kernel.c

#include "screen.h"
#include "util.h"
#include <stdint.h>
#include <stddef.h>

/**
 * @brief The main entry point for the CloverOS kernel (kmain).
 *
 * This function is called by the Assembly boot code after stack setup.
 *
 * @param magic The Multiboot magic number (pushed by GRUB into EAX).
 * @param multiboot_info_addr Address of the Multiboot information structure (pushed by GRUB into EBX).
 */
void kmain(uint32_t magic, uint32_t multiboot_info_addr) {

    // 1. Initial Boot Check
    // GRUB is expected to pass 0x2BADB002 in EAX
    if (magic != 0x2BADB002) {
        kpanic("Multiboot check failed. OS requires a compliant bootloader (GRUB).");
    }

    // Unused variable to avoid Werror 'unused parameter'
    (void)multiboot_info_addr;

    // 2. Render the Modern UI
    render_boot_ui();

    // 3. Example of kpanic using a placeholder error
    // delay(30000000); // Wait a moment

    // 4. Main Kernel Loop / Halt
    // Print final message before halting
    set_color(vga_entry_color(VGA_COLOR_PASTEL_GREEN, VGA_COLOR_BLACK));
    print_at(1, VGA_HEIGHT - 1, "CloverOS has finished booting and is now idle. Halt...");


    // Enter infinite loop (System Halt)
    __asm__ volatile ("cli");
    while (1) {
        __asm__ volatile ("hlt");
    }
}