uefi: Add special broadcast nvme namespace

Author: seijikun

uefi/CHANGELOG.md

@@ -5,6 +5,7 @@
 - Added `proto::shell::Shell::{var(), set_var(), vars()}`
 - Added `proto::pci::root_bridge::PciRootBridgeIo::configuration()`.
 - Added `proto::pci::root_bridge::PciRootBridgeIo::enumerate()`.
+- Added `proto::nvme::pass_thru::NvmePassThru::broadcast()`.
 
 ## Changed
 - Changed ordering of `proto::pci::PciIoAddress` to (bus -> dev -> fun -> reg -> ext_reg).

uefi/src/proto/nvme/pass_thru.rs

@@ -101,14 +101,26 @@ impl NvmePassThru {
     /// This can be used to send ADMIN commands.
     ///
     /// # Returns
-    /// A [`NvmeNamespaceIterator`] for iterating through the namespaces.
+    /// A [`NvmeNamespace`] addressing the controller (nsid = 0).
     #[must_use]
     pub const fn controller(&self) -> NvmeNamespace<'_> {
         NvmeNamespace {
             proto: &self.0,
             namespace_id: 0,
         }
     }
+
+    /// Get the broadcast namespace (id = 0xffffffff).
+    ///
+    /// # Returns
+    /// A [`NvmeNamespace`] with nsid = 0xffffffff.
+    #[must_use]
+    pub const fn broadcast(&self) -> NvmeNamespace<'_> {
+        NvmeNamespace {
+            proto: &self.0,
+            namespace_id: 0xffffffff,
+        }
+    }
 }
 
 /// Represents one namespace on an NVMe controller.