Add correct sleep which works now because interrupts are re-enabled

using sti in syscalls, remove a bunch of old imports and code, move
keyboard scancode handling to keyboard.rs, add a new KeyboardEvent based
layout where press/release and unicode is handled, add a kbd_read
syscall which writes kbd events to a userspace buffer, add a usercopy
file which provides safe copying functions to userspace

kernel/src/arch/arch.rs

@@ -1,18 +1,13 @@
 #[cfg(target_arch = "x86_64")]
 pub use crate::arch::x86_64::paging::FRAME_ALLOCATOR_X86_64 as FRAME_ALLOCATOR;
 
-use crate::{driver::timer::TIMER, util::serial_print};
-use alloc::string::ToString;
-use core::{alloc::GlobalAlloc, arch::asm, sync::atomic::Ordering};
+use crate::driver::timer::TIMER;
+use core::{alloc::GlobalAlloc, arch::asm};
 use limine::response::{HhdmResponse, MemoryMapResponse};
 
 #[cfg(target_arch = "x86_64")]
 use crate::arch::x86_64::{
-    elf::run_elf_x86_64,
-    heap::ALLOCATOR,
-    init::init_x86_64,
-    paging::{FRAME_ALLOCATOR_X86_64, XunilFrameAllocator},
-    usermode::enter_usermode_x86_64,
+    elf::run_elf_x86_64, heap::ALLOCATOR, init::init_x86_64, usermode::enter_usermode_x86_64,
 };
 #[cfg(target_arch = "x86_64")]
 use x86_64::structures::paging::OffsetPageTable;
@@ -21,7 +16,7 @@ use x86_64::structures::paging::OffsetPageTable;
 pub fn init<'a>(
     hhdm_response: &HhdmResponse,
     memory_map_response: &'a MemoryMapResponse,
-) -> (OffsetPageTable<'static>) {
+) -> OffsetPageTable<'static> {
     return init_x86_64(hhdm_response, memory_map_response);
 }
 
@@ -51,11 +46,10 @@ pub fn idle() {
 }
 
 pub fn sleep(ticks: u64) {
-    // let start = TIMER.now();
-    // while start.ticks_since() < ticks {
-    //     serial_print(start.ticks_since().to_string().as_str());
-    //     core::hint::spin_loop();
-    // }
+    let start = TIMER.now();
+    while start.ticks_since() < ticks {
+        idle();
+    }
 }
 
 pub fn infinite_idle() -> ! {

kernel/src/arch/x86_64/elf.rs

@@ -1,18 +1,10 @@
 use alloc::vec::Vec;
 use x86_64::{
     VirtAddr,
-    structures::paging::{
-        FrameAllocator, Mapper, OffsetPageTable, Page, PageTableFlags, PhysFrame, Size4KiB,
-    },
+    structures::paging::{FrameAllocator, Mapper, Page, PageTableFlags, PhysFrame, Size4KiB},
 };
 
-use crate::{
-    arch::{
-        arch::FRAME_ALLOCATOR,
-        x86_64::{paging::XunilFrameAllocator, usermode::enter_usermode_x86_64},
-    },
-    task::{process::Process, scheduler::SCHEDULER},
-};
+use crate::{arch::arch::FRAME_ALLOCATOR, task::scheduler::SCHEDULER};
 
 pub fn run_elf_x86_64(entry_point: *const u8, heap_base: u64) {
     let stack_base: u64 = 0x0000_7fff_0000_0000;

kernel/src/arch/x86_64/heap.rs

@@ -1,5 +1,5 @@
-use crate::arch::x86_64::paging::{FRAME_ALLOCATOR_X86_64, XunilFrameAllocator};
-use crate::util::{Locked, serial_print};
+use crate::arch::x86_64::paging::FRAME_ALLOCATOR_X86_64;
+use crate::util::Locked;
 use core::{
     alloc::{GlobalAlloc, Layout},
     ptr::null_mut,

