Implemented task spawning

- Using `pc-keyboard` instead of custom one as it sometimes caused double-faults on keypress

Cargo.lock

@@ -44,6 +44,7 @@ dependencies = [
  "log",
  "logos",
  "pc-beeper",
+ "pc-keyboard",
  "pic8259",
  "picorand",
  "pretty-hex",
@@ -608,6 +609,12 @@ dependencies = [
  "x86_64",
 ]
 
+[[package]]
+name = "pc-keyboard"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c6f2d937e3b8d63449b01401e2bae4041bc9dd1129c2e3e0d239407cf6635ac"
+
 [[package]]
 name = "pic8259"
 version = "0.10.2"

ableos/Cargo.toml

@@ -54,6 +54,7 @@ libwasm = {git="https://git.ablecorp.us:443/able/libwasm.git"}
 axel = { git = "https://git.ablecorp.us/able/aos_userland" }
 versioning = { git = "https://git.ablecorp.us/able/aos_userland" }
 embedded-graphics="*"
+pc-keyboard = "0.5"
 
 
 

ableos/src/arch/x86_64/interrupts.rs

@@ -94,66 +94,40 @@ extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: InterruptStackFr
 }
 
 extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStackFrame) {
-    use crate::keyboard::{
-        CustomLayout, CustomScancodeSet, DecodedKey, DecodedKeyKind, HandleControl, KeyCode,
-        Keyboard,
+    use pc_keyboard::{
+        layouts::Us104Key, DecodedKey, HandleControl, KeyCode, Keyboard, ScancodeSet1,
     };
     use spin::Mutex;
     use x86_64::instructions::port::Port;
 
-    static KEYBOARD: Lazy<Mutex<Keyboard<CustomLayout, CustomScancodeSet>>> = Lazy::new(|| {
-        Mutex::new(Keyboard::new(
-            CustomLayout::new_us104key(),
-            CustomScancodeSet::default(),
-            HandleControl::Ignore,
-        ))
-    });
+    static KEYBOARD: Lazy<Mutex<Keyboard<Us104Key, ScancodeSet1>>> =
+        Lazy::new(|| Mutex::new(Keyboard::new(Us104Key, ScancodeSet1, HandleControl::Ignore)));
 
     let mut keyboard = KEYBOARD.lock();
-    let mut port = Port::new(0x60);
-    let scancode: u8 = unsafe { port.read() };
-    if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
-        if let Some(key) = keyboard.process_keyevent(key_event) {
-            match key {
-                DecodedKey {
-                    kind: DecodedKeyKind::Unicode,
-                    value: character,
-                } => {
-                    match character {
-                        // Backspace
-                        8 => {
-                            WRITER.lock().backspace();
-                            KEYBUFF.lock().push(8_u8 as _);
-                            // print!(" ");
-                            // WRITER.lock().backspace();
-                        }
-
-                        0x5E => KERNEL_STATE.lock().shutdown(),
-
-                        _ => {
-                            let mut buff = KEYBUFF.lock();
-
-                            buff.push(character as u8 as char);
-
-                            print!("{}", char::try_from(character).unwrap());
-                        }
-                    }
+    if let Ok(Some(key)) = keyboard
+        .add_byte(unsafe { Port::new(0x60).read() })
+        .map(|x| x.and_then(|ev| keyboard.process_keyevent(ev)))
+    {
+        match key {
+            DecodedKey::Unicode(chr) => match chr {
+                // Backspace
+                '\u{8}' => {
+                    WRITER.lock().backspace();
+                    KEYBUFF.lock().push(8.into());
                 }
-                DecodedKey {
-                    kind: DecodedKeyKind::RawKey,
-                    value: key,
-                } => match KeyCode::from(key) {
-                    KeyCode::AltLeft => {}
-
-                    KeyCode::AltRight => {}
-                    _ => {
-                        print!("{:?}", KeyCode::from(key))
-                    }
-                },
-                // Register a keyboard interrupt handler for the given scancode.
-            }
+                '^' => KERNEL_STATE.lock().shutdown(),
+                chr => {
+                    KEYBUFF.lock().push(chr);
+                    print!("{chr}");
+                }
+            },
+            DecodedKey::RawKey(key) => match KeyCode::from(key) {
+                KeyCode::AltLeft | KeyCode::AltRight => (),
+                kc => print!("{kc:?}"),
+            },
         }
     }
+
     unsafe {
         PICS.lock()
             .notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());

ableos/src/arch/x86_64/task_switcher.rs

@@ -78,6 +78,22 @@ pub unsafe extern "C" fn switch_to_next() -> ! {
             in(reg) sp,
             options(noreturn),
         ),
-        Task::Spawn(_) => todo!("task spawning"),
+        Task::Spawn {
+            function,
+            stack_start,
+        } => asm!(
+            "add rsp, 160", // Move above saved registries
+            "mov [rsp], {ip}", // Set task's instruction pointer
+            "mov [rsp + 24], {sp}", // Set task's stack pointer
+
+            // Signalise the end of the interrupt and return
+            "mov al, 32",
+            "out 20h, al",
+            "iretq",
+
+            ip = in(reg) function,
+            sp = in(reg) stack_start,
+            options(noreturn),
+        ),
     }
 }

ableos/src/kmain.rs

@@ -1,6 +1,7 @@
 #![allow(clippy::empty_loop)]
 
 use crate::arch::drivers::sysinfo::master;
+use crate::scheduler::SCHEDULER;
 use crate::{
     arch::{init, sloop},
     relib::network::socket::{SimpleSock, Socket},
@@ -24,8 +25,9 @@ pub fn kernel_main() -> ! {
         log::set_max_level(log::LevelFilter::Off);
     }
 
-    // start_facepalm();
-    scratchpad();
+    x86_64::instructions::interrupts::without_interrupts(|| {
+        SCHEDULER.lock().enqueue_spawn(scratchpad);
+    });
 
     sloop()
 }

ableos/src/scheduler.rs

@@ -3,9 +3,12 @@ use spin::{Lazy, Mutex};
 
 pub static SCHEDULER: Lazy<Mutex<Scheduler>> = Lazy::new(|| Mutex::new(Scheduler::default()));
 
+/// Task's stack size (in kiB)
+const STACK_SIZE: usize = 512;
+
 pub enum Task {
     Suspended(u64),
-    Spawn(fn()),
+    Spawn { function: fn(), stack_start: usize },
 }
 
 #[derive(Default)]
@@ -14,8 +17,17 @@ pub struct Scheduler {
 }
 
 impl Scheduler {
-    pub fn enqueue_spawn(&mut self, f: fn()) {
-        self.task_queue.push_back(Task::Spawn(f));
+    pub fn enqueue_spawn(&mut self, function: fn()) {
+        self.task_queue.push_back(Task::Spawn {
+            function,
+            stack_start: unsafe {
+                let size = STACK_SIZE * 1024;
+                alloc::alloc::alloc(
+                    alloc::alloc::Layout::from_size_align(size, 1).expect("invalid layout"),
+                )
+                .add(size - 1) as _
+            },
+        });
     }
 
     pub fn enqueue_suspended(&mut self, sp: u64) {