80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* Copyright (C) 2004 The KOS Team
|
|
|
|
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 (at your option) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
USA.
|
|
*/
|
|
#include "ioports.h"
|
|
|
|
#include "i8259.h"
|
|
|
|
#define PIC_MASTER 0x20
|
|
#define PIC_SLAVE 0xa0
|
|
|
|
/** Setup the 8259 PIC */
|
|
sos_ret_t sos_i8259_subsystem_setup(void)
|
|
{
|
|
/* Send ICW1: 8086 mode + NOT Single ctrl + call address
|
|
interval=8 */
|
|
outb(0x11, PIC_MASTER);
|
|
outb(0x11, PIC_SLAVE);
|
|
|
|
/* Send ICW2: ctrl base address */
|
|
outb(0x20, PIC_MASTER+1);
|
|
outb(0x28, PIC_SLAVE+1);
|
|
|
|
/* Send ICW3 master: mask where slaves are connected */
|
|
outb(0x4, PIC_MASTER+1);
|
|
/* Send ICW3 slave: index where the slave is connected on master */
|
|
outb(0x2, PIC_SLAVE+1);
|
|
|
|
/* Send ICW4: 8086 mode, fully nested, not buffered, no implicit EOI */
|
|
outb(0x1, PIC_MASTER+1);
|
|
outb(0x1, PIC_SLAVE+1);
|
|
|
|
/* Send OCW1:
|
|
* Closing all IRQs : waiting for a correct handler The only IRQ
|
|
* enabled is the cascade (that's why we use 0xFB for the master) */
|
|
outb(0xFB, PIC_MASTER+1);
|
|
outb(0xFF, PIC_SLAVE+1);
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_i8259_enable_irq_line(int numirq)
|
|
{
|
|
if(numirq < 8)
|
|
/* irq on master PIC */
|
|
outb((inb(PIC_MASTER+1) & ~(1 << numirq)), PIC_MASTER+1);
|
|
else
|
|
/* irq on slave PIC */
|
|
outb((inb(PIC_SLAVE+1) & ~(1 << (numirq-8))), PIC_SLAVE+1);
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_i8259_disable_irq_line(int numirq)
|
|
{
|
|
if(numirq < 8)
|
|
/* irq on master PIC */
|
|
outb((inb(PIC_MASTER+1) | (1 << numirq)), PIC_MASTER+1);
|
|
else
|
|
/* irq on slave PIC */
|
|
outb((inb(PIC_SLAVE+1) | (1 << (numirq-8))), PIC_SLAVE+1);
|
|
|
|
return SOS_OK;
|
|
}
|