98a8e8b486
(domU only). PAE support is enabled by 'options PAE', see the new XEN3PAE_DOMU
and INSTALL_XEN3PAE_DOMU kernel config files.
See the comments in arch/i386/include/{pte.h,pmap.h} to see how it works.
In short, we still handle it as a 2-level MMU, with the second level page
directory being 4 pages in size. pmap switching is done by switching the
L2 pages in the L3 entries, instead of loading %cr3. This is almost required
by Xen, which handle the last L2 page (the one mapping 0xc0000000 - 0xffffffff)
in a very special way. But this approach should also work for native PAE
support if ever supported (in fact, the pmap should almost suport native
PAE, what's missing is bootstrap code in locore.S).
70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/* $NetBSD: bus_private.h,v 1.9 2008/01/23 19:46:45 bouyer Exp $ */
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/*-
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* Copyright (c)2005 YAMAMOTO Takashi,
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <uvm/uvm_extern.h>
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#include "opt_xen.h"
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#define _BUS_PHYS_TO_BUS(pa) ((bus_addr_t)xpmap_ptom(pa))
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#define _BUS_BUS_TO_PHYS(ba) ((paddr_t)xpmap_mtop(ba))
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#define _BUS_VIRT_TO_BUS(pm, va) _bus_virt_to_bus((pm), (va))
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#define _BUS_BUS_TO_VM_PAGE(ba) (PHYS_TO_VM_PAGE(xpmap_mtop(ba)))
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#define _BUS_PMAP_ENTER(pmap, va, ba, prot, flags) \
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pmap_enter(pmap, va, xpmap_mtop(ba), prot, flags)
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static __inline bus_addr_t _bus_virt_to_bus(struct pmap *, vaddr_t);
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static __inline bus_addr_t
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_bus_virt_to_bus(struct pmap *pm, vaddr_t va)
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{
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bus_addr_t ba;
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if (!pmap_extract_ma(pm, va, &ba)) {
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panic("_bus_virt_to_bus");
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}
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return ba;
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}
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/* we need our own bus_dmamem_alloc_range */
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#define _BUS_DMAMEM_ALLOC_RANGE _xen_bus_dmamem_alloc_range
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int _xen_bus_dmamem_alloc_range(bus_dma_tag_t, bus_size_t, bus_size_t,
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bus_size_t, bus_dma_segment_t *, int, int *, int,
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bus_addr_t, bus_addr_t);
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/*
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* The higher machine address of our allocated range isn't know and can change
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* over time. Just assume it's the largest possible value.
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*/
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#if defined(_LP64) || defined(PAE)
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#define _BUS_AVAIL_END ((bus_addr_t)0xffffffffffffffff)
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#else
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#define _BUS_AVAIL_END ((bus_addr_t)0xffffffff)
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#endif
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#include <x86/bus_private.h>
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