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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> |
2445 | decky | 54 | #include "rd.h" |
1999 | decky | 55 | |
2475 | jermar | 56 | /** Pointer to the ramdisk's image. */ |
2445 | decky | 57 | static void *rd_addr; |
2478 | jermar | 58 | /** Size of the ramdisk. */ |
59 | static size_t rd_size; |
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1999 | decky | 60 | |
2475 | jermar | 61 | /** |
62 | * This futex protects the ramdisk's data. |
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63 | * If we were to serve multiple requests (read + write or several writes) |
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64 | * concurrently (i.e. from two or more threads), each read and write needs to be |
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65 | * protected by this futex. |
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66 | */ |
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67 | atomic_t rd_futex = FUTEX_INITIALIZER; |
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68 | |||
69 | /** Handle one connection to ramdisk. |
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70 | * |
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71 | * @param iid Hash of the request that opened the connection. |
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72 | * @param icall Call data of the request that opened the connection. |
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73 | */ |
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1999 | decky | 74 | static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
75 | { |
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76 | ipc_callid_t callid; |
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77 | ipc_call_t call; |
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78 | int retval; |
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2478 | jermar | 79 | void *fs_va = NULL; |
2445 | decky | 80 | ipcarg_t offset; |
1999 | decky | 81 | |
2475 | jermar | 82 | /* |
83 | * We allocate VA for communication per connection. |
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84 | * This allows us to potentionally have more clients and work |
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85 | * concurrently. |
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86 | */ |
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87 | fs_va = as_get_mappable_page(ALIGN_UP(BLOCK_SIZE, PAGE_SIZE)); |
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88 | if (!fs_va) { |
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89 | /* |
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90 | * Hang up the phone if we cannot proceed any further. |
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91 | * This is the answer to the call that opened the connection. |
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92 | */ |
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93 | ipc_answer_fast(iid, EHANGUP, 0, 0); |
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94 | return; |
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95 | } else { |
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96 | /* |
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97 | * Answer the first IPC_M_CONNECT_ME_TO call. |
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98 | * Return supported block size as ARG1. |
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99 | */ |
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100 | ipc_answer_fast(iid, EOK, BLOCK_SIZE, 0); |
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101 | } |
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102 | |||
103 | /* |
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104 | * Now we wait for the client to send us its communication as_area. |
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105 | */ |
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106 | callid = async_get_call(&call); |
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107 | if (IPC_GET_METHOD(call) == IPC_M_AS_AREA_SEND) { |
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108 | if (IPC_GET_ARG1(call) >= (ipcarg_t) BLOCK_SIZE) { |
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109 | /* |
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110 | * The client sends an as_area that can absorb the whole |
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111 | * block. |
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112 | */ |
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113 | ipc_answer_fast(callid, EOK, (uintptr_t) fs_va, 0); |
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114 | } else { |
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115 | /* |
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116 | * The client offered as_area too small. |
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117 | * Close the connection. |
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118 | */ |
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119 | ipc_answer_fast(callid, EHANGUP, 0, 0); |
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120 | return; |
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121 | } |
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122 | } else { |
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123 | /* |
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124 | * The client doesn't speak the same protocol. |
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125 | * At this point we can't handle protocol variations. |
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126 | * Close the connection. |
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127 | */ |
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128 | ipc_answer_fast(callid, EHANGUP, 0, 0); |
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129 | return; |
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130 | } |
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131 | |||
1999 | decky | 132 | while (1) { |
133 | callid = async_get_call(&call); |
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134 | switch (IPC_GET_METHOD(call)) { |
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2471 | jermar | 135 | case IPC_M_PHONE_HUNGUP: |
2475 | jermar | 136 | /* |
137 | * The other side has hung up. |
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138 | * Answer the message and exit the pseudo thread. |
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139 | */ |
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140 | ipc_answer_fast(callid, EOK, 0, 0); |
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2471 | jermar | 141 | return; |
2475 | jermar | 142 | case RD_READ_BLOCK: |
2471 | jermar | 143 | offset = IPC_GET_ARG1(call); |
2478 | jermar | 144 | if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) { |
145 | /* |
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146 | * Reading past the end of the device. |
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147 | */ |
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148 | retval = ELIMIT; |
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149 | break; |
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150 | } |
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2475 | jermar | 151 | futex_down(&rd_futex); |
2478 | jermar | 152 | memcpy(fs_va, rd_addr + offset, BLOCK_SIZE); |
2475 | jermar | 153 | futex_up(&rd_futex); |
2471 | jermar | 154 | retval = EOK; |
155 | break; |
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2475 | jermar | 156 | case RD_WRITE_BLOCK: |
157 | offset = IPC_GET_ARG1(call); |
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2478 | jermar | 158 | if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) { |
159 | /* |
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160 | * Writing past the end of the device. |
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161 | */ |
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162 | retval = ELIMIT; |
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163 | break; |
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164 | } |
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2475 | jermar | 165 | futex_up(&rd_futex); |
2478 | jermar | 166 | memcpy(rd_addr + offset, fs_va, BLOCK_SIZE); |
2475 | jermar | 167 | futex_down(&rd_futex); |
168 | retval = EOK; |
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169 | break; |
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2471 | jermar | 170 | default: |
2475 | jermar | 171 | /* |
172 | * The client doesn't speak the same protocol. |
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173 | * Instead of closing the connection, we just ignore |
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174 | * the call. This can be useful if the client uses a |
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175 | * newer version of the protocol. |
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176 | */ |
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2471 | jermar | 177 | retval = EINVAL; |
2475 | jermar | 178 | break; |
1999 | decky | 179 | } |
180 | ipc_answer_fast(callid, retval, 0, 0); |
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2471 | jermar | 181 | } |
1999 | decky | 182 | } |
183 | |||
2475 | jermar | 184 | /** Prepare the ramdisk image for operation. */ |
2005 | decky | 185 | static bool rd_init(void) |
1999 | decky | 186 | { |
2445 | decky | 187 | int retval, flags; |
188 | |||
2478 | jermar | 189 | rd_size = sysinfo_value("rd.size"); |
2471 | jermar | 190 | void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical"); |
1999 | decky | 191 | |
2005 | decky | 192 | if (rd_size == 0) |
193 | return false; |
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1999 | decky | 194 | |
2445 | decky | 195 | rd_addr = as_get_mappable_page(rd_size); |
2005 | decky | 196 | |
2445 | decky | 197 | flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE; |
2471 | jermar | 198 | retval = physmem_map(rd_ph_addr, rd_addr, |
199 | ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
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2445 | decky | 200 | |
201 | if (retval < 0) |
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202 | return false; |
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2005 | decky | 203 | return true; |
204 | } |
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1999 | decky | 205 | |
2005 | decky | 206 | int main(int argc, char **argv) |
207 | { |
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208 | if (rd_init()) { |
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209 | ipcarg_t phonead; |
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210 | |||
211 | async_set_client_connection(rd_connection); |
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212 | |||
213 | /* Register service at nameserver */ |
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214 | if (ipc_connect_to_me(PHONE_NS, SERVICE_RD, 0, &phonead) != 0) |
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215 | return -1; |
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216 | |||
217 | async_manager(); |
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218 | |||
219 | /* Never reached */ |
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220 | return 0; |
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221 | } |
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222 | |||
223 | return -1; |
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1999 | decky | 224 | } |
225 | |||
226 | /** |
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227 | * @} |
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228 | */ |