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

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    1 /*      $NetBSD: md_root.c,v 1.15 2008/05/02 13:02:31 ad 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  *
   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 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.15 2008/05/02 13:02:31 ad Exp $");
   34 
   35 #include "opt_md.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/reboot.h>
   40 
   41 #include <dev/md.h>
   42 
   43 extern int boothowto;
   44 
   45 #ifdef MEMORY_DISK_DYNAMIC
   46 #ifdef MEMORY_DISK_IMAGE
   47 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
   48 #endif
   49 size_t md_root_size;
   50 char *md_root_image;
   51 #else /* MEMORY_DISK_DYNAMIC */
   52 
   53 #ifdef MEMORY_DISK_IMAGE
   54 #ifdef MEMORY_DISK_ROOT_SIZE
   55 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
   56 #endif
   57 char md_root_image[] = {
   58 #include "md_root_image.h"
   59 };
   60 u_int32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
   61 
   62 #else /* MEMORY_DISK_IMAGE */
   63 
   64 #ifndef MEMORY_DISK_ROOT_SIZE
   65 #define MEMORY_DISK_ROOT_SIZE 512
   66 #endif
   67 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
   68 
   69 /*
   70  * This array will be patched to contain a file-system image.
   71  * See the program mdsetimage(8) for details.
   72  */
   73 u_int32_t md_root_size = ROOTBYTES;
   74 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
   75 #endif /* MEMORY_DISK_IMAGE */
   76 #endif /* MEMORY_DISK_DYNAMIC */
   77 
   78 #ifndef MEMORY_RBFLAGS
   79 #define MEMORY_RBFLAGS  RB_SINGLE       /* force single user */
   80 #endif
   81 
   82 #ifdef MEMORY_DISK_DYNAMIC
   83 void
   84 md_root_setconf(char *addr, size_t size)
   85 {
   86         md_is_root = 1;
   87         md_root_image = addr;
   88         md_root_size = size;
   89 }
   90 #endif /* MEMORY_DISK_DYNAMIC */
   91 
   92 /*
   93  * This is called during pseudo-device attachment.
   94  */
   95 void
   96 md_attach_hook(int unit, struct md_conf *md)
   97 {
   98         char pbuf[9];
   99 
  100         if (unit == 0 && md_is_root) {
  101                 /* Setup root ramdisk */
  102                 md->md_addr = (void *)md_root_image;
  103                 md->md_size = (size_t)md_root_size;
  104                 md->md_type = MD_KMEM_FIXED;
  105                 format_bytes(pbuf, sizeof(pbuf), md->md_size);
  106                 aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
  107         }
  108 }
  109 
  110 /*
  111  * This is called during open (i.e. mountroot)
  112  */
  113 void
  114 md_open_hook(int unit, struct md_conf *md)
  115 {
  116 
  117         if (unit == 0 && md_is_root) {
  118                 /* The root ramdisk only works single-user. */
  119                 boothowto |= MEMORY_RBFLAGS;
  120         }
  121 }

Cache object: ea5f76a194dd31d65a6a009ca107fe52


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