libsupport_zynq/ram: allow single allocator.

libsupport_zynq/src/ram.rs

@@ -1,30 +1,33 @@
 use alloc::alloc::Layout;
 use core::alloc::GlobalAlloc;
-use core::cell::UnsafeCell;
 use core::ptr::NonNull;
-use libboard_zynq::ddr::DdrRam;
-use libcortex_a9::regs::MPIDR;
+use libcortex_a9::{
+    mutex::Mutex,
+    regs::MPIDR
+};
 use libregister::RegisterR;
 use linked_list_allocator::Heap;
+#[cfg(not(feature = "alloc_core"))]
+use libboard_zynq::ddr::DdrRam;
 
 #[global_allocator]
-static mut ALLOCATOR: CortexA9Alloc = CortexA9Alloc(
-    UnsafeCell::new(Heap::empty()),
-    UnsafeCell::new(Heap::empty()),
+static ALLOCATOR: CortexA9Alloc = CortexA9Alloc(
+    Mutex::new(Heap::empty()),
+    Mutex::new(Heap::empty()),
 );
 
-struct CortexA9Alloc(UnsafeCell<Heap>, UnsafeCell<Heap>);
+struct CortexA9Alloc(Mutex<Heap>, Mutex<Heap>);
 
 unsafe impl Sync for CortexA9Alloc {}
 
 unsafe impl GlobalAlloc for CortexA9Alloc {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
         if cfg!(not(feature = "alloc_core")) || MPIDR.read().cpu_id() == 0 {
-            self.0.get().as_mut()
+            &self.0
         } else {
-            self.1.get().as_mut()
+            &self.1
         }
-        .unwrap()
+        .lock()
         .allocate_first_fit(layout)
         .ok()
         .map_or(0 as *mut u8, |allocation| allocation.as_ptr())
@@ -32,11 +35,11 @@ unsafe impl GlobalAlloc for CortexA9Alloc {
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
         if cfg!(not(feature = "alloc_core")) || MPIDR.read().cpu_id() == 0 {
-            self.0.get().as_mut()
+            &self.0
         } else {
-            self.1.get().as_mut()
+            &self.1
         }
-        .unwrap()
+        .lock()
         .deallocate(NonNull::new_unchecked(ptr), layout)
     }
 }
@@ -46,27 +49,25 @@ pub fn init_alloc_ddr(ddr: &mut DdrRam) {
     unsafe {
         ALLOCATOR
             .0
-            .get()
-            .as_mut()
-            .unwrap()
+            .lock()
             .init(ddr.ptr::<u8>() as usize, ddr.size());
     }
 }
 
-#[cfg(feature = "alloc_core")]
 extern "C" {
     static __heap0_start: usize;
     static __heap0_end: usize;
+    #[cfg(feature = "alloc_core")]
     static __heap1_start: usize;
+    #[cfg(feature = "alloc_core")]
     static __heap1_end: usize;
 }
 
-#[cfg(feature = "alloc_core")]
 pub fn init_alloc_core0() {
     unsafe {
         let start = &__heap0_start as *const usize as usize;
         let end = &__heap0_end as *const usize as usize;
-        ALLOCATOR.0.get().as_mut().unwrap().init(start, end - start);
+        ALLOCATOR.0.lock().init(start, end - start);
     }
 }
 
@@ -75,26 +76,22 @@ pub fn init_alloc_core1() {
     unsafe {
         let start = &__heap1_start as *const usize as usize;
         let end = &__heap1_end as *const usize as usize;
-        ALLOCATOR.1.get().as_mut().unwrap().init(start, end - start);
+        ALLOCATOR.1.lock().init(start, end - start);
     }
 }
 
 #[alloc_error_handler]
 fn alloc_error(layout: core::alloc::Layout) -> ! {
     let id = MPIDR.read().cpu_id();
-    let heap = unsafe {
-        if cfg!(not(feature = "alloc_core")) || id == 0 {
-            ALLOCATOR.0.get()
+    let used = if cfg!(not(feature = "alloc_core")) || id == 0 {
+        ALLOCATOR.0.lock().used()
     } else {
-            ALLOCATOR.1.get()
-        }
-        .as_mut()
-        .unwrap()
+        ALLOCATOR.1.lock().used()
     };
     panic!(
         "Core {} alloc_error, layout: {:?}, used memory: {}",
         id,
         layout,
-        heap.used()
+        used
     );
 }