c1ebd497a3
Instead carefully write upper word, and only than the lower word with PG_V, for previously invalid ptes. It provides some measurable system time saving on buildworld. Reviewed by: markj Tested by: pho Measured by: bde (early version) Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D19226
102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* Copyright (c) 2018 The FreeBSD Foundation
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* 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 Systems Programming Group of the University of Utah Computer
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* Science Department and William Jolitz of UUNET Technologies Inc.
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*
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* Portions of this software were developed by
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* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
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* the FreeBSD Foundation.
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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. 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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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PMAP_NOPAE_H
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#define _MACHINE_PMAP_NOPAE_H
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#define NTRPPTD 1
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#define LOWPTDI 1
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#define KERNPTDI 2
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#define NPGPTD 1
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#define NPGPTD_SHIFT 10
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#undef PDRSHIFT
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#define PDRSHIFT PDRSHIFT_NOPAE
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#undef NBPDR
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#define NBPDR (1 << PDRSHIFT_NOPAE) /* bytes/page dir */
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#define PG_FRAME PG_FRAME_NOPAE
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#define PG_PS_FRAME PG_PS_FRAME_NOPAE
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#define KVA_PAGES (256*4)
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#ifndef NKPT
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#define NKPT 30
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#endif
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typedef uint32_t pd_entry_t;
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typedef uint32_t pt_entry_t;
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typedef uint32_t pdpt_entry_t; /* Only to keep struct pmap layout. */
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#define PTESHIFT (2)
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#define PDESHIFT (2)
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#define pde_cmpset(pdep, old, new) atomic_cmpset_int(pdep, old, new)
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#define pte_load_store(ptep, pte) atomic_swap_int(ptep, pte)
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#define pte_load_clear(ptep) atomic_swap_int(ptep, 0)
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#define pte_store(ptep, pte) do { \
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*(u_int *)(ptep) = (u_int)(pte); \
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} while (0)
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#define pte_store_zero(ptep, pte) pte_store(ptep, pte)
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#define pte_load(ptep) atomic_load_int(ptep)
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extern pt_entry_t PTmap[];
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extern pd_entry_t PTD[];
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extern pd_entry_t PTDpde[];
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extern pd_entry_t *IdlePTD_nopae;
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extern pt_entry_t *KPTmap_nopae;
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struct pmap;
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pt_entry_t *__CONCAT(PMTYPE, pmap_pte)(struct pmap *, vm_offset_t) __pure2;
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#endif
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