The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/md_root.c

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    1 /*      $NetBSD: md_root.c,v 1.10 2003/04/29 01:52:59 thorpej Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Gordon W. Ross.
    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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.10 2003/04/29 01:52:59 thorpej Exp $");
   41 
   42 #include "opt_md.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/reboot.h>
   47 
   48 #include <dev/md.h>
   49 
   50 extern int boothowto;
   51 
   52 #ifdef MEMORY_DISK_DYNAMIC
   53 #ifdef MEMORY_DISK_IMAGE
   54 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
   55 #endif
   56 size_t md_root_size;
   57 char *md_root_image;
   58 #else /* MEMORY_DISK_DYNAMIC */
   59 
   60 #ifdef MEMORY_DISK_IMAGE
   61 #ifdef MEMORY_DISK_ROOT_SIZE
   62 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
   63 #endif
   64 char md_root_image[] = {
   65 #include "md_root_image.h"
   66 };
   67 u_int32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
   68 
   69 #else /* MEMORY_DISK_IMAGE */
   70 
   71 #ifndef MEMORY_DISK_ROOT_SIZE
   72 #define MEMORY_DISK_ROOT_SIZE 512
   73 #endif
   74 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
   75 
   76 /*
   77  * This array will be patched to contain a file-system image.
   78  * See the program mdsetimage(8) for details.
   79  */
   80 u_int32_t md_root_size = ROOTBYTES;
   81 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
   82 #endif /* MEMORY_DISK_IMAGE */
   83 #endif /* MEMORY_DISK_DYNAMIC */
   84 
   85 #ifndef MEMORY_RBFLAGS
   86 #define MEMORY_RBFLAGS  RB_SINGLE       /* force single user */
   87 #endif
   88 
   89 #ifdef MEMORY_DISK_DYNAMIC
   90 void
   91 md_root_setconf(char *addr, size_t size)
   92 {
   93         md_root_image = addr;
   94         md_root_size = size;
   95 }
   96 #endif /* MEMORY_DISK_DYNAMIC */
   97 
   98 /*
   99  * This is called during pseudo-device attachment.
  100  */
  101 void
  102 md_attach_hook(int unit, struct md_conf *md)
  103 {
  104         char pbuf[9];
  105 
  106         if (unit == 0) {
  107                 /* Setup root ramdisk */
  108                 md->md_addr = (caddr_t)md_root_image;
  109                 md->md_size = (size_t)md_root_size;
  110                 md->md_type = MD_KMEM_FIXED;
  111                 format_bytes(pbuf, sizeof(pbuf), md->md_size);
  112                 aprint_normal("md%d: internal %s image area\n", unit, pbuf);
  113         }
  114 }
  115 
  116 /*
  117  * This is called during open (i.e. mountroot)
  118  */
  119 void
  120 md_open_hook(int unit, struct md_conf *md)
  121 {
  122 
  123         if (unit == 0) {
  124                 /* The root ramdisk only works single-user. */
  125                 boothowto |= MEMORY_RBFLAGS;
  126         }
  127 }

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