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Annotation of sys/arch/hp300/hp300/leds.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: leds.c,v 1.8 2005/01/08 22:13:24 miod Exp $   */
        !             2: /*     $NetBSD: leds.c,v 1.1 1997/05/05 20:54:35 thorpej Exp $ */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1988 University of Utah.
        !             6:  * Copyright (c) 1982, 1986, 1990, 1993
        !             7:  *     The Regents of the University of California.  All rights reserved.
        !             8:  *
        !             9:  * This code is derived from software contributed to Berkeley by
        !            10:  * the Systems Programming Group of the University of Utah Computer
        !            11:  * Science Department.
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  * from: Utah $Hdr: machdep.c 1.74 92/12/20$
        !            38:  *
        !            39:  *     @(#)machdep.c   8.10 (Berkeley) 4/20/94
        !            40:  */
        !            41:
        !            42: #include <sys/param.h>
        !            43:
        !            44: #include <uvm/uvm_extern.h>
        !            45:
        !            46: #include <hp300/hp300/leds.h>
        !            47:
        !            48: extern caddr_t ledbase;        /* kva of LED page */
        !            49: u_int8_t       *ledaddr;       /* actual address of LEDs */
        !            50: static int     inledcontrol;   /* mutex */
        !            51:
        !            52: /*
        !            53:  * Map the LED page and setup the KVA to access it.
        !            54:  */
        !            55: void
        !            56: ledinit()
        !            57: {
        !            58:
        !            59:        pmap_enter(pmap_kernel(), (vaddr_t)ledbase, (paddr_t)LED_ADDR,
        !            60:            VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
        !            61:        pmap_update(pmap_kernel());
        !            62:        ledaddr = (u_int8_t *) ((long)ledbase | (LED_ADDR & PGOFSET));
        !            63: }
        !            64:
        !            65: /*
        !            66:  * Do lights:
        !            67:  *     `ons' is a mask of LEDs to turn on,
        !            68:  *     `offs' is a mask of LEDs to turn off,
        !            69:  *     `togs' is a mask of LEDs to toggle.
        !            70:  * Note we don't use splclock/splx for mutual exclusion.
        !            71:  * They are expensive and we really don't need to be that precise.
        !            72:  * Besides we would like to be able to profile this routine.
        !            73:  */
        !            74: void
        !            75: ledcontrol(ons, offs, togs)
        !            76:        int ons, offs, togs;
        !            77: {
        !            78:        static u_int8_t currentleds;
        !            79:        u_int8_t leds;
        !            80:
        !            81:        if (inledcontrol)
        !            82:                return;
        !            83:
        !            84:        inledcontrol = 1;
        !            85:        leds = currentleds;
        !            86:        if (ons)
        !            87:                leds |= ons;
        !            88:        if (offs)
        !            89:                leds &= ~offs;
        !            90:        if (togs)
        !            91:                leds ^= togs;
        !            92:        currentleds = leds;
        !            93:        *ledaddr = ~leds;
        !            94:        inledcontrol = 0;
        !            95: }