From 37ab0406bbc646d7941445aaf5c2d35eb5ab26d1 Mon Sep 17 00:00:00 2001
From: Alex Zenla <alex@edera.dev>
Date: Thu, 30 Oct 2025 11:47:35 -0400
Subject: [PATCH] feat(bootloader-interface): implement support for UEFI
 firmware information

---
 src/integrations/bootloader_interface.rs | 16 ++++++++++++++++
 src/main.rs                              |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/src/integrations/bootloader_interface.rs b/src/integrations/bootloader_interface.rs
index 0e6cf91..18f71af 100644
--- a/src/integrations/bootloader_interface.rs
+++ b/src/integrations/bootloader_interface.rs
@@ -58,6 +58,22 @@ impl BootloaderInterface {
         Self::set_cstr16("LoaderEntrySelected", &entry)
     }
 
+    /// Tell the system about the UEFI firmware we are running on.
+    pub fn set_firmware_info() -> Result<()> {
+        // Format the firmware information string into something human-readable.
+        let firmware_info = format!(
+            "{} {}.{:02}",
+            uefi::system::firmware_vendor(),
+            uefi::system::firmware_revision() >> 16,
+            uefi::system::firmware_revision() & 0xFFFFF,
+        );
+        Self::set_cstr16("LoaderFirmwareInfo", &firmware_info)?;
+
+        // Format the firmware revision into something human-readable.
+        let firmware_type = format!("UEFI {:02}", uefi::system::firmware_revision());
+        Self::set_cstr16("LoaderFirmwareType", &firmware_type)
+    }
+
     /// The [VariableAttributes] for bootloader interface variables.
     fn attributes() -> VariableAttributes {
         VariableAttributes::BOOTSERVICE_ACCESS | VariableAttributes::RUNTIME_ACCESS
diff --git a/src/main.rs b/src/main.rs
index 8385dd5..fb9616a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -72,6 +72,10 @@ fn run() -> Result<()> {
     BootloaderInterface::mark_init(&timer)
         .context("unable to mark initialization in bootloader interface")?;
 
+    // Tell the bootloader interface what firmware we are running on.
+    BootloaderInterface::set_firmware_info()
+        .context("unable to set firmware info in bootloader interface")?;
+
     // Parse the options to the sprout executable.
     let options = SproutOptions::parse().context("unable to parse options")?;