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4419 | trochtova | 1 | /* |
2 | * Copyright (c) 2007 Michal Konopa |
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3 | * Copyright (c) 2007 Martin Jelen |
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4 | * Copyright (c) 2007 Peter Majer |
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5 | * Copyright (c) 2007 Jakub Jermar |
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6 | * All rights reserved. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * |
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12 | * - Redistributions of source code must retain the above copyright |
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13 | * notice, this list of conditions and the following disclaimer. |
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14 | * - Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * - The name of the author may not be used to endorse or promote products |
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18 | * derived from this software without specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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21 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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22 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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23 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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24 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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29 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
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31 | |||
32 | /** @addtogroup rd |
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33 | * @{ |
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34 | */ |
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35 | |||
36 | /** |
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37 | * @file rd.c |
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38 | * @brief Initial RAM disk for HelenOS. |
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39 | */ |
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40 | |||
41 | #include <ipc/ipc.h> |
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42 | #include <ipc/services.h> |
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43 | #include <ipc/ns.h> |
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44 | #include <sysinfo.h> |
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45 | #include <as.h> |
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46 | #include <ddi.h> |
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47 | #include <align.h> |
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48 | #include <bool.h> |
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49 | #include <errno.h> |
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50 | #include <async.h> |
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51 | #include <align.h> |
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52 | #include <async.h> |
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53 | #include <futex.h> |
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54 | #include <stdio.h> |
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4420 | trochtova | 55 | #include <devmap.h> |
56 | #include <ipc/bd.h> |
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4419 | trochtova | 57 | |
58 | #define NAME "rd" |
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59 | |||
60 | /** Pointer to the ramdisk's image. */ |
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61 | static void *rd_addr; |
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62 | /** Size of the ramdisk. */ |
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63 | static size_t rd_size; |
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64 | |||
65 | /** |
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66 | * This futex protects the ramdisk's data. |
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67 | * If we were to serve multiple requests (read + write or several writes) |
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68 | * concurrently (i.e. from two or more threads), each read and write needs to be |
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69 | * protected by this futex. |
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70 | */ |
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71 | atomic_t rd_futex = FUTEX_INITIALIZER; |
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72 | |||
73 | /** Handle one connection to ramdisk. |
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74 | * |
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75 | * @param iid Hash of the request that opened the connection. |
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76 | * @param icall Call data of the request that opened the connection. |
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77 | */ |
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78 | static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
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79 | { |
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80 | ipc_callid_t callid; |
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81 | ipc_call_t call; |
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82 | int retval; |
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83 | void *fs_va = NULL; |
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84 | off_t offset; |
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85 | size_t block_size; |
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86 | size_t maxblock_size; |
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87 | |||
88 | /* |
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89 | * Answer the first IPC_M_CONNECT_ME_TO call. |
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90 | */ |
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91 | ipc_answer_0(iid, EOK); |
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92 | |||
93 | /* |
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94 | * Now we wait for the client to send us its communication as_area. |
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95 | */ |
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96 | int flags; |
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97 | if (ipc_share_out_receive(&callid, &maxblock_size, &flags)) { |
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98 | fs_va = as_get_mappable_page(maxblock_size); |
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99 | if (fs_va) { |
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100 | (void) ipc_share_out_finalize(callid, fs_va); |
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101 | } else { |
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102 | ipc_answer_0(callid, EHANGUP); |
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103 | return; |
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104 | } |
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105 | } else { |
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106 | /* |
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107 | * The client doesn't speak the same protocol. |
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108 | * At this point we can't handle protocol variations. |
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109 | * Close the connection. |
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110 | */ |
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111 | ipc_answer_0(callid, EHANGUP); |
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112 | return; |
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113 | } |
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114 | |||
4420 | trochtova | 115 | while (true) { |
4419 | trochtova | 116 | callid = async_get_call(&call); |
117 | switch (IPC_GET_METHOD(call)) { |
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118 | case IPC_M_PHONE_HUNGUP: |
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119 | /* |
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120 | * The other side has hung up. |
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121 | * Answer the message and exit the fibril. |
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122 | */ |
