CeDOS - kernel/main.c

kernel/main.c (view raw)

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
#include "cedos/drivers/console.h"
#include "cedos/interrupts.h"
#include "cedos/pic.h"
#include "cedos/pit.h"
#include "cedos/sched.h"
#include "cedos/mm/paging.h"
#include "cedos/core.h"
#include "assert.h"

int os_init(void) {
    core_init();
    printk("Core functions initialized.\n");

    printk("Initializing PIC...");
    pic_init();
    printk("done.\n");

    printk("Initializing PIT...");
    pit_init();
    printk("done.\n");
    
    printk("Initializing interrupts...");
    interrupts_init();
    printk("done.\n");

    printk("Setting up paging...");
    paging_init();
    printk("done.\n");

    printk("Activating interrupts...");
    sti();
    printk("done.\n");

    printk("Initializing scheduler...");
    sched_init();
    printk("done.\n");

    printk("Initialization finished.\n--------------\n");

    return 1;
}

void infodump(void) {
    uint32_t res[4];
    cpuid(0, &res[0], &res[2], &res[1]);
    res[3] = 0;
    printk("CPU manufacturer: %s\n", res);
}

extern uint8_t* IDT;

void task1(void) {
    //outb(0xFE, 0x64);
    printk("Somebody once told me\n");
}

void task2(void) {
    printk("The world is gonna roll me\n");
}

void task3(void) {
    printk("I ain't the sharpest tool in the shed.\n");
    cli();
    while (1);
}

int os_main(void) {
    //pic_unmask_interrupt(0);
    infodump();

    // create test tasks
    printk("Creating tasks.\n");
    sched_exec(create_empty_page_dir(), task1, get_eflags());
    sched_exec(create_empty_page_dir(), task2, get_eflags());
    sched_exec(create_empty_page_dir(), task3, get_eflags());

    printk("Starting scheduler.\n");
    sched_start();

    //kpanic("SIMULATED KERNEL PANIC");

    // won't be executed
    //printk("Main procedure terminating.\n");
    return 0;
}