Add BootServices::exit method; Make PointerMode's fields public for checking against support of a pointer device (#261)

Author: HTGAzureX1212

src/proto/console/pointer/mod.rs

@@ -61,11 +61,11 @@ impl<'boot> Pointer<'boot> {
 #[derive(Debug, Copy, Clone)]
 #[repr(C)]
 pub struct PointerMode {
-    // The pointer device's resolution on the X/Y/Z axis in counts/mm.
-    // If a value is 0, then the device does _not_ support that axis.
-    resolution: (u64, u64, u64),
+    /// The pointer device's resolution on the X/Y/Z axis in counts/mm.
+    /// If a value is 0, then the device does _not_ support that axis.
+    pub resolution: (u64, u64, u64),
     /// Whether the devices has a left button / right button.
-    has_button: (bool, bool),
+    pub has_button: (bool, bool),
 }
 
 /// The relative change in the pointer's state.

src/table/boot.rs

@@ -96,7 +96,12 @@ pub struct BootServices {
         exit_data_size: *mut usize,
         exit_data: &mut *mut Char16,
     ) -> Status,
-    exit: usize,
+    exit: extern "efiapi" fn(
+        image_handle: Handle,
+        exit_status: Status,
+        exit_data_size: usize,
+        exit_data: *mut Char16,
+    ) -> !,
     unload_image: extern "efiapi" fn(image_handle: Handle) -> Status,
     exit_boot_services:
         unsafe extern "efiapi" fn(image_handle: Handle, map_key: MemoryMapKey) -> Status,
@@ -485,6 +490,25 @@ impl BootServices {
         }
     }
 
+    /// Exits the UEFI application and returns control to the UEFI component
+    /// that started the UEFI application.
+    ///
+    /// # Safety
+    ///
+    /// This function is unsafe because it is up to the caller to ensure that
+    /// all resources allocated by the application is freed before invoking
+    /// exit and returning control to the UEFI component that started the UEFI
+    /// application.
+    pub unsafe fn exit(
+        &self,
+        image_handle: Handle,
+        exit_status: Status,
+        exit_data_size: usize,
+        exit_data: *mut Char16,
+    ) -> ! {
+        (self.exit)(image_handle, exit_status, exit_data_size, exit_data)
+    }
+
     /// Exits the UEFI boot services
     ///
     /// This unsafe method is meant to be an implementation detail of the safe