From de90b9cfd17b7a2e52aec22b4c0fffeb165e371f Mon Sep 17 00:00:00 2001
From: Ain <41307858+nero@users.noreply.github.com>
Date: Sun, 1 Sep 2019 14:05:40 +0000
Subject: [PATCH] Routine for loading far ptr from IVT

---
 kernel/intr.asm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/kernel/intr.asm b/kernel/intr.asm
index e08b764..2dbfa60 100644
--- a/kernel/intr.asm
+++ b/kernel/intr.asm
@@ -32,3 +32,29 @@ intr_register:
   pop es
   pop ax
   ret
+
+; Get address for a interrupt vector
+; in	AL	interrupt number
+; out	DS:SI	far ptr to routine/data
+intr_load:
+  push ax
+
+  ; SI = AL * 4
+  mov ah, 4
+  mul ah
+  mov si, ax
+
+  ; ES = 0
+  xor ax, ax
+  mov ds, ax
+
+  ; load offset
+  lodsw
+  mov si, ax
+
+  ; load segment
+  lodsw
+  mov ds, ax
+
+  pop ax
+  ret