From 24e7f77803021f6fadad1df1cf52bdebb49172a3 Mon Sep 17 00:00:00 2001
From: Chen Chengjun <chenchengjun.ccj@antgroup.com>
Date: Mon, 12 Aug 2024 15:55:59 +0800
Subject: [PATCH] Add duplicate_frame method

---
 kernel/aster-nix/src/vm/mod.rs  |  1 +
 kernel/aster-nix/src/vm/util.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 kernel/aster-nix/src/vm/util.rs

diff --git a/kernel/aster-nix/src/vm/mod.rs b/kernel/aster-nix/src/vm/mod.rs
index a4970b5e1..6a932007f 100644
--- a/kernel/aster-nix/src/vm/mod.rs
+++ b/kernel/aster-nix/src/vm/mod.rs
@@ -18,5 +18,6 @@
 
 pub mod page_fault_handler;
 pub mod perms;
+pub mod util;
 pub mod vmar;
 pub mod vmo;
diff --git a/kernel/aster-nix/src/vm/util.rs b/kernel/aster-nix/src/vm/util.rs
new file mode 100644
index 000000000..68c445fe7
--- /dev/null
+++ b/kernel/aster-nix/src/vm/util.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use ostd::mm::{Frame, FrameAllocOptions};
+
+use crate::prelude::*;
+
+/// Creates a new `Frame` and initializes it with the contents of the `src`.
+pub fn duplicate_frame(src: &Frame) -> Result<Frame> {
+    let new_frame = FrameAllocOptions::new(1).uninit(true).alloc_single()?;
+    new_frame.copy_from(src);
+    Ok(new_frame)
+}