/*      $NetBSD: bootyy.c,v 1.5 2009/01/12 07:00:59 tsutsui Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*/

/*
* This is a generic "first-stage" boot program.
*
* Note that this program has absolutely no filesystem knowledge!
*
* Instead, this uses a table of disk block numbers that are
* filled in by the installboot program such that this program
* can load the "second-stage" boot program.
*/

#include <sys/param.h>
#include <sys/time.h>
#include <sys/exec.h>
#include <machine/mon.h>

#include <stand.h>
#include "libsa.h"

int copyboot(struct open_file *, char *);

/* This determines the largest boot program we can load. */
#define MAXBLOCKNUM     64

/*
* The block size used in the Sun Network Disk protocol.
*/
#define SUNND_BSIZE (512)

/*
* The first block number we request.  This is related to historical
* values; in 4.2BSD, the disklabel and the first stage boot program
* are together called the bootblocks, and take up the first BBSIZE
* bytes of the disk.  In 4.2BSD, BBSIZE was 8192 and the disk device
* block size was 512 bytes (see the definition of SUNND_BSIZE below),
* making the number of blocks taken up by the bootblocks (BBSIZE /
* SUNND_BSIZE).  This value for FIRSTBLOCKNUM assumes that the
* second-stage boot begins immediately after the bootblocks.  The
* second-stage boot always runs contiguously for MAXBLOCKNUM blocks.
* FIRSTBLOCKNUM can be increased, and MAXBLOCKNUM can be adjusted, as
* long as they match up with however you're putting together the disk
* image that is being served to this client.
*/
#define FIRSTBLOCKNUM (8192 / SUNND_BSIZE)

int             block_size = SUNND_BSIZE;       /* default */

int
main(void)
{
       struct open_file        f;
       void    *entry;
       char    *addr;
       int error;

#ifdef DEBUG
       printf("bootyy: open...\n");
#endif
       f.f_flags = F_RAW;
       if (devopen(&f, 0, &addr)) {
               printf("bootyy: devopen failed\n");
               return 1;
       }

       addr = (char *)KERN_LOADADDR;
       error = copyboot(&f, addr);
       f.f_dev->dv_close(&f);
       if (!error) {
#ifdef DEBUG
               printf("bootyy: start 0x%x\n", (long)addr);
#endif
               entry = addr;
               chain_to(entry);
       }
       /* copyboot had a problem... */
       return 0;
}

int
copyboot(struct open_file *fp, char *addr)
{
       size_t n;
       int i, blknum;
       char *buf;

       /* Need to use a buffer that can be mapped into DVMA space. */
       buf = alloc(block_size);
       if (!buf)
               panic("bootyy: alloc failed");

       for (i = 0, blknum = FIRSTBLOCKNUM; i < MAXBLOCKNUM; i++, blknum++) {

#ifdef DEBUG
               printf("bootyy: block # %d = %d\n", i, blknum);
#endif
               if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
                                          blknum, block_size, buf, &n))
               {
                       printf("bootyy: read failed\n");
                       return -1;
               }
               if (n != block_size) {
                       printf("bootyy: short read\n");
                       return -1;
               }
               memcpy(addr, buf, block_size);
               addr += block_size;
       }

       return 0;
}