include/pcmcia/mem_op.h

   1 /*
   2  * mem_op.h 1.10 1999/08/28 04:12:33
   3  *
   4  * The contents of this file are subject to the Mozilla Public License
   5  * Version 1.1 (the "License"); you may not use this file except in
   6  * compliance with the License. You may obtain a copy of the License
   7  * at http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS"
  10  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  11  * the License for the specific language governing rights and
  12  * limitations under the License.
  13  *
  14  * The initial developer of the original code is David A. Hinds
  15  * <dhinds@hyper.stanford.edu>.  Portions created by David A. Hinds
  16  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  17  *
  18  * Alternatively, the contents of this file may be used under the
  19  * terms of the GNU Public License version 2 (the "GPL"), in which
  20  * case the provisions of the GPL are applicable instead of the
  21  * above.  If you wish to allow the use of your version of this file
  22  * only under the terms of the GPL and not to allow others to use
  23  * your version of this file under the MPL, indicate your decision by
  24  * deleting the provisions above and replace them with the notice and
  25  * other provisions required by the GPL.  If you do not delete the
  26  * provisions above, a recipient may use your version of this file
  27  * under either the MPL or the GPL.
  28  */
  29
  30 #ifndef _LINUX_MEM_OP_H
  31 #define _LINUX_MEM_OP_H
  32
  33 #include <asm/uaccess.h>
  34
  35 /*
  36    If UNSAFE_MEMCPY is defined, we use the (optimized) system routines
  37    to copy between a card and kernel memory.  These routines do 32-bit
  38    operations which may not work with all PCMCIA controllers.  The
  39    safe versions defined here will do only 8-bit and 16-bit accesses.
  40 */
  41
  42 #ifdef UNSAFE_MEMCPY
  43
  44 #define copy_from_pc memcpy_fromio
  45 #define copy_to_pc memcpy_toio
  46
  47 static inline void copy_pc_to_user(void *to, const void *from, size_t n)
  48 {
  49     size_t odd = (n & 3);
  50     n -= odd;
  51     while (n) {
  52         put_user(readl_ns(from), (int *)to);
  53         (char *)from += 4; (char *)to += 4; n -= 4;
  54     }
  55     while (odd--)
  56         put_user(readb((char *)from++), (char *)to++);
  57 }
  58
  59 static inline void copy_user_to_pc(void *to, const void *from, size_t n)
  60 {
  61     int l;
  62     char c;
  63     size_t odd = (n & 3);
  64     n -= odd;
  65     while (n) {
  66         get_user(l, (int *)from);
  67         writel_ns(l, to);
  68         (char *)to += 4; (char *)from += 4; n -= 4;
  69     }
  70     while (odd--) {
  71         get_user(c, (char *)from++);
  72         writeb(c, (char *)to++);
  73     }
  74 }
  75
  76 #else /* UNSAFE_MEMCPY */
  77
  78 static inline void copy_from_pc(void *to, const void *from, size_t n)
  79 {
  80     size_t odd = (n & 1);
  81     n -= odd;
  82     while (n) {
  83         *(u_short *)to = __raw_readw(from);
  84         (char *)to += 2; (char *)from += 2; n -= 2;
  85     }
  86     if (odd)
  87         *(u_char *)to = readb(from);
  88 }
  89
  90 static inline void copy_to_pc(void *to, const void *from, size_t n)
  91 {
  92     size_t odd = (n & 1);
  93     n -= odd;
  94     while (n) {
  95         __raw_writew(*(u_short *)from, to);
  96         (char *)to += 2; (char *)from += 2; n -= 2;
  97     }
  98     if (odd)
  99         writeb(*(u_char *)from, to);
 100 }
 101
 102 static inline void copy_pc_to_user(void *to, const void *from, size_t n)
 103 {
 104     size_t odd = (n & 1);
 105     n -= odd;
 106     while (n) {
 107         put_user(__raw_readw(from), (short *)to);
 108         (char *)to += 2; (char *)from += 2; n -= 2;
 109     }
 110     if (odd)
 111         put_user(readb(from), (char *)to);
 112 }
 113
 114 static inline void copy_user_to_pc(void *to, const void *from, size_t n)
 115 {
 116     short s;
 117     char c;
 118     size_t odd = (n & 1);
 119     n -= odd;
 120     while (n) {
 121         get_user(s, (short *)from);
 122         __raw_writew(s, to);
 123         (char *)to += 2; (char *)from += 2; n -= 2;
 124     }
 125     if (odd) {
 126         get_user(c, (char *)from);
 127         writeb(c, to);
 128     }
 129 }
 130
 131 #endif /* UNSAFE_MEMCPY */
 132
 133 #endif /* _LINUX_MEM_OP_H */