FreeBSD/Linux Kernel Cross Reference
sys/dev/md_root.c

     /*      $NetBSD: md_root.c,v 1.19 2015/08/30 05:24:03 uebayasi Exp $    */
     
     /*-
      * Copyright (c) 1996 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Gordon W. Ross.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.19 2015/08/30 05:24:03 uebayasi Exp $");
    
    #include "opt_md.h"
    #include "opt_memory_disk_image.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/reboot.h>
    
    #include <dev/md.h>
    
    #ifdef MEMORY_DISK_DYNAMIC
    #ifdef makeoptions_MEMORY_DISK_IMAGE
    #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
    #endif
    size_t md_root_size;
    char *md_root_image;
    #else /* MEMORY_DISK_DYNAMIC */
    
    #ifdef makeoptions_MEMORY_DISK_IMAGE
    #ifdef MEMORY_DISK_ROOT_SIZE
    #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
    #endif
    char md_root_image[] = {
    #include "md_root_image.h"
    };
    uint32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
    
    #else /* makeoptions_MEMORY_DISK_IMAGE */
    
    #ifndef MEMORY_DISK_ROOT_SIZE
    #define MEMORY_DISK_ROOT_SIZE 512
    #endif
    #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
    
    /*
     * This array will be patched to contain a file-system image.
     * See the program mdsetimage(8) for details.
     */
    uint32_t md_root_size = ROOTBYTES;
    char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
    #endif /* makeoptions_MEMORY_DISK_IMAGE */
    #endif /* MEMORY_DISK_DYNAMIC */
    
    #ifndef MEMORY_DISK_RBFLAGS
    #define MEMORY_DISK_RBFLAGS     RB_AUTOBOOT     /* default boot mode */
    #endif
    
    #ifdef MEMORY_DISK_DYNAMIC
    void
    md_root_setconf(char *addr, size_t size)
    {
    
            md_is_root = 1;
            md_root_image = addr;
            md_root_size = size;
    }
    #endif /* MEMORY_DISK_DYNAMIC */
    
    /*
     * This is called during pseudo-device attachment.
     */
    #define PBUFLEN sizeof("99999 KB")
    
    void
    md_attach_hook(int unit, struct md_conf *md)
    {
           char pbuf[PBUFLEN];
   
           if (unit == 0 && md_is_root) {
                   /* Setup root ramdisk */
                   md->md_addr = (void *)md_root_image;
                   md->md_size = (size_t)md_root_size;
                   md->md_type = MD_KMEM_FIXED;
                   format_bytes(pbuf, sizeof(pbuf), md->md_size);
                   aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
           }
   }
   
   /*
    * This is called during open (i.e. mountroot)
    */
   void
   md_open_hook(int unit, struct md_conf *md)
   {
   
           if (unit == 0 && md_is_root) {
                   boothowto |= MEMORY_DISK_RBFLAGS;
           }
   }

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