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 ++++++++++++++++
 3 files changed, 40 insertions(+)
 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/cpu')

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
-- 
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