FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pmap_nopae.h

     /*-
      * 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_store_zero(ptep, pte)       pte_store(ptep, pte)
    #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

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