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Annotation of researchv9/sys/sun3/probe.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)probe.c 1.1 86/02/03 Copyr 1983 Sun Micro";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 1983 by Sun Microsystems, Inc.
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Common routines for probing memory.
        !            11:  * Typically called by drivers during initialization to
        !            12:  * see if a device is present on the Mainbus.
        !            13:  */
        !            14: #include "../h/types.h"
        !            15: #include "../machine/fault.h"
        !            16: 
        !            17: static label_t *saved_jb;
        !            18: static label_t jb;
        !            19: 
        !            20: /*
        !            21:  * Probe a location by attempting to read a word
        !            22:  */
        !            23: peek(a)
        !            24:        short *a;
        !            25: {
        !            26:        int val;
        !            27: 
        !            28:        saved_jb = nofault;
        !            29:        nofault = (label_t *)jb;
        !            30:        if (!setjmp(jb)) {
        !            31:                val = *a;
        !            32:                /* if we get here, it worked */
        !            33:                nofault = saved_jb;
        !            34:                return (val & 0xFFFF);
        !            35:        }
        !            36:        /* A fault occured */
        !            37:        nofault = saved_jb;
        !            38:        return (-1);
        !            39: }
        !            40: 
        !            41: /*
        !            42:  * Probe a location by attempting to read a byte
        !            43:  */
        !            44: peekc(a)
        !            45:        char *a;
        !            46: {
        !            47:        int val;
        !            48: 
        !            49:        saved_jb = nofault;
        !            50:        nofault = (label_t *)jb;
        !            51:        if (!setjmp(jb)) {
        !            52:                val = *a;
        !            53:                /* if we get here, it worked */
        !            54:                nofault = saved_jb;
        !            55:                return (val & 0xFF);
        !            56:        }
        !            57:        /* A fault occured */
        !            58:        nofault = saved_jb;
        !            59:        return (-1);
        !            60: }
        !            61: 
        !            62: /*
        !            63:  * Probe a location by attempting to write a word
        !            64:  */
        !            65: poke(a, val)
        !            66:        short *a;
        !            67:        short val;
        !            68: {
        !            69: 
        !            70:        saved_jb = nofault;
        !            71:        nofault = (label_t *)jb;
        !            72:        if (!setjmp(jb)) {
        !            73:                *a = val;
        !            74:                /* if we get here, it worked */
        !            75:                nofault = saved_jb;
        !            76:                return (0);
        !            77:        }
        !            78:        /* A fault occured */
        !            79:        nofault = saved_jb;
        !            80:        return (1);
        !            81: }
        !            82: 
        !            83: /*
        !            84:  * Probe a location by attempting to write a byte
        !            85:  */
        !            86: pokec(a, val)
        !            87:        char *a;
        !            88:        char val;
        !            89: {
        !            90: 
        !            91:        saved_jb = nofault;
        !            92:        nofault = (label_t *)jb;
        !            93:        if (!setjmp(jb)) {
        !            94:                *a = val;
        !            95:                /* if we get here, it worked */
        !            96:                nofault = saved_jb;
        !            97:                return (0);
        !            98:        }
        !            99:        /* A fault occured */
        !           100:        nofault = saved_jb;
        !           101:        return (1);
        !           102: }

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