libkernaux/examples/kernel-grub-multiboot2/main.c

#include <stdarg.h>
#include <stdint.h>

#include <kernaux/asm/i386.h>
#include <kernaux/drivers/console.h>
#include <kernaux/multiboot2.h>
#include <kernaux/printf.h>

void halt();

static void panic(const char *str);
static void printf(const char *format, ...);

void main(
    const uint32_t multiboot2_magic,
    const struct KernAux_Multiboot2 *const multiboot2_info
) {
    if (multiboot2_magic != KERNAUX_MULTIBOOT2_MAGIC) {
        panic("Multiboot 2 magic number is invalid");
    }

    if (!KernAux_Multiboot2_is_valid(multiboot2_info)) {
        panic("Multiboot 2 info is invalid");
    }

    KernAux_Multiboot2_print(multiboot2_info, printf);
}

void halt()
{
    panic("Kernel main function returned");
}

void panic(const char *const str)
{
    printf("panic: %s\n", str);
    kernaux_asm_i386_hang();
}

void printf(const char *const format, ...)
{
    va_list va;

    va_start(va, format);
    kernaux_printf_va(kernaux_console_putc, format, va);
    va_end(va);
}