kernel.c

/* 
 * OS-Studio Kernel Template
 * Tiwut's Masterpiece
 */

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

/* Hardware text mode color constants. */
enum vga_color {
	VGA_COLOR_BLACK = 0,
	VGA_COLOR_BLUE = 1,
	VGA_COLOR_GREEN = 2,
	VGA_COLOR_CYAN = 3,
	VGA_COLOR_RED = 4,
	VGA_COLOR_MAGENTA = 5,
	VGA_COLOR_BROWN = 6,
	VGA_COLOR_LIGHT_GREY = 7,
};

static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) {
	return fg | bg << 4;
}

static inline uint16_t vga_entry(unsigned char uc, uint8_t color) {
	return (uint16_t) uc | (uint16_t) color << 8;
}

void kernel_main(void) {
	/* Initialize terminal interface */
	uint16_t* terminal_buffer = (uint16_t*) 0xB8000;
    
    const char* str = "Welcome to OS-Studio!";
    for (size_t i = 0; str[i] != '\0'; i++) {
        terminal_buffer[i] = vga_entry(str[i], vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
    }
}