Allow userspace to handle IRQs (WIP). Create basic keyboard handler

Makefile

@@ -26,6 +26,7 @@ clean:
 	cargo clean --manifest-path libstd/Cargo.toml
 	cargo clean --manifest-path init/Cargo.toml
 	cargo clean --manifest-path ion/Cargo.toml
+	cargo clean --manifest-path drivers/atkbd/Cargo.toml
 	cargo clean --manifest-path drivers/pcid/Cargo.toml
 	rm -rf build
 
@@ -133,4 +134,8 @@ $(BUILD)/pcid: drivers/pcid/Cargo.toml drivers/pcid/src/** $(BUILD)/libstd.rlib
 	$(CARGO) rustc --manifest-path $< $(CARGOFLAGS) -o $@
 	strip $@
 
-$(BUILD)/initfs.rs: $(BUILD)/init $(BUILD)/ion $(BUILD)/pcid
+$(BUILD)/ps2d: drivers/ps2d/Cargo.toml drivers/ps2d/src/** $(BUILD)/libstd.rlib
+	$(CARGO) rustc --manifest-path $< $(CARGOFLAGS) -o $@
+	strip $@
+
+$(BUILD)/initfs.rs: $(BUILD)/init $(BUILD)/ion $(BUILD)/pcid $(BUILD)/ps2d

arch/x86_64/src/interrupt/irq.rs

@@ -17,6 +17,14 @@ unsafe fn slave_ack() {
     master_ack();
 }
 
+pub unsafe fn acknowledge(irq: usize) {
+    if irq >= 8 {
+        slave_ack();
+    } else {
+        master_ack();
+    }
+}
+
 interrupt!(pit, {
     COUNTS.lock()[0] += 1;
     master_ack();
@@ -24,10 +32,6 @@ interrupt!(pit, {
 
 interrupt!(keyboard, {
     COUNTS.lock()[1] += 1;
-    if let Some(ref mut keyboard) = *PS2_KEYBOARD.lock(){
-        keyboard.on_irq();
-    }
-    master_ack();
 });
 
 interrupt!(cascade, {

drivers/ps2d/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "ps2d"
+version = "0.1.0"
+
+[dependencies.syscall]
+path = "../../syscall/"

drivers/ps2d/src/main.rs

@@ -0,0 +1,59 @@
+#![feature(asm)]
+
+extern crate syscall;
+
+use std::fs::File;
+use std::io::{Read, Write};
+use std::thread;
+
+use syscall::iopl;
+
+fn main() {
+    if true {
+        unsafe {
+            iopl(3).expect("pskbd: failed to get I/O permission");
+            asm!("cli" :::: "intel", "volatile");
+        }
+
+        let mut file = File::open("irq:1").expect("pskbd: failed to open irq:1");
+
+        println!("pskbd: Reading keyboard IRQs");
+
+        loop {
+            let mut irqs = [0; 8];
+            file.read(&mut irqs).expect("pskbd: failed to read irq:1");
+
+            let data: u8;
+            unsafe {
+                asm!("in al, dx" : "={al}"(data) : "{dx}"(0x60) : : "intel", "volatile");
+            }
+
+            println!("pskbd: IRQ {}: {:X}", unsafe { *(irqs.as_ptr() as *const usize) }, data);
+
+            file.write(&irqs).expect("pskbd: failed to write irq:1");
+        }
+    } else {
+        unsafe {
+            iopl(3).expect("psmsd: failed to get I/O permission");
+            asm!("cli" :::: "intel", "volatile");
+        }
+
+        let mut file = File::open("irq:12").expect("psmsd: failed to open irq:12");
+
+        println!("psmsd: Reading mouse IRQs");
+
+        loop {
+            let mut count = [0; 8];
+            file.read(&mut count).expect("psmsd: failed to read irq:12");
+
+            let data: u8;
+            unsafe {
+                asm!("in al, dx" : "={al}"(data) : "{dx}"(0x60) : : "intel", "volatile");
+            }
+
+            println!("psmsd: IRQ: {:X}", data);
+
+            file.write(&count).expect("psmsd: failed to write irq:12");
+        }
+    }
+}

kernel/context/memory.rs

@@ -13,7 +13,7 @@ pub struct Memory {
     flags: EntryFlags
 }
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub enum SharedMemory {
     Owned(Arc<Mutex<Memory>>),
     Borrowed(Weak<Mutex<Memory>>)

