223 lines
7.8 KiB
C
223 lines
7.8 KiB
C
/* $NetBSD: iommu.c,v 1.1 1999/06/04 13:48:48 mrg Exp $ */
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/*-
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* Copyright (c) 1998 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 Paul Kranenburg.
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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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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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 University of
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* California, Lawrence Berkeley Laboratory.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: NetBSD: sbus.c,v 1.13 1999/05/23 07:24:02 mrg Exp
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* from: @(#)sbus.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/param.h>
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#include <sys/extent.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <vm/vm.h>
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#include <machine/bus.h>
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#include <sparc64/sparc64/vaddrs.h>
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#include <sparc64/dev/iommureg.h>
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#include <sparc64/dev/iommuvar.h>
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#include <machine/autoconf.h>
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#include <machine/ctlreg.h>
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#include <machine/cpu.h>
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#ifdef DEBUG
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#define IDB_DVMA 0x1
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#define IDB_INTR 0x2
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int iommudebug = 0;
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#endif
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/*
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* initialise the UltraSPARC IOMMU (SBUS or PCI):
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* - allocate and setup the iotsb.
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* - enable the IOMMU
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* - initialise the streaming buffers
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* - create a private DVMA map.
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*
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*/
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void
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iommu_init(name, is, tsbsize)
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char *name;
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struct iommu_state *is;
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int tsbsize;
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{
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/*
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* Setup the iommu.
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*
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* The sun4u iommu is part of the SBUS controller so we will
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* deal with it here. We could try to fake a device node so
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* we can eventually share it with the PCI bus run by psycho,
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* but I don't want to get into that sort of cruft.
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*
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* First we need to allocate a IOTSB. Problem is that the IOMMU
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* can only access the IOTSB by physical address, so all the
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* pages must be contiguous. Luckily, the smallest IOTSB size
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* is one 8K page.
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*/
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if (tsbsize != 0)
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panic("tsbsize != 0; FIX ME"); /* XXX */
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/* we want 8K pages */
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is->is_cr = IOMMUCR_8KPG | IOMMUCR_EN;
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/* set the tsbsize and get the dvmabase */
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switch (tsbsize) {
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case 0:
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is->is_dvmabase = 0x1fffffff;
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is->is_cr |= IOMMUCR_TSB1K;
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break;
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#if 0
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/* XXX are these right? got the values from the linux driver */
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case 1:
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is->is_dvmabase = 0x3fffffff;
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is->is_cr |= IOMMUCR_TSB2K;
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break;
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case 2:
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is->is_dvmabase = 0x7fffffff;
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is->is_cr |= IOMMUCR_TSB4K;
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break;
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#endif
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default:
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panic("unknown tsbsize, fix me");
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}
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is->is_tsbsize = tsbsize;
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is->is_tsb = malloc(NBPG, M_DMAMAP, M_WAITOK); /* XXX */
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is->is_ptsb = pmap_extract(pmap_kernel(), (vaddr_t)is->is_tsb);
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#ifdef DEBUG
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if (iommudebug & IDB_DVMA)
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{
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/* Probe the iommu */
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struct iommureg *regs = is->is_iommu;
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int64_t cr, tsb;
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printf("iommu regs at: cr=%lx tsb=%lx flush=%lx\n", ®s->iommu_cr,
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®s->iommu_tsb, ®s->iommu_flush);
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cr = regs->iommu_cr;
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tsb = regs->iommu_tsb;
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printf("iommu cr=%lx tsb=%lx\n", (long)cr, (long)tsb);
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printf("TSB base %p phys %p\n", (long)is->is_tsb, (long)is->is_ptsb);
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delay(1000000); /* 1 s */
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}
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#endif
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/*
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* Initialize streaming buffer.
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*/
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is->is_flushpa = pmap_extract(pmap_kernel(), (vaddr_t)&is->is_flush);
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/*
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* now actually start up the IOMMU
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*/
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iommu_reset(is);
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/*
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* Now all the hardware's working we need to allocate a dvma map.
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*
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* The IOMMU address space always ends at 0xffffe000, but the starting
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* address depends on the size of the map. The map size is 1024 * 2 ^
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* is->is_tsbsize entries, where each entry is 8 bytes. The start of
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* the map can be calculated by (0xffffe000 << (8 + is->is_tsbsize)).
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*
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* Note: the stupid IOMMU ignores the high bits of an address, so a
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* NULL DMA pointer will be translated by the first page of the IOTSB.
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* To trap bugs we'll skip the first entry in the IOTSB.
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*/
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is->is_dvmamap = extent_create(name,
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IOTSB_VSTART(is->is_tsbsize) + NBPG, IOTSB_VEND,
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M_DEVBUF, 0, 0, EX_NOWAIT);
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}
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void
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iommu_reset(is)
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struct iommu_state *is;
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{
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/* Need to do 64-bit stores */
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bus_space_write_8(is->is_bustag, &is->is_iommu->iommu_cr, 0, is->is_cr);
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bus_space_write_8(is->is_bustag, &is->is_iommu->iommu_tsb, 0, is->is_ptsb);
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/* Enable diagnostics mode? */
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bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_ctl, 0, STRBUF_EN);
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}
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