kernel/src/arch/x86_64/init.rs

@@ -5,7 +5,6 @@ use crate::{
         mouse::setup_mouse,
     },
     driver::mouse::MOUSE,
-    util::serial_print,
 };
 use limine::response::{HhdmResponse, MemoryMapResponse};
 use x86_64::{
@@ -23,7 +22,7 @@ const PIT_DIVISOR: u16 = (1_193_182_u32 / TIMER_PRECISION_HZ) as u16;
 #[cfg(target_arch = "x86_64")]
 use crate::arch::x86_64::{
     heap::init_heap,
-    paging::{FRAME_ALLOCATOR_X86_64, XunilFrameAllocator, initialize_paging},
+    paging::{FRAME_ALLOCATOR_X86_64, initialize_paging},
 };
 #[cfg(target_arch = "x86_64")]
 use x86_64::{VirtAddr, structures::paging::OffsetPageTable};
@@ -61,6 +60,7 @@ pub fn init_x86_64<'a>(
     load_gdt_x86_64();
 
     unsafe {
+        // setup SSE (SIMD = Single Instruction, Multiple Data)
         let mut cr0 = Cr0::read();
         cr0.remove(Cr0Flags::EMULATE_COPROCESSOR);
         cr0.insert(Cr0Flags::MONITOR_COPROCESSOR);

kernel/src/arch/x86_64/interrupts.rs

@@ -1,15 +1,9 @@
 use crate::{
     arch::x86_64::{gdt, mouse::mouse_interrupt},
-    driver::{
-        keyboard::{KEYBOARD_STATE, KeyboardEvent},
-        mouse::MOUSE,
-        timer::TIMER,
-    },
+    driver::{keyboard::process_keyboard_event, mouse::MOUSE, timer::TIMER},
     println,
-    util::serial_print,
 };
 use lazy_static::lazy_static;
-use pc_keyboard::DecodedKey;
 use pic8259::ChainedPics;
 use spin::Mutex;
 use x86_64::{
@@ -19,8 +13,8 @@ use x86_64::{
     structures::idt::{InterruptDescriptorTable, InterruptStackFrame, PageFaultErrorCode},
 };
 
-pub const PIC_1_OFFSET: u8 = 32;
-pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
+pub const PIC_1_OFFSET: u8 = 32; // master
+pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8; // slave
 
 pub static PICS: Mutex<ChainedPics> =
     Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });
@@ -134,20 +128,8 @@ extern "x86-interrupt" fn mouse_interrupt_handler(_stack_frame: InterruptStackFr
 pub extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStackFrame) {
     let mut port = Port::new(0x60);
     let scancode: u8 = unsafe { port.read() };
-    let mut keyboard_state = KEYBOARD_STATE.lock();
 
-    if let Ok(Some(key_event)) = keyboard_state.keyboard.add_byte(scancode) {
-        if let Some(key) = keyboard_state.keyboard.process_keyevent(key_event) {
-            match key {
-                DecodedKey::Unicode(character) => keyboard_state
-                    .event_queue
-                    .push_back(KeyboardEvent::Unicode(character)),
-                DecodedKey::RawKey(key) => keyboard_state
-                    .event_queue
-                    .push_back(KeyboardEvent::RawKey(key)),
-            }
-        }
-    }
+    process_keyboard_event(scancode);
 
     unsafe {
         PICS.lock()
@@ -175,6 +157,7 @@ unsafe extern "C" fn syscall_interrupt_handler() {
         "push rdi",
         "push rax",
         "sub rsp, 8",
+        "sti",          // allow IRQ interrupts
         "mov rcx, rdx", // arg2
         "mov rdx, rsi", // arg1
         "mov rsi, rdi", // arg0

kernel/src/arch/x86_64/paging.rs

@@ -1,4 +1,3 @@
-use alloc::string::ToString;
 use spin::mutex::Mutex;
 use x86_64::{
     PhysAddr, VirtAddr,
@@ -8,7 +7,7 @@ use x86_64::{
 
 use limine::memory_map::{Entry, EntryType};
 
-use crate::util::{align_up, serial_print};
+use crate::util::align_up;
 
 unsafe fn active_level_4_table(mem_offset: VirtAddr) -> &'static mut PageTable {
     let (level_4_table, _) = Cr3::read();

kernel/src/driver/elf/loader.rs

@@ -1,6 +1,5 @@
 use core::ptr::null;
 
