116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/* $NetBSD: mmu.c,v 1.1 1997/03/13 17:52:52 gwr Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jeremy Cooper.
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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. 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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Standalone functions for manipulating the Sun3x MMU.
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*/
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#include <sys/param.h>
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#include <machine/pte.h>
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#include <machine/mon.h>
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/* XXX - I'll let Jeremy deal with this. -gwr */
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#define MON_LOMEM_BASE 0
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#define MON_LOMEM_SIZE 0x400000
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#define MON_KDB_BASE MON_KDB_START
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void mmu_atc_flush __P((u_int32_t));
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void
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set_pte(va, pa)
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u_int32_t va; /* virt. address */
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u_int32_t pa; /* phys. address */
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{
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u_int pn;
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mmu_short_pte_t *tbl;
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if (va >= MON_LOMEM_BASE && va < (MON_LOMEM_BASE + MON_LOMEM_SIZE)) {
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/*
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* Main memory range.
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*/
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tbl = (mmu_short_pte_t *) *romVectorPtr->lomemptaddr;
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} else if (va >= MON_KDB_BASE && va < (MON_KDB_BASE + MON_KDB_SIZE)) {
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/*
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* Kernel Debugger range.
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*/
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va -= MON_KDB_BASE;
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tbl = (mmu_short_pte_t *) *romVectorPtr->monptaddr;
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} else if (va >= MON_DVMA_BASE) {
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/*
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* DVMA range.
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*/
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va -= MON_DVMA_BASE;
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tbl = (mmu_short_pte_t *) *romVectorPtr->shadowpteaddr;
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} else {
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/* invalid range */
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return;
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}
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/* Calculate the page number within the selected table. */
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pn = (va >> MMU_PAGE_SHIFT);
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/* Enter the PTE into the table. */
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tbl[pn].attr.raw = pa;
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/* Flush the ATC of any cached entries for the va. */
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mmu_atc_flush(va);
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}
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u_int32_t
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get_pte(va)
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u_int32_t va; /* virt. address */
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{
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u_int pn;
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mmu_short_pte_t *tbl;
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if (va >= MON_LOMEM_BASE && va < (MON_LOMEM_BASE + MON_LOMEM_SIZE)) {
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tbl = (mmu_short_pte_t *) *romVectorPtr->lomemptaddr;
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} else if (va >= MON_KDB_BASE && va < (MON_KDB_BASE + MON_KDB_SIZE)) {
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va -= MON_KDB_BASE;
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tbl = (mmu_short_pte_t *) *romVectorPtr->monptaddr;
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} else if (va >= MON_DVMA_BASE) {
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va -= MON_DVMA_BASE;
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tbl = (mmu_short_pte_t *) *romVectorPtr->shadowpteaddr;
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} else {
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return 0;
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}
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/* Calculate the page number within the selected table. */
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pn = (va >> MMU_PAGE_SHIFT);
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/* Extract the PTE from the table. */
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return tbl[pn].attr.raw;
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}
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