Rename aster-frame to ostd

ostd/src/prelude.rs

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MPL-2.0
+
+//! The prelude.
+
+/// A specialized [`Result`] type for this crate.
+///
+/// [`Result`]: core::result::Result
+pub type Result<T> = core::result::Result<T, crate::error::Error>;
+
+pub(crate) use alloc::{boxed::Box, sync::Arc, vec::Vec};
+pub(crate) use core::any::Any;
+
+pub use aster_main::aster_main;
+
+pub use crate::{
+    early_print as print, early_println as println,
+    mm::{Paddr, Vaddr},
+    panicking::abort,
+};