FreeBSD/Linux Kernel Cross Reference
sys/include/pcmcia/mem_op.h

     /*
      * mem_op.h 1.13 2000/06/12 21:55:40
      *
      * The contents of this file are subject to the Mozilla Public License
      * Version 1.1 (the "License"); you may not use this file except in
      * compliance with the License. You may obtain a copy of the License
      * at http://www.mozilla.org/MPL/
      *
      * Software distributed under the License is distributed on an "AS IS"
     * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
     * the License for the specific language governing rights and
     * limitations under the License. 
     *
     * The initial developer of the original code is David A. Hinds
     * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
     * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
     *
     * Alternatively, the contents of this file may be used under the
     * terms of the GNU General Public License version 2 (the "GPL"), in which
     * case the provisions of the GPL are applicable instead of the
     * above.  If you wish to allow the use of your version of this file
     * only under the terms of the GPL and not to allow others to use
     * your version of this file under the MPL, indicate your decision by
     * deleting the provisions above and replace them with the notice and
     * other provisions required by the GPL.  If you do not delete the
     * provisions above, a recipient may use your version of this file
     * under either the MPL or the GPL.
     */
    
    #ifndef _LINUX_MEM_OP_H
    #define _LINUX_MEM_OP_H
    
    #include <asm/uaccess.h>
    
    /*
       If UNSAFE_MEMCPY is defined, we use the (optimized) system routines
       to copy between a card and kernel memory.  These routines do 32-bit
       operations which may not work with all PCMCIA controllers.  The
       safe versions defined here will do only 8-bit and 16-bit accesses.
    */
    
    #ifdef UNSAFE_MEMCPY
    
    #define copy_from_pc memcpy_fromio
    #define copy_to_pc memcpy_toio
    
    static inline void copy_pc_to_user(void *to, const void *from, size_t n)
    {
        size_t odd = (n & 3);
        n -= odd;
        while (n) {
            put_user(__raw_readl(from), (int *)to);
            (char *)from += 4; (char *)to += 4; n -= 4;
        }
        while (odd--)
            put_user(readb((char *)from++), (char *)to++);
    }
    
    static inline void copy_user_to_pc(void *to, const void *from, size_t n)
    {
        int l;
        char c;
        size_t odd = (n & 3);
        n -= odd;
        while (n) {
            get_user(l, (int *)from);
            __raw_writel(l, to);
            (char *)to += 4; (char *)from += 4; n -= 4;
        }
        while (odd--) {
            get_user(c, (char *)from++);
            writeb(c, (char *)to++);
        }
    }
    
    #else /* UNSAFE_MEMCPY */
    
    static inline void copy_from_pc(void *to, const void *from, size_t n)
    {
        size_t odd = (n & 1);
        n -= odd;
        while (n) {
            *(u_short *)to = __raw_readw(from);
            (char *)to += 2; (char *)from += 2; n -= 2;
        }
        if (odd)
            *(u_char *)to = readb(from);
    }
    
    static inline void copy_to_pc(void *to, const void *from, size_t n)
    {
        size_t odd = (n & 1);
        n -= odd;
        while (n) {
            __raw_writew(*(u_short *)from, to);
            (char *)to += 2; (char *)from += 2; n -= 2;
        }
        if (odd)
            writeb(*(u_char *)from, to);
   }
   
   static inline void copy_pc_to_user(void *to, const void *from, size_t n)
   {
       size_t odd = (n & 1);
       n -= odd;
       while (n) {
           put_user(__raw_readw(from), (short *)to);
           (char *)to += 2; (char *)from += 2; n -= 2;
       }
       if (odd)
           put_user(readb(from), (char *)to);
   }
   
   static inline void copy_user_to_pc(void *to, const void *from, size_t n)
   {
       short s;
       char c;
       size_t odd = (n & 1);
       n -= odd;
       while (n) {
           get_user(s, (short *)from);
           __raw_writew(s, to);
           (char *)to += 2; (char *)from += 2; n -= 2;
       }
       if (odd) {
           get_user(c, (char *)from);
           writeb(c, to);
       }
   }
   
   #endif /* UNSAFE_MEMCPY */
   
   #endif /* _LINUX_MEM_OP_H */

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