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Annotation of Net2/arch/i386/isa/icu.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)icu.h       5.6 (Berkeley) 5/9/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * AT/386 Interrupt Control constants
        !            41:  * W. Jolitz 8/89
        !            42:  */
        !            43: 
        !            44: #ifndef        __ICU__
        !            45: #define        __ICU__
        !            46: 
        !            47: #ifndef        LOCORE
        !            48: 
        !            49: /*
        !            50:  * Interrupt "level" mechanism variables, masks, and macros
        !            51:  */
        !            52: extern unsigned short  imen;   /* interrupt mask enable */
        !            53: extern unsigned short  cpl;    /* current priority level mask */
        !            54: 
        !            55: extern unsigned short highmask; /* group of interrupts masked with splhigh() */
        !            56: extern unsigned short ttymask; /* group of interrupts masked with spltty() */
        !            57: extern unsigned short biomask; /* group of interrupts masked with splbio() */
        !            58: extern unsigned short netmask; /* group of interrupts masked with splimp() */
        !            59: 
        !            60: #define        INTREN(s)       imen &= ~(s)
        !            61: #define        INTRDIS(s)      imen |= (s)
        !            62: #define        INTRMASK(msk,s) msk |= (s)
        !            63: 
        !            64: #else
        !            65: 
        !            66: /*
        !            67:  * Macro's for interrupt level priority masks (used in interrupt vector entry)
        !            68:  */
        !            69: 
        !            70: /* Mask a group of interrupts atomically */
        !            71: #define        INTR(unit,mask,offst) \
        !            72:        pushl   $0 ; \
        !            73:        pushl   $ T_ASTFLT ; \
        !            74:        pushal ; \
        !            75:        push    %ds ; \
        !            76:        push    %es ; \
        !            77:        movw    $0x10, %ax ; \
        !            78:        movw    %ax, %ds ; \
        !            79:        movw    %ax,%es ; \
        !            80:        incl    _cnt+V_INTR ; \
        !            81:        incl    _isa_intr + offst * 4 ; \
        !            82:        movzwl  _cpl,%eax ; \
        !            83:        pushl   %eax ; \
        !            84:        pushl   $ unit ; \
        !            85:        orw     mask ,%ax ; \
        !            86:        movw    %ax,_cpl ; \
        !            87:        orw     _imen,%ax ; \
        !            88:        NOP ; \
        !            89:        outb    %al,$ IO_ICU1+1 ; \
        !            90:        NOP ; \
        !            91:        movb    %ah,%al ; \
        !            92:        outb    %al,$ IO_ICU2+1 ; \
        !            93:        NOP     ; \
        !            94:        inb     $0x84,%al ; \
        !            95:        sti
        !            96: 
        !            97: /* Interrupt vector exit macros */
        !            98: 
        !            99: /* First eight interrupts (ICU1) */
        !           100: #define        INTREXIT1       \
        !           101:        movb    $0x20,%al ; \
        !           102:        outb    %al,$ IO_ICU1 ; \
        !           103:        jmp     doreti
        !           104: 
        !           105: /* Second eight interrupts (ICU2) */
        !           106: #define        INTREXIT2       \
        !           107:        movb    $0x20,%al ; \
        !           108:        outb    %al,$ IO_ICU1 ; \
        !           109:        outb    %al,$ IO_ICU2 ; \
        !           110:        jmp     doreti
        !           111: 
        !           112: #endif
        !           113: 
        !           114: /*
        !           115:  * Interrupt enable bits -- in order of priority
        !           116:  */
        !           117: #define        IRQ0            0x0001          /* highest priority - timer */
        !           118: #define        IRQ1            0x0002
        !           119: #define        IRQ_SLAVE       0x0004
        !           120: #define        IRQ8            0x0100
        !           121: #define        IRQ9            0x0200
        !           122: #define        IRQ2            IRQ9
        !           123: #define        IRQ10           0x0400
        !           124: #define        IRQ11           0x0800
        !           125: #define        IRQ12           0x1000
        !           126: #define        IRQ13           0x2000
        !           127: #define        IRQ14           0x4000
        !           128: #define        IRQ15           0x8000
        !           129: #define        IRQ3            0x0008
        !           130: #define        IRQ4            0x0010
        !           131: #define        IRQ5            0x0020
        !           132: #define        IRQ6            0x0040
        !           133: #define        IRQ7            0x0080          /* lowest - parallel printer */
        !           134: 
        !           135: /*
        !           136:  * Interrupt Control offset into Interrupt descriptor table (IDT)
        !           137:  */
        !           138: #define        ICU_OFFSET      32              /* 0-31 are processor exceptions */
        !           139: #define        ICU_LEN         16              /* 32-47 are ISA interrupts */
        !           140: 
        !           141: #endif __ICU__

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