1 /* $NetBSD: md_hooks.c,v 1.5 2003/07/14 22:48:24 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon W. Ross 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: md_hooks.c,v 1.5 2003/07/14 22:48:24 lukem Exp $"); 32 33 #include "opt_md.h" 34 35 #include <sys/param.h> 36 #include <sys/reboot.h> 37 #include <sys/device.h> 38 #include <sys/systm.h> 39 40 #include <uvm/uvm_extern.h> 41 42 #include <dev/md.h> 43 44 #ifdef MEMORY_DISK_ROOT_SIZE 45 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT) 46 47 /* 48 * This array will be patched to contain a file-system image. 49 * See the program: src/distrib/sun3/common/rdsetroot.c 50 */ 51 size_t md_root_size = ROOTBYTES; 52 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n"; 53 54 #else /* MEMORY_DISK_ROOT_SIZE */ 55 56 size_t md_root_size = 0; /* set by machdep.c */ 57 static struct md_conf *bootmd = NULL; 58 59 extern int load_memory_disc_from_floppy __P((struct md_conf *md, dev_t dev)); 60 61 #include "fdc.h" 62 #endif /* MEMORY_DISK_ROOT_SIZE */ 63 64 void 65 md_attach_hook(unit, md) 66 int unit; 67 struct md_conf *md; 68 { 69 if (unit == 0) { 70 #ifdef MEMORY_DISK_ROOT_SIZE 71 /* Setup root ramdisk */ 72 md->md_addr = (caddr_t) md_root_image; 73 md->md_size = (size_t) md_root_size; 74 md->md_type = MD_KMEM_FIXED; 75 #else /* MEMORY_DISK_ROOT_SIZE */ 76 #ifdef OLD_MEMORY_DISK_SIZE 77 if (md_root_size == 0 && OLD_MEMORY_DISK_SIZE) 78 md_root_size = (OLD_MEMORY_DISK_SIZE << DEV_BSHIFT); 79 #endif /* OLD_MEMORY_DISK_SIZE */ 80 if (md_root_size != 0) { 81 md->md_size = round_page(md_root_size); 82 md->md_addr = (caddr_t)uvm_km_zalloc(kernel_map, md_root_size); 83 md->md_type = MD_KMEM_FIXED; 84 bootmd = md; 85 } 86 #endif /* MEMORY_DISK_ROOT_SIZE */ 87 printf("md%d: allocated %ldK (%ld blocks)\n", unit, (long)md->md_size / 1024, (long)md->md_size / DEV_BSIZE); 88 } 89 } 90 91 92 /* 93 * This is called during open (i.e. mountroot) 94 */ 95 96 void 97 md_open_hook(unit, md) 98 int unit; 99 struct md_conf *md; 100 { 101 if (unit == 0) { 102 /* The root memory disk only works single-user. */ 103 boothowto |= RB_SINGLE; 104 #if !defined(MEMORY_DISK_ROOT_SIZE) && NFDC > 0 105 load_memory_disc_from_floppy(bootmd, makedev(17, 1)); /* XXX 1.44MB FD */ 106 #endif 107 } 108 } 109