From a8852f91967a7e55e62e30f5cc07d076092b8b78 Mon Sep 17 00:00:00 2001
From: Fabian Imhof <fabian.imhof@ost.ch>
Date: Sat, 5 Apr 2025 15:27:20 +0000
Subject: add wip context switch to user mode

---
 arch/x86_64/include/arch/boot/pointers.hpp         |  5 ----
 .../include/arch/kernel/cpu/segment_register.hpp   | 23 ++++++++++++++++++
 arch/x86_64/include/arch/kernel/cpu/ss.hpp         | 27 ----------------------
 3 files changed, 23 insertions(+), 32 deletions(-)
 create mode 100644 arch/x86_64/include/arch/kernel/cpu/segment_register.hpp
 delete mode 100644 arch/x86_64/include/arch/kernel/cpu/ss.hpp

(limited to 'arch/x86_64/include')

diff --git a/arch/x86_64/include/arch/boot/pointers.hpp b/arch/x86_64/include/arch/boot/pointers.hpp
index 9bf5cfd..fe9c657 100644
--- a/arch/x86_64/include/arch/boot/pointers.hpp
+++ b/arch/x86_64/include/arch/boot/pointers.hpp
@@ -10,11 +10,6 @@ namespace teachos::arch::boot
    */
   extern "C" size_t const multiboot_information_pointer;
 
-  /**
-   * @brief Address pointing to the method that clears all segment registers.
-   */
-  extern "C" void reload_segment_register();
-
 }  // namespace teachos::arch::boot
 
 #endif  // TEACHOS_ARCH_X86_64_BOOT_POINTERS_HPP
diff --git a/arch/x86_64/include/arch/kernel/cpu/segment_register.hpp b/arch/x86_64/include/arch/kernel/cpu/segment_register.hpp
new file mode 100644
index 0000000..bd244fd
--- /dev/null
+++ b/arch/x86_64/include/arch/kernel/cpu/segment_register.hpp
@@ -0,0 +1,23 @@
+#ifndef TEACHOS_ARCH_X86_64_KERNEL_CPU_SEGMENT_REGISTER_HPP
+#define TEACHOS_ARCH_X86_64_KERNEL_CPU_SEGMENT_REGISTER_HPP
+
+#include "arch/context_switching/interrupt_descriptor_table/segment_selector.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+  /**
+   * @brief Clear all segment registers.
+   */
+  [[gnu::naked]]
+  auto reload_segment_registers() -> void;
+
+  /**
+   * @brief Set the value of all segment registers.
+   *
+   * @param segment_selector
+   */
+  auto set_segment_registers(context_switching::interrupt_descriptor_table::segment_selector segment_selector) -> void;
+
+}  // namespace teachos::arch::kernel::cpu
+
+#endif  // TEACHOS_ARCH_X86_64_KERNEL_CPU_SEGMENT_REGISTER_HPP
diff --git a/arch/x86_64/include/arch/kernel/cpu/ss.hpp b/arch/x86_64/include/arch/kernel/cpu/ss.hpp
deleted file mode 100644
index b5fa5e3..0000000
--- a/arch/x86_64/include/arch/kernel/cpu/ss.hpp
+++ /dev/null
@@ -1,27 +0,0 @@
-#ifndef TEACHOS_ARCH_X86_64_KERNEL_CPU_SS_HPP
-#define TEACHOS_ARCH_X86_64_KERNEL_CPU_SS_HPP
-
-#include "arch/context_switching/interrupt_descriptor_table/segment_selector.hpp"
-
-#include <bitset>
-#include <cstdint>
-
-namespace teachos::arch::kernel::cpu
-{
-  /**
-   * @brief Reads the current value of the stack segment (SS) register.
-   *
-   * @return The current SS register value.
-   */
-  auto read_ss() -> context_switching::interrupt_descriptor_table::segment_selector;
-
-  /**
-   * @brief Writes a new value to the stack segment (SS) register.
-   *
-   * @param selector The segment selector to be written to SS.
-   */
-  auto write_ss(context_switching::interrupt_descriptor_table::segment_selector selector) -> void;
-
-}  // namespace teachos::arch::kernel::cpu
-
-#endif  // TEACHOS_ARCH_X86_64_KERNEL_CPU_SS_HPP
-- 
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