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123 | ipc_answer_0(callid, EOK); |
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124 | return; |
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4420 | trochtova | 125 | case BD_READ_BLOCK: |
4419 | trochtova | 126 | offset = IPC_GET_ARG1(call); |
127 | block_size = IPC_GET_ARG2(call); |
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128 | if (block_size > maxblock_size) { |
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129 | /* |
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130 | * Maximum block size exceeded. |
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131 | */ |
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132 | retval = ELIMIT; |
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133 | break; |
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134 | } |
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135 | if (offset * block_size > rd_size - block_size) { |
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136 | /* |
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137 | * Reading past the end of the device. |
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138 | */ |
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139 | retval = ELIMIT; |
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140 | break; |
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141 | } |
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142 | futex_down(&rd_futex); |
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143 | memcpy(fs_va, rd_addr + offset * block_size, block_size); |
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144 | futex_up(&rd_futex); |
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145 | retval = EOK; |
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146 | break; |
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4420 | trochtova | 147 | case BD_WRITE_BLOCK: |
4419 | trochtova | 148 | offset = IPC_GET_ARG1(call); |
149 | block_size = IPC_GET_ARG2(call); |
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150 | if (block_size > maxblock_size) { |
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151 | /* |
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152 | * Maximum block size exceeded. |
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153 | */ |
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154 | retval = ELIMIT; |
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155 | break; |
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156 | } |
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157 | if (offset * block_size > rd_size - block_size) { |
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158 | /* |
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159 | * Writing past the end of the device. |
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160 | */ |
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161 | retval = ELIMIT; |
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162 | break; |
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163 | } |
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164 | futex_up(&rd_futex); |
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165 | memcpy(rd_addr + offset * block_size, fs_va, block_size); |
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166 | futex_down(&rd_futex); |
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167 | retval = EOK; |
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168 | break; |
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169 | default: |
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170 | /* |
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171 | * The client doesn't speak the same protocol. |
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172 | * Instead of closing the connection, we just ignore |
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173 | * the call. This can be useful if the client uses a |
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174 | * newer version of the protocol. |
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175 | */ |
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176 | retval = EINVAL; |
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177 | break; |
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178 | } |
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179 | ipc_answer_0(callid, retval); |
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180 | } |
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181 | } |
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182 | |||
183 | /** Prepare the ramdisk image for operation. */ |
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184 | static bool rd_init(void) |
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185 | { |
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186 | rd_size = sysinfo_value("rd.size"); |
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187 | void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical"); |
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188 | |||
189 | if (rd_size == 0) { |
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190 | printf(NAME ": No RAM disk found\n"); |
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191 | return false; |
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192 | } |
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193 | |||
194 | rd_addr = as_get_mappable_page(rd_size); |
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195 | |||
196 | int flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE; |
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197 | int retval = physmem_map(rd_ph_addr, rd_addr, |
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198 | ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
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199 | |||
200 | if (retval < 0) { |
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201 | printf(NAME ": Error mapping RAM disk\n"); |
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202 | return false; |
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203 | } |
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204 | |||
205 | printf(NAME ": Found RAM disk at %p, %d bytes\n", rd_ph_addr, rd_size); |
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206 | |||
4420 | trochtova | 207 | int rc = devmap_driver_register(NAME, rd_connection); |
208 | if (rc < 0) { |
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209 | printf(NAME ": Unable to register driver (%d)\n", rc); |
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4419 | trochtova | 210 | return false; |
211 | } |
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212 | |||
4420 | trochtova | 213 | dev_handle_t dev_handle; |
214 | if (devmap_device_register("initrd", &dev_handle) != EOK) { |
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215 | devmap_hangup_phone(DEVMAP_DRIVER); |
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4419 | trochtova | 216 | printf(NAME ": Unable to register device\n"); |
217 | return false; |
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218 | } |
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219 | |||
220 | return true; |
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221 | } |
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222 | |||
223 | int main(int argc, char **argv) |
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224 | { |
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225 | printf(NAME ": HelenOS RAM disk server\n"); |
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226 | |||
227 | if (!rd_init()) |
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228 | return -1; |
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229 | |||
230 | printf(NAME ": Accepting connections\n"); |
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231 | async_manager(); |
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232 | |||
233 | /* Never reached */ |
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234 | return 0; |
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235 | } |
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236 | |||
237 | /** |
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238 | * @} |
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4420 | trochtova | 239 | */ |