Add root allocator

Author: Filip Chovanec

kernel/src/memman/mall.rs

@@ -0,0 +1,24 @@
+use core::alloc::GlobalAlloc;
+extern crate alloc;
+
+type MainAllocator = RootAllocator;
+
+#[global_allocator]
+static GLOBAL_ALLOC: MainAllocator = MainAllocator::new();
+
+struct RootAllocator {}
+
+impl RootAllocator {
+    const fn new() -> Self {
+        Self {}
+    }
+}
+
+unsafe impl GlobalAlloc for RootAllocator {
+    unsafe fn alloc(&self, layout: core::alloc::Layout) -> *mut u8 {
+        super::staticalloc::GLOBAL_STATIC_ALLOCATOR.alloc(layout)
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: core::alloc::Layout) {
+        super::staticalloc::GLOBAL_STATIC_ALLOCATOR.dealloc(ptr, layout);
+    }
+}

kernel/src/memman/mod.rs

@@ -4,5 +4,6 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
+pub mod mall;
 pub mod map;
 pub mod staticalloc;

kernel/src/memman/staticalloc.rs

@@ -4,10 +4,9 @@ extern crate alloc;
 
 const MAX: usize = crate::config::STATIC_ALLOCATOR_SIZE_BYTES;
 
-#[global_allocator]
-static GLOBAL_STATIC_ALLOCATOR: StaticAllocator<MAX> = StaticAllocator::new();
+pub static GLOBAL_STATIC_ALLOCATOR: StaticAllocator<MAX> = StaticAllocator::new();
 
-struct StaticAllocator<const SIZE: usize> {
+pub struct StaticAllocator<const SIZE: usize> {
     buffer: [u8; SIZE],
     bump_addr: spin::Mutex<usize>,
     refcount: spin::Mutex<usize>,