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      1 /*	$NetBSD: md_hooks.c,v 1.10 2009/03/14 15:35:58 dsl 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 1.10 2009/03/14 15:35:58 dsl 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(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(int unit, struct md_conf *md)
     66 {
     67 	if (unit == 0) {
     68 #ifdef MEMORY_DISK_ROOT_SIZE
     69 		/* Setup root ramdisk */
     70 		md->md_addr = (void *) md_root_image;
     71 		md->md_size = (size_t)  md_root_size;
     72 		md->md_type = MD_KMEM_FIXED;
     73 #else	/* MEMORY_DISK_ROOT_SIZE */
     74 #ifdef OLD_MEMORY_DISK_SIZE
     75 		if (md_root_size == 0 && OLD_MEMORY_DISK_SIZE)
     76 			md_root_size = (OLD_MEMORY_DISK_SIZE << DEV_BSHIFT);
     77 #endif	/* OLD_MEMORY_DISK_SIZE */
     78 		if (md_root_size != 0) {
     79 			md->md_size = round_page(md_root_size);
     80 			md->md_addr = (void *)uvm_km_alloc(kernel_map,
     81 			    md_root_size, 0, UVM_KMF_WIRED | UVM_KMF_ZERO);
     82 			md->md_type = MD_KMEM_FIXED;
     83 			bootmd = md;
     84 		}
     85 #endif	/* MEMORY_DISK_ROOT_SIZE */
     86 		printf("md%d: allocated %ldK (%ld blocks)\n", unit, (long)md->md_size / 1024, (long)md->md_size / DEV_BSIZE);
     87 	}
     88 }
     89 
     90 
     91 /*
     92  * This is called during open (i.e. mountroot)
     93  */
     94 
     95 void
     96 md_open_hook(int unit, struct md_conf *md)
     97 {
     98 	if (unit == 0) {
     99 		/* The root memory disk only works single-user. */
    100 		boothowto |= RB_SINGLE;
    101 #if !defined(MEMORY_DISK_ROOT_SIZE) && NFDC > 0
    102 		load_memory_disc_from_floppy(bootmd, makedev(17, 1));	/* XXX 1.44MB FD */
    103 #endif
    104 	}
    105 }
    106