kernel/scheme/initfs.rs

@@ -21,7 +21,8 @@ impl InitFsScheme {
         files.insert(b"bin/init", include_bytes!("../../build/userspace/init"));
         files.insert(b"bin/ion", include_bytes!("../../build/userspace/ion"));
         files.insert(b"bin/pcid", include_bytes!("../../build/userspace/pcid"));
-        files.insert(b"etc/init.rc", b"echo testing\ninitfs:bin/pcid\ninitfs:bin/ion");
+        files.insert(b"bin/ps2d", include_bytes!("../../build/userspace/ps2d"));
+        files.insert(b"etc/init.rc", b"echo testing\n#initfs:bin/pcid\ninitfs:bin/ps2d\n#initfs:bin/ion");
 
         InitFsScheme {
             next_id: 0,

kernel/scheme/irq.rs

@@ -1,6 +1,6 @@
 use core::{mem, str};
 
-use arch::interrupt::irq::COUNTS;
+use arch::interrupt::irq::{COUNTS, acknowledge};
 use context;
 use syscall::{Error, Result};
 use super::Scheme;
@@ -10,7 +10,9 @@ pub struct IrqScheme;
 impl Scheme for IrqScheme {
     fn open(&mut self, path: &[u8], _flags: usize) -> Result<usize> {
         let path_str = str::from_utf8(path).or(Err(Error::NoEntry))?;
+
         let id = path_str.parse::<usize>().or(Err(Error::NoEntry))?;
+
         if id < COUNTS.lock().len() {
             Ok(id)
         } else {
@@ -19,35 +21,49 @@ impl Scheme for IrqScheme {
     }
 
     fn dup(&mut self, file: usize) -> Result<usize> {
-        Ok(file)
+        Err(Error::NotPermitted)
     }
 
     fn read(&mut self, file: usize, buffer: &mut [u8]) -> Result<usize> {
         // Ensures that the length of the buffer is larger than the size of a usize
         if buffer.len() >= mem::size_of::<usize>() {
-            let current = COUNTS.lock()[file];
+            let prev = { COUNTS.lock()[file] };
             loop {
-                let next = COUNTS.lock()[file];
+                {
-                if next != current {
+                    let current = COUNTS.lock()[file];
+                    if prev != current {
                         // Safe if the length of the buffer is larger than the size of a usize
                         assert!(buffer.len() >= mem::size_of::<usize>());
-                    unsafe { *(buffer.as_mut_ptr() as *mut usize) = next };
+                        unsafe { *(buffer.as_mut_ptr() as *mut usize) = current; }
                         return Ok(mem::size_of::<usize>());
-                } else {
+                    }
+                }
+
                 // Safe if all locks have been dropped
                 unsafe { context::switch(); }
             }
-            }
         } else {
             Err(Error::InvalidValue)
         }
     }
 
-    fn write(&mut self, _file: usize, _buffer: &[u8]) -> Result<usize> {
+    fn write(&mut self, file: usize, buffer: &[u8]) -> Result<usize> {
-        Err(Error::NotPermitted)
+        if buffer.len() >= mem::size_of::<usize>() {
+            assert!(buffer.len() >= mem::size_of::<usize>());
+            let prev = unsafe { *(buffer.as_ptr() as *const usize) };
+            let current = COUNTS.lock()[file];
+            if prev == current {
+                unsafe { acknowledge(file); }
+                return Ok(mem::size_of::<usize>());
+            } else {
+                return Ok(0);
+            }
+        } else {
+            Err(Error::InvalidValue)
+        }
     }
 
-    fn fsync(&mut self, file: usize) -> Result<()> {
+    fn fsync(&mut self, _file: usize) -> Result<()> {
         Ok(())
     }
 

kernel/syscall/process.rs

@@ -96,11 +96,11 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<usize> {
 
             if flags & CLONE_VM == CLONE_VM {
                 for memory_shared in context.image.iter() {
-                    image.push(memory_shared.borrow());
+                    image.push(memory_shared.clone());
                 }
 
                 if let Some(ref heap_shared) = context.heap {
-                    heap_option = Some(heap_shared.borrow());
+                    heap_option = Some(heap_shared.clone());
                 }
             } else {
                 for memory_shared in context.image.iter() {