try to set variable from windows

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

framework_lib/Cargo.toml

@@ -73,6 +73,7 @@ features = [
     "Win32_System_Ioctl",
     "Win32_System_SystemInformation",
     "Win32_System_SystemServices",
+    "Win32_System_WindowsProgramming",
     # For HID devices
     "Win32_Devices_DeviceAndDriverInstallation",
     "Win32_Devices_HumanInterfaceDevice",

framework_lib/src/os_specific.rs

@@ -37,6 +37,9 @@ pub fn get_os_version() -> String {
     }
 }
 
+#[cfg(windows)]
+use windows::{core::*, Win32::System::WindowsProgramming::*};
+
 /// Sleep a number of microseconds
 pub fn sleep(micros: u64) {
     let duration = Duration::from_micros(micros);
@@ -51,3 +54,24 @@ pub fn sleep(micros: u64) {
         uefi::boot::stall(duration);
     }
 }
+
+#[cfg(windows)]
+pub fn set_dbx() -> Option<()> {
+    set_uefi_var("dbx", "d719b2cb-3d3a-4596-a3bc-dad00e67656f", &[], 0)
+}
+
+#[cfg(windows)]
+pub fn set_uefi_var(name: &str, guid: &str, value: &[u8], attributes: u32) -> Option<()> {
+    unsafe {
+        SetFirmwareEnvironmentVariableExW(
+            // PCWSTR
+            &HSTRING::from(name),
+            // PCWSTR
+            &HSTRING::from(guid),
+            Some(value.as_ptr() as *const core::ffi::c_void),
+            value.len() as u32,
+            attributes,
+        )
+        .ok()
+    }
+}