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Annotation of sys/arch/sparc/stand/common/dvma.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: dvma.c,v 1.3 2003/08/14 17:13:57 deraadt Exp $        */
        !             2: /*     $NetBSD: dvma.c,v 1.2 1995/09/17 00:50:56 pk Exp $      */
        !             3: /*
        !             4:  * Copyright (c) 1995 Gordon W. Ross
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. The name of the author may not be used to endorse or promote products
        !            16:  *    derived from this software without specific prior written permission.
        !            17:  * 4. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *      This product includes software developed by Gordon Ross
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            22:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            23:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            24:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            25:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            26:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            27:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            28:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            29:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            30:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            31:  */
        !            32:
        !            33: /*
        !            34:  * The easiest way to deal with the need for DVMA mappings is
        !            35:  * to just map the entire third megabyte of RAM into DVMA space.
        !            36:  * That way, dvma_mapin can just compute the DVMA alias address,
        !            37:  * and dvma_mapout does nothing.  Note that this assumes all
        !            38:  * standalone programs stay in the range SA_MIN_VA .. SA_MAX_VA
        !            39:  */
        !            40:
        !            41: #include <sys/param.h>
        !            42: #include <machine/pte.h>
        !            43: #include <machine/ctlreg.h>
        !            44:
        !            45: #include <sparc/stand/common/promdev.h>
        !            46:
        !            47: #define        DVMA_BASE       0xFFF00000
        !            48: #define DVMA_MAPLEN    0xE0000 /* 1 MB - 128K (save MONSHORTSEG) */
        !            49:
        !            50: #define SA_MIN_VA      (RELOC - 0x40000)       /* XXX - magic constant */
        !            51: #define SA_MAX_VA      (SA_MIN_VA + DVMA_MAPLEN)
        !            52:
        !            53: void
        !            54: dvma_init(void)
        !            55: {
        !            56:        register int segva, dmava;
        !            57:
        !            58:        dmava = DVMA_BASE;
        !            59:        for (segva = SA_MIN_VA; segva < SA_MAX_VA; segva += NBPSG) {
        !            60:                setsegmap(dmava, getsegmap(segva));
        !            61:                dmava += NBPSG;
        !            62:        }
        !            63: }
        !            64:
        !            65: /*
        !            66:  * Convert a local address to a DVMA address.
        !            67:  */
        !            68: char *
        !            69: dvma_mapin(char *addr, size_t len)
        !            70: {
        !            71:        register int va = (int)addr;
        !            72:
        !            73:        /* Make sure the address is in the DVMA map. */
        !            74:        if ((va < SA_MIN_VA) || (va >= SA_MAX_VA))
        !            75:                panic("dvma_mapin");
        !            76:
        !            77:        va += DVMA_BASE - SA_MIN_VA;
        !            78:
        !            79:        return ((char *)va);
        !            80: }
        !            81:
        !            82: /*
        !            83:  * Convert a DVMA address to a local address.
        !            84:  */
        !            85: char *
        !            86: dvma_mapout(char *addr, size_t len)
        !            87: {
        !            88:        int va = (int)addr;
        !            89:
        !            90:        /* Make sure the address is in the DVMA map. */
        !            91:        if ((va < DVMA_BASE) || (va >= (DVMA_BASE + DVMA_MAPLEN)))
        !            92:                panic("dvma_mapout");
        !            93:
        !            94:        va -= DVMA_BASE - SA_MIN_VA;
        !            95:
        !            96:        return ((char *)va);
        !            97: }
        !            98:
        !            99: extern char *alloc(int);
        !           100:
        !           101: char *
        !           102: dvma_alloc(int len)
        !           103: {
        !           104:        char *mem;
        !           105:
        !           106:        mem = alloc(len);
        !           107:        if (!mem)
        !           108:                return (mem);
        !           109:        return (dvma_mapin(mem, len));
        !           110: }
        !           111:
        !           112: extern void free(void *ptr, int len);
        !           113: void
        !           114: dvma_free(char *dvma, int len)
        !           115: {
        !           116:        char *mem;
        !           117:
        !           118:        mem = dvma_mapout(dvma, len);
        !           119:        if (mem)
        !           120:                free(mem, len);
        !           121: }