sys/dev/md_root.c

   1 /*      $NetBSD: md_root.c,v 1.12 2006/11/16 01:32:45 christos 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 1.12 2006/11/16 01:32:45 christos 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 = (void *)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 }