From a577062dae0b25f0e249b5032435413fd3cb547c Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Mon, 3 Aug 2020 22:15:46 +0200
Subject: [PATCH] Add dummy-system-time process

---
 kernel/standalone/src/kernel.rs       |  2 ++
 modules/Cargo.lock                    | 19 ++++++++++++
 modules/Cargo.toml                    |  1 +
 modules/dummy-system-time/Cargo.toml  | 12 ++++++++
 modules/dummy-system-time/src/main.rs | 42 +++++++++++++++++++++++++++
 5 files changed, 76 insertions(+)
 create mode 100644 modules/dummy-system-time/Cargo.toml
 create mode 100644 modules/dummy-system-time/src/main.rs

diff --git a/kernel/standalone/src/kernel.rs b/kernel/standalone/src/kernel.rs
index d67d56dbd..8c6d387a5 100644
--- a/kernel/standalone/src/kernel.rs
+++ b/kernel/standalone/src/kernel.rs
@@ -84,6 +84,8 @@ where
             ))
             .with_startup_process(build_wasm_module!("../../../modules/compositor"))
             .with_startup_process(build_wasm_module!("../../../modules/pci-printer"))
+            // TODO: actually implement system-time and remove this dummy; https://github.com/tomaka/redshirt/issues/542
+            .with_startup_process(build_wasm_module!("../../../modules/dummy-system-time"))
             .with_startup_process(build_wasm_module!("../../../modules/kernel-debug-printer"))
             .with_startup_process(build_wasm_module!("../../../modules/log-to-kernel"))
             .with_startup_process(build_wasm_module!("../../../modules/http-server"))
diff --git a/modules/Cargo.lock b/modules/Cargo.lock
index ab66864e6..2cd2c89f4 100644
--- a/modules/Cargo.lock
+++ b/modules/Cargo.lock
@@ -521,6 +521,15 @@ dependencies = [
  "generic-array 0.14.2",
 ]
 
+[[package]]
+name = "dummy-system-time"
+version = "0.1.0"
+dependencies = [
+ "redshirt-interface-interface",
+ "redshirt-syscalls",
+ "redshirt-system-time-interface",
+]
+
 [[package]]
 name = "e1000"
 version = "0.1.0"
@@ -2107,6 +2116,16 @@ dependencies = [
  "spinning_top",
 ]
 
+[[package]]
+name = "redshirt-system-time-interface"
+version = "0.1.0"
+dependencies = [
+ "futures",
+ "parity-scale-codec",
+ "pin-project",
+ "redshirt-syscalls",
+]
+
 [[package]]
 name = "redshirt-tcp-interface"
 version = "0.1.0"
diff --git a/modules/Cargo.toml b/modules/Cargo.toml
index a00babed7..2684e62dd 100644
--- a/modules/Cargo.toml
+++ b/modules/Cargo.toml
@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "compositor",
+    "dummy-system-time",
     "e1000",
     "hello-world",
     "http-server",
diff --git a/modules/dummy-system-time/Cargo.toml b/modules/dummy-system-time/Cargo.toml
new file mode 100644
index 000000000..07c051020
--- /dev/null
+++ b/modules/dummy-system-time/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "dummy-system-time"
+version = "0.1.0"
+license = "GPL-3.0-or-later"
+authors = ["Pierre Krieger <pierre.krieger1708@gmail.com>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+redshirt-interface-interface = { path = "../../interfaces/interface" }
+redshirt-syscalls = { path = "../../interfaces/syscalls" }
+redshirt-system-time-interface = { path = "../../interfaces/system-time" }
diff --git a/modules/dummy-system-time/src/main.rs b/modules/dummy-system-time/src/main.rs
new file mode 100644
index 000000000..7ea99b765
--- /dev/null
+++ b/modules/dummy-system-time/src/main.rs
@@ -0,0 +1,42 @@
+// Copyright (C) 2019-2020  Pierre Krieger
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use redshirt_syscalls::{ffi::DecodedInterfaceOrDestroyed, Decode as _};
+use redshirt_system_time_interface::ffi as sys_time_ffi;
+
+fn main() {
+    redshirt_syscalls::block_on(async_main())
+}
+
+async fn async_main() {
+    redshirt_interface_interface::register_interface(sys_time_ffi::INTERFACE)
+        .await
+        .unwrap();
+
+    loop {
+        let interface_event = redshirt_syscalls::next_interface_message().await;
+        let msg = match interface_event {
+            DecodedInterfaceOrDestroyed::Interface(msg) => msg,
+            DecodedInterfaceOrDestroyed::ProcessDestroyed(_) => continue,
+        };
+
+        let msg_data = sys_time_ffi::TimeMessage::decode(msg.actual_data).unwrap();
+        let sys_time_ffi::TimeMessage::GetSystem = msg_data;
+
+        if let Some(id) = msg.message_id {
+            redshirt_syscalls::emit_answer(id, &0u128);
+        }
+    }
+}