NetBSD/sys/arch/sun3x/stand/libsa/dvma.c

124 lines
3.5 KiB
C

/* $NetBSD: dvma.c,v 1.2 1997/03/13 17:52:49 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 <machine/pte.h>
#include <machine/mon.h>
#include <arch/sun3x/sun3x/iommu.h>
#include "stand.h"
#include "iommu.h"
#include "mmu.h"
void iommu_init();
#define SA_MIN_VA 0x200000
#define SA_MAX_VA ((SA_MIN_VA + MON_DVMA_SIZE) - NBPG)
#define MON_DVMA_MAPLEN (MON_DVMA_SIZE - NBPG)
/* This points to the end of the free DVMA space. */
u_int dvma_end = MON_DVMA_BASE + MON_DVMA_MAPLEN;
void
dvma_init()
{
u_int va, pa;
iommu_init();
pa = SA_MIN_VA;
va = MON_DVMA_BASE;
while (pa < SA_MAX_VA) {
set_pte(va, pa | MMU_DT_PAGE | MMU_SHORT_PTE_CI);
set_iommupde(va, pa | IOMMU_PDE_DT_VALID | IOMMU_PDE_CI);
va += NBPG;
pa += NBPG;
}
}
/* 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 += MON_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 < MON_DVMA_BASE) || (va >= (MON_DVMA_BASE + MON_DVMA_MAPLEN)))
panic("dvma_mapout");
va -= MON_DVMA_BASE;
va += SA_MIN_VA;
return ((char *) va);
}
char *
dvma_alloc(int len)
{
len = _round_page(len);
dvma_end -= len;
return((char*)dvma_end);
}
void
dvma_free(char *dvma, int len)
{
/* not worth the trouble */
}