From 75f21a5124cc4ed542c8faff64a36c68bb7fbe57 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Sun, 8 Nov 2026 04:34:02 +0800 Subject: [mubios] Create 16-bit entry points for IRQ0/IRQ1 and install the IVT vectors. Signed-off-by: Richard Qin --- mubios/arch/irq.S | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 mubios/arch/irq.S (limited to 'mubios/arch/irq.S') diff --git a/mubios/arch/irq.S b/mubios/arch/irq.S new file mode 100644 index 0000000..6eea350 --- /dev/null +++ b/mubios/arch/irq.S @@ -0,0 +1,51 @@ +# 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 irq0_entry + .type irq0_entry, @function + +irq0_entry: + push ax + + # Acknowledge IRQ0 on the master PIC. + mov al, 0x20 + out 0x20, al + + pop ax + iret + + .global irq1_entry + .type irq1_entry, @function + +irq1_entry: + push ax + + # Read the PS/2 scan code before sending EOI. + in al, 0x60 + + mov al, 0x20 + out 0x20, al + + pop ax + iret -- cgit v1.2.3