os/kernel/kernel.c

#include <kernel/tty.h>
#include <kernel/idt.h>
#include <kernel/elf.h>
#include <kernel/pic.h>
#include <kernel/heap.h>
#include <kernel/task.h>
#include <kernel/paging.h>

#include <debugging.h>

/* Check if the compiler thinks you are targeting the wrong operating system. */
#if defined(__linux__)
#error "You are not using a cross-compiler, you will most certainly run into trouble"
#endif

uint8_t program[] = {
    0xcd, 0x80, // int $0x80
    0xff, 0xe1, // jmp *%ecx
};

uint8_t data[] = "Hello From Userspace\n";

uint8_t kernel_data[] = "Hello From Kernelspace\n";
// uint8_t data[] = {};

void kernel_main(void) 
{
    /* Initialize terminal interface */
    terminal_initialize();
    terminal_writestring("Hello from Kernelspace\n");

    idt_init();
    init_pic();
    heap_init();

    setup_tasks();
    setup_paging();

    terminal_writestring("Woaw\n");

    struct Heap_Block* block;
    void* code_page = alloc_page(1, &block);
    void* data_page = alloc_page(1, &block);

    set_page_table_entry(0, code_page);
    set_page_table_entry(0x00400000, data_page);

    *(int*)0 = 1;

    while (true) { }

    /* asm("cli");

    run_program(program, sizeof(program), data, sizeof(data));

    asm("sti");
    asm("int $0x20");

    int i = 0;
    while (true) {
        i += 1;
        if (i == 1 << 16) {
            asm("mov %0, %%eax" :: "r" (kernel_data) );
            asm("mov $0, %ecx");
            asm("int $0x80");
            i = 0;
        }
    } */
}