Basic allocations in rust user-space.

rust/lib/mammoth/src/mem.rs

@@ -0,0 +1,31 @@
+use crate::syscall;
+use crate::SELF_VMAS_CAP;
+use linked_list_allocator::LockedHeap;
+
+#[global_allocator]
+static ALLOCATOR: LockedHeap = LockedHeap::empty();
+
+pub fn init_heap() {
+    // 1 MiB
+    let size = 0x10_0000;
+    let mut vmmo_cap = 0;
+    let obj_req = syscall::ZMemoryObjectCreateReq {
+        size,
+        vmmo_cap: &mut vmmo_cap as *mut u64,
+    };
+    syscall::checked_syscall(syscall::kZionMemoryObjectCreate, &obj_req);
+
+    unsafe {
+        let mut vaddr: u64 = 0;
+        let vmas_req = syscall::ZAddressSpaceMapReq {
+            vmmo_cap,
+            vmas_cap: SELF_VMAS_CAP,
+            align: 0x2000,
+            vaddr: &mut vaddr as *mut u64,
+            vmas_offset: 0,
+        };
+
+        syscall::checked_syscall(syscall::kZionAddressSpaceMap, &vmas_req);
+        ALLOCATOR.lock().init(vaddr as *mut u8, size as usize);
+    }
+}