1da427a80a
value (KERN_SUCCESS or KERN_RESOURCE_SHORTAGE) indicating if it succeeded or failed. Change the `wired' and `access_type' arguments to a single `flags' argument, which includes the access type, and flags: PMAP_WIRED the old `wired' boolean PMAP_CANFAIL pmap_enter() is allowed to fail If PMAP_CANFAIL is not specified, the pmap should behave as it always has in the face of a drastic resource shortage: fall over dead. Change the fault handler to deal with failure (which indicates resource shortage) by unlocking everything, waiting for the pagedaemon to free more memory, then retrying the fault.
166 lines
5.9 KiB
C
166 lines
5.9 KiB
C
/* $NetBSD: pmap.h,v 1.36 1999/11/13 00:24:39 thorpej Exp $ */
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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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* @(#)pmap.h 8.1 (Berkeley) 6/11/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Avadis Tevanian, Jr.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Machine address mapping definitions -- machine-independent
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* section. [For machine-dependent section, see "machine/pmap.h".]
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*/
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#ifndef _PMAP_VM_
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#define _PMAP_VM_
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struct proc; /* for pmap_activate()/pmap_deactivate() proto */
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/*
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* Each machine dependent implementation is expected to
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* keep certain statistics. They may do this anyway they
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* so choose, but are expected to return the statistics
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* in the following structure.
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*/
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struct pmap_statistics {
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long resident_count; /* # of pages mapped (total)*/
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long wired_count; /* # of pages wired */
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};
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typedef struct pmap_statistics *pmap_statistics_t;
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#include <machine/pmap.h>
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/*
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* Flags passed to pmap_enter(). Note the bottom 3 bits are VM_PROT_*
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* bits, used to indicate the access type that was made (to seed modified
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* and referenced information).
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*/
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#define PMAP_WIRED 0x00000010 /* wired mapping */
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#define PMAP_CANFAIL 0x00000020 /* can fail if resource shortage */
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#ifndef PMAP_EXCLUDE_DECLS /* Used in Sparc port to virtualize pmap mod */
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#ifdef _KERNEL
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__BEGIN_DECLS
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void *pmap_bootstrap_alloc __P((int));
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void pmap_activate __P((struct proc *));
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void pmap_deactivate __P((struct proc *));
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void pmap_unwire __P((pmap_t, vaddr_t));
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#if !defined(pmap_clear_modify)
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boolean_t pmap_clear_modify __P((struct vm_page *));
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#endif
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#if !defined(pmap_clear_reference)
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boolean_t pmap_clear_reference __P((struct vm_page *));
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#endif
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void pmap_collect __P((pmap_t));
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void pmap_copy __P((pmap_t,
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pmap_t, vaddr_t, vsize_t, vaddr_t));
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void pmap_copy_page __P((paddr_t, paddr_t));
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struct pmap *pmap_create __P((void));
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void pmap_destroy __P((pmap_t));
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int pmap_enter __P((pmap_t,
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vaddr_t, paddr_t, vm_prot_t, int));
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boolean_t pmap_extract __P((pmap_t, vaddr_t, paddr_t *));
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#if defined(PMAP_GROWKERNEL)
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vaddr_t pmap_growkernel __P((vaddr_t));
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#endif
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void pmap_init __P((void));
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void pmap_kenter_pa __P((vaddr_t, paddr_t, vm_prot_t));
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void pmap_kenter_pgs __P((vaddr_t, struct vm_page **, int));
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void pmap_kremove __P((vaddr_t, vsize_t));
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#if !defined(pmap_is_modified)
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boolean_t pmap_is_modified __P((struct vm_page *));
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#endif
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#if !defined(pmap_is_referenced)
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boolean_t pmap_is_referenced __P((struct vm_page *));
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#endif
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void pmap_page_protect __P((struct vm_page *, vm_prot_t));
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#if !defined(pmap_phys_address)
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paddr_t pmap_phys_address __P((int));
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#endif
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void pmap_protect __P((pmap_t,
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vaddr_t, vaddr_t, vm_prot_t));
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void pmap_reference __P((pmap_t));
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void pmap_remove __P((pmap_t, vaddr_t, vaddr_t));
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void pmap_update __P((void));
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void pmap_zero_page __P((paddr_t));
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#if defined(PMAP_STEAL_MEMORY)
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vaddr_t pmap_steal_memory __P((vsize_t, paddr_t *,
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paddr_t *));
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#else
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void pmap_virtual_space __P((vaddr_t *, vaddr_t *));
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#endif
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#if defined(PMAP_FORK)
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void pmap_fork __P((pmap_t, pmap_t));
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#endif
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__END_DECLS
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#endif /* kernel*/
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#endif /* PMAP_EXCLUDE_DECLS */
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#endif /* _PMAP_VM_ */
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