2 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 FILE_LICENCE ( GPL2_OR_LATER );
27 * Minimal support for the 8259 Programmable Interrupt Controller
32 * Send non-specific EOI(s)
36 * This seems to be inherently unsafe.
38 static inline void send_nonspecific_eoi ( unsigned int irq ) {
39 DBG ( "Sending non-specific EOI for IRQ %d\n", irq );
40 if ( irq >= IRQ_PIC_CUTOFF ) {
41 outb ( ICR_EOI_NON_SPECIFIC, PIC2_ICR );
43 outb ( ICR_EOI_NON_SPECIFIC, PIC1_ICR );
47 * Send specific EOI(s)
51 static inline void send_specific_eoi ( unsigned int irq ) {
52 DBG ( "Sending specific EOI for IRQ %d\n", irq );
53 if ( irq >= IRQ_PIC_CUTOFF ) {
54 outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( CHAINED_IRQ ) ),
55 ICR_REG ( CHAINED_IRQ ) );
57 outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( irq ) ), ICR_REG ( irq ) );
61 * Send End-Of-Interrupt to the PIC
65 void send_eoi ( unsigned int irq ) {
66 send_specific_eoi ( irq );