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/amd64/amd64/uma_machdep.c

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    1 /*-
    2  * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.1/sys/amd64/amd64/uma_machdep.c 172189 2007-09-15 18:47:02Z alc $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/lock.h>
   32 #include <sys/mutex.h>
   33 #include <sys/systm.h>
   34 #include <vm/vm.h>
   35 #include <vm/vm_page.h>
   36 #include <vm/vm_pageout.h>
   37 #include <vm/uma.h>
   38 #include <vm/uma_int.h>
   39 #include <machine/md_var.h>
   40 #include <machine/vmparam.h>
   41 
   42 void *
   43 uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
   44 {
   45         static vm_pindex_t colour;
   46         vm_page_t m;
   47         vm_paddr_t pa;
   48         void *va;
   49         int pflags;
   50 
   51         *flags = UMA_SLAB_PRIV;
   52         if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
   53                 pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
   54         else
   55                 pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
   56         if (wait & M_ZERO)
   57                 pflags |= VM_ALLOC_ZERO;
   58         for (;;) {
   59                 m = vm_page_alloc(NULL, colour++, pflags | VM_ALLOC_NOOBJ);
   60                 if (m == NULL) {
   61                         if (wait & M_NOWAIT)
   62                                 return (NULL);
   63                         else
   64                                 VM_WAIT;
   65                 } else
   66                         break;
   67         }
   68         pa = m->phys_addr;
   69         dump_add_page(pa);
   70         va = (void *)PHYS_TO_DMAP(pa);
   71         if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
   72                 pagezero(va);
   73         return (va);
   74 }
   75 
   76 void
   77 uma_small_free(void *mem, int size, u_int8_t flags)
   78 {
   79         vm_page_t m;
   80         vm_paddr_t pa;
   81 
   82         pa = DMAP_TO_PHYS((vm_offset_t)mem);
   83         dump_drop_page(pa);
   84         m = PHYS_TO_VM_PAGE(pa);
   85         m->wire_count--;
   86         vm_page_free(m);
   87         atomic_subtract_int(&cnt.v_wire_count, 1);
   88 }

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