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/* $OpenBSD: dvma.c,v 1.6 2002/03/14 03:16:01 millert Exp $ */
/* $NetBSD: dvma.c,v 1.6 1996/01/31 17:20:39 gwr Exp $ */
/*
* Copyright (c) 1995 Gordon W. Ross
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gordon W. Ross
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* The easiest way to deal with the need for DVMA mappings is to
* create a DVMA alias mapping of the entire address range used by
* the boot program. That way, dvma_mapin can just compute the
* DVMA alias address, and dvma_mapout does nothing.
*
* Note that this assumes that standalone programs will do I/O
* operations only within range (SA_MIN_VA .. SA_MAX_VA) checked.
*/
#include <sys/param.h>
#include "stand.h"
/* XXX */
extern int get_segmap(int);
extern void set_segmap(int, int);
#define DVMA_BASE 0xFFf00000
#define DVMA_MAPLEN 0xE0000 /* 1 MB - 128K (save MONSHORTSEG) */
#define SA_MIN_VA 0x200000
#define SA_MAX_VA (SA_MIN_VA + DVMA_MAPLEN)
/* This points to the end of the free DVMA space. */
u_int dvma_end = DVMA_BASE + DVMA_MAPLEN;
void
dvma_init()
{
int segva, dmava, sme;
segva = SA_MIN_VA;
dmava = DVMA_BASE;
while (segva < SA_MAX_VA) {
sme = get_segmap(segva);
set_segmap(dmava, sme);
segva += NBSG;
dmava += NBSG;
}
}
/* Convert a local address to a DVMA address. */
char *
dvma_mapin(char *addr, int len)
{
int va = (int)addr;
/* Make sure the address is in the DVMA map. */
if ((va < SA_MIN_VA) || (va >= SA_MAX_VA))
panic("dvma_mapin");
va -= SA_MIN_VA;
va += DVMA_BASE;
return ((char *) va);
}
/* Convert a DVMA address to a local address. */
char *
dvma_mapout(char *addr, int len)
{
int va = (int)addr;
/* Make sure the address is in the DVMA map. */
if ((va < DVMA_BASE) || (va >= (DVMA_BASE + DVMA_MAPLEN)))
panic("dvma_mapout");
va -= DVMA_BASE;
va += SA_MIN_VA;
return ((char *) va);
}
char *
dvma_alloc(int len)
{
len = m68k_round_page(len);
dvma_end -= len;
return((char *)dvma_end);
}
void
dvma_free(char *dvma, int len)
{
/* not worth the trouble */
}
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