uma_machdep.c

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    1 /*-
    2  * Copyright (c) 2003 The FreeBSD Project
    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  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/systm.h>
   35 #include <sys/sysctl.h>
   36 #include <vm/vm.h>
   37 #include <vm/vm_page.h>
   38 #include <vm/vm_kern.h>
   39 #include <vm/vm_pageout.h>
   40 #include <vm/vm_extern.h>
   41 #include <vm/uma.h>
   42 #include <vm/uma.h>
   43 #include <vm/uma_int.h>
   44 #include <machine/md_var.h>
   45 #include <machine/vmparam.h>
   46 
   47 static int hw_uma_mdpages;
   48 SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
   49            "UMA MD pages in use");
   50 
   51 void *
   52 uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
   53 {
   54         static vm_pindex_t color;
   55         void *va;
   56         vm_page_t m;
   57         int pflags;
   58         
   59         *flags = UMA_SLAB_PRIV;
   60         if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
   61                 pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
   62         else
   63                 pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
   64         if (wait & M_ZERO)
   65                 pflags |= VM_ALLOC_ZERO;
   66 
   67         for (;;) {
   68                 m = vm_page_alloc(NULL, color++, pflags | VM_ALLOC_NOOBJ);
   69                 if (m == NULL) {
   70                         if (wait & M_NOWAIT)
   71                                 return (NULL);
   72                         VM_WAIT;
   73                 } else
   74                         break;
   75         }
   76 
   77         va = (void *) VM_PAGE_TO_PHYS(m);
   78 
   79         if (!hw_direct_map)
   80                 pmap_kenter((vm_offset_t)va, VM_PAGE_TO_PHYS(m));
   81 
   82         if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
   83                 bzero(va, PAGE_SIZE);
   84         atomic_add_int(&hw_uma_mdpages, 1);
   85 
   86         return (va);
   87 }
   88 
   89 void
   90 uma_small_free(void *mem, int size, u_int8_t flags)
   91 {
   92         vm_page_t m;
   93 
   94         if (!hw_direct_map)
   95                 pmap_remove(kernel_pmap,(vm_offset_t)mem,
   96                     (vm_offset_t)mem + PAGE_SIZE);
   97 
   98         m = PHYS_TO_VM_PAGE((vm_offset_t)mem);
   99         m->wire_count--;
  100         vm_page_free(m);
  101         atomic_subtract_int(&cnt.v_wire_count, 1);
  102         atomic_subtract_int(&hw_uma_mdpages, 1);
  103 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/aim/uma_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/aim/uma_machdep.c