From 32add45849744dc976c7af6ec24f985bbace47d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matteo=20Gm=C3=BCr?= <matteo.gmuer1@ost.ch>
Date: Wed, 2 Oct 2024 13:02:35 +0000
Subject: Creating base frame allocation code

---
 arch/x86_64/include/arch/kernel/main.hpp           |  2 -
 .../x86_64/include/arch/memory/frame_allocator.hpp | 48 ++++++++++++++++++++++
 arch/x86_64/src/kernel/main.cpp                    |  6 +++
 arch/x86_64/src/memory/frame_allocator.cpp         |  9 ++++
 4 files changed, 63 insertions(+), 2 deletions(-)
 create mode 100644 arch/x86_64/include/arch/memory/frame_allocator.hpp
 create mode 100644 arch/x86_64/src/memory/frame_allocator.cpp

(limited to 'arch')

diff --git a/arch/x86_64/include/arch/kernel/main.hpp b/arch/x86_64/include/arch/kernel/main.hpp
index 6759eb2..8813b46 100644
--- a/arch/x86_64/include/arch/kernel/main.hpp
+++ b/arch/x86_64/include/arch/kernel/main.hpp
@@ -1,8 +1,6 @@
 #ifndef TEACHOS_ARCH_X86_64_KERNEL_MAIN_HPP
 #define TEACHOS_ARCH_X86_64_KERNEL_MAIN_HPP
 
-#include <cstddef>
-
 namespace teachos::arch::kernel
 {
   auto main() -> void;
diff --git a/arch/x86_64/include/arch/memory/frame_allocator.hpp b/arch/x86_64/include/arch/memory/frame_allocator.hpp
new file mode 100644
index 0000000..bcb0882
--- /dev/null
+++ b/arch/x86_64/include/arch/memory/frame_allocator.hpp
@@ -0,0 +1,48 @@
+#ifndef TEACHOS_ARCH_X86_64_MEMORY_FRAME_HPP
+#define TEACHOS_ARCH_X86_64_MEMORY_FRAME_HPP
+
+#include <cstddef>
+#include <optional>
+
+namespace teachos::arch::memory
+{
+  namespace
+  {
+    const size_t PAGE_FRAME_SIZE = 4096U;
+  }
+
+  struct Frame
+  {
+    size_t frame_number;
+
+    Frame(size_t frame_number)
+        : frame_number(frame_number)
+    {
+      // Nothing to do
+    }
+
+    auto containing_address(size_t address) -> Frame { return Frame{address / PAGE_FRAME_SIZE}; }
+  };
+
+  struct IFrameAllocator
+  {
+    virtual auto allocate_frame() -> std::optional<Frame> = 0;
+    virtual auto deallocate_frame(Frame frame) -> void = 0;
+  };
+
+  struct AreaFrameAllocator : public IFrameAllocator
+  {
+    Frame next_free_frame;
+    // std::optional<MemoryArea> current_area;
+    // MemoryArea * areas;
+    Frame kernel_start;
+    Frame kernel_end;
+    Frame multiboot_start;
+    Frame multiboot_end;
+
+    auto allocate_frame() -> std::optional<Frame> override;
+    auto deallocate_frame(Frame frame) -> void override;
+  };
+}  // namespace teachos::arch::memory
+
+#endif  // TEACHOS_ARCH_X86_64_MEMORY_FRAME_HPP
diff --git a/arch/x86_64/src/kernel/main.cpp b/arch/x86_64/src/kernel/main.cpp
index 4deac6d..da496a6 100644
--- a/arch/x86_64/src/kernel/main.cpp
+++ b/arch/x86_64/src/kernel/main.cpp
@@ -125,6 +125,12 @@ namespace teachos::arch::kernel
     multiboot_info * multiboot_information_pointer = (multiboot_info *)arch::boot::multiboot_information_pointer;
     auto multiboot_tag = &(multiboot_information_pointer->tags);
 
+    text::write("Multiboot Start: ", text::common_attributes::green_on_black);
+    text::write_number(arch::boot::multiboot_information_pointer, text::common_attributes::green_on_black);
+    text::write("Multiboot End: ", text::common_attributes::green_on_black);
+    text::write_number(arch::boot::multiboot_information_pointer + multiboot_information_pointer->total_size,
+                       text::common_attributes::green_on_black);
+
     /*
      * Loop over the multiboot2 tags to access the information needed.
      * Tags are defined in the header file and are padded so that each
diff --git a/arch/x86_64/src/memory/frame_allocator.cpp b/arch/x86_64/src/memory/frame_allocator.cpp
new file mode 100644
index 0000000..425528a
--- /dev/null
+++ b/arch/x86_64/src/memory/frame_allocator.cpp
@@ -0,0 +1,9 @@
+#include "arch/memory/frame_allocator.hpp"
+
+namespace teachos::arch::memory
+{
+  auto AreaFrameAllocator::allocate_frame() -> std::optional<Frame> {}
+
+  auto AreaFrameAllocator::deallocate_frame(Frame frame) -> void {}
+
+}  // namespace teachos::arch::memory
-- 
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