152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/* $NetBSD: dvma.c,v 1.9 2000/10/31 23:28:11 pk 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 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 just
|
|
* map the entire megabyte of RAM where we are loaded into DVMA space.
|
|
* That way, dvma_mapin can just compute the DVMA alias address, and
|
|
* dvma_mapout does nothing. Note that this assumes all standalone
|
|
* programs stay in the range `base_va' .. `base_va + DVMA_MAPLEN'
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sparc/sparc/asm.h>
|
|
#include <machine/pte.h>
|
|
#include <machine/ctlreg.h>
|
|
|
|
#include <lib/libsa/stand.h>
|
|
#include <sparc/stand/common/promdev.h>
|
|
|
|
#define DVMA_BASE 0xFFF00000
|
|
#define DVMA_MAPLEN 0xE0000 /* 1 MB - 128K (save MONSHORTSEG) */
|
|
|
|
static int base_va;
|
|
|
|
/*
|
|
* This module is only used on sun4, so:
|
|
*/
|
|
#define getsegmap(va) (lduha(va, ASI_SEGMAP))
|
|
#define setsegmap(va, pmeg) do stha(va, ASI_SEGMAP, pmeg); while(0)
|
|
|
|
void
|
|
dvma_init()
|
|
{
|
|
u_int segva, dmava;
|
|
int nseg;
|
|
extern int start;
|
|
|
|
/*
|
|
* Align our address base with the DVMA segment.
|
|
* Allocate one DVMA segment to cover the stack, which
|
|
* grows downward from `start'.
|
|
*/
|
|
dmava = DVMA_BASE;
|
|
base_va = segva = (((int)&start) & -NBPSG) - NBPSG;
|
|
|
|
/* Then double-map the DVMA adresses */
|
|
nseg = (DVMA_MAPLEN + NBPSG - 1) >> SGSHIFT;
|
|
while (nseg-- > 0) {
|
|
setsegmap(dmava, getsegmap(segva));
|
|
segva += NBPSG;
|
|
dmava += NBPSG;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a local address to a DVMA address.
|
|
*/
|
|
char *
|
|
dvma_mapin(addr, len)
|
|
char *addr;
|
|
size_t len;
|
|
{
|
|
int va = (int)addr;
|
|
|
|
va -= base_va;
|
|
|
|
#ifndef BOOTXX
|
|
/* Make sure the address is in the DVMA map. */
|
|
if (va < 0 || va >= DVMA_MAPLEN)
|
|
panic("dvma_mapin: va %x (DMA base %x)", va+base_va, base_va);
|
|
#endif
|
|
|
|
va += DVMA_BASE;
|
|
|
|
return ((char *)va);
|
|
}
|
|
|
|
/*
|
|
* Convert a DVMA address to a local address.
|
|
*/
|
|
char *
|
|
dvma_mapout(addr, len)
|
|
char *addr;
|
|
size_t len;
|
|
{
|
|
int va = (int)addr;
|
|
|
|
va -= DVMA_BASE;
|
|
|
|
#ifndef BOOTXX
|
|
/* Make sure the address is in the DVMA map. */
|
|
if (va < 0 || va >= DVMA_MAPLEN)
|
|
panic("dvma_mapout: va %x (DMA base %x)", va+base_va, base_va);
|
|
#endif
|
|
|
|
va += base_va;
|
|
|
|
return ((char *)va);
|
|
}
|
|
|
|
char *
|
|
dvma_alloc(len)
|
|
int len;
|
|
{
|
|
char *mem;
|
|
|
|
mem = alloc(len);
|
|
if (mem == NULL)
|
|
return (mem);
|
|
return (dvma_mapin(mem, len));
|
|
}
|
|
|
|
void
|
|
dvma_free(dvma, len)
|
|
char *dvma;
|
|
int len;
|
|
{
|
|
char *mem;
|
|
|
|
mem = dvma_mapout(dvma, len);
|
|
if (mem != NULL)
|
|
free(mem, len);
|
|
}
|