Luna/kernel/src/main.cpp

#include "Log.h"
#include "arch/CPU.h"
#include "arch/MMU.h"
#include "arch/Serial.h"
#include "arch/Timer.h"
#include "boot/Init.h"
#include "memory/Heap.h"
#include "memory/MemoryManager.h"
#include "video/TextConsole.h"
#include <Units.h>

Result<void> init()
{
    Serial::println("Hello, world!");

    Serial::printf("Current platform: %s\n", CPU::platform_string());

    Serial::println(TRY(CPU::identify()));

    const u64 address = 0xfffffffff8000000;

    Serial::printf("Mapping address 0x%lx\n", address);

    TRY(MemoryManager::alloc_at(address, 1, MMU::ReadWrite));

    TRY(MMU::remap(address, MMU::ReadWrite | MMU::User));

    int flags = TRY(MMU::get_flags(address));

    if (flags & MMU::ReadWrite) Serial::println("Mapping is now writable");
    if (flags & MMU::User) Serial::println("Mapping is now user accessible");

    u64 old = TRY(MMU::unmap(address));

    Serial::printf("Unmapped page, was pointing to %#lx\n", old);

    TextConsole::set_foreground(0xff000055);
    TextConsole::set_background(0xff88ff00);

    TextConsole::printf("Hello from Moon for the %s architecture!\n", CPU::platform_string());

    Timer::init();

    kinfoln("Hello, world!");
    kwarnln("THIS IS A WARNING");
    kerrorln("ERROR: Please do something.");

    CPU::platform_finish_init();

    CPU::enable_interrupts();

    usize start = 0;

    int* mem = TRY(make<int>());
    *(volatile int*)mem = 6;
    Serial::printf("Read %d from memory\n", *mem);

    TRY(destroy(mem));

    char buffer[64];
    to_dynamic_unit(MemoryManager::free(), buffer, sizeof(buffer));
    kinfoln("Free memory: %s", buffer);
    to_dynamic_unit(MemoryManager::used(), buffer, sizeof(buffer));
    kinfoln("Used memory: %s", buffer);
    to_dynamic_unit(MemoryManager::reserved(), buffer, sizeof(buffer));
    kinfoln("Reserved memory: %s", buffer);

    while (1)
    {
        while ((Timer::ticks_ms() - start) < 100) { CPU::wait_for_interrupt(); }
        start = Timer::ticks_ms();
        kdbgln("%8zu milliseconds have passed!", start);
    }

    return {};
}

extern "C" [[noreturn]] void _start()
{
    Init::check_magic();
    Init::early_init();
    auto rc = init();
    rc.release_value();
    CPU::efficient_halt();
}