diff options
Diffstat (limited to 'i386/pc/i16/i16_pic.c')
| -rw-r--r-- | i386/pc/i16/i16_pic.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/i386/pc/i16/i16_pic.c b/i386/pc/i16/i16_pic.c new file mode 100644 index 00000000..3ff26973 --- /dev/null +++ b/i386/pc/i16/i16_pic.c @@ -0,0 +1,66 @@ +/* + * Copyright (c) 1995 The University of Utah and + * the Computer Systems Laboratory at the University of Utah (CSL). + * All rights reserved. + * + * Permission to use, copy, modify and distribute this software is hereby + * granted provided that (1) source code retains these copyright, permission, + * and disclaimer notices, and (2) redistributions including binaries + * reproduce the notices in supporting documentation, and (3) all advertising + * materials mentioning features or use of this software display the following + * acknowledgement: ``This product includes software developed by the + * Computer Systems Laboratory at the University of Utah.'' + * + * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS + * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF + * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * CSL requests users of this software to return to csl-dist@cs.utah.edu any + * improvements that they make and grant CSL redistribution rights. + * + * Author: Bryan Ford, University of Utah CSL + */ + +#include <mach/machine/pio.h> + +#include "pic.h" +#include "i16.h" + +CODE16 + +/* Program the PICs to use a different set of interrupt vectors. + Assumes processor I flag is off. */ +void i16_pic_set_master(int base) +{ + unsigned char old_mask; + + /* Save the original interrupt mask. */ + old_mask = inb(MASTER_OCW); PIC_DELAY(); + + /* Initialize the master PIC. */ + outb(MASTER_ICW, PICM_ICW1); PIC_DELAY(); + outb(MASTER_OCW, base); PIC_DELAY(); + outb(MASTER_OCW, PICM_ICW3); PIC_DELAY(); + outb(MASTER_OCW, PICM_ICW4); PIC_DELAY(); + + /* Restore the original interrupt mask. */ + outb(MASTER_OCW, old_mask); PIC_DELAY(); +} + +void i16_pic_set_slave(int base) +{ + unsigned char old_mask; + + /* Save the original interrupt mask. */ + old_mask = inb(SLAVES_OCW); PIC_DELAY(); + + /* Initialize the slave PIC. */ + outb(SLAVES_ICW, PICS_ICW1); PIC_DELAY(); + outb(SLAVES_OCW, base); PIC_DELAY(); + outb(SLAVES_OCW, PICS_ICW3); PIC_DELAY(); + outb(SLAVES_OCW, PICS_ICW4); PIC_DELAY(); + + /* Restore the original interrupt mask. */ + outb(SLAVES_OCW, old_mask); PIC_DELAY(); +} + |