boot/common/md.c

199767f8919635c4928607450d9e0abb932109ceToomas Soome/*-
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 2009 Marcel Moolenaar
199767f8919635c4928607450d9e0abb932109ceToomas Soome * All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * are met:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/cdefs.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome__FBSDID("$FreeBSD$");
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <stand.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/param.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/endian.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/queue.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <machine/stdarg.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include "bootstrap.h"
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define MD_BLOCK_SIZE   512
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifndef MD_IMAGE_SIZE
199767f8919635c4928607450d9e0abb932109ceToomas Soome#error Must be compiled with MD_IMAGE_SIZE defined
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome#if (MD_IMAGE_SIZE == 0 || MD_IMAGE_SIZE % MD_BLOCK_SIZE)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#error Image size must be a multiple of 512.
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome/*
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Preloaded image gets put here.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Applications that patch the object with the image can determine
199767f8919635c4928607450d9e0abb932109ceToomas Soome * the size looking at the start and end markers (strings),
199767f8919635c4928607450d9e0abb932109ceToomas Soome * so we want them contiguous.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic struct {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    u_char start[MD_IMAGE_SIZE];
199767f8919635c4928607450d9e0abb932109ceToomas Soome    u_char end[128];
199767f8919635c4928607450d9e0abb932109ceToomas Soome} md_image = {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    .start = "MFS Filesystem goes here",
199767f8919635c4928607450d9e0abb932109ceToomas Soome    .end = "MFS Filesystem had better STOP here",
199767f8919635c4928607450d9e0abb932109ceToomas Soome};
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome/* devsw I/F */
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int md_init(void);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int md_strategy(void *, int, daddr_t, size_t, char *, size_t *);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int md_open(struct open_file *, ...);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int md_close(struct open_file *);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic void md_print(int);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestruct devsw md_dev = {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    "md",
199767f8919635c4928607450d9e0abb932109ceToomas Soome    DEVT_DISK,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    md_init,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    md_strategy,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    md_open,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    md_close,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    noioctl,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    md_print
199767f8919635c4928607450d9e0abb932109ceToomas Soome};
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomemd_init(void)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return (0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomemd_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    size_t *rsize)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct devdesc *dev = (struct devdesc *)devdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    size_t ofs;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (dev->d_unit != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (ENXIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (blk < 0 || blk >= (MD_IMAGE_SIZE / MD_BLOCK_SIZE))
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (size % MD_BLOCK_SIZE)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    ofs = blk * MD_BLOCK_SIZE;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((ofs + size) > MD_IMAGE_SIZE)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        size = MD_IMAGE_SIZE - ofs;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (rsize != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        *rsize = size;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    switch (rw) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    case F_READ:
199767f8919635c4928607450d9e0abb932109ceToomas Soome        bcopy(md_image.start + ofs, buf, size);
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    case F_WRITE:
199767f8919635c4928607450d9e0abb932109ceToomas Soome        bcopy(buf, md_image.start + ofs, size);
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return (ENODEV);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomemd_open(struct open_file *f, ...)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    va_list ap;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct devdesc *dev;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    va_start(ap, f);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    dev = va_arg(ap, struct devdesc *);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    va_end(ap);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (dev->d_unit != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return (ENXIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return (0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomemd_close(struct open_file *f)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct devdesc *dev;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    dev = (struct devdesc *)(f->f_devdata);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return ((dev->d_unit != 0) ? ENXIO : 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic void
199767f8919635c4928607450d9e0abb932109ceToomas Soomemd_print(int verbose)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    printf("MD (%u bytes)\n", MD_IMAGE_SIZE);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}