152 lines
3.5 KiB
C
152 lines
3.5 KiB
C
/*-
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* Copyright (c) 2009 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stand.h>
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/queue.h>
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#include <machine/stdarg.h>
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#include "bootstrap.h"
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#define MD_BLOCK_SIZE 512
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#ifndef MD_IMAGE_SIZE
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#error Must be compiled with MD_IMAGE_SIZE defined
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#endif
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#if (MD_IMAGE_SIZE == 0 || MD_IMAGE_SIZE % MD_BLOCK_SIZE)
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#error Image size must be a multiple of 512.
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#endif
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/*
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* Preloaded image gets put here.
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* Applications that patch the object with the image can determine
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* the size looking at the start and end markers (strings),
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* so we want them contiguous.
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*/
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static struct {
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u_char start[MD_IMAGE_SIZE];
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u_char end[128];
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} md_image = {
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.start = "MFS Filesystem goes here",
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.end = "MFS Filesystem had better STOP here",
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};
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/* devsw I/F */
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static int md_init(void);
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static int md_strategy(void *, int, daddr_t, size_t, char *, size_t *);
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static int md_open(struct open_file *, ...);
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static int md_close(struct open_file *);
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static void md_print(int);
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struct devsw md_dev = {
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"md",
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DEVT_DISK,
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md_init,
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md_strategy,
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md_open,
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md_close,
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noioctl,
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md_print
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};
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static int
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md_init(void)
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{
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return (0);
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}
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static int
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md_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
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size_t *rsize)
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{
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struct devdesc *dev = (struct devdesc *)devdata;
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size_t ofs;
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if (dev->d_unit != 0)
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return (ENXIO);
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if (blk < 0 || blk >= (MD_IMAGE_SIZE / MD_BLOCK_SIZE))
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return (EIO);
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if (size % MD_BLOCK_SIZE)
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return (EIO);
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ofs = blk * MD_BLOCK_SIZE;
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if ((ofs + size) > MD_IMAGE_SIZE)
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size = MD_IMAGE_SIZE - ofs;
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if (rsize != 0)
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*rsize = size;
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switch (rw) {
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case F_READ:
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bcopy(md_image.start + ofs, buf, size);
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return (0);
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case F_WRITE:
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bcopy(buf, md_image.start + ofs, size);
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return (0);
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}
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return (ENODEV);
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}
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static int
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md_open(struct open_file *f, ...)
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{
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va_list ap;
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struct devdesc *dev;
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va_start(ap, f);
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dev = va_arg(ap, struct devdesc *);
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va_end(ap);
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if (dev->d_unit != 0)
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return (ENXIO);
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return (0);
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}
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static int
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md_close(struct open_file *f)
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{
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struct devdesc *dev;
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dev = (struct devdesc *)(f->f_devdata);
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return ((dev->d_unit != 0) ? ENXIO : 0);
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}
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static void
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md_print(int verbose)
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{
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printf("MD (%u bytes)\n", MD_IMAGE_SIZE);
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}
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