sys/dev/drm/include/linux/vmalloc.h

   1 /*
   2  * Copyright (c) 2015-2016 François Tigeot
   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 unmodified, this list of conditions, and the following
  10  *    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 #ifndef _LINUX_VMALLOC_H_
  28 #define _LINUX_VMALLOC_H_
  29
  30 #include <vm/vm_extern.h>
  31
  32 static inline void *
  33 vmap(struct vm_page **pages, unsigned int count,
  34                 unsigned long flags, unsigned long prot)
  35 {
  36         vm_offset_t off;
  37         size_t size;
  38
  39         size = count * PAGE_SIZE;
  40         off = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE);
  41         if (off == 0)
  42                 return (NULL);
  43
  44         pmap_qenter(off, pages, count);
  45
  46         return (void *)off;
  47 }
  48
  49 /*
  50  * DragonFly note: kmem_free() requires a page count, linux code augmented
  51  * to provide it.
  52  */
  53 static inline void
  54 vunmap(const void *addr, unsigned int count)
  55 {
  56         pmap_qremove((vm_offset_t)addr, count);
  57         kmem_free(&kernel_map, (vm_offset_t)addr, IDX_TO_OFF(count));
  58 }
  59
  60 #endif  /* _LINUX_VMALLOC_H_ */