bsd/dev/ppc/nvram.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * BSD driver for Non-volatile RAM.
  30  * Stub functions call the real thing in the Platform Expert.
  31  *
  32  * Suurballe 11 Feb 1999
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/param.h>
  37
  38 extern int PEnvopen ( dev_t, int, int, struct proc * );
  39 extern int PEnvclose ( dev_t, int, int, struct proc * );
  40 extern int PEnvread ( long, int, unsigned char *);
  41 extern int PEnvwrite ( long, int, unsigned char * );
  42
  43
  44 nvopen(dev, flag, devtype, pp)
  45         dev_t dev;
  46         int flag, devtype;
  47         struct proc *pp;
  48 {
  49     return PEnvopen(dev,flag,devtype,pp);
  50 }
  51
  52
  53
  54 nvclose(dev, flag, mode, pp)
  55         dev_t dev;
  56         int flag, mode;
  57         struct proc *pp;
  58 {
  59     return PEnvclose(dev,flag,mode,pp);
  60 }
  61
  62
  63
  64 nvread(dev, uio, ioflag)
  65         dev_t dev;
  66         struct uio *uio;
  67         int ioflag;
  68 {
  69     long offset;
  70     long size;
  71     int c;
  72     unsigned char cc;
  73     long        read = 0;
  74     int error = 0;
  75
  76     offset = uio->uio_offset;
  77     size = uio_resid(uio);
  78
  79     for (read = 0; read < size; read++, offset++)  {
  80         error = PEnvread(offset, 1, &cc);
  81         if ( error ) {
  82             return error;
  83         }
  84         c = (int)cc;
  85         error = ureadc(c, uio);
  86         if (error) {
  87             return error;
  88         }
  89     }
  90     return error;
  91 }
  92
  93
  94
  95 nvwrite(dev_t dev,  struct uio *uio, int ioflag)
  96 {
  97         long offset;
  98         long size;
  99         int c;
 100         unsigned char cc;
 101         long    wrote = 0;
 102         int error = 0;
 103
 104         offset = uio->uio_offset;
 105         size = uio_resid(uio);
 106
 107         for (wrote = 0; wrote < size; wrote++, offset++) {
 108             c = uwritec(uio);
 109             if (c < 0) {
 110                 return 0;
 111             }
 112             cc = (unsigned char)c;
 113             error = PEnvwrite(offset, 1, &cc);
 114         }
 115         return error;
 116 }