Differential D18894 Diff 52999 sys/i386/include/pmap_nopae.h

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sys/i386/include/pmap_nopae.h

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				/*-
				* SPDX-License-Identifier: BSD-3-Clause
				*
				* Copyright (c) 1991 Regents of the University of California.
				* All rights reserved.
				*
				* Copyright (c) 2018 The FreeBSD Foundation
				* All rights reserved.
				*
				* This code is derived from software contributed to Berkeley by
				* the Systems Programming Group of the University of Utah Computer
				* Science Department and William Jolitz of UUNET Technologies Inc.
				*
				* Portions of this software were developed by
				* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
				* the FreeBSD Foundation.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				* 3. Neither the name of the University nor the names of its contributors
				* may be used to endorse or promote products derived from this software
				* without specific prior written permission.
				*
				* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*
				* Derived from hp300 version by Mike Hibler, this version by William
				* Jolitz uses a recursive map [a pde points to the page directory] to
				* map the page tables using the pagetables themselves. This is done to
				* reduce the impact on kernel virtual memory for lots of sparse address
				* space, and to reduce the cost of memory to each process.
				*
				* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
				* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
				* $FreeBSD$
				*/

				#ifndef _MACHINE_PMAP_NOPAE_H
				#define _MACHINE_PMAP_NOPAE_H

				#define NTRPPTD 1
				#define LOWPTDI 1
				#define KERNPTDI 2

				#define NPGPTD 1
				#define NPGPTD_SHIFT 10
				#undef PDRSHIFT
				#define PDRSHIFT PDRSHIFT_NOPAE
				#undef NBPDR
				#define NBPDR (1 << PDRSHIFT_NOPAE) /* bytes/page dir */

				#define PG_FRAME PG_FRAME_NOPAE
				#define PG_PS_FRAME PG_PS_FRAME_NOPAE

				#define KVA_PAGES (256*4)

				#ifndef NKPT
				#define NKPT 30
				#endif

				typedef uint32_t pd_entry_t;
				typedef uint32_t pt_entry_t;
				typedef uint32_t pdpt_entry_t; /* Only to keep struct pmap layout. */

				#define PTESHIFT (2)
				#define PDESHIFT (2)

				#define pde_cmpset(pdep, old, new) atomic_cmpset_int(pdep, old, new)
				#define pte_load_store(ptep, pte) atomic_swap_int(ptep, pte)
				#define pte_load_clear(ptep) atomic_swap_int(ptep, 0)
				#define pte_store(ptep, pte) do { \
				(u_int )(ptep) = (u_int)(pte); \
				} while (0)
				#define pte_load(ptep) atomic_load_int(ptep)

				extern pt_entry_t PTmap[];
				extern pd_entry_t PTD[];
				extern pd_entry_t PTDpde[];
				extern pd_entry_t *IdlePTD_nopae;
				extern pt_entry_t *KPTmap_nopae;

				struct pmap;
				pt_entry_t __CONCAT(PMTYPE, pmap_pte)(struct pmap , vm_offset_t) __pure2;

				#endif