-use alloc::boxed::Box;
 use x86_64::structures::paging::OffsetPageTable;
 
 use crate::driver::{

kernel/src/driver/elf/reloc.rs

@@ -1,5 +1,5 @@
 use crate::driver::elf::{
-    header::{Elf64Ehdr, Elf64Rel, Elf64Rela, Elf64Shdr, R_X86_64_64},
+    header::{Elf64Ehdr, Elf64Rel, Elf64Shdr, R_X86_64_64},
     section::{elf_get_symval, elf_section},
 };
 

kernel/src/driver/graphics/framebuffer.rs

@@ -80,9 +80,9 @@ impl Framebuffer {
         let w = core::cmp::min(src_width, self.width);
 
         for y in 0..h {
-            let src_row = src_ptr.add(y * src_width);
-            let dst_row = self.back_buffer.as_mut_ptr().add(y * self.pitch);
-            core::ptr::copy_nonoverlapping(src_row, dst_row, w);
+            let src_row = unsafe { src_ptr.add(y * src_width) };
+            let dst_row = unsafe { self.back_buffer.as_mut_ptr().add(y * self.pitch) };
+            unsafe { core::ptr::copy_nonoverlapping(src_row, dst_row, w) };
         }
     }
 

kernel/src/driver/keyboard.rs

@@ -1,35 +1,79 @@
-use alloc::collections::VecDeque;
-use lazy_static::lazy_static;
-use pc_keyboard::{HandleControl, Keyboard, ScancodeSet1, layouts};
+use pc_keyboard::{DecodedKey, HandleControl, KeyState, Keyboard, ScancodeSet2, layouts};
 use spin::mutex::Mutex;
+use x86_64::instructions::interrupts::without_interrupts;
 
-#[derive(Debug, Clone)]
-pub enum KeyboardEvent {
-    Unicode(char),
-    RawKey(pc_keyboard::KeyCode),
+use crate::task::scheduler::SCHEDULER;
+
+#[repr(C)]
+#[derive(Clone, Debug, Copy, Default)]
+pub struct KeyboardEvent {
+    pub state: u8,
+    pub _pad1: u8,
+    pub key: u16,
+    pub mods: u16,
+    pub _pad2: u16,
+    pub unicode: u32,
 }
 
-pub struct KeyboardState {
-    pub keyboard: Keyboard<layouts::Us104Key, ScancodeSet1>,
-    pub event_queue: VecDeque<KeyboardEvent>,
-}
-impl KeyboardState {
-    pub fn new() -> KeyboardState {
-        KeyboardState {
-            keyboard: Keyboard::new(
-                ScancodeSet1::new(),
-                layouts::Us104Key,
-                HandleControl::Ignore,
-            ),
-            event_queue: VecDeque::new(),
+pub fn process_keyboard_event(scancode: u8) {
+    let mut keyboard = without_interrupts(|| KEYBOARD.lock());
+
+    let scheduler = without_interrupts(|| SCHEDULER.lock());
+    let pid = scheduler.current_process;
+
+    if pid < 0 {
+        return;
+    }
+
+    drop(scheduler);
+
+    if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
+        let keycode = key_event.code;
+        let keystate = key_event.state;
+        if let Some(key) = keyboard.process_keyevent(key_event) {
+            match key {
+                DecodedKey::Unicode(character) => {
+                    SCHEDULER.with_process(pid as u64, |process| {
+                        process.kbd_buffer.push(KeyboardEvent {
+                            state: if keystate == KeyState::Down { 1 } else { 0 },
+                            _pad1: 0,
+                            key: keycode as u16,
+                            mods: 0,
+                            _pad2: 0,
+                            unicode: character as u32,
+                        })
+                    });
+                }
+                DecodedKey::RawKey(_) => {
+                    SCHEDULER.with_process(pid as u64, |process| {
+                        process.kbd_buffer.push(KeyboardEvent {
+                            state: if keystate == KeyState::Down { 1 } else { 0 },
+                            _pad1: 0,
+                            key: keycode as u16,
+                            mods: 0,
+                            _pad2: 0,
+                            unicode: 0,
+                        })
+                    });
+                }
+            }
+        } else {
+            SCHEDULER.with_process(pid as u64, |process| {
+                process.kbd_buffer.push(KeyboardEvent {
+                    state: if keystate == KeyState::Down { 1 } else { 0 },
+                    _pad1: 0,
+                    key: keycode as u16,
+                    mods: 0,
+                    _pad2: 0,
+                    unicode: 0,
+                })
+            });
         }
     }
 }
 
