Implement PIT.

BUG=chromium:908689
TEST=Unit tests in file.

Change-Id: I796478fc65a69c18e70ffeaaac753b722edf9091
Reviewed-on: https://chromium-review.googlesource.com/1413831
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Steve Rutherford <srutherford@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>

Cargo.lock

@@ -88,6 +88,7 @@ dependencies = [
  "crosvm_plugin 0.17.0",
  "data_model 0.1.0",
  "devices 0.1.0",
+ "enumn 0.1.0",
  "gpu_buffer 0.1.0",
  "io_jail 0.1.0",
  "kernel_cmdline 0.1.0",
@@ -139,6 +140,7 @@ dependencies = [
  "bit_field 0.1.0",
  "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "data_model 0.1.0",
+ "enumn 0.1.0",
  "gpu_buffer 0.1.0",
  "gpu_display 0.1.0",
  "gpu_renderer 0.1.0",
@@ -159,6 +161,15 @@ dependencies = [
  "vm_control 0.1.0",
 ]
 
+[[package]]
+name = "enumn"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.21 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "getopts"
 version = "0.2.18"

Cargo.toml

@@ -34,6 +34,7 @@ arch = { path = "arch" }
 audio_streams = "*"
 bit_field = { path = "bit_field" }
 devices = { path = "devices" }
+enumn = { path = "enumn" }
 gpu_buffer = { path = "gpu_buffer", optional = true }
 io_jail = { path = "io_jail" }
 kvm = { path = "kvm" }

devices/Cargo.toml

@@ -16,6 +16,7 @@ data_model = { path = "../data_model" }
 gpu_buffer = { path = "../gpu_buffer", optional = true }
 gpu_display = { path = "../gpu_display", optional = true }
 gpu_renderer = { path = "../gpu_renderer", optional = true }
+enumn = { path = "../enumn" }
 kvm = { path = "../kvm" }
 libc = "*"
 io_jail = { path = "../io_jail" }

devices/src/lib.rs

@@ -8,6 +8,7 @@ extern crate audio_streams;
 extern crate bit_field;
 extern crate byteorder;
 extern crate data_model;
+extern crate enumn;
 extern crate io_jail;
 extern crate kvm;
 extern crate libc;
@@ -30,6 +31,7 @@ mod bus;
 mod cmos;
 mod i8042;
 mod pci;
+mod pit;
 pub mod pl030;
 mod proxy;
 mod serial;
@@ -42,6 +44,7 @@ pub use self::i8042::I8042Device;
 pub use self::pci::{
     Ac97Dev, PciConfigIo, PciConfigMmio, PciDevice, PciDeviceError, PciInterruptPin, PciRoot,
 };
+pub use self::pit::{Pit, PitError};
 pub use self::pl030::Pl030;
 pub use self::proxy::Error as ProxyError;
 pub use self::proxy::ProxyDevice;