106 lines
4.0 KiB
C
106 lines
4.0 KiB
C
/* $NetBSD: pmap.h,v 1.21 1997/02/28 19:57:35 gwr Exp $ */
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/*-
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* Copyright (c) 1996 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 Adam Glass and Gordon W. Ross.
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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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#ifndef _MACHINE_PMAP_
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#define _MACHINE_PMAP_
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/*
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* Physical map structures exported to the VM code.
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*/
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struct pmap {
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int pm_refcount; /* pmap reference count */
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simple_lock_data_t pm_lock; /* lock on pmap */
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int pm_version;
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int pm_ctxnum;
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unsigned char *pm_segmap;
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};
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typedef struct pmap *pmap_t;
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#ifdef _KERNEL
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extern struct pmap kernel_pmap_store;
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#define pmap_kernel() (&kernel_pmap_store)
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/* This is called from locore.s:cpu_switch() */
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void pmap_activate __P((pmap_t pmap));
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/*
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* We give the pmap code a chance to resolve faults by
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* reloading translations that it was forced to unload.
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* This function does that, and calls vm_fault if it
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* could not resolve the fault by reloading the MMU.
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*/
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int _pmap_fault __P((vm_map_t, vm_offset_t, vm_prot_t));
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/* This lets us have some say in choosing VA locations. */
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extern void pmap_prefer(vm_offset_t, vm_offset_t *);
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#define PMAP_PREFER(fo, ap) pmap_prefer((fo), (ap))
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/* This needs to be a macro for kern_sysctl.c */
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extern segsz_t pmap_resident_pages(pmap_t);
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#define pmap_resident_count(pmap) (pmap_resident_pages(pmap))
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/* This needs to be a macro for vm_mmap.c */
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extern segsz_t pmap_wired_pages(pmap_t);
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#define pmap_wired_count(pmap) (pmap_wired_pages(pmap))
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/* We use the PA plus some low bits for device mmap. */
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#define pmap_phys_address(addr) (addr)
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/* Our memory is contiguous (or nearly so). */
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#define pmap_page_index(pa) (atop(pa))
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/*
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* Since PTEs also contain type bits, we have to have some way
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* to tell pmap_enter `this is an IO page' or `this is not to
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* be cached'. Since physical addresses are always aligned, we
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* can do this with the low order bits.
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*
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* The values below must agree with pte.h such that:
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* (PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
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*/
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#define PMAP_OBIO 0x04 /* tells pmap_enter to use PG_OBIO */
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#define PMAP_VME16 0x08 /* etc */
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#define PMAP_VME32 0x0C /* etc */
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#define PMAP_NC 0x10 /* tells pmap_enter to set PG_NC */
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#define PMAP_SPEC 0x1C /* mask to get all above. */
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#endif /* _KERNEL */
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#endif /* _MACHINE_PMAP_ */
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