Remove the shim kernel crate

kernel/src/process/status.rs

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#![allow(dead_code)]
+
+//! The process status
+
+use super::TermStatus;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ProcessStatus {
+    // Not ready to run
+    Uninit,
+    /// Can be scheduled to run
+    Runnable,
+    /// Exit while not reaped by parent
+    Zombie(TermStatus),
+}
+
+impl ProcessStatus {
+    pub fn set_zombie(&mut self, term_status: TermStatus) {
+        *self = ProcessStatus::Zombie(term_status);
+    }
+
+    pub fn is_zombie(&self) -> bool {
+        matches!(self, ProcessStatus::Zombie(_))
+    }
+
+    pub fn set_runnable(&mut self) {
+        *self = ProcessStatus::Runnable;
+    }
+
+    pub fn is_runnable(&self) -> bool {
+        *self == ProcessStatus::Runnable
+    }
+}