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md_root.c revision 1.17 
      1 /*	$NetBSD: md_root.c,v 1.17 2009/04/16 14:46:33 tsutsui 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 1.17 2009/04/16 14:46:33 tsutsui 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 }
    122