Rollup merge of #117177 - Ayush1325:uefi-alloc-type, r=workingjubilee

Use ImageDataType for allocation type

Suggested at #100499

cc `@dvdhrm`
cc `@nicholasbishop`

library/std/src/sys/uefi/alloc.rs

@@ -1,22 +1,38 @@
 //! Global Allocator for UEFI.
 //! Uses [r-efi-alloc](https://crates.io/crates/r-efi-alloc)
 
-use crate::alloc::{GlobalAlloc, Layout, System};
+use r_efi::protocols::loaded_image;
 
-const MEMORY_TYPE: u32 = r_efi::efi::LOADER_DATA;
+use crate::alloc::{GlobalAlloc, Layout, System};
+use crate::sync::OnceLock;
+use crate::sys::uefi::helpers;
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        static EFI_MEMORY_TYPE: OnceLock<u32> = OnceLock::new();
+
         // Return null pointer if boot services are not available
         if crate::os::uefi::env::boot_services().is_none() {
             return crate::ptr::null_mut();
         }
 
         // If boot services is valid then SystemTable is not null.
         let system_table = crate::os::uefi::env::system_table().as_ptr().cast();
+
+        // Each loaded image has an image handle that supports `EFI_LOADED_IMAGE_PROTOCOL`. Thus, this
+        // will never fail.
+        let mem_type = EFI_MEMORY_TYPE.get_or_init(|| {
+            let protocol = helpers::image_handle_protocol::<loaded_image::Protocol>(
+                loaded_image::PROTOCOL_GUID,
+            )
+            .unwrap();
+            // Gives allocations the memory type that the data sections were loaded as.
+            unsafe { (*protocol.as_ptr()).image_data_type }
+        });
+
         // The caller must ensure non-0 layout
-        unsafe { r_efi_alloc::raw::alloc(system_table, layout, MEMORY_TYPE) }
+        unsafe { r_efi_alloc::raw::alloc(system_table, layout, *mem_type) }
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {