Update todos

nucleus/src/arch/aarch64/memory/README.md

@@ -57,3 +57,7 @@ For more information please re-read.
 * resolve VA to PA - resolving lets kernel access mapped process memory.
   (start from the process' virtspace root - Page Directory)
 * flush page, pd, pt, virtspace - will be important for thread switching
+* map a page table to appropriate location
+* unmap entire mapped page table
+* map a phys frame to virt location
+* unmap a mapped frame

nucleus/src/arch/aarch64/memory/mod.rs

@@ -266,6 +266,7 @@ static KERNEL_VIRTUAL_LAYOUT: [Descriptor; 6] = [
             execute_never: true,
         },
     },
+    // @todo these should come from DTB and mem-map?
     Descriptor {
         name: "DMA heap pool",
         virtual_range: || RangeInclusive::new(map::virt::DMA_HEAP_START, map::virt::DMA_HEAP_END),
@@ -276,6 +277,7 @@ static KERNEL_VIRTUAL_LAYOUT: [Descriptor; 6] = [
             execute_never: true,
         },
     },
+    // @todo these should come from DTB and mem-map?
     Descriptor {
         name: "Device MMIO",
         virtual_range: || RangeInclusive::new(map::phys::VIDEOMEM_BASE, map::phys::MMIO_END),