From bf60a63b35f4edce8474746fad18fa1a57ec1837 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Sun, 8 Nov 2026 06:28:53 +0800 Subject: [mubios] Have IRQ0 maintain the BIOS clock, and implement INT 1Ah AH=00h. Signed-off-by: Richard Qin --- mubios/arch/interrupt.S | 50 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 mubios/arch/interrupt.S (limited to 'mubios/arch/interrupt.S') diff --git a/mubios/arch/interrupt.S b/mubios/arch/interrupt.S new file mode 100644 index 0000000..7cb3f4b --- /dev/null +++ b/mubios/arch/interrupt.S @@ -0,0 +1,50 @@ +# RCC-Project +# +# Copyright (C) 2026 Richard Qin +# +# This file is part of RCC-Project. +# +# RCC-Project is free software; you can redistribute it and/or modify it under +# the terms of the GNU General Public License as published by the Free +# Software Foundation; either version 3 of the License, or (at your option) any +# later version. +# +# RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY +# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR +# A PARTICULAR PURPOSE. See the GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along with +# RCC-Project; see the file COPYING. If not see +# . + + .intel_syntax noprefix + .code16 + + .section .text16.irq, "ax" + + .global int1a_entry + .type int1a_entry, @function + +int1a_entry: + cmp ah, 0x00 + jne int1a_return + + push ds + push bx + + xor bx, bx + mov ds, bx + + mov bx, 0x046C + mov cx, word ptr [bx + 2] + mov dx, word ptr [bx] + + mov al, byte ptr [0x0470] + mov byte ptr [0x0470], 0 + mov ah, 0x00 + + pop bx + pop ds + +int1a_return: + iret -- cgit v1.2.3