From ec572bff8150e2f8cd2dc99e053c5e8c8a0b99e3 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 14 Jul 2025 16:25:00 +0000
Subject: arch: prepare interfaces

---
 arch/x86_64/src/boot/boot.s |  2 +-
 arch/x86_64/src/io.cpp      | 22 ++++++++++++++++
 arch/x86_64/src/memory.cpp  | 62 +++++++++++++++++++++++++++++++++++++++++++++
 arch/x86_64/src/system.cpp  | 12 +++++++++
 4 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86_64/src/io.cpp
 create mode 100644 arch/x86_64/src/memory.cpp
 create mode 100644 arch/x86_64/src/system.cpp

(limited to 'arch/x86_64/src')

diff --git a/arch/x86_64/src/boot/boot.s b/arch/x86_64/src/boot/boot.s
index 7932045..5488073 100644
--- a/arch/x86_64/src/boot/boot.s
+++ b/arch/x86_64/src/boot/boot.s
@@ -364,5 +364,5 @@ _transition_to_long_mode:
 
     call _init
 
-    call kernel_main
+    call main
     call halt
diff --git a/arch/x86_64/src/io.cpp b/arch/x86_64/src/io.cpp
new file mode 100644
index 0000000..8808dbb
--- /dev/null
+++ b/arch/x86_64/src/io.cpp
@@ -0,0 +1,22 @@
+namespace teachos::arch::io
+{
+
+  // using x86_64::vga::text_mode::attributes;
+  // using x86_64::vga::text_mode::color;
+
+  // namespace
+  // {
+  //   auto constexpr error_attributes =
+  //       attributes{.foreground = color::light_gray, .bright = true, .background = color::red, .blink = true};
+  // }  // namespace
+
+  auto init() -> void
+  {
+    // kernel::set_print_handler([](auto text) { return x86_64::vga::text_mode::print(text); });
+    // kernel::set_println_handler([](auto text) { return x86_64::vga::text_mode::println(text); });
+    // kernel::set_print_error_handler([](auto text) { return x86_64::vga::text_mode::print(text, error_attributes); });
+    // kernel::set_println_error_handler(
+    //     [](auto text) { return x86_64::vga::text_mode::println(text, error_attributes); });
+  }
+
+}  // namespace teachos::arch::io
diff --git a/arch/x86_64/src/memory.cpp b/arch/x86_64/src/memory.cpp
new file mode 100644
index 0000000..245d7bd
--- /dev/null
+++ b/arch/x86_64/src/memory.cpp
@@ -0,0 +1,62 @@
+#include "arch/memory.hpp"
+
+// #include "noarch/error.hpp"
+// #include "noarch/print.hpp"
+// #include "x86_64/bootstrap/mutiboot.hpp"
+// #include "x86_64/memory/frame_allocator.hpp"
+// #include "x86_64/memory/mbi_frame_allocator.hpp"
+
+// #include <elf/constants.hpp>
+// #include <elf/section_header.hpp>
+// #include <elf/section_header_table.hpp>
+// #include <multiboot2/information.hpp>
+
+namespace teachos::arch::memory
+{
+
+  // namespace
+  // {
+  //   /**
+  //    * @brief Remap the kernel according to the ELF information.
+  //    *
+  //    * After initial bootup, a basic identity mapping of the lower 1GiB is set up. This mapping allows execution
+  //    from,
+  //    * as well as read and write access to, the mapped memory. In order to protect the kernel, remap it according to
+  //    the
+  //    * information supplied by the ELF file. This means remapping code sections as read-only and data sections as
+  //    * no-execute (and read only for .rodata).
+  //    *
+  //    * @param sections Information about the sections in the loaded kernel binary.
+  //    * @param allocator The frame allocator used to create new page mappings.
+  //    */
+  //   auto remap_kernel(elf::section_header_table const & sections, x86_64::memory::frame_allocator & allocator) ->
+  //   void
+  //   {
+  //     static_cast<void>(sections);
+  //     static_cast<void>(allocator);
+  //   }
+  // }  // namespace
+
+  auto init() -> void
+  {
+    // kernel::println("Initializing memory");
+
+    // if (!x86_64::bootstrap::multiboot_information_pointer->has<multiboot2::memory_map>())
+    // {
+    //   kernel::panic("Received no memory map from the boot loader!");
+    // }
+
+    // if (!x86_64::bootstrap::multiboot_information_pointer->has<multiboot2::elf_symbols>())
+    // {
+    //   kernel::panic("Received no ELF symbol information from the boot loader!");
+    // }
+
+    // auto memory_map = x86_64::bootstrap::multiboot_information_pointer->memory_map();
+    // auto elf_symbols = x86_64::bootstrap::multiboot_information_pointer->elf_symbols();
+    // auto section_header_table = elf::section_header_table{elf_symbols.data(), elf::file_class::bits_64};
+    // auto allocator = x86_64::memory::mbi_frame_allocator{memory_map, section_header_table};
+
+    // remap_kernel(section_header_table, allocator);
+  }
+
+}  // namespace teachos::arch::memory
diff --git a/arch/x86_64/src/system.cpp b/arch/x86_64/src/system.cpp
new file mode 100644
index 0000000..60ebf0e
--- /dev/null
+++ b/arch/x86_64/src/system.cpp
@@ -0,0 +1,12 @@
+#include "arch/system.hpp"
+
+namespace teachos::arch::system
+{
+
+  auto halt() -> void
+  {
+    asm volatile("1: hlt\njmp 1b");
+    __builtin_unreachable();
+  }
+
+}  // namespace teachos::arch::system
-- 
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