From 975a9ec96e282e437ccc1bdf1e660dcbf4542791 Mon Sep 17 00:00:00 2001
From: EmulatedSeasons <89668582+EmulatedSeasons@users.noreply.github.com>
Date: Fri, 10 May 2024 01:44:59 -0400
Subject: Added GDT and basic IDT as well as a bitmap drawing function

---
 kernel/arch/x86_64/idt.cpp | 94 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 kernel/arch/x86_64/idt.cpp

(limited to 'kernel/arch/x86_64/idt.cpp')

diff --git a/kernel/arch/x86_64/idt.cpp b/kernel/arch/x86_64/idt.cpp
new file mode 100644
index 0000000..fe3f45f
--- /dev/null
+++ b/kernel/arch/x86_64/idt.cpp
@@ -0,0 +1,94 @@
+#include <stdint.h>
+#include "idt.h"
+
+extern "C" void isr0();
+extern "C" void isr1();
+extern "C" void isr2();
+extern "C" void isr3();
+extern "C" void isr4();
+extern "C" void isr5();
+extern "C" void isr6();
+extern "C" void isr7();
+extern "C" void isr8();
+extern "C" void isr9();
+extern "C" void isr10();
+extern "C" void isr11();
+extern "C" void isr12();
+extern "C" void isr13();
+extern "C" void isr14();
+extern "C" void isr15();
+extern "C" void isr16();
+extern "C" void isr17();
+extern "C" void isr18();
+extern "C" void isr19();
+extern "C" void isr20();
+extern "C" void isr21();
+extern "C" void isr22();
+extern "C" void isr23();
+extern "C" void isr24();
+extern "C" void isr25();
+extern "C" void isr26();
+extern "C" void isr27();
+extern "C" void isr28();
+extern "C" void isr29();
+extern "C" void isr30();
+extern "C" void isr31();
+
+IdtEntry idt[256];
+IDTR idtr;
+
+void idt_entry(int num, uint64_t offset, uint16_t sel, uint8_t ist, uint8_t type_attributes) {
+    idt[num].offset_low = (uint64_t)offset & 0xFFFF;
+    idt[num].offset_mid = ((uint64_t)offset & 0xFFFF0000) >> 16;
+    idt[num].offset_high = ((uint64_t)offset & 0xFFFFFFFF00000000) >> 32;
+
+    idt[num].seg_sel = sel;
+
+    idt[num].ist = ist & 0b111;
+
+    idt[num].type_attributes = type_attributes;
+
+    idt[num].reserved = 0;
+}
+
+extern "C" void load_idt(IDTR*);
+
+void setup_idt() {
+    idtr.size = (sizeof(struct IDTR) * 256);
+    idtr.offset = (uint64_t)idt;
+
+    idt_entry(0, (uint64_t)isr0, 0x08, 0, 0x8E);
+    idt_entry(1, (uint64_t)isr1, 0x08, 0, 0x8E);
+    idt_entry(2, (uint64_t)isr2, 0x08, 0, 0x8E);
+    idt_entry(3, (uint64_t)isr3, 0x08, 0, 0x8E);
+    idt_entry(4, (uint64_t)isr4, 0x08, 0, 0x8E);
+    idt_entry(5, (uint64_t)isr5, 0x08, 0, 0x8E);
+    idt_entry(6, (uint64_t)isr6, 0x08, 0, 0x8E);
+    idt_entry(7, (uint64_t)isr7, 0x08, 0, 0x8E);
+    idt_entry(8, (uint64_t)isr8, 0x08, 0, 0x8E);
+    idt_entry(9, (uint64_t)isr9, 0x08, 0, 0x8E);
+    idt_entry(10, (uint64_t)isr10, 0x08, 0, 0x8E);
+    idt_entry(11, (uint64_t)isr11, 0x08, 0, 0x8E);
+    idt_entry(12, (uint64_t)isr12, 0x08, 0, 0x8E);
+    idt_entry(13, (uint64_t)isr13, 0x08, 0, 0x8E);
+    idt_entry(14, (uint64_t)isr14, 0x08, 0, 0x8E);
+    idt_entry(15, (uint64_t)isr15, 0x08, 0, 0x8E);
+    idt_entry(16, (uint64_t)isr16, 0x08, 0, 0x8E);
+    idt_entry(17, (uint64_t)isr17, 0x08, 0, 0x8E);
+    idt_entry(18, (uint64_t)isr18, 0x08, 0, 0x8E);
+    idt_entry(19, (uint64_t)isr19, 0x08, 0, 0x8E);
+    idt_entry(20, (uint64_t)isr20, 0x08, 0, 0x8E);
+    idt_entry(21, (uint64_t)isr21, 0x08, 0, 0x8E);
+    idt_entry(22, (uint64_t)isr22, 0x08, 0, 0x8E);
+    idt_entry(23, (uint64_t)isr23, 0x08, 0, 0x8E);
+    idt_entry(24, (uint64_t)isr24, 0x08, 0, 0x8E);
+    idt_entry(25, (uint64_t)isr25, 0x08, 0, 0x8E);
+    idt_entry(26, (uint64_t)isr26, 0x08, 0, 0x8E);
+    idt_entry(27, (uint64_t)isr27, 0x08, 0, 0x8E);
+    idt_entry(28, (uint64_t)isr28, 0x08, 0, 0x8E);
+    idt_entry(29, (uint64_t)isr29, 0x08, 0, 0x8E);
+    idt_entry(30, (uint64_t)isr30, 0x08, 0, 0x8E);
+    idt_entry(31, (uint64_t)isr31, 0x08, 0, 0x8E);
+
+    load_idt(&idtr);
+}
\ No newline at end of file
-- 
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