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/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program 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 2 of the
* License, or any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <gpxe/io.h>
#include <pic8259.h>
/** @file
*
* Minimal support for the 8259 Programmable Interrupt Controller
*
*/
/**
* Send non-specific EOI(s)
*
* @v irq IRQ number
*
* This seems to be inherently unsafe.
*/
static inline void send_nonspecific_eoi ( unsigned int irq ) {
DBG ( "Sending non-specific EOI for IRQ %d\n", irq );
if ( irq >= IRQ_PIC_CUTOFF ) {
outb ( ICR_EOI_NON_SPECIFIC, PIC2_ICR );
}
outb ( ICR_EOI_NON_SPECIFIC, PIC1_ICR );
}
/**
* Send specific EOI(s)
*
* @v irq IRQ number
*/
static inline void send_specific_eoi ( unsigned int irq ) {
DBG ( "Sending specific EOI for IRQ %d\n", irq );
if ( irq >= IRQ_PIC_CUTOFF ) {
outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( CHAINED_IRQ ) ),
ICR_REG ( CHAINED_IRQ ) );
}
outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( irq ) ), ICR_REG ( irq ) );
}
/**
* Send End-Of-Interrupt to the PIC
*
* @v irq IRQ number
*/
void send_eoi ( unsigned int irq ) {
send_specific_eoi ( irq );
}
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