bsd/dev/ppc/nvram.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * BSD driver for Non-volatile RAM.
  27  * Stub functions call the real thing in the Platform Expert.
  28  *
  29  * Suurballe 11 Feb 1999
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34
  35 extern int PEnvopen ( dev_t, int, int, struct proc * );
  36 extern int PEnvclose ( dev_t, int, int, struct proc * );
  37 extern int PEnvread ( long, int, unsigned char *);
  38 extern int PEnvwrite ( long, int, unsigned char * );
  39
  40
  41 nvopen(dev, flag, devtype, pp)
  42         dev_t dev;
  43         int flag, devtype;
  44         struct proc *pp;
  45 {
  46     return PEnvopen(dev,flag,devtype,pp);
  47 }
  48
  49
  50
  51 nvclose(dev, flag, mode, pp)
  52         dev_t dev;
  53         int flag, mode;
  54         struct proc *pp;
  55 {
  56     return PEnvclose(dev,flag,mode,pp);
  57 }
  58
  59
  60
  61 nvread(dev, uio, ioflag)
  62         dev_t dev;
  63         struct uio *uio;
  64         int ioflag;
  65 {
  66     long offset;
  67     long size;
  68     int c;
  69     unsigned char cc;
  70     long        read = 0;
  71     int error = 0;
  72
  73     offset = uio->uio_offset;
  74     size = uio->uio_resid;
  75
  76     for (read = 0; read < size; read++, offset++)  {
  77         error = PEnvread(offset, 1, &cc);
  78         if ( error ) {
  79             return error;
  80         }
  81         c = (int)cc;
  82         error = ureadc(c, uio);
  83         if (error) {
  84             return error;
  85         }
  86     }
  87     return error;
  88 }
  89
  90
  91
  92 nvwrite(dev_t dev,  struct uio *uio, int ioflag)
  93 {
  94         register struct iovec *iov;
  95         long offset;
  96         long size;
  97         int c;
  98         unsigned char cc;
  99         long    wrote = 0;
 100         int error = 0;
 101
 102         offset = uio->uio_offset;
 103         size = uio->uio_resid;
 104
 105         for (wrote = 0; wrote < size; wrote++, offset++) {
 106             c = uwritec(uio);
 107             if (c < 0) {
 108                 return 0;
 109             }
 110             cc = (unsigned char)c;
 111             error = PEnvwrite(offset, 1, &cc);
 112         }
 113         return error;
 114 }