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      1 /*	$NetBSD: md_root.c,v 1.19 2015/08/30 05:24:03 uebayasi 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 1.19 2015/08/30 05:24:03 uebayasi Exp $");
     34 
     35 #include "opt_md.h"
     36 #include "opt_memory_disk_image.h"
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/reboot.h>
     41 
     42 #include <dev/md.h>
     43 
     44 #ifdef MEMORY_DISK_DYNAMIC
     45 #ifdef makeoptions_MEMORY_DISK_IMAGE
     46 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
     47 #endif
     48 size_t md_root_size;
     49 char *md_root_image;
     50 #else /* MEMORY_DISK_DYNAMIC */
     51 
     52 #ifdef makeoptions_MEMORY_DISK_IMAGE
     53 #ifdef MEMORY_DISK_ROOT_SIZE
     54 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
     55 #endif
     56 char md_root_image[] = {
     57 #include "md_root_image.h"
     58 };
     59 uint32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
     60 
     61 #else /* makeoptions_MEMORY_DISK_IMAGE */
     62 
     63 #ifndef MEMORY_DISK_ROOT_SIZE
     64 #define MEMORY_DISK_ROOT_SIZE 512
     65 #endif
     66 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
     67 
     68 /*
     69  * This array will be patched to contain a file-system image.
     70  * See the program mdsetimage(8) for details.
     71  */
     72 uint32_t md_root_size = ROOTBYTES;
     73 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
     74 #endif /* makeoptions_MEMORY_DISK_IMAGE */
     75 #endif /* MEMORY_DISK_DYNAMIC */
     76 
     77 #ifndef MEMORY_DISK_RBFLAGS
     78 #define MEMORY_DISK_RBFLAGS	RB_AUTOBOOT	/* default boot mode */
     79 #endif
     80 
     81 #ifdef MEMORY_DISK_DYNAMIC
     82 void
     83 md_root_setconf(char *addr, size_t size)
     84 {
     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 #define PBUFLEN	sizeof("99999 KB")
     96 
     97 void
     98 md_attach_hook(int unit, struct md_conf *md)
     99 {
    100 	char pbuf[PBUFLEN];
    101 
    102 	if (unit == 0 && md_is_root) {
    103 		/* Setup root ramdisk */
    104 		md->md_addr = (void *)md_root_image;
    105 		md->md_size = (size_t)md_root_size;
    106 		md->md_type = MD_KMEM_FIXED;
    107 		format_bytes(pbuf, sizeof(pbuf), md->md_size);
    108 		aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
    109 	}
    110 }
    111 
    112 /*
    113  * This is called during open (i.e. mountroot)
    114  */
    115 void
    116 md_open_hook(int unit, struct md_conf *md)
    117 {
    118 
    119 	if (unit == 0 && md_is_root) {
    120 		boothowto |= MEMORY_DISK_RBFLAGS;
    121 	}
    122 }
    123