sys/arch/ews4800mips/stand/common/fileread_ustarfs.c

   1 /*      $NetBSD: fileread_ustarfs.c,v 1.2 2006/08/26 14:13:40 tsutsui Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by UCHIYAMA Yasushi.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #ifdef _STANDALONE
  33 #include <lib/libsa/stand.h>
  34 #include <lib/libkern/libkern.h>
  35 #endif
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include "bootxx.h"
  40
  41 #include <machine/sector.h>
  42 #include <machine/sbd.h>
  43
  44 int ustar_size(const char *);
  45
  46 int
  47 fileread(const char *fname, size_t *size)
  48 {
  49         uint8_t *p = (void *)SDBOOT_PDINFOADDR;
  50
  51         if (dk_read(16, 1, p) != 0)
  52                 return BERR_TARHDR;
  53
  54         if (((*(uint32_t *)(p + 256)) & 0xffffff) != 0x757374)
  55                 return BERR_TARMAGIC;
  56
  57         *size = ustar_size((const char *)(p + 124));
  58         if (dk_read(17, ROUND_SECTOR(*size) >> DEV_BSHIFT,
  59             (void *)SDBOOT_SCRATCHADDR) != 0)
  60                 return BERR_RDFILE;
  61
  62         return 0;
  63 }
  64
  65 int
  66 ustar_size(const char *p)
  67 {
  68         int i, j, k;
  69
  70         for (i = 0, j = 0, k = 1, p += 10; i < 11; i++, p--, k *= 8)
  71                 j += (*p - '0') * k;
  72
  73         return j;
  74 }