sys/arch/acorn32/dev/md_hooks.c

   1 /*      $NetBSD: md_hooks.c,v 1.9 2009/03/14 14:45:51 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 1.9 2009/03/14 14:45:51 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 }