1 /*- 2 * Copyright (c) 2009 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <stand.h> 28 #include <sys/param.h> 29 #include <sys/endian.h> 30 #include <sys/queue.h> 31 #include <machine/stdarg.h> 32 33 #include "bootstrap.h" 34 35 #define MD_BLOCK_SIZE 512 36 37 #ifndef MD_IMAGE_SIZE 38 #error Must be compiled with MD_IMAGE_SIZE defined 39 #endif 40 #if (MD_IMAGE_SIZE == 0 || MD_IMAGE_SIZE % MD_BLOCK_SIZE) 41 #error Image size must be a multiple of 512. 42 #endif 43 44 /* 45 * Preloaded image gets put here. 46 * Applications that patch the object with the image can determine 47 * the size looking at the start and end markers (strings), 48 * so we want them contiguous. 49 */ 50 static struct { 51 u_char start[MD_IMAGE_SIZE]; 52 u_char end[128]; 53 } md_image = { 54 .start = "MFS Filesystem goes here", 55 .end = "MFS Filesystem had better STOP here", 56 }; 57 58 /* devsw I/F */ 59 static int md_init(void); 60 static int md_strategy(void *, int, daddr_t, size_t, char *, size_t *); 61 static int md_open(struct open_file *, ...); 62 static int md_close(struct open_file *); 63 static int md_print(int); 64 65 struct devsw md_dev = { 66 .dv_name = "md", 67 .dv_type = DEVT_DISK, 68 .dv_init = md_init, 69 .dv_strategy = md_strategy, 70 .dv_open = md_open, 71 .dv_close = md_close, 72 .dv_ioctl = noioctl, 73 .dv_print = md_print, 74 .dv_cleanup = nullsys, 75 }; 76 77 static int 78 md_init(void) 79 { 80 81 return (0); 82 } 83 84 static int 85 md_strategy(void *devdata, int rw, daddr_t blk, size_t size, 86 char *buf, size_t *rsize) 87 { 88 struct devdesc *dev = (struct devdesc *)devdata; 89 size_t ofs; 90 91 if (dev->d_unit != 0) 92 return (ENXIO); 93 94 if (blk < 0 || blk >= (MD_IMAGE_SIZE / MD_BLOCK_SIZE)) 95 return (EIO); 96 97 if (size % MD_BLOCK_SIZE) 98 return (EIO); 99 100 ofs = blk * MD_BLOCK_SIZE; 101 if ((ofs + size) > MD_IMAGE_SIZE) 102 size = MD_IMAGE_SIZE - ofs; 103 104 if (rsize != NULL) 105 *rsize = size; 106 107 switch (rw & F_MASK) { 108 case F_READ: 109 bcopy(md_image.start + ofs, buf, size); 110 return (0); 111 case F_WRITE: 112 bcopy(buf, md_image.start + ofs, size); 113 return (0); 114 } 115 116 return (ENODEV); 117 } 118 119 static int 120 md_open(struct open_file *f, ...) 121 { 122 va_list ap; 123 struct devdesc *dev; 124 125 va_start(ap, f); 126 dev = va_arg(ap, struct devdesc *); 127 va_end(ap); 128 129 if (dev->d_unit != 0) 130 return (ENXIO); 131 132 return (0); 133 } 134 135 static int 136 md_close(struct open_file *f) 137 { 138 struct devdesc *dev; 139 140 dev = (struct devdesc *)(f->f_devdata); 141 return ((dev->d_unit != 0) ? ENXIO : 0); 142 } 143 144 static int 145 md_print(int verbose) 146 { 147 148 printf("%s devices:", md_dev.dv_name); 149 if (pager_output("\n") != 0) 150 return (1); 151 152 printf("MD (%u bytes)", MD_IMAGE_SIZE); 153 return (pager_output("\n")); 154 } 155