build: Remove const_in_array_repeat_expressions

The `const_in_array_repeat_expressions` feature has been removed from
Rust [rust-lang/rust #80404](rust-lang/rust#80404).

Signed-off-by: Akira Moroo <retrage01@gmail.com>

Author: retrage

src/main.rs

@@ -13,7 +13,7 @@
 // limitations under the License.
 
 #![feature(alloc_error_handler)]
-#![feature(global_asm, const_in_array_repeat_expressions)]
+#![feature(global_asm)]
 #![cfg_attr(not(test), no_std)]
 #![cfg_attr(not(test), no_main)]
 #![cfg_attr(test, allow(unused_imports, dead_code))]

src/paging.rs

@@ -6,14 +6,15 @@ use x86_64::{
 
 // Amount of memory we identity map in setup(), max 512 GiB.
 const ADDRESS_SPACE_GIB: usize = 4;
+const TABLE: PageTable = PageTable::new();
 
 // Put the Page Tables in static muts to make linking easier
 #[no_mangle]
 static mut L4_TABLE: PageTable = PageTable::new();
 #[no_mangle]
 static mut L3_TABLE: PageTable = PageTable::new();
 #[no_mangle]
-static mut L2_TABLES: [PageTable; ADDRESS_SPACE_GIB] = [PageTable::new(); ADDRESS_SPACE_GIB];
+static mut L2_TABLES: [PageTable; ADDRESS_SPACE_GIB] = [TABLE; ADDRESS_SPACE_GIB];
 
 pub fn setup() {
     // SAFETY: This function is idempontent and only writes to static memory and