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