FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_phys.h

     /*-
      * Copyright (c) 2002-2006 Rice University
      * Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project by Alan L. Cox,
      * Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
     * HOLDERS 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.
     *
     * $FreeBSD: releng/10.0/sys/vm/vm_phys.h 254065 2013-08-07 16:36:38Z kib $
     */
    
    /*
     *      Physical memory system definitions
     */
    
    #ifndef _VM_PHYS_H_
    #define _VM_PHYS_H_
    
    #ifdef _KERNEL
    
    /* Domains must be dense (non-sparse) and zero-based. */
    struct mem_affinity {
            vm_paddr_t start;
            vm_paddr_t end;
            int domain;
    };
    
    struct vm_freelist {
            struct pglist pl;
            int lcnt;
    };
    
    struct vm_phys_seg {
            vm_paddr_t      start;
            vm_paddr_t      end;
            vm_page_t       first_page;
            int             domain;
            struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER];
    };
    
    extern struct mem_affinity *mem_affinity;
    extern int vm_ndomains;
    extern struct vm_phys_seg vm_phys_segs[];
    extern int vm_phys_nsegs;
    
    /*
     * The following functions are only to be used by the virtual memory system.
     */
    void vm_phys_add_page(vm_paddr_t pa);
    vm_page_t vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
        u_long alignment, vm_paddr_t boundary);
    vm_page_t vm_phys_alloc_freelist_pages(int flind, int pool, int order);
    vm_page_t vm_phys_alloc_pages(int pool, int order);
    boolean_t vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high);
    int vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
        vm_memattr_t memattr);
    void vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end);
    vm_page_t vm_phys_fictitious_to_vm_page(vm_paddr_t pa);
    void vm_phys_free_contig(vm_page_t m, u_long npages);
    void vm_phys_free_pages(vm_page_t m, int order);
    void vm_phys_init(void);
    vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
    void vm_phys_set_pool(int pool, vm_page_t m, int order);
    boolean_t vm_phys_unfree_page(vm_page_t m);
    boolean_t vm_phys_zero_pages_idle(void);
    
    /*
     *      vm_phys_domain:
     *
     *      Return the memory domain the page belongs to.
     */
    static inline struct vm_domain *
    vm_phys_domain(vm_page_t m)
    {
    #if MAXMEMDOM > 1
            int domn, segind;
    
           /* XXXKIB try to assert that the page is managed */
           segind = m->segind;
           KASSERT(segind < vm_phys_nsegs, ("segind %d m %p", segind, m));
           domn = vm_phys_segs[segind].domain;
           KASSERT(domn < vm_ndomains, ("domain %d m %p", domn, m));
           return (&vm_dom[domn]);
   #else
           return (&vm_dom[0]);
   #endif
   }
   
   static inline void
   vm_phys_freecnt_adj(vm_page_t m, int adj)
   {
   
           mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
           cnt.v_free_count += adj;
           vm_phys_domain(m)->vmd_free_count += adj;
   }
   
   #endif  /* _KERNEL */
   #endif  /* !_VM_PHYS_H_ */

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