kapi/memory: introduce layout constant header

5 files changed, 32 insertions, 3 deletions

diff --git a/kapi/include/kapi/memory.hpp b/kapi/include/kapi/memory.hpp
index 3a8f42d..b234cde 100644
--- a/kapi/include/kapi/memory.hpp
+++ b/kapi/include/kapi/memory.hpp
@@ -5,6 +5,7 @@
 #include "kapi/memory/chunk.hpp"            // IWYU pragma: export
 #include "kapi/memory/frame.hpp"            // IWYU pragma: export
 #include "kapi/memory/frame_allocator.hpp"  // IWYU pragma: export
+#include "kapi/memory/layout.hpp"           // IWYU pragma: export
 #include "kapi/memory/page.hpp"             // IWYU pragma: export
 #include "kapi/memory/page_mapper.hpp"      // IWYU pragma: export
 
diff --git a/kapi/include/kapi/memory/frame.hpp b/kapi/include/kapi/memory/frame.hpp
index deab300..a55b6ff 100644
--- a/kapi/include/kapi/memory/frame.hpp
+++ b/kapi/include/kapi/memory/frame.hpp
@@ -5,6 +5,7 @@
 
 #include "kapi/memory/address.hpp"
 #include "kapi/memory/chunk.hpp"
+#include "kapi/memory/layout.hpp"
 
 #include <cstddef>
 
@@ -15,7 +16,7 @@ namespace kapi::memory
   //! A handle to a frame of physical memory.
   //!
   //! @note Contrary to the address types, this type is modeled using inheritance to support future extensions.
-  struct frame : chunk<frame, physical_address, PLATFORM_FRAME_SIZE>
+  struct frame : chunk<frame, physical_address, frame_size>
   {
     frame() = default;
 
diff --git a/kapi/include/kapi/memory/layout.hpp b/kapi/include/kapi/memory/layout.hpp
new file mode 100644
index 0000000..f5ba0f9
--- /dev/null
+++ b/kapi/include/kapi/memory/layout.hpp
@@ -0,0 +1,26 @@
+#ifndef TEACHOS_KAPI_MEMORY_LAYOUT_HPP
+#define TEACHOS_KAPI_MEMORY_LAYOUT_HPP
+
+// IWYU pragma: private, include "kapi/memory.hpp"
+
+#include "kapi/memory/address.hpp"
+
+namespace kapi::memory
+{
+
+  constexpr auto page_size = PLATFORM_PAGE_SIZE;
+  constexpr auto frame_size = PLATFORM_FRAME_SIZE;
+
+  constexpr auto higher_half_direct_map_base = linear_address{0xffff'8000'0000'0000uz};
+
+  constexpr auto heap_base = linear_address{0xffff'c000'0000'0000uz};
+
+  constexpr auto pmm_metadata_base = linear_address{0xffff'd000'0000'0000uz};
+
+  constexpr auto mmio_base = linear_address{0xffff'e000'0000'0000uz};
+
+  constexpr auto kernel_base = linear_address{0xffff'ffff'8000'0000uz};
+
+}  // namespace kapi::memory
+
+#endif
\ No newline at end of file
diff --git a/kapi/include/kapi/memory/page.hpp b/kapi/include/kapi/memory/page.hpp
index f209278..3846bd8 100644
--- a/kapi/include/kapi/memory/page.hpp
+++ b/kapi/include/kapi/memory/page.hpp
@@ -5,6 +5,7 @@
 
 #include "kapi/memory/address.hpp"
 #include "kapi/memory/chunk.hpp"
+#include "kapi/memory/layout.hpp"
 
 #include <cstddef>
 
@@ -15,7 +16,7 @@ namespace kapi::memory
   //! A handle to a page of virtual memory.
   //!
   //! @note Contrary to the address types, this type is modeled using inheritance to support future extensions.
-  struct page : chunk<page, linear_address, PLATFORM_PAGE_SIZE>
+  struct page : chunk<page, linear_address, page_size>
   {
     page() = default;
 
diff --git a/kernel/kapi/memory.cpp b/kernel/kapi/memory.cpp
index 1699cd3..d657527 100644
--- a/kernel/kapi/memory.cpp
+++ b/kernel/kapi/memory.cpp
@@ -122,7 +122,7 @@ namespace kapi::memory
       system::panic("[OS:MEM] Not enough memory for bitmap allocator!");
     }
 
-    auto const base_address = 0xffff'c000'0000'0000uz;
+    auto const base_address = pmm_metadata_base.raw();
     auto const flags = page_mapper::flags::writable | page_mapper::flags::supervisor_only;
 
     std::ranges::for_each(std::views::iota(0uz, bitmap_pages), [&](auto index) {