148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/* $NetBSD: dvma.c,v 1.8 2000/06/18 23:03:45 fvdl Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* 4. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Gordon Ross
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The easiest way to deal with the need for DVMA mappings is to just
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* map the entire megabyte of RAM where we are loaded into DVMA space.
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* That way, dvma_mapin can just compute the DVMA alias address, and
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* dvma_mapout does nothing. Note that this assumes all standalone
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* programs stay in the range `base_va' .. `base_va + DVMA_MAPLEN'
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*/
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#include <sys/param.h>
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#include <sparc/sparc/asm.h>
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#include <machine/pte.h>
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#include <machine/ctlreg.h>
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#include <lib/libsa/stand.h>
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#include <sparc/stand/common/promdev.h>
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#define DVMA_BASE 0xFFF00000
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#define DVMA_MAPLEN 0xE0000 /* 1 MB - 128K (save MONSHORTSEG) */
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static int base_va;
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/*
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* This module is only used on sun4, so:
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*/
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#define getsegmap(va) (lduha(va, ASI_SEGMAP))
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#define setsegmap(va, pmeg) do stha(va, ASI_SEGMAP, pmeg); while(0)
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void
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dvma_init()
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{
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u_int segva, dmava;
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int nseg;
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extern int start;
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/* Align our address base with the DVMA segment */
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dmava = DVMA_BASE;
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base_va = segva = (((int)&start) & DVMA_BASE) - 0x40000;
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/* Then double-map the DVMA adresses */
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nseg = (DVMA_MAPLEN + NBPSG - 1) >> SGSHIFT;
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while (nseg-- > 0) {
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setsegmap(dmava, getsegmap(segva));
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segva += NBPSG;
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dmava += NBPSG;
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}
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}
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/*
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* Convert a local address to a DVMA address.
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*/
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char *
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dvma_mapin(addr, len)
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char *addr;
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size_t len;
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{
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int va = (int)addr;
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va -= base_va;
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#ifndef BOOTXX
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/* Make sure the address is in the DVMA map. */
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if (va < 0 || va >= DVMA_MAPLEN)
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panic("dvma_mapin");
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#endif
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va += DVMA_BASE;
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return ((char *)va);
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}
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/*
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* Convert a DVMA address to a local address.
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*/
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char *
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dvma_mapout(addr, len)
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char *addr;
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size_t len;
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{
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int va = (int)addr;
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va -= DVMA_BASE;
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#ifndef BOOTXX
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/* Make sure the address is in the DVMA map. */
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if (va < 0 || va >= DVMA_MAPLEN)
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panic("dvma_mapout");
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#endif
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va += base_va;
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return ((char *)va);
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}
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char *
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dvma_alloc(len)
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int len;
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{
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char *mem;
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mem = alloc(len);
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if (mem == NULL)
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return (mem);
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return (dvma_mapin(mem, len));
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}
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void
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dvma_free(dvma, len)
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char *dvma;
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int len;
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{
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char *mem;
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mem = dvma_mapout(dvma, len);
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if (mem != NULL)
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free(mem, len);
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}
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