sys/dev/md_root.c

   1 /*      $NetBSD: md_root.c,v 1.16 2009/02/06 18:50:29 jym 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 1.16 2009/02/06 18:50:29 jym 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 #ifdef MEMORY_DISK_DYNAMIC
  44 #ifdef MEMORY_DISK_IMAGE
  45 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
  46 #endif
  47 size_t md_root_size;
  48 char *md_root_image;
  49 #else /* MEMORY_DISK_DYNAMIC */
  50
  51 #ifdef MEMORY_DISK_IMAGE
  52 #ifdef MEMORY_DISK_ROOT_SIZE
  53 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
  54 #endif
  55 char md_root_image[] = {
  56 #include "md_root_image.h"
  57 };
  58 uint32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
  59
  60 #else /* MEMORY_DISK_IMAGE */
  61
  62 #ifndef MEMORY_DISK_ROOT_SIZE
  63 #define MEMORY_DISK_ROOT_SIZE 512
  64 #endif
  65 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
  66
  67 /*
  68  * This array will be patched to contain a file-system image.
  69  * See the program mdsetimage(8) for details.
  70  */
  71 uint32_t md_root_size = ROOTBYTES;
  72 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
  73 #endif /* MEMORY_DISK_IMAGE */
  74 #endif /* MEMORY_DISK_DYNAMIC */
  75
  76 #ifndef MEMORY_DISK_RBFLAGS
  77 #define MEMORY_DISK_RBFLAGS     RB_AUTOBOOT     /* default boot mode */
  78 #endif
  79
  80 #ifdef MEMORY_DISK_DYNAMIC
  81 void
  82 md_root_setconf(char *addr, size_t size)
  83 {
  84
  85         md_is_root = 1;
  86         md_root_image = addr;
  87         md_root_size = size;
  88 }
  89 #endif /* MEMORY_DISK_DYNAMIC */
  90
  91 /*
  92  * This is called during pseudo-device attachment.
  93  */
  94 #define PBUFLEN sizeof("99999 KB")
  95
  96 void
  97 md_attach_hook(int unit, struct md_conf *md)
  98 {
  99         char pbuf[PBUFLEN];
 100
 101         if (unit == 0 && md_is_root) {
 102                 /* Setup root ramdisk */
 103                 md->md_addr = (void *)md_root_image;
 104                 md->md_size = (size_t)md_root_size;
 105                 md->md_type = MD_KMEM_FIXED;
 106                 format_bytes(pbuf, sizeof(pbuf), md->md_size);
 107                 aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
 108         }
 109 }
 110
 111 /*
 112  * This is called during open (i.e. mountroot)
 113  */
 114 void
 115 md_open_hook(int unit, struct md_conf *md)
 116 {
 117
 118         if (unit == 0 && md_is_root) {
 119                 boothowto |= MEMORY_DISK_RBFLAGS;
 120         }
 121 }