Orbital (#16)

* Port previous ethernet scheme

* Add ipd

* Fix initfs rebuilds, use QEMU user networking addresses in ipd

* Add tcp/udp, netutils, dns, and network config

* Add fsync to network driver

* Add dns, router, subnet by default

* Fix e1000 driver. Make ethernet and IP non-blocking to avoid deadlocks

* Add orbital server, WIP

* Add futex

* Add orbutils and orbital

* Update libstd, orbutils, and orbital
Move ANSI key encoding to vesad

* Add orbital assets

* Update orbital

* Update to add login manager

* Add blocking primitives, block for most things except waitpid, update orbital

* Wait in waitpid and IRQ, improvements for other waits

* Fevent in root scheme

* WIP: Switch to using fevent

* Reorganize

* Event based e1000d driver

* Superuser-only access to some network schemes, display, and disk

* Superuser root and irq schemes

* Fix orbital

crates/dma/Cargo.toml

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

crates/dma/src/lib.rs

@@ -0,0 +1,80 @@
+#![feature(question_mark)]
+
+extern crate syscall;
+
+use std::{mem, ptr};
+use std::ops::{Deref, DerefMut};
+
+use syscall::Result;
+
+struct PhysBox {
+    address: usize,
+    size: usize
+}
+
+impl PhysBox {
+    fn new(size: usize) -> Result<PhysBox> {
+        let address = unsafe { syscall::physalloc(size)? };
+        Ok(PhysBox {
+            address: address,
+            size: size
+        })
+    }
+}
+
+impl Drop for PhysBox {
+    fn drop(&mut self) {
+        let _ = unsafe { syscall::physfree(self.address, self.size) };
+    }
+}
+
+pub struct Dma<T> {
+    phys: PhysBox,
+    virt: *mut T
+}
+
+impl<T> Dma<T> {
+    pub fn new(value: T) -> Result<Dma<T>> {
+        let phys = PhysBox::new(mem::size_of::<T>())?;
+        let virt = unsafe { syscall::physmap(phys.address, phys.size, syscall::MAP_WRITE)? } as *mut T;
+        unsafe { ptr::write(virt, value); }
+        Ok(Dma {
+            phys: phys,
+            virt: virt
+        })
+    }
+
+    pub fn zeroed() -> Result<Dma<T>> {
+        let phys = PhysBox::new(mem::size_of::<T>())?;
+        let virt = unsafe { syscall::physmap(phys.address, phys.size, syscall::MAP_WRITE)? } as *mut T;
+        unsafe { ptr::write_bytes(virt as *mut u8, 0, phys.size); }
+        Ok(Dma {
+            phys: phys,
+            virt: virt
+        })
+    }
+
+    pub fn physical(&self) -> usize {
+        self.phys.address
+    }
+}
+
+impl<T> Deref for Dma<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        unsafe { &*self.virt }
+    }
+}
+
+impl<T> DerefMut for Dma<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.virt }
+    }
+}
+
+impl<T> Drop for Dma<T> {
+    fn drop(&mut self) {
+        unsafe { drop(ptr::read(self.virt)); }
+        let _ = unsafe { syscall::physunmap(self.virt as usize) };
+    }
+}