src/kernel/kernel.c


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

#include <kernel/graphics/vesa.h>
#include <kernel/gdt/gdt.h>
#include <kernel/interrupts/interrupts.h>
#include <kernel/io/io.h>
#include <kernel/timer/timer.h>
#include <kernel/paging/paging.h>
#include <kernel/input/input.h>
#include <kernel/acpi/acpi.h>
#include <kernel/smbios/smbios.h>
#include <kernel/lib/lib.h>
#include <kernel/syscall/syscall.h>
#include <kernel/fs/marfs/marfs.h>
#include <kernel/fs/iso9660/iso9660.h>
#include <kernel/fs/atapi_pio.h>
#include <kernel/lib/stdlib/liballoc.h>
#include <kernel/pci/pci.h>
#include <kernel/net/network.h>

extern void jump_userspace();

void kernel_main()
{
    vga_log("Installing basic features of Melvix...", 0);

    // Install features
    memory_init();
    gdt_install();
    init_serial();
    acpi_install();
    paging_install();
    idt_install();
    isrs_install();
    irq_install();
    font_install();
    set_optimal_resolution();

    // Install drivers
    asm ("cli");
    timer_install();
    mouse_install();
    keyboard_install();
    pci_remap();
    network_install();
    asm ("sti");

    // Get hardware information
    get_smbios();

    // Print total memory
    info("Total memory found: %dMiB", (memory_get_all() >> 10) + 1);

    uint8_t boot_drive_id = (uint8_t) (*((uint8_t *) 0x9000));
    // if (boot_drive_id == 0xE0) {
    // install_melvix();

    info("Switching to user mode...");
    syscalls_install();
    tss_flush();
    uint32_t userspace = paging_alloc_pages(10);
    paging_set_user(userspace, 10);
    if (boot_drive_id == 0xE0) {
        char *user_p[] = {"USER.BIN"};
        struct iso9660_entity *user_e = ISO9660_get(user_p, 1);
        if (!user_e) panic("Userspace binary not found!");
        ATAPI_granular_read(1 + (user_e->length / 2048), user_e->lba, (uint8_t *) (userspace + 4096));
        kfree(user_e);
        jump_userspace(userspace + 4096);
    } else {
        marfs_read_whole_file(4, (uint8_t *) (userspace + 4096));
        jump_userspace(userspace + 4096);
    }

    panic("This should NOT happen!");

    // asm ("div %0" :: "r"(0)); // Exception testing x/0
}