cmd/read.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  *
   6  * Alternatively, this software may be distributed under the terms of the
   7  * GNU General Public License ("GPL") version 2 as published by the Free
   8  * Software Foundation.
   9  */
  10
  11 #include <command.h>
  12 #include <mapmem.h>
  13 #include <part.h>
  14 #include <vsprintf.h>
  15
  16 static int
  17 do_rw(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  18 {
  19         struct blk_desc *dev_desc = NULL;
  20         struct disk_partition part_info;
  21         ulong offset, limit;
  22         uint blk, cnt, res;
  23         void *ptr;
  24         int part;
  25
  26         if (argc != 6) {
  27                 cmd_usage(cmdtp);
  28                 return 1;
  29         }
  30
  31         part = part_get_info_by_dev_and_name_or_num(argv[1], argv[2],
  32                                                     &dev_desc, &part_info, 1);
  33         if (part < 0)
  34                 return 1;
  35
  36         ptr = map_sysmem(hextoul(argv[3], NULL), 0);
  37         blk = hextoul(argv[4], NULL);
  38         cnt = hextoul(argv[5], NULL);
  39
  40         if (part > 0) {
  41                 offset = part_info.start;
  42                 limit = part_info.size;
  43         } else {
  44                 /* Largest address not available in struct blk_desc. */
  45                 offset = 0;
  46                 limit = ~0;
  47         }
  48
  49         if (cnt + blk > limit) {
  50                 printf("%s out of range\n", cmdtp->name);
  51                 unmap_sysmem(ptr);
  52                 return 1;
  53         }
  54
  55         if (IS_ENABLED(CONFIG_CMD_WRITE) && !strcmp(cmdtp->name, "write"))
  56                 res = blk_dwrite(dev_desc, offset + blk, cnt, ptr);
  57         else
  58                 res = blk_dread(dev_desc, offset + blk, cnt, ptr);
  59         unmap_sysmem(ptr);
  60
  61         if (res != cnt) {
  62                 printf("%s error\n", cmdtp->name);
  63                 return 1;
  64         }
  65
  66         return 0;
  67 }
  68
  69 #ifdef CONFIG_CMD_READ
  70 U_BOOT_CMD(
  71         read,   6,      0,      do_rw,
  72         "Load binary data from a partition",
  73         "<interface> <dev[:part|#partname]> addr blk# cnt"
  74 );
  75 #endif
  76
  77 #ifdef CONFIG_CMD_WRITE
  78 U_BOOT_CMD(
  79         write,  6,      0,      do_rw,
  80         "Store binary data to a partition",
  81         "<interface> <dev[:part|#partname]> addr blk# cnt"
  82 );
  83 #endif