-lazy_static! {
-    pub static ref KEYBOARD_STATE: Mutex<KeyboardState> = Mutex::new(KeyboardState::new());
-}
-
-pub fn pop_event() -> Option<KeyboardEvent> {
-    KEYBOARD_STATE.lock().event_queue.pop_front()
-}
+pub static KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet2>> = Mutex::new(Keyboard::new(
+    ScancodeSet2::new(),
+    layouts::Us104Key,
+    HandleControl::Ignore,
+));

kernel/src/driver/serial.rs

@@ -16,7 +16,7 @@ pub struct ConsoleWriter<'a> {
 impl Write for ConsoleWriter<'_> {
     fn write_str(&mut self, s: &str) -> fmt::Result {
         serial_print(s);
-        self.console.render_text(self.fb, s, 2, false);
+        // self.console.render_text(self.fb, s, 2, false);
         Ok(())
     }
 }

kernel/src/driver/syscall.rs

@@ -3,9 +3,9 @@ use core::{
     ptr::null_mut,
 };
 
-use alloc::string::ToString;
 use x86_64::{
     VirtAddr,
+    instructions::interrupts::without_interrupts,
     structures::paging::{FrameAllocator, Mapper, Page, PageTableFlags, Size4KiB},
 };
 
@@ -13,11 +13,13 @@ use crate::{
     arch::arch::{FRAME_ALLOCATOR, get_allocator, infinite_idle, sleep},
     driver::{
         graphics::{framebuffer::with_framebuffer, primitives::rectangle_filled},
+        keyboard::KeyboardEvent,
         timer::TIMER,
     },
+    mm::usercopy::copy_to_user,
     print, println,
     task::scheduler::SCHEDULER,
-    util::{align_up, serial_print},
+    util::align_up,
 };
 
 const READ: usize = 0;
@@ -41,10 +43,11 @@ const UNLINK: usize = 87;
 const GETDENTS64: usize = 217;
 const CLOCK_GETTIME: usize = 228;
 const EXIT_GROUP: usize = 231;
+const KBD_READ: usize = 666;
 const SLEEP: usize = 909090; // zzz haha
 const DRAW_PIXEL: usize = 5555;
 const FRAMEBUFFER_SWAP: usize = 6666;
-pub const DRAW_BUFFER: usize = 7777;
+const DRAW_BUFFER: usize = 7777;
 
 pub unsafe fn malloc(size: usize, align: usize) -> *mut u8 {
     let align = if align < 1 {
@@ -81,8 +84,40 @@ pub unsafe fn memset(ptr: *mut u8, val: u8, count: usize) {
     unsafe { core::ptr::write_bytes(ptr, val, count) };
 }
 
+fn kbd_read(user_ptr: *mut KeyboardEvent, max_events: isize) -> isize {
+    if max_events <= 0 || user_ptr.is_null() {
+        return -1;
+    }
+
+    let pid = without_interrupts(|| {
+        let scheduler = SCHEDULER.lock();
+        scheduler.current_process
+    });
+
+    if pid < 0 {
+        return -1;
+    }
+
+    return SCHEDULER
+        .with_process(pid as u64, |process| {
+            let to_copy = (max_events as usize).min(process.kbd_buffer.len());
+            if let Ok(_) = copy_to_user(
+                &mut process.address_space.mapper,
+                user_ptr as *mut u8,
+                process.kbd_buffer.as_ptr() as *const u8,
+                to_copy * size_of::<KeyboardEvent>(),
+            ) {
+                process.kbd_buffer.drain(0..to_copy);
+                return to_copy as isize;
+            } else {
+                return -1;
+            };
+        })
+        .unwrap_or(-1);
+}
+
 pub unsafe fn sbrk(increment: isize) -> isize {
-    let mut scheduler = SCHEDULER.lock();
+    let scheduler = without_interrupts(|| SCHEDULER.lock());
     if scheduler.current_process == -1 {
         return -1;
     }
@@ -91,7 +126,7 @@ pub unsafe fn sbrk(increment: isize) -> isize {
 
     let mut frame_allocator = FRAME_ALLOCATOR.lock();
     return SCHEDULER
-        .with_process(pid as u64, |mut process| {
+        .with_process(pid as u64, |process| {
             let (heap_end, heap_base, stack_top) =
                 (process.heap_end, process.heap_base, process.stack_top);
 
