uefi: LoadImageSource: use BootPolicy

This adds the new `BootPolicy` type into `LoadImageSource`.

Author: phip1611

uefi-test-runner/src/bin/shell_launcher.rs

@@ -18,6 +18,7 @@ use uefi::prelude::*;
 use uefi::proto::device_path::build::{self, DevicePathBuilder};
 use uefi::proto::device_path::{DevicePath, DeviceSubType, DeviceType, LoadedImageDevicePath};
 use uefi::proto::loaded_image::LoadedImage;
+use uefi::proto::BootPolicy;
 
 /// Get the device path of the shell app. This is the same as the
 /// currently-loaded image's device path, but with the file path part changed.
@@ -53,7 +54,7 @@ fn efi_main() -> Status {
         boot::image_handle(),
         LoadImageSource::FromDevicePath {
             device_path: shell_image_path,
-            from_boot_manager: false,
+            boot_policy: BootPolicy::ExactMatch,
         },
     )
     .expect("failed to load shell app");

uefi-test-runner/src/boot/mod.rs

@@ -3,6 +3,7 @@ use uefi::fs::FileSystem;
 use uefi::proto::console::text::Output;
 use uefi::proto::device_path::media::FilePath;
 use uefi::proto::device_path::{DevicePath, LoadedImageDevicePath};
+use uefi::proto::BootPolicy;
 use uefi::table::boot::{BootServices, LoadImageSource, SearchType};
 use uefi::table::{Boot, SystemTable};
 use uefi::{boot, CString16, Identify};
@@ -122,7 +123,7 @@ fn test_load_image(bt: &BootServices) {
     {
         let load_source = LoadImageSource::FromDevicePath {
             device_path: image_device_path,
-            from_boot_manager: false,
+            boot_policy: BootPolicy::ExactMatch,
         };
         let _ = bt
             .load_image(bt.image_handle(), load_source)

uefi/CHANGELOG.md

@@ -43,6 +43,8 @@ details of a significant change to the API in this release.
   > use uefi::mem::memory_map::{MemoryMap, MemoryMapMut, MemoryType};
   > use uefi::table::boot::BootServices;
   ```
+- **Breaking:** Added a new `BootPolicy` type which breaks existing usages
+  of `LoadImageSource`.
 
 [funcmigrate]: ../docs/funcs_migration.md
 

uefi/src/boot.rs

@@ -21,11 +21,11 @@ use core::{mem, slice};
 use uefi::{table, Char16, Error, Event, Guid, Handle, Result, Status, StatusExt};
 use uefi_raw::table::boot::InterfaceType;
 
-#[cfg(feature = "alloc")]
-use {alloc::vec::Vec, uefi::ResultExt};
-
 #[cfg(doc)]
 use crate::proto::device_path::LoadedImageDevicePath;
+use uefi::proto::BootPolicy;
+#[cfg(feature = "alloc")]
+use {alloc::vec::Vec, uefi::ResultExt};
 
 pub use uefi::table::boot::{
     AllocateType, EventNotifyFn, LoadImageSource, OpenProtocolAttributes, OpenProtocolParams,
@@ -1002,17 +1002,17 @@ pub fn load_image(parent_image_handle: Handle, source: LoadImageSource) -> Resul
     match source {
         LoadImageSource::FromBuffer { buffer, file_path } => {
             // Boot policy is ignored when loading from source buffer.
-            boot_policy = 0;
+            boot_policy = BootPolicy::ExactMatch;
 
             device_path = file_path.map(|p| p.as_ffi_ptr()).unwrap_or(ptr::null());
             source_buffer = buffer.as_ptr();
             source_size = buffer.len();
         }
         LoadImageSource::FromDevicePath {
             device_path: file_path,
-            from_boot_manager,
+            boot_policy: new_boot_policy,
         } => {
-            boot_policy = u8::from(from_boot_manager);
+            boot_policy = new_boot_policy;
             device_path = file_path.as_ffi_ptr();
             source_buffer = ptr::null();
             source_size = 0;
@@ -1022,7 +1022,7 @@ pub fn load_image(parent_image_handle: Handle, source: LoadImageSource) -> Resul
     let mut image_handle = ptr::null_mut();
     unsafe {
         (bt.load_image)(
-            boot_policy,
+            boot_policy.into(),
             parent_image_handle.as_ptr(),
             device_path.cast(),
             source_buffer,

uefi/src/table/boot.rs

@@ -10,7 +10,7 @@ use crate::mem::memory_map::*;
 use crate::proto::device_path::DevicePath;
 use crate::proto::loaded_image::LoadedImage;
 use crate::proto::media::fs::SimpleFileSystem;
-use crate::proto::{Protocol, ProtocolPointer};
+use crate::proto::{BootPolicy, Protocol, ProtocolPointer};
 use crate::util::opt_nonnull_to_ptr;
 use crate::{Char16, Error, Event, Guid, Handle, Result, Status, StatusExt};
 #[cfg(feature = "alloc")]
@@ -848,17 +848,17 @@ impl BootServices {
         match source {
             LoadImageSource::FromBuffer { buffer, file_path } => {
                 // Boot policy is ignored when loading from source buffer.
-                boot_policy = 0;
+                boot_policy = BootPolicy::ExactMatch;
 
                 device_path = file_path.map(|p| p.as_ffi_ptr()).unwrap_or(ptr::null());
                 source_buffer = buffer.as_ptr();
                 source_size = buffer.len();
             }
             LoadImageSource::FromDevicePath {
                 device_path: file_path,
-                from_boot_manager,
+                boot_policy: new_boot_policy,
             } => {
-                boot_policy = u8::from(from_boot_manager);
+                boot_policy = new_boot_policy;
                 device_path = file_path.as_ffi_ptr();
                 source_buffer = ptr::null();
                 source_size = 0;
@@ -868,7 +868,7 @@ impl BootServices {
         let mut image_handle = ptr::null_mut();
         unsafe {
             (self.0.load_image)(
-                boot_policy,
+                boot_policy.into(),
                 parent_image_handle.as_ptr(),
                 device_path.cast(),
                 source_buffer,
@@ -1403,9 +1403,10 @@ pub enum LoadImageSource<'a> {
 
     /// Load an image via the [`SimpleFileSystem`] protocol. If there is
     /// no instance of that protocol associated with the path then the
-    /// behavior depends on `from_boot_manager`. If `true`, attempt to
-    /// load via the `LoadFile` protocol. If `false`, attempt to load
-    /// via the `LoadFile2` protocol, then fall back to `LoadFile`.
+    /// behavior depends on [`BootPolicy`]. If [`BootPolicy::BootSelection`], 
+    /// attempt to load via the `LoadFile` protocol. If 
+    /// [`BootPolicy::ExactMatch`], attempt to load via the `LoadFile2` 
+    /// protocol, then fall back to `LoadFile`.
     FromDevicePath {
         /// The full device path from which to load the image.
         ///
@@ -1416,12 +1417,8 @@ pub enum LoadImageSource<'a> {
         /// and not just `\\EFI\\BOOT\\BOOTX64.EFI`.
         device_path: &'a DevicePath,
 
-        /// If there is no instance of [`SimpleFileSystem`] protocol associated
-        /// with the given device path, then this function will attempt to use
-        /// `LoadFileProtocol` (`from_boot_manager` is `true`) or
-        /// `LoadFile2Protocol`, and then `LoadFileProtocol`
-        /// (`from_boot_manager` is `false`).
-        from_boot_manager: bool,
+        /// The [`BootPolicy`] to use.
+        boot_policy: BootPolicy,
     },
 }