From b6ee8bec7ed23fd0c544f67f735e96b2bfe67682 Mon Sep 17 00:00:00 2001
From: Fabian Imhof <fabian.imhof@ost.ch>
Date: Thu, 20 Mar 2025 15:30:18 +0000
Subject: begin implementation of IDT

---
 arch/x86_64/src/kernel/cpu/idtr.cpp | 19 +++++++++++++++++++
 arch/x86_64/src/kernel/cpu/if.cpp   |  5 +++++
 arch/x86_64/src/kernel/cpu/jmp.cpp  | 16 ++++++++++++++++
 arch/x86_64/src/kernel/main.cpp     | 10 ++++++----
 4 files changed, 46 insertions(+), 4 deletions(-)
 create mode 100644 arch/x86_64/src/kernel/cpu/idtr.cpp
 create mode 100644 arch/x86_64/src/kernel/cpu/if.cpp
 create mode 100644 arch/x86_64/src/kernel/cpu/jmp.cpp

(limited to 'arch/x86_64/src/kernel')

diff --git a/arch/x86_64/src/kernel/cpu/idtr.cpp b/arch/x86_64/src/kernel/cpu/idtr.cpp
new file mode 100644
index 0000000..bbf34cb
--- /dev/null
+++ b/arch/x86_64/src/kernel/cpu/idtr.cpp
@@ -0,0 +1,19 @@
+#include "arch/kernel/cpu/idtr.hpp"
+
+#include "arch/context_switching/descriptor_table/interrupt_descriptor_table_pointer.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+  auto store_global_descriptor_table() -> context_switching::descriptor_table::global_descriptor_table_pointer
+  {
+    context_switching::descriptor_table::interrupt_descriptor_table_pointer current_value{};
+    asm("sidt %[output]" : [output] "=m"(current_value));
+    return current_value;
+  }
+
+  auto load_interrupt_descriptor_table(
+      context_switching::descriptor_table::interrupt_descriptor_table_pointer const & idt_pointer) -> void
+  {
+    asm volatile("lidt %[input]" : /* no output from call */ : [input] "m"(idt_pointer));
+  }
+}  // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/src/kernel/cpu/if.cpp b/arch/x86_64/src/kernel/cpu/if.cpp
new file mode 100644
index 0000000..2a25df5
--- /dev/null
+++ b/arch/x86_64/src/kernel/cpu/if.cpp
@@ -0,0 +1,5 @@
+namespace teachos::arch::kernel::cpu
+{
+  auto set_interrupt_flag() -> void { asm volatile("sti"); }
+
+}  // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/src/kernel/cpu/jmp.cpp b/arch/x86_64/src/kernel/cpu/jmp.cpp
new file mode 100644
index 0000000..009981b
--- /dev/null
+++ b/arch/x86_64/src/kernel/cpu/jmp.cpp
@@ -0,0 +1,16 @@
+#include "arch/kernel/cpu/jmp.hpp"
+
+namespace teachos::arch::kernel::cpu
+{
+  auto jmp(uint64_t address) -> void
+  {
+    asm volatile("jmp *%[input]" : /* no output from call */ : [input] "r"(address));
+  }
+
+  auto jmp(uint64_t segment, uint64_t offset) -> void
+  {
+    far_pointer far_pointer = {offset, static_cast<uint16_t>(segment)};
+    asm volatile("jmp *%0" : : "m"(far_pointer));
+  }
+
+}  // namespace teachos::arch::kernel::cpu
diff --git a/arch/x86_64/src/kernel/main.cpp b/arch/x86_64/src/kernel/main.cpp
index da6d6d3..9433558 100644
--- a/arch/x86_64/src/kernel/main.cpp
+++ b/arch/x86_64/src/kernel/main.cpp
@@ -1,6 +1,9 @@
 #include "arch/kernel/main.hpp"
 
-#include "arch/context_switching/descriptor_table/global_descriptor_table.hpp"
+#include "arch/boot/pointers.hpp"
+#include "arch/context_switching/descriptor_table/initialization.hpp"
+#include "arch/kernel/cpu/if.hpp"
+#include "arch/kernel/cpu/jmp.hpp"
 #include "arch/memory/heap/bump_allocator.hpp"
 #include "arch/memory/heap/global_heap_allocator.hpp"
 #include "arch/memory/main.hpp"
@@ -60,8 +63,7 @@ namespace teachos::arch::kernel
 
     heap_test();
 
-    decltype(auto) global_descriptor_table = context_switching::descriptor_table::initialize_global_descriptor_table();
-    (void)global_descriptor_table.at(1);
-    video::vga::text::write("GDT FILLED", video::vga::text::common_attributes::green_on_black);
+    decltype(auto) descriptor_tables = context_switching::descriptor_table::initialize_descriptor_tables();
+    (void)descriptor_tables;
   }
 }  // namespace teachos::arch::kernel
-- 
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