1 files changed, 19 insertions, 3 deletions

diff --git a/rsnix/src/uefi.rs b/rsnix/src/uefi.rs
index f947c90..c311ad9 100644
--- a/rsnix/src/uefi.rs
+++ b/rsnix/src/uefi.rs
@@ -321,12 +321,28 @@ pub struct GopMode {
 
 #[repr(C)]
 pub struct GraphicsOutputProtocol {
-    pub query_mode: *mut c_void,
-    pub set_mode: *mut c_void,
-    pub get_current_mode: *mut c_void,
+    pub query_mode: EfiGopQueryMode,
+    pub set_mode: EfiGopSetMode,
+    pub get_current_mode: EfiGopGetMode,
     pub mode: *mut GopMode,
 }
 
+pub type EfiGopQueryMode = unsafe extern "efiapi" fn(
+    *mut GraphicsOutputProtocol,
+    u32,                   // mode number
+    *mut usize,            // out: size of info
+    *mut *mut GopModeInfo, // out: info pointer (firmware-owned)
+) -> Status;
+
+pub type EfiGopSetMode = unsafe extern "efiapi" fn(*mut GraphicsOutputProtocol, u32) -> Status;
+
+pub type EfiGopGetMode = unsafe extern "efiapi" fn(
+    *mut GraphicsOutputProtocol,
+    *mut u32,              // out: current mode
+    *mut u32,              // out: size of info
+    *mut *mut GopModeInfo, // out: info pointer
+) -> Status;
+
 // ---------------------------------------------------------------------------
 // System table
 // ---------------------------------------------------------------------------