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Rev | Author | Line No. | Line |
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1999 | decky | 1 | /* |
2445 | decky | 2 | * Copyright (c) 2007 Michal Konopa |
3 | * Copyright (c) 2007 Martin Jelen |
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4 | * Copyright (c) 2007 Peter Majer |
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2475 | jermar | 5 | * Copyright (c) 2007 Jakub Jermar |
1999 | decky | 6 | * All rights reserved. |
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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2005 | decky | 44 | #include <sysinfo.h> |
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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1999 | decky | 49 | #include <errno.h> |
50 | #include <async.h> |
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2445 | decky | 51 | #include <align.h> |
52 | #include <async.h> |
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2475 | jermar | 53 | #include <futex.h> |
3085 | decky | 54 | #include <stdio.h> |
55 | #include <ipc/devmap.h> |
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2445 | decky | 56 | #include "rd.h" |
1999 | decky | 57 | |
3085 | decky | 58 | #define NAME "rd" |
59 | |||
2475 | jermar | 60 | /** Pointer to the ramdisk's image. */ |
2445 | decky | 61 | static void *rd_addr; |
2478 | jermar | 62 | /** Size of the ramdisk. */ |
63 | static size_t rd_size; |
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1999 | decky | 64 | |
2475 | jermar | 65 | /** |
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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1999 | decky | 78 | static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
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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2478 | jermar | 83 | void *fs_va = NULL; |
3254 | jermar | 84 | off_t offset; |
85 | size_t block_size; |
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86 | size_t maxblock_size; |
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1999 | decky | 87 | |
2475 | jermar | 88 | /* |
3254 | jermar | 89 | * Answer the first IPC_M_CONNECT_ME_TO call. |
2475 | jermar | 90 | */ |
3254 | jermar | 91 | ipc_answer_0(iid, EOK); |
2475 | jermar | 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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3085 | decky | 96 | int flags; |
3254 | jermar | 97 | if (ipc_share_out_receive(&callid, &maxblock_size, &flags)) { |
98 | fs_va = as_get_mappable_page(maxblock_size); |
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99 | if (fs_va) { |
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2678 | jermar | 100 | (void) ipc_share_out_finalize(callid, fs_va); |
2475 | jermar | 101 | } else { |
2619 | jermar | 102 | ipc_answer_0(callid, EHANGUP); |
2475 | jermar | 103 | return; |
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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2619 | jermar | 111 | ipc_answer_0(callid, EHANGUP); |
2475 | jermar | 112 | return; |
113 | } |
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114 | |||
1999 | decky | 115 | while (1) { |
116 | callid = async_get_call(&call); |
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117 | switch (IPC_GET_METHOD(call)) { |
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2471 | jermar | 118 | case IPC_M_PHONE_HUNGUP: |
2475 | jermar | 119 | /* |
120 | * The other side has hung up. |
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2518 | jermar | 121 | * Answer the message and exit the fibril. |
2475 | jermar | 122 | */ |
2619 | jermar | 123 | ipc_answer_0(callid, EOK); |
2471 | jermar | 124 | return; |
2475 | jermar | 125 | case RD_READ_BLOCK: |
2471 | jermar | 126 | offset = IPC_GET_ARG1(call); |
3254 | jermar | 127 | block_size = IPC_GET_ARG2(call); |
128 | if (block_size > maxblock_size) { |
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2478 | jermar | 129 | /* |
3254 | jermar | 130 | * Maximum block size exceeded. |
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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2478 | jermar | 137 | * Reading past the end of the device. |
138 | */ |
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139 | retval = ELIMIT; |
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140 | break; |
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141 | } |
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2475 | jermar | 142 | futex_down(&rd_futex); |
3254 | jermar | 143 | memcpy(fs_va, rd_addr + offset * block_size, block_size); |
2475 | jermar | 144 | futex_up(&rd_futex); |
2471 | jermar | 145 | retval = EOK; |
146 | break; |
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2475 | jermar | 147 | case RD_WRITE_BLOCK: |
148 | offset = IPC_GET_ARG1(call); |
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3254 | jermar | 149 | block_size = IPC_GET_ARG2(call); |
150 | if (block_size > maxblock_size) { |
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2478 | jermar | 151 | /* |
3254 | jermar | 152 | * Maximum block size exceeded. |
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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2478 | jermar | 159 | * Writing past the end of the device. |
160 | */ |
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161 | retval = ELIMIT; |
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162 | break; |
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163 | } |
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2475 | jermar | 164 | futex_up(&rd_futex); |
3254 | jermar | 165 | memcpy(rd_addr + offset * block_size, fs_va, block_size); |
2475 | jermar | 166 | futex_down(&rd_futex); |
167 | retval = EOK; |
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168 | break; |
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2471 | jermar | 169 | default: |
2475 | jermar | 170 | /* |
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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2471 | jermar | 176 | retval = EINVAL; |
2475 | jermar | 177 | break; |
1999 | decky | 178 | } |
2619 | jermar | 179 | ipc_answer_0(callid, retval); |
2471 | jermar | 180 | } |
1999 | decky | 181 | } |
182 | |||
3085 | decky | 183 | static int driver_register(char *name) |
184 | { |
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185 | ipcarg_t retval; |
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186 | aid_t req; |
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187 | ipc_call_t answer; |
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188 | int phone; |
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189 | ipcarg_t callback_phonehash; |
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190 | |||
4005 | decky | 191 | phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP, DEVMAP_DRIVER, 0); |
192 | if (phone < 0) { |
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193 | printf(NAME ": Failed to connect to device mapper\n"); |
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194 | return -1; |
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3085 | decky | 195 | } |
