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