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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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