2005-03-08 19:53:11 +01:00
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/*
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2007-01-04 20:36:18 +01:00
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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2005-03-08 19:53:11 +01:00
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*
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2007-01-04 20:36:18 +01:00
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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2005-03-08 19:53:11 +01:00
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*
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2007-01-04 20:36:18 +01:00
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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2005-03-08 19:53:11 +01:00
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*
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2007-01-04 20:36:18 +01:00
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2005-03-08 19:53:11 +01:00
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*/
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2007-01-04 20:36:18 +01:00
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#include <pic8259.h>
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2005-03-08 19:53:11 +01:00
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2007-01-04 20:36:18 +01:00
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/** @file
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*
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* Minimal support for the 8259 Programmable Interrupt Controller
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2005-03-08 19:53:11 +01:00
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*
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*/
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2007-01-04 20:36:18 +01:00
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/**
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* Send non-specific EOI(s)
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*
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* @v irq IRQ number
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*
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* This seems to be inherently unsafe.
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2005-03-08 19:53:11 +01:00
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*/
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2007-01-04 20:36:18 +01:00
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static inline void send_nonspecific_eoi ( unsigned int irq ) {
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2005-03-08 19:53:11 +01:00
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DBG ( "Sending non-specific EOI for IRQ %d\n", irq );
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if ( irq >= IRQ_PIC_CUTOFF ) {
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outb ( ICR_EOI_NON_SPECIFIC, PIC2_ICR );
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}
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outb ( ICR_EOI_NON_SPECIFIC, PIC1_ICR );
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}
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2007-01-04 20:36:18 +01:00
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/**
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* Send specific EOI(s)
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*
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* @v irq IRQ number
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2005-03-08 19:53:11 +01:00
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*/
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2007-01-04 20:36:18 +01:00
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static inline void send_specific_eoi ( unsigned int irq ) {
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2005-03-08 19:53:11 +01:00
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DBG ( "Sending specific EOI for IRQ %d\n", irq );
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if ( irq >= IRQ_PIC_CUTOFF ) {
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2007-01-04 20:36:18 +01:00
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outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( CHAINED_IRQ ) ),
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ICR_REG ( CHAINED_IRQ ) );
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2005-03-08 19:53:11 +01:00
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}
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2007-07-10 05:33:59 +02:00
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outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( irq ) ), ICR_REG ( irq ) );
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2005-03-08 19:53:11 +01:00
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}
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2007-01-04 20:36:18 +01:00
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/**
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* Send End-Of-Interrupt to the PIC
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*
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* @v irq IRQ number
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2005-03-08 19:53:11 +01:00
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*/
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2007-01-04 20:36:18 +01:00
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void send_eoi ( unsigned int irq ) {
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send_specific_eoi ( irq );
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2005-03-08 19:53:11 +01:00
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}
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