MyOS/kernel.cpp at master · Iaven00/MyOS · GitHub

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

#include "gdt.h"
#include "types.h"
#include "interrupts.h"
#include "keyboard.h"
// #define GRAPHICSMODE


void printf(char* str)
{
    static uint16_t* VideoMemory = (uint16_t*)0xb8000;
    static uint8_t x=0,y=0;
    for(int i = 0; str[i] != '\0'; ++i)
    {
        switch(str[i])
        {
            case '\n':
                x = 0;
                y++;
                break;
            default:
                VideoMemory[80*y+x] = (VideoMemory[80*y+x] & 0xFF00) | str[i];
                x++;
                break;
        }

        if(x >= 80)
        {
            x = 0;
            y++;
        }

        if(y >= 25)
        {
            for(y = 0; y < 25; y++)
                for(x = 0; x < 80; x++)
                    VideoMemory[80*y+x] = (VideoMemory[80*y+x] & 0xFF00) | ' ';
            x = 0;
            y = 0;
        }
    }
}


// 这里不加extern的话，start_ctors and end_ctors 无法被静态对象和全局对象使用
typedef void (*constructor) ();
extern "C" constructor start_ctors;
extern "C" constructor end_ctors;

extern "C" void callConstructors()
{
    for(constructor* i = &start_ctors; i != &end_ctors; i++)
        (*i)();
}

extern "C" void kernelMain(const void* multiboot_structure, uint32_t /*multiboot_magic*/)
{

    printf("Hello MyOS\n");
    GlobalDescriptorTable gdt;

    InterruptManager interrupts(&gdt);

    KeyboardDriver keyboard(&interrupts);

    interrupts.Activate();


    while(1);

}