3a4661b9b4
Submitted by: Zakary Nafziger <worldofzak@gmail.com> Sponsored by: The FreeBSD Foundation
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/*-
|
|
* Copyright (c) 2009 Marcel Moolenaar
|
|
* All rights reserved.
|
|
*
|
|
* 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 AUTHOR 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 AUTHOR 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <stand.h>
|
|
#include <sys/param.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/queue.h>
|
|
#include <machine/stdarg.h>
|
|
|
|
#include "bootstrap.h"
|
|
|
|
#define MD_BLOCK_SIZE 512
|
|
|
|
#ifndef MD_IMAGE_SIZE
|
|
#error Must be compiled with MD_IMAGE_SIZE defined
|
|
#endif
|
|
#if (MD_IMAGE_SIZE == 0 || MD_IMAGE_SIZE % MD_BLOCK_SIZE)
|
|
#error Image size must be a multiple of 512.
|
|
#endif
|
|
|
|
/*
|
|
* Preloaded image gets put here.
|
|
* Applications that patch the object with the image can determine
|
|
* the size looking at the start and end markers (strings),
|
|
* so we want them contiguous.
|
|
*/
|
|
static struct {
|
|
u_char start[MD_IMAGE_SIZE];
|
|
u_char end[128];
|
|
} md_image = {
|
|
.start = "MFS Filesystem goes here",
|
|
.end = "MFS Filesystem had better STOP here",
|
|
};
|
|
|
|
/* devsw I/F */
|
|
static int md_init(void);
|
|
static int md_strategy(void *, int, daddr_t, size_t, char *, size_t *);
|
|
static int md_open(struct open_file *, ...);
|
|
static int md_close(struct open_file *);
|
|
static int md_print(int);
|
|
|
|
struct devsw md_dev = {
|
|
"md",
|
|
DEVT_DISK,
|
|
md_init,
|
|
md_strategy,
|
|
md_open,
|
|
md_close,
|
|
noioctl,
|
|
md_print,
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
md_init(void)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
md_strategy(void *devdata, int rw, daddr_t blk, size_t size,
|
|
char *buf, size_t *rsize)
|
|
{
|
|
struct devdesc *dev = (struct devdesc *)devdata;
|
|
size_t ofs;
|
|
|
|
if (dev->d_unit != 0)
|
|
return (ENXIO);
|
|
|
|
if (blk < 0 || blk >= (MD_IMAGE_SIZE / MD_BLOCK_SIZE))
|
|
return (EIO);
|
|
|
|
if (size % MD_BLOCK_SIZE)
|
|
return (EIO);
|
|
|
|
ofs = blk * MD_BLOCK_SIZE;
|
|
if ((ofs + size) > MD_IMAGE_SIZE)
|
|
size = MD_IMAGE_SIZE - ofs;
|
|
|
|
if (rsize != NULL)
|
|
*rsize = size;
|
|
|
|
switch (rw & F_MASK) {
|
|
case F_READ:
|
|
bcopy(md_image.start + ofs, buf, size);
|
|
return (0);
|
|
case F_WRITE:
|
|
bcopy(buf, md_image.start + ofs, size);
|
|
return (0);
|
|
}
|
|
|
|
return (ENODEV);
|
|
}
|
|
|
|
static int
|
|
md_open(struct open_file *f, ...)
|
|
{
|
|
va_list ap;
|
|
struct devdesc *dev;
|
|
|
|
va_start(ap, f);
|
|
dev = va_arg(ap, struct devdesc *);
|
|
va_end(ap);
|
|
|
|
if (dev->d_unit != 0)
|
|
return (ENXIO);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
md_close(struct open_file *f)
|
|
{
|
|
struct devdesc *dev;
|
|
|
|
dev = (struct devdesc *)(f->f_devdata);
|
|
return ((dev->d_unit != 0) ? ENXIO : 0);
|
|
}
|
|
|
|
static int
|
|
md_print(int verbose)
|
|
{
|
|
|
|
printf("%s devices:", md_dev.dv_name);
|
|
if (pager_output("\n") != 0)
|
|
return (1);
|
|
|
|
printf("MD (%u bytes)", MD_IMAGE_SIZE);
|
|
return (pager_output("\n"));
|
|
}
|