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/malloc.h>
   34 #include <sys/mutex.h>
   35 #include <sys/systm.h>
   36 #include <sys/sysctl.h>
   37 #include <sys/vmmeter.h>
   38 #include <vm/vm.h>
   39 #include <vm/vm_page.h>
   40 #include <vm/vm_kern.h>
   41 #include <vm/vm_pageout.h>
   42 #include <vm/vm_extern.h>
   43 #include <vm/uma.h>
   44 #include <vm/uma.h>
   45 #include <vm/uma_int.h>
   46 #include <machine/md_var.h>
   47 #include <machine/vmparam.h>
   48 
   49 static int hw_uma_mdpages;
   50 SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
   51            "UMA MD pages in use");
   52 
   53 void *
   54 uma_small_alloc(uma_zone_t zone, vm_size_t bytes, int domain, u_int8_t *flags,
   55     int wait)
   56 {
   57         void *va;
   58         vm_paddr_t pa;
   59         vm_page_t m;
   60         
   61         *flags = UMA_SLAB_PRIV;
   62 
   63         m = vm_page_alloc_domain(NULL, 0, domain,
   64             malloc2vm_flags(wait) | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ);
   65         if (m == NULL) 
   66                 return (NULL);
   67 
   68         pa = VM_PAGE_TO_PHYS(m);
   69         if (!hw_direct_map) {
   70                 pmap_kenter(pa, pa);
   71                 va = (void *)(vm_offset_t)pa;
   72         } else {
   73                 va = (void *)(vm_offset_t)PHYS_TO_DMAP(pa);
   74         }
   75 
   76         if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
   77                 bzero(va, PAGE_SIZE);
   78         atomic_add_int(&hw_uma_mdpages, 1);
   79 
   80         return (va);
   81 }
   82 
   83 void
   84 uma_small_free(void *mem, vm_size_t size, u_int8_t flags)
   85 {
   86         vm_page_t m;
   87 
   88         if (!hw_direct_map)
   89                 pmap_remove(kernel_pmap,(vm_offset_t)mem,
   90                     (vm_offset_t)mem + PAGE_SIZE);
   91 
   92         if (hw_direct_map)
   93                 m = PHYS_TO_VM_PAGE(DMAP_TO_PHYS((vm_offset_t)mem));
   94         else
   95                 m = PHYS_TO_VM_PAGE((vm_offset_t)mem);
   96         KASSERT(m != NULL,
   97             ("Freeing UMA block at %p with no associated page", mem));
   98         vm_page_unwire_noq(m);
   99         vm_page_free(m);
  100         atomic_subtract_int(&hw_uma_mdpages, 1);
  101 }

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

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