// File: kernel.c
// SoraOS Kernel - Main entry point

// Simple helper to write a character at a specific position
static inline void write_char(int row, int col, char c, unsigned char color) {
    volatile unsigned short *vga = (volatile unsigned short *)0xB8000;
    int pos = (row * 80) + col;
    vga[pos] = (color << 8) | c;
}

// Simple helper to write a string
static void write_string(int row, int col, const char *str, unsigned char color) {
    int i = 0;
    while (str[i] != '\0') {
        write_char(row, col + i, str[i], color);
        i++;
    }
}

// Clear the entire screen
static void clear_screen(void) {
    volatile unsigned short *vga = (volatile unsigned short *)0xB8000;
    int i;
    for (i = 0; i < 80 * 25; i++) {
        vga[i] = (0x00 << 8) | ' ';
    }
}

void kmain(void) {
    // Clear screen
    clear_screen();
    
    // Write messages
    write_string(10, 30, "SORA OS KERNEL", 0x0A);      // Green
    write_string(12, 25, "64-bit kernel running!", 0x0F); // White
    write_string(14, 28, "System Initialized", 0x0E);   // Yellow 
    
    // Infinite loop
    while (1) {
        __asm__ volatile ("hlt");
    }
}