Added interrupt handling

1 files changed, 49 insertions, 0 deletions

diff --git a/src/loader/inc/int.h b/src/loader/inc/int.h
new file mode 100644
index 0000000..ccd9ea8
--- /dev/null
+++ b/src/loader/inc/int.h
@@ -0,0 +1,49 @@
+// MIT License, Copyright (c) 2021 Marvin Borner
+
+#ifndef INT_H
+#define INT_H
+
+#include <def.h>
+
+#define INT_GATE 0x8e
+#define INT_TRAP 0xef
+#define INT_USER 0x60
+#define IDT_ENTRY(offset, selector, type)                                                          \
+	(struct idt_entry)                                                                         \
+	{                                                                                          \
+		.base_low = (u16)((offset)&0xffff), .sel = (selector), .zero = 0, .flags = (type), \
+		.base_high = (u16)(((offset) >> 16) & 0xffff),                                     \
+	}
+
+struct int_frame {
+	u32 gs, fs, es, ds;
+	u32 edi, esi, ebp, esp, ebx, edx, ecx, eax;
+	u32 int_no, err_code;
+	u32 eip, cs, eflags;
+} PACKED;
+
+struct int_frame_user {
+	u32 gs, fs, es, ds;
+	u32 edi, esi, ebp, esp, ebx, edx, ecx, eax;
+	u32 int_no, err_code;
+	u32 eip, cs, eflags;
+	u32 useresp, ss;
+} PACKED;
+
+struct idt_entry {
+	u16 base_low;
+	u16 sel; // Kernel segment
+	u8 zero; // Always 0
+	u8 flags;
+	u16 base_high;
+} PACKED;
+
+struct idt_ptr {
+	u16 size;
+	void *base;
+} PACKED;
+
+void idt_install(void);
+void int_event_handler_add(u32 int_no, void (*handler)(void));
+
+#endif