@@ -161,7 +196,7 @@ pub unsafe extern "C" fn syscall_dispatch(
     arg2: isize,
 ) -> isize {
     match num {
-        BRK => sbrk(arg0),
+        BRK => unsafe { sbrk(arg0) },
         WRITE => {
             let buf_ptr = arg1 as *const u8;
             let len = arg2 as usize;
@@ -185,10 +220,6 @@ pub unsafe extern "C" fn syscall_dispatch(
             with_framebuffer(|fb| fb.swap());
             infinite_idle();
         }
-        67 => {
-            println!("{:?}", arg1);
-            0
-        }
         SLEEP => {
             sleep(arg0 as u64);
             0
@@ -201,12 +232,13 @@ pub unsafe extern "C" fn syscall_dispatch(
             0
         }
         DRAW_BUFFER => {
-            with_framebuffer(|mut fb| {
-                fb.load_from_ptr(arg0 as *const u32, arg1 as usize, arg2 as usize);
+            with_framebuffer(|fb| {
+                unsafe { fb.load_from_ptr(arg0 as *const u32, arg1 as usize, arg2 as usize) };
                 fb.swap();
             });
             0
         }
+        KBD_READ => kbd_read(arg0 as *mut KeyboardEvent, arg1),
         FRAMEBUFFER_SWAP => {
             with_framebuffer(|fb| {
                 fb.swap();

kernel/src/driver/timer.rs

@@ -3,8 +3,6 @@ use core::{
     sync::atomic::{AtomicU64, Ordering},
 };
 
-use crate::util::serial_print;
-
 pub static TIMER: Timer = Timer::new();
 
 pub struct Timer {

kernel/src/main.rs

@@ -2,7 +2,6 @@
 #![no_main]
 #![feature(abi_x86_interrupt)]
 #![feature(str_from_raw_parts)]
-#![allow(warnings)]
 extern crate alloc;
 use core::fmt::Write;
 
@@ -24,7 +23,6 @@ use crate::driver::graphics::framebuffer::{init_framebuffer, with_framebuffer};
 use crate::driver::serial::{ConsoleWriter, init_serial_console, with_serial_console};
 use crate::driver::timer::TIMER;
 use crate::userspace_stub::userspace_init;
-use crate::util::serial_print;
 /// Sets the base revision to the latest revision supported by the crate.
 /// See specification for further info.
 /// Be sure to mark all limine requests with #[used], otherwise they may be removed by the compiler.

kernel/src/mm/address_space.rs

@@ -4,10 +4,7 @@ use x86_64::{
     structures::paging::{FrameAllocator, OffsetPageTable, PageTable, PhysFrame, Size4KiB},
 };
 
-use crate::{
-    arch::{arch::FRAME_ALLOCATOR, x86_64::paging::XunilFrameAllocator},
-    driver::syscall::memset,
-};
+use crate::arch::arch::FRAME_ALLOCATOR;
 
 pub struct AddressSpace {
     cr3_frame: PhysFrame<Size4KiB>,
@@ -24,7 +21,7 @@ impl AddressSpace {
             core::ptr::write_bytes(new_pml4_ptr, 0, 512);
         }
 
-        let (cur_pml4, pml4_flags) = Cr3::read();
+        let (cur_pml4, _) = Cr3::read();
 
         unsafe {
             let cur_pml4_ptr =
@@ -38,7 +35,7 @@ impl AddressSpace {
             }
         }
 
-        let mut mapper = unsafe {
+        let mapper = unsafe {
             let addr = frame_allocator.hhdm_offset + new_pml4.start_address().as_u64();
             let virtual_addr = VirtAddr::new(addr);
             let level_4_table: *mut PageTable = virtual_addr.as_mut_ptr();

kernel/src/mm/mod.rs

@@ -1 +1,2 @@
 pub mod address_space;
+pub mod usercopy;

