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The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  The KOS Team
002    Copyright (C) 1999  Free Software Foundation, Inc.
003 
004    This program is free software; you can redistribute it and/or
005    modify it under the terms of the GNU General Public License
006    as published by the Free Software Foundation; either version 2
007    of the License, or (at your option) any later version.
008    
009    This program is distributed in the hope that it will be useful,
010    but WITHOUT ANY WARRANTY; without even the implied warranty of
011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012    GNU General Public License for more details.
013    
014    You should have received a copy of the GNU General Public License
015    along with this program; if not, write to the Free Software
016    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
017    USA. 
018 */
019 #include "ioports.h"
020 
021 #include "i8259.h"
022 
023 #define PIC_MASTER 0x20
024 #define PIC_SLAVE  0xa0
025 
026 /** Setup the 8259 PIC */
027 sos_ret_t sos_i8259_subsystem_setup(void)
028 {
029   /* Send ICW1: 8086 mode + NOT Single ctrl + call address
030      interval=8 */
031   outb(0x11, PIC_MASTER);
032   outb(0x11, PIC_SLAVE);
033 
034   /* Send ICW2: ctrl base address */
035   outb(0x20, PIC_MASTER+1);
036   outb(0x28, PIC_SLAVE+1);
037 
038   /* Send ICW3 master: mask where slaves are connected */
039   outb(0x4, PIC_MASTER+1);
040   /* Send ICW3 slave: index where the slave is connected on master */
041   outb(0x2, PIC_SLAVE+1);
042 
043   /* Send ICW4: 8086 mode, fully nested, not buffered, no implicit EOI */
044   outb(0x1, PIC_MASTER+1);
045   outb(0x1, PIC_SLAVE+1);
046 
047   /* Send OCW1:
048    * Closing all IRQs : waiting for a correct handler The only IRQ
049    * enabled is the cascade (that's why we use 0xFB for the master) */
050   outb(0xFB, PIC_MASTER+1);
051   outb(0xFF, PIC_SLAVE+1);
052 
053   return SOS_OK;
054 }
055 
056 
057 sos_ret_t sos_i8259_enable_irq_line(int numirq)
058 {
059   if(numirq < 8)
060     /*  irq on master PIC */
061     outb((inb(PIC_MASTER+1) & ~(1 << numirq)), PIC_MASTER+1);
062   else
063     /*  irq on slave PIC */
064     outb((inb(PIC_SLAVE+1) & ~(1 << (numirq-8))), PIC_SLAVE+1);
065   
066   return SOS_OK;
067 }
068 
069 
070 sos_ret_t sos_i8259_disable_irq_line(int numirq)
071 {
072   if(numirq < 8)
073     /*  irq on master PIC */
074     outb((inb(PIC_MASTER+1) | (1 << numirq)), PIC_MASTER+1);
075   else
076     /*  irq on slave PIC */
077     outb((inb(PIC_SLAVE+1) | (1 << (numirq-8))), PIC_SLAVE+1);
078 
079   return SOS_OK;
080 }

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