Architecture Overview

_Noreturn void kmain(stivale2_struct* info)
{
    // convert the physical address to a virtual one, since we will be removing identity mapping later
    bootinfo = (stivale2_struct*)PHYS_TO_VIRT(info);

    // some info
    klog_printf("Aeolos x86_64 (alpha)\n");
    klog_printf("Built on "__DATE__" at "__TIME__".\n\n");

    idt_init();
    cpu_features_init();

    // system initialization
    pmm_init((stv2_struct_tag_mmap*)stv2_find_struct_tag(bootinfo, STV2_STRUCT_TAG_MMAP_ID));
    vmm_init();
    gdt_init();

    // initialize framebuffer and terminal
    fb_init((stv2_struct_tag_fb*)stv2_find_struct_tag(bootinfo, STV2_STRUCT_TAG_FB_ID));
    serial_init();
    term_init();

    // further system initialization
    acpi_init((stv2_struct_tag_rsdp*)stv2_find_struct_tag(bootinfo, STV2_STRUCT_TAG_RSDP_ID));
    hpet_init();
    apic_init();
    vfs_init();
    smp_init();

    // since we do not need the bootloader info anymore
    pmm_reclaim_bootloader_mem();

    // initialize multitasking
    sched_init(kinit);

    // DO NOT put anything here. Put it in kinit() instead

    while (true)
        ;
}

void kinit(tid_t tid)
{
    (void)tid;
    klog_show();
    klog_ok("first kernel task started\n");

    initrd_init((stv2_struct_tag_modules*)stv2_find_struct_tag(bootinfo, STV2_STRUCT_TAG_MODULES_ID));

    // Test VFS functionality
    klog_printf("\n");
    char buff[4096] = { 0 };
    vfs_handle_t fh = vfs_open("/docs/test.txt", VFS_MODE_READ);
    klog_info("reading \"/docs/test.txt\":\n\n");
    int64_t nb = vfs_read(fh, 4096, buff);
    klog_printf("%s\n", buff, nb);
    klog_info("bytes read: %d\n", nb);
    vfs_close(fh);

    vfs_debug();
    pmm_dumpstats();

    klog_warn("This OS is a work in progress. The computer will now halt.");
    sched_kill(tid);
}