diff --git a/sim/mcuboot-sys/src/lib.rs b/sim/mcuboot-sys/src/lib.rs
index 8acb246..9f4cf47 100644
--- a/sim/mcuboot-sys/src/lib.rs
+++ b/sim/mcuboot-sys/src/lib.rs
@@ -10,3 +10,38 @@
 pub mod api;
 
 pub use crate::area::{AreaDesc, FlashId};
+
+/// For testing the ram load feature, we need to emulate a block of RAM and be able to pass that
+/// down to the C code.  The call down to boot_go should go through this object so that the buffer
+/// itself is managed properly.
+pub struct RamBlock {
+    ram: Vec<u8>,
+    offset: u32, // 32-bit offset.
+}
+
+impl RamBlock {
+    pub fn new(size: u32, offset: u32) -> RamBlock {
+        RamBlock {
+            ram: vec![0; size as usize],
+            offset: offset,
+        }
+    }
+
+    /// Borrow the RAM buffer, with 'offset' being the beginning of the buffer.
+    pub fn borrow(&self) -> &[u8] {
+        &self.ram
+    }
+
+    pub fn invoke<F, R>(&self, act: F) -> R
+        where F: FnOnce() -> R
+    {
+        api::set_ram_info(api::BootsimRamInfo {
+            start: self.offset,
+            size: self.ram.len() as u32,
+            base: &self.ram[0] as *const u8 as usize - self.offset as usize,
+        });
+        let result = act();
+        api::clear_ram_info();
+        result
+    }
+}