From 138424b31d9c2af158e8ae619248b035b5a280d9 Mon Sep 17 00:00:00 2001
From: Nic Gaffney <gaffney_nic@protonmail.com>
Date: Thu, 21 Dec 2023 03:32:06 -0600
Subject: set up bochs for debugging and started working on interrupts.

---
 src/include/asm.h | 15 +++++++++++++++
 src/include/gdt.h | 12 +++++++-----
 src/include/idt.h | 17 +++++++++++++++++
 3 files changed, 39 insertions(+), 5 deletions(-)
 create mode 100644 src/include/asm.h
 create mode 100644 src/include/idt.h

(limited to 'src/include')

diff --git a/src/include/asm.h b/src/include/asm.h
new file mode 100644
index 0000000..97ea45a
--- /dev/null
+++ b/src/include/asm.h
@@ -0,0 +1,15 @@
+#pragma once
+#include <stdint.h>
+
+// IO
+static inline void outb(uint16_t port, uint8_t val) {
+    asm volatile("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
+}
+
+static inline uint8_t inb(uint16_t port) {
+    uint8_t ret;
+    asm volatile("inb %1, %0" : "=a"(ret) : "Nd"(port) : "memory");
+    return ret;
+}
+
+static inline void io_wait(void) { outb(0x80, 0); }
diff --git a/src/include/gdt.h b/src/include/gdt.h
index 06a0d96..8cc2542 100644
--- a/src/include/gdt.h
+++ b/src/include/gdt.h
@@ -16,11 +16,13 @@ typedef struct GDTR {
     uint32_t offset;
 } __attribute__((packed)) GDTR_t;
 
-typedef struct GDT {
-    Segment_Descriptor_t nulldesc;
-    Segment_Descriptor_t codedesc;
-    Segment_Descriptor_t datadesc;
-} __attribute__((packed)) GDT_t;
+// typedef struct GDT {
+//     Segment_Descriptor_t nulldesc;
+//     Segment_Descriptor_t codedesc;
+//     Segment_Descriptor_t datadesc;
+// } __attribute__((packed)) GDT_t;
+
+typedef Segment_Descriptor_t *GDT_t;
 
 uint16_t make_code(uint8_t priv, uint8_t dc, uint8_t rw);
 uint16_t make_data(uint8_t priv, uint8_t dc, uint8_t rw);
diff --git a/src/include/idt.h b/src/include/idt.h
new file mode 100644
index 0000000..b8413b8
--- /dev/null
+++ b/src/include/idt.h
@@ -0,0 +1,17 @@
+#pragma once
+#include <stdint.h>
+
+typedef struct Gate_Descriptor {
+    uint16_t offset_low;
+    uint16_t segment_selector;
+    uint8_t reserved;
+    uint8_t attrs;
+    uint16_t offset_high;
+} __attribute__((packed)) Gate_Descriptor_t;
+
+typedef Gate_Descriptor_t *IDT_t;
+
+Gate_Descriptor_t make_gate(uint32_t offset, uint8_t segment_selector,
+                            uint8_t attrs);
+
+void get_idtr();
-- 
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