196 | |||
197 | req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer); |
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198 | |||
4264 | svoboda | 199 | retval = ipc_data_write_start(phone, (char *) name, str_size(name) + 1); |
3085 | decky | 200 | |
201 | if (retval != EOK) { |
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202 | async_wait_for(req, NULL); |
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203 | return -1; |
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204 | } |
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205 | |||
206 | async_set_client_connection(rd_connection); |
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207 | |||
208 | ipc_connect_to_me(phone, 0, 0, 0, &callback_phonehash); |
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209 | async_wait_for(req, &retval); |
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210 | |||
211 | return phone; |
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212 | } |
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213 | |||
214 | static int device_register(int driver_phone, char *name, int *handle) |
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215 | { |
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216 | ipcarg_t retval; |
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217 | aid_t req; |
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218 | ipc_call_t answer; |
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219 | |||
220 | req = async_send_2(driver_phone, DEVMAP_DEVICE_REGISTER, 0, 0, &answer); |
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221 | |||
4264 | svoboda | 222 | retval = ipc_data_write_start(driver_phone, (char *) name, |
223 | str_size(name) + 1); |
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3085 | decky | 224 | |
225 | if (retval != EOK) { |
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226 | async_wait_for(req, NULL); |
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227 | return retval; |
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228 | } |
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229 | |||
230 | async_wait_for(req, &retval); |
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231 | |||
232 | if (handle != NULL) |
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233 | *handle = -1; |
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234 | |||
235 | if (EOK == retval) { |
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236 | if (NULL != handle) |
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237 | *handle = (int) IPC_GET_ARG1(answer); |
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238 | } |
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239 | |||
240 | return retval; |
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241 | } |
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242 | |||
2475 | jermar | 243 | /** Prepare the ramdisk image for operation. */ |
2005 | decky | 244 | static bool rd_init(void) |
1999 | decky | 245 | { |
2478 | jermar | 246 | rd_size = sysinfo_value("rd.size"); |
2471 | jermar | 247 | void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical"); |
1999 | decky | 248 | |
3085 | decky | 249 | if (rd_size == 0) { |
250 | printf(NAME ": No RAM disk found\n"); |
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2005 | decky | 251 | return false; |
3085 | decky | 252 | } |
1999 | decky | 253 | |
2445 | decky | 254 | rd_addr = as_get_mappable_page(rd_size); |
2005 | decky | 255 | |
3085 | decky | 256 | int flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE; |
257 | int retval = physmem_map(rd_ph_addr, rd_addr, |
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2471 | jermar | 258 | ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
3908 | decky | 259 | |
3085 | decky | 260 | if (retval < 0) { |
261 | printf(NAME ": Error mapping RAM disk\n"); |
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2445 | decky | 262 | return false; |
3085 | decky | 263 | } |
264 | |||
265 | printf(NAME ": Found RAM disk at %p, %d bytes\n", rd_ph_addr, rd_size); |
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266 | |||
267 | int driver_phone = driver_register(NAME); |
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268 | if (driver_phone < 0) { |
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269 | printf(NAME ": Unable to register driver\n"); |
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270 | return false; |
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271 | } |
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272 | |||
273 | int dev_handle; |
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274 | if (EOK != device_register(driver_phone, "initrd", &dev_handle)) { |
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275 | ipc_hangup(driver_phone); |
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276 | printf(NAME ": Unable to register device\n"); |
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277 | return false; |
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278 | } |
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4374 | jermar | 279 | |
280 | /* |
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281 | * Create the second device. |
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282 | * We need at least two devices for the sake of testing of non-root |
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283 | * mounts. Of course it would be better to allow the second device |
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284 | * be created dynamically... |
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285 | */ |
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286 | if (EOK != device_register(driver_phone, "spared", &dev_handle)) { |
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287 | ipc_hangup(driver_phone); |
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288 | printf(NAME ": Unable to register device\n"); |
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289 | return false; |
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290 | } |
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3085 | decky | 291 | |
2005 | decky | 292 | return true; |
293 | } |
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1999 | decky | 294 | |
2005 | decky | 295 | int main(int argc, char **argv) |
296 | { |
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3085 | decky | 297 | printf(NAME ": HelenOS RAM disk server\n"); |
2005 | decky | 298 | |
3085 | decky | 299 | if (!rd_init()) |
300 | return -1; |
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301 | |||
302 | printf(NAME ": Accepting connections\n"); |
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303 | async_manager(); |
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304 | |||
305 | /* Never reached */ |
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306 | return 0; |
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1999 | decky | 307 | } |
308 | |||
309 | /** |
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310 | * @} |
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311 | */ |