kernel/kernel.c

#include "multiboot.h"
#include "vga.h"

// static inline void outb(unsigned int port, unsigned char val) {
//   asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
// }

void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {

    // Cursor disabling
    // TODO: outb function
    //outb(0x3D4, 0x0A);
    //outb(0x3D5, 0x20);

    //cls();
    vga_init(VGA_COLOR_GREY, VGA_COLOR_BLACK);

    vga_write_line("=== KoalemOS ===");
    vga_write("Checking multiboot loader: ");

    // Check multiboot header
    if (mbootmagick != MULTIBOOT_BOOTLOADER_MAGIC) {
        vga_write_color("INVALID MAGIC", VGA_COLOR_BLACK, VGA_COLOR_RED);
        return;
    }
    vga_write(mbootinfo->boot_loader_name);

    // Check videomode
    vga_write("\nVideomode: ");
    switch (mbootinfo->vbe_mode) {
        case MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED:
            vga_write("Indexed");
            break;
        case MULTIBOOT_FRAMEBUFFER_TYPE_RGB:
            vga_write("RGB");
            break;
        case MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT:
            vga_write("EGA TEXT");
            break;
        default:
            vga_write_color("UNKNOWN", VGA_COLOR_BLACK, VGA_COLOR_RED);
            return;
    }

    vga_write_line("\nExecution finished, halting...");
}