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/10.3/sys/amd64/amd64/uma_machdep.c 287945 2015-09-17 23:31:44Z rstone $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/lock.h>
   32 #include <sys/malloc.h>
   33 #include <sys/mutex.h>
   34 #include <sys/systm.h>
   35 #include <vm/vm.h>
   36 #include <vm/vm_page.h>
   37 #include <vm/vm_pageout.h>
   38 #include <vm/uma.h>
   39 #include <vm/uma_int.h>
   40 #include <machine/md_var.h>
   41 #include <machine/vmparam.h>
   42 
   43 void *
   44 uma_small_alloc(uma_zone_t zone, vm_size_t bytes, u_int8_t *flags, int wait)
   45 {
   46         vm_page_t m;
   47         vm_paddr_t pa;
   48         void *va;
   49         int pflags;
   50 
   51         *flags = UMA_SLAB_PRIV;
   52         pflags = malloc2vm_flags(wait) | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED;
   53         for (;;) {
   54                 m = vm_page_alloc(NULL, 0, pflags);
   55                 if (m == NULL) {
   56                         if (wait & M_NOWAIT)
   57                                 return (NULL);
   58                         else
   59                                 VM_WAIT;
   60                 } else
   61                         break;
   62         }
   63         pa = m->phys_addr;
   64         if ((wait & M_NODUMP) == 0)
   65                 dump_add_page(pa);
   66         va = (void *)PHYS_TO_DMAP(pa);
   67         if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
   68                 pagezero(va);
   69         return (va);
   70 }
   71 
   72 void
   73 uma_small_free(void *mem, vm_size_t size, u_int8_t flags)
   74 {
   75         vm_page_t m;
   76         vm_paddr_t pa;
   77 
   78         pa = DMAP_TO_PHYS((vm_offset_t)mem);
   79         dump_drop_page(pa);
   80         m = PHYS_TO_VM_PAGE(pa);
   81         m->wire_count--;
   82         vm_page_free(m);
   83         atomic_subtract_int(&cnt.v_wire_count, 1);
   84 }

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