From b1cf9e5dfbc8967bd7cb2a22ec1e5e521f4e0e6e Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Wed, 31 Jul 2024 13:36:53 -0400
Subject: add clock

---
 kernel/source/interrupts.asm | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

(limited to 'kernel/source/interrupts.asm')

diff --git a/kernel/source/interrupts.asm b/kernel/source/interrupts.asm
index e4912ee..df8e7ce 100644
--- a/kernel/source/interrupts.asm
+++ b/kernel/source/interrupts.asm
@@ -267,6 +267,22 @@ isr_end:
 
   ret
 
+extern on_rtc_interrupt
+
+rtc_isr:
+
+  call isr_start
+
+  call on_rtc_interrupt
+
+  mov al, 0x20
+  out 0x20, al
+  out 0xa0, al
+
+  call isr_end
+
+  iretq
+
 extern on_keyboard_interrupt
 
 keyboard_isr:
@@ -343,7 +359,7 @@ load_gdt_and_idt:
   out 0x21, al
   mov al, 0x01
   out 0x21, al
-  mov al, 0xf9 ;mask all but irq 1 and 2
+  mov al, 0xf9 ;mask all but irqs 1 and 2
   out 0x21, al
 
   mov al, 0x11
@@ -354,9 +370,15 @@ load_gdt_and_idt:
   out 0xa1, al
   mov al, 0x01
   out 0xa1, al
-  mov al, 0xef ;mask all but irq 12
+  mov al, 0xee ;mask all but irqs 8 and 12
   out 0xa1, al
 
+  ;register rtc interrupt
+
+  mov rdi, 0x28
+  mov rsi, rtc_isr
+  call set_isr
+
   ;register keyboard and mouse interrupts
 
   mov rdi, 0x21
-- 
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