kernel/src/mm/usercopy.rs

@@ -0,0 +1,39 @@
+use x86_64::{
+    VirtAddr,
+    structures::paging::{OffsetPageTable, PageTableFlags, Translate, mapper::TranslateResult},
+};
+
+pub fn copy_to_user(
+    mapper: &mut OffsetPageTable,
+    buf: *mut u8,
+    src: *const u8,
+    len: usize,
+) -> Result<(), isize> {
+    let start = buf as u64;
+    let end = start + len as u64;
+    let mut page_addr = start & !0xFFF;
+
+    while page_addr < end {
+        let translate_result = mapper.translate(VirtAddr::new(page_addr));
+        #[allow(non_shorthand_field_patterns)]
+        if let TranslateResult::Mapped {
+            frame: _,
+            offset: _,
+            flags: flags,
+        } = translate_result
+        {
+            if flags.contains(PageTableFlags::USER_ACCESSIBLE)
+                && flags.contains(PageTableFlags::WRITABLE)
+            {
+            } else {
+                return Err(-13);
+            }
+        } else {
+            return Err(-1);
+        }
+        page_addr += 0x1000;
+    }
+
+    unsafe { core::ptr::copy_nonoverlapping(src, buf, len) };
+    Ok(())
+}

kernel/src/task/process.rs

@@ -1,6 +1,8 @@
-use crate::{arch::x86_64::paging::XunilFrameAllocator, mm::address_space::AddressSpace};
+use alloc::vec::Vec;
 
-enum ProcessState {
+use crate::{driver::keyboard::KeyboardEvent, mm::address_space::AddressSpace};
+
+pub enum ProcessState {
     Ready,
     Running,
     Blocked,
@@ -10,10 +12,10 @@ enum ProcessState {
 pub struct Process {
     pub pid: u64,
     pub state: ProcessState,
-    // cpu_ctx: &[u8],
     pub stack_top: u64,
     pub heap_base: u64,
     pub heap_end: u64,
+    pub kbd_buffer: Vec<KeyboardEvent>,
     pub address_space: AddressSpace,
     pub user_entry: u64,
 }
@@ -33,6 +35,7 @@ impl Process {
             state: ProcessState::Ready,
             heap_base,
             heap_end,
+            kbd_buffer: Vec::new(),
             address_space,
             user_entry,
         })

kernel/src/task/scheduler.rs

@@ -1,11 +1,7 @@
 use alloc::collections::btree_map::BTreeMap;
-use lazy_static::lazy_static;
+use x86_64::instructions::interrupts::without_interrupts;
 
-use crate::{
-    arch::{arch::enter_usermode, x86_64::paging::XunilFrameAllocator},
-    task::process::Process,
-    util::Locked,
-};
+use crate::{arch::arch::enter_usermode, task::process::Process, util::Locked};
 
 pub struct Scheduler {
     pub processes: BTreeMap<u64, Process>,
@@ -25,7 +21,7 @@ impl Scheduler {
 
 impl Locked<Scheduler> {
     pub fn spawn_process(&self, entry_point: u64, stack_top: u64, heap_base: u64) -> Option<u64> {
-        let mut guard = self.lock();
+        let mut guard = without_interrupts(|| self.lock());
         let pid = guard.next_pid;
         guard.next_pid += 1;
         let process = Process::new(pid, entry_point, stack_top, heap_base, heap_base)?;
@@ -35,7 +31,7 @@ impl Locked<Scheduler> {
     }
 
     pub fn run_process(&self, pid: u64, entry_point: *const u8) {
-        let mut guard = self.lock();
+        let mut guard = without_interrupts(|| self.lock());
         let stack_top = guard.processes[&pid].stack_top;
         guard.current_process = pid as i64;
 
@@ -48,7 +44,7 @@ impl Locked<Scheduler> {
     where
         F: FnOnce(&mut Process) -> R,
     {
-        let mut guard = self.lock();
+        let mut guard = without_interrupts(|| self.lock());
         let process = guard.processes.get_mut(&index)?;
         Some(f(process))
     }

kernel/src/userspace_stub.rs

@@ -2,10 +2,7 @@ use alloc::string::ToString;
 use x86_64::structures::paging::OffsetPageTable;
 
 use crate::{
-    arch::{
-        arch::{FRAME_ALLOCATOR, run_elf, sleep},
-        x86_64::paging::XunilFrameAllocator,
-    },
+    arch::arch::{run_elf, sleep},
     driver::{
         elf::loader::load_file,
         graphics::{

user/apps/helloworld/helloworld.c

@@ -1,6 +1,6 @@
-#include "../src/stdio.h"
+#include "../../libxunil/include/stdio.h"
 
-void _start() {
-   write(0, "Hello, World!", 13);
+int main(int argc, char **argv) {
+   printf("%s\n", "Hello, world!");
    exit(0);
 }