wip allocating heap memory in user mode

1 files changed, 12 insertions, 6 deletions

diff --git a/arch/x86_64/src/memory/main.cpp b/arch/x86_64/src/memory/main.cpp
index 558fbce..4cdfa80 100644
--- a/arch/x86_64/src/memory/main.cpp
+++ b/arch/x86_64/src/memory/main.cpp
@@ -20,18 +20,23 @@ namespace teachos::arch::memory
     }
 
     template<allocator::FrameAllocator T>
-    auto remap_heap(T & allocator, paging::active_page_table & active_table) -> void
+    auto remap_heap(T & allocator, paging::active_page_table & active_table, bool is_user_heap = false) -> void
     {
-      auto const start_page = paging::virtual_page::containing_address(heap::KERNEL_HEAP_START);
-      auto const end_page =
-          ++(paging::virtual_page::containing_address(heap::KERNEL_HEAP_START + heap::KERNEL_HEAP_SIZE - 1));
+      auto const heap_start = is_user_heap ? heap::USER_HEAP_START : heap::KERNEL_HEAP_START;
+      auto const heap_size = is_user_heap ? heap::USER_HEAP_SIZE : heap::KERNEL_HEAP_SIZE;
+
+      auto const start_page = paging::virtual_page::containing_address(heap_start);
+      auto const end_page = ++(paging::virtual_page::containing_address(heap_start + heap_size - 1));
       paging::page_container::iterator const begin{start_page};
       paging::page_container::iterator const end{end_page};
       paging::page_container const pages{begin, end};
 
+      constexpr auto base_flags = paging::entry::WRITABLE;
+      auto const flags = is_user_heap ? base_flags | paging::entry::USER_ACCESSIBLE : base_flags;
+
       for (auto const & page : pages)
       {
-        active_table.map_page_to_next_free_frame(allocator, page, paging::entry::WRITABLE);
+        active_table.map_page_to_next_free_frame(allocator, page, flags);
       }
     }
   }  // namespace
@@ -54,7 +59,8 @@ namespace teachos::arch::memory
     video::vga::text::write("Kernel remapping successful", video::vga::text::common_attributes::green_on_black);
     video::vga::text::newline();
 
-    remap_heap(allocator, active_table);
+    remap_heap(allocator, active_table);        // Remap kernel heap
+    remap_heap(allocator, active_table, true);  // Remap user heap
     video::vga::text::write("Heap remapping successful", video::vga::text::common_attributes::green_on_black);
     video::vga::text::newline();
   }