INDEX, index);
outw(DATA, data);
}
static uint16_t read(uint16_t value)
{
outw(INDEX, value);
return inw(DATA);
}
static int is_available(void)
{
return (read(INDEX_ID) == 0xB0C5);
}
static void set_mode(uint16_t width, uint16_t height, uint16_t bit_depth,
int lfb, int clear)
{
write(INDEX_ENABLE, DATA_DISP_DISABLE);
write(INDEX_XRES, width);
write(INDEX_YRES, height);
write(INDEX_BPP, bit_depth);
write(INDEX_ENABLE, DATA_DISP_ENABLE | (lfb ? DATA_LFB_ENABLE : 0) |
(clear ? 0 : DATA_NO_CLEAR_MEM));
}
int bochs_init(void)
{
struct pci_device bochs = { 0 };
bool found =
pci_findby_id(&bochs, BOCHS_PCI_DEVICE, BOCHS_PCI_VENDOR, NULL);
if (!found)
return 1;
set_mode(width, height, bit_depth, true, true);
if (!is_available())
return 1;
uint32_t bar0 = pci_rcfg_d(bochs, PCI_BAR0_D);
uint32_t *addr = (uint32_t *)(uintptr_t)bar0;
framebuffer = kmapaddr(addr, NULL, width * height * bit_depth, F_WRITEABLE);
return 0;
}
uint32_t bochs_width(void)
{
return width;
}
uint32_t bochs_height(void)
{
return height;
}
uint8_t bochs_bit_depth(void)
{
return bit_depth;
}
void bochs_set_pixel(uint32_t x, uint32_t y, uint32_t r, uint32_t g, uint32_t b)
{
uint32_t index = x + y * width;
framebuffer[index] = (b << 0) | (g << 8) | (r << 16);
}
|
