The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2002-2006 Rice University
    3  * Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Alan L. Cox,
    7  * Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   21  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
   22  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   25  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
   28  * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $FreeBSD$
   32  */
   33 
   34 /*
   35  *      Physical memory system definitions
   36  */
   37 
   38 #ifndef _VM_PHYS_H_
   39 #define _VM_PHYS_H_
   40 
   41 #ifdef _KERNEL
   42 
   43 /* Domains must be dense (non-sparse) and zero-based. */
   44 struct mem_affinity {
   45         vm_paddr_t start;
   46         vm_paddr_t end;
   47         int domain;
   48 };
   49 
   50 struct vm_freelist {
   51         struct pglist pl;
   52         int lcnt;
   53 };
   54 
   55 struct vm_phys_seg {
   56         vm_paddr_t      start;
   57         vm_paddr_t      end;
   58         vm_page_t       first_page;
   59         int             domain;
   60         struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER];
   61 };
   62 
   63 extern struct mem_affinity *mem_affinity;
   64 extern int vm_ndomains;
   65 extern struct vm_phys_seg vm_phys_segs[];
   66 extern int vm_phys_nsegs;
   67 
   68 /*
   69  * The following functions are only to be used by the virtual memory system.
   70  */
   71 void vm_phys_add_page(vm_paddr_t pa);
   72 void vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end);
   73 vm_page_t vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
   74     u_long alignment, vm_paddr_t boundary);
   75 vm_page_t vm_phys_alloc_freelist_pages(int freelist, int pool, int order);
   76 vm_page_t vm_phys_alloc_pages(int pool, int order);
   77 boolean_t vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high);
   78 int vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
   79     vm_memattr_t memattr);
   80 void vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end);
   81 vm_page_t vm_phys_fictitious_to_vm_page(vm_paddr_t pa);
   82 void vm_phys_free_contig(vm_page_t m, u_long npages);
   83 void vm_phys_free_pages(vm_page_t m, int order);
   84 void vm_phys_init(void);
   85 vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
   86 void vm_phys_set_pool(int pool, vm_page_t m, int order);
   87 boolean_t vm_phys_unfree_page(vm_page_t m);
   88 boolean_t vm_phys_zero_pages_idle(void);
   89 
   90 /*
   91  *      vm_phys_domain:
   92  *
   93  *      Return the memory domain the page belongs to.
   94  */
   95 static inline struct vm_domain *
   96 vm_phys_domain(vm_page_t m)
   97 {
   98 #if MAXMEMDOM > 1
   99         int domn, segind;
  100 
  101         /* XXXKIB try to assert that the page is managed */
  102         segind = m->segind;
  103         KASSERT(segind < vm_phys_nsegs, ("segind %d m %p", segind, m));
  104         domn = vm_phys_segs[segind].domain;
  105         KASSERT(domn < vm_ndomains, ("domain %d m %p", domn, m));
  106         return (&vm_dom[domn]);
  107 #else
  108         return (&vm_dom[0]);
  109 #endif
  110 }
  111 
  112 static inline void
  113 vm_phys_freecnt_adj(vm_page_t m, int adj)
  114 {
  115 
  116         mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
  117         cnt.v_free_count += adj;
  118         vm_phys_domain(m)->vmd_free_count += adj;
  119 }
  120 
  121 #endif  /* _KERNEL */
  122 #endif  /* !_VM_PHYS_H_ */

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