[Teton] Move console/shell to rust. WIP

rust/lib/victoriafalls/src/file.rs

@@ -0,0 +1,42 @@
+use crate::OpenFileRequest;
+use crate::VFSClient;
+use alloc::string::ToString;
+use mammoth::zion::ZError;
+
+static mut VFS_CLIENT: Option<VFSClient> = None;
+
+fn get_client() -> &'static mut VFSClient {
+    unsafe {
+        if let None = VFS_CLIENT {
+            let endpoint_cap = yellowstone::from_init_endpoint()
+                .get_endpoint(&yellowstone::GetEndpointRequest {
+                    endpoint_name: "victoriafalls".to_string(),
+                })
+                .expect("Failed to get VFS endpoint");
+
+            VFS_CLIENT = Some(VFSClient::new(endpoint_cap.endpoint));
+        }
+        VFS_CLIENT.as_mut().unwrap()
+    }
+}
+
+pub struct File {
+    memory: mammoth::mem::MemoryRegion,
+}
+
+impl File {
+    pub fn open(path: &str) -> Result<Self, ZError> {
+        let vfs = get_client();
+        let resp = vfs.open_file(&OpenFileRequest {
+            path: path.to_string(),
+        })?;
+
+        Ok(Self {
+            memory: mammoth::mem::MemoryRegion::from_cap(resp.memory)?,
+        })
+    }
+
+    pub fn slice(&self, offset: usize, len: usize) -> &[u8] {
+        &self.memory.slice()[offset..offset + len]
+    }
+}

rust/lib/victoriafalls/src/lib.rs

@@ -0,0 +1,7 @@
+#![no_std]
+
+use core::include;
+
+include!(concat!(env!("OUT_DIR"), "/yunq.rs"));
+
+pub mod file;