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Annotation of Gnu-Mach/i386/pc/i16/i16_pic.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #include <mach/machine/pio.h>
        !            25: 
        !            26: #include "pic.h"
        !            27: #include "i16.h"
        !            28: 
        !            29: CODE16
        !            30: 
        !            31: /* Program the PICs to use a different set of interrupt vectors.
        !            32:    Assumes processor I flag is off.  */
        !            33: void i16_pic_set_master(int base)
        !            34: {
        !            35:        unsigned char old_mask;
        !            36: 
        !            37:        /* Save the original interrupt mask.  */
        !            38:        old_mask = inb(MASTER_OCW);     PIC_DELAY();
        !            39: 
        !            40:        /* Initialize the master PIC.  */
        !            41:        outb(MASTER_ICW, PICM_ICW1);    PIC_DELAY();
        !            42:        outb(MASTER_OCW, base);         PIC_DELAY();
        !            43:        outb(MASTER_OCW, PICM_ICW3);    PIC_DELAY();
        !            44:        outb(MASTER_OCW, PICM_ICW4);    PIC_DELAY();
        !            45: 
        !            46:        /* Restore the original interrupt mask.  */
        !            47:        outb(MASTER_OCW, old_mask);     PIC_DELAY();
        !            48: }
        !            49: 
        !            50: void i16_pic_set_slave(int base)
        !            51: {
        !            52:        unsigned char old_mask;
        !            53: 
        !            54:        /* Save the original interrupt mask.  */
        !            55:        old_mask = inb(SLAVES_OCW);     PIC_DELAY();
        !            56: 
        !            57:        /* Initialize the slave PIC.  */
        !            58:        outb(SLAVES_ICW, PICS_ICW1);    PIC_DELAY();
        !            59:        outb(SLAVES_OCW, base);         PIC_DELAY();
        !            60:        outb(SLAVES_OCW, PICS_ICW3);    PIC_DELAY();
        !            61:        outb(SLAVES_OCW, PICS_ICW4);    PIC_DELAY();
        !            62: 
        !            63:        /* Restore the original interrupt mask.  */
        !            64:        outb(SLAVES_OCW, old_mask);     PIC_DELAY();
        !            65: }
        !            66: 

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