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dvma.c revision 1.3.2.2 
      1 /*	$NetBSD: dvma.c,v 1.3.2.2 2000/07/23 16:13:49 he Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Gordon W. Ross
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  * 4. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *      This product includes software developed by Gordon Ross
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * The easiest way to deal with the need for DVMA mappings is to just
     34  * map the entire megabyte of RAM where we are loaded into DVMA space.
     35  * That way, dvma_mapin can just compute the DVMA alias address, and
     36  * dvma_mapout does nothing.  Note that this assumes all standalone
     37  * programs stay in the range `base_va' .. `base_va + DVMA_MAPLEN'
     38  */
     39 
     40 #include <sys/param.h>
     41 #include <sparc/sparc/asm.h>
     42 #include <machine/pte.h>
     43 #include <machine/ctlreg.h>
     44 
     45 #include <lib/libsa/stand.h>
     46 #include <sparc/stand/common/promdev.h>
     47 
     48 #define	DVMA_BASE	0xFFF00000
     49 #define DVMA_MAPLEN	0xE0000	/* 1 MB - 128K (save MONSHORTSEG) */
     50 
     51 static int base_va;
     52 
     53 /*
     54  * This module is only used on sun4, so:
     55  */
     56 #define	getsegmap(va)		(lduha(va, ASI_SEGMAP))
     57 #define	setsegmap(va, pmeg)	do stha(va, ASI_SEGMAP, pmeg); while(0)
     58 
     59 void
     60 dvma_init()
     61 {
     62 	u_int segva, dmava;
     63 	int nseg;
     64 	extern int start asm("start");
     65 
     66 	/* Align our address base with the DVMA segment */
     67 	dmava = DVMA_BASE;
     68 	base_va = segva = (((int)&start)  - 0x40000) & DVMA_BASE;
     69 
     70 	/* Then double-map the DVMA adresses */
     71 	nseg = (DVMA_MAPLEN + NBPSG - 1) >> SGSHIFT;
     72 	while (nseg-- > 0) {
     73 		setsegmap(dmava, getsegmap(segva));
     74 		segva += NBPSG;
     75 		dmava += NBPSG;
     76 	}
     77 }
     78 
     79 /*
     80  * Convert a local address to a DVMA address.
     81  */
     82 char *
     83 dvma_mapin(addr, len)
     84 	char *addr;
     85 	size_t len;
     86 {
     87 	int va = (int)addr;
     88 
     89 	va -= base_va;
     90 
     91 #ifndef BOOTXX
     92 	/* Make sure the address is in the DVMA map. */
     93 	if (va < 0 || va >= DVMA_MAPLEN)
     94 		panic("dvma_mapin");
     95 #endif
     96 
     97 	va += DVMA_BASE;
     98 
     99 	return ((char *)va);
    100 }
    101 
    102 /*
    103  * Convert a DVMA address to a local address.
    104  */
    105 char *
    106 dvma_mapout(addr, len)
    107 	char *addr;
    108 	size_t len;
    109 {
    110 	int va = (int)addr;
    111 
    112 	va -= DVMA_BASE;
    113 
    114 #ifndef BOOTXX
    115 	/* Make sure the address is in the DVMA map. */
    116 	if (va < 0 || va >= DVMA_MAPLEN)
    117 		panic("dvma_mapout");
    118 #endif
    119 
    120 	va += base_va;
    121 
    122 	return ((char *)va);
    123 }
    124 
    125 char *
    126 dvma_alloc(len)
    127 	int len;
    128 {
    129 	char *mem;
    130 
    131 	mem = alloc(len);
    132 	if (mem == NULL)
    133 		return (mem);
    134 	return (dvma_mapin(mem, len));
    135 }
    136 
    137 void
    138 dvma_free(dvma, len)
    139 	char *dvma;
    140 	int len;
    141 {
    142 	char *mem;
    143 
    144 	mem = dvma_mapout(dvma, len);
    145 	if (mem != NULL)
    146 		free(mem, len);
    147 }
    148