scoutos / prex-0.9.0 / sys / kern / system.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * system.c - system services
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32 | */
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33 | |||
34 | #include <kernel.h> |
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35 | #include <thread.h> |
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36 | #include <sched.h> |
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37 | #include <task.h> |
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38 | #include <vm.h> |
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39 | #include <irq.h> |
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40 | #include <page.h> |
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41 | #include <device.h> |
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42 | #include <system.h> |
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43 | #include <hal.h> |
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44 | #include <sys/dbgctl.h> |
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45 | |||
46 | static char infobuf[MAXINFOSZ]; /* common information buffer */ |
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47 | |||
48 | static const struct kerninfo kerninfo = { |
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49 | "Prex", HOSTNAME, VERSION, __DATE__, MACHINE
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50 | }; |
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51 | |||
52 | /*
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53 | * Get system information.
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54 | */
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55 | int
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56 | sysinfo(int type, void *buf) |
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57 | { |
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58 | int error = 0; |
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59 | |||
60 | sched_lock(); |
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61 | |||
62 | switch (type) {
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63 | case INFO_KERNEL:
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64 | memcpy(buf, &kerninfo, sizeof(kerninfo));
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65 | break;
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66 | case INFO_MEMORY:
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67 | page_info(buf); |
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68 | break;
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69 | case INFO_TIMER:
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70 | timer_info(buf); |
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71 | break;
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72 | case INFO_THREAD:
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73 | error = thread_info(buf); |
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74 | break;
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75 | case INFO_DEVICE:
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76 | error = device_info(buf); |
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77 | break;
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78 | case INFO_TASK:
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79 | error = task_info(buf); |
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80 | break;
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81 | case INFO_VM:
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82 | error = vm_info(buf); |
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83 | break;
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84 | case INFO_IRQ:
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85 | error = irq_info(buf); |
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86 | break;
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87 | default:
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88 | error = EINVAL; |
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89 | break;
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90 | } |
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91 | sched_unlock(); |
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92 | return error;
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93 | } |
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94 | |||
95 | /*
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96 | * System call to get system information.
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97 | */
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98 | int
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99 | sys_info(int type, void *buf) |
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100 | { |
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101 | int error;
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102 | size_t bufsz = 0;
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103 | |||
104 | if (buf == NULL || !user_area(buf)) |
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105 | return EFAULT;
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106 | |||
107 | sched_lock(); |
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108 | |||
109 | switch (type) {
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110 | case INFO_KERNEL:
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111 | bufsz = sizeof(struct kerninfo); |
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112 | break;
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113 | case INFO_MEMORY:
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114 | bufsz = sizeof(struct meminfo); |
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115 | break;
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116 | case INFO_TIMER:
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117 | bufsz = sizeof(struct timerinfo); |
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118 | break;
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119 | case INFO_THREAD:
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120 | bufsz = sizeof(struct threadinfo); |
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121 | break;
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122 | case INFO_DEVICE:
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123 | bufsz = sizeof(struct devinfo); |
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124 | break;
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125 | case INFO_TASK:
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126 | bufsz = sizeof(struct taskinfo); |
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127 | break;
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128 | case INFO_VM:
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129 | bufsz = sizeof(struct vminfo); |
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130 | break;
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131 | case INFO_IRQ:
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132 | bufsz = sizeof(struct irqinfo); |
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133 | break;
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134 | default:
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135 | sched_unlock(); |
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136 | return EINVAL;
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137 | } |
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138 | |||
139 | error = copyin(buf, &infobuf, bufsz); |
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140 | if (!error) {
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141 | error = sysinfo(type, &infobuf); |
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142 | if (!error) {
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143 | error = copyout(&infobuf, buf, bufsz); |
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144 | } |
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145 | } |
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146 | sched_unlock(); |
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147 | return error;
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148 | } |
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149 | |||
150 | /*
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151 | * Logging system call.
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152 | *
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153 | * Write a message to the logging device. The log
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154 | * function is available only when kernel is built
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155 | * with debug option.
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156 | */
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157 | int
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158 | sys_log(const char *str) |
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159 | { |
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160 | #ifdef DEBUG
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161 | char buf[DBGMSGSZ];
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162 | |||
163 | if (copyinstr(str, buf, DBGMSGSZ))
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164 | return EINVAL;
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165 | |||
166 | printf("%s", buf);
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167 | return 0; |
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168 | #else
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169 | return ENOSYS;
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170 | #endif
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171 | } |
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172 | |||
173 | /*
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174 | * Kernel debug service.
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175 | */
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176 | int
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177 | sys_debug(int cmd, void *data) |
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178 | { |
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179 | #ifdef DEBUG
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180 | int error = EINVAL;
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181 | task_t task = 0;
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182 | |||
183 | switch (cmd) {
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184 | case DBGC_LOGSIZE:
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185 | case DBGC_GETLOG:
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186 | error = dbgctl(cmd, data); |
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187 | break;
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188 | case DBGC_TRACE:
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189 | task = (task_t)data; |
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190 | if (!task_valid(task)) {
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191 | error = ESRCH; |
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192 | break;
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193 | } |
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194 | dbgctl(cmd, (void *)task);
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195 | error = 0;
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196 | break;
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197 | } |
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198 | return error;
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199 | #else
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200 | return ENOSYS;
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201 | #endif
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202 | } |
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203 | |||
204 | /*
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205 | * Panic system call.
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206 | */
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207 | int
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208 | sys_panic(const char *str) |
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209 | { |
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210 | #ifdef DEBUG
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211 | char buf[DBGMSGSZ];
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212 | |||
213 | sched_lock(); |
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214 | copyinstr(str, buf, DBGMSGSZ - 20);
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215 | printf("User panic: %s\n", str);
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216 | printf(" task=%s thread=%lx\n", curtask->name, (long)curthread); |
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217 | |||
218 | machine_abort(); |
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219 | /* NOTREACHED */
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220 | #else
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221 | task_terminate(curtask); |
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222 | #endif
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223 | return 0; |
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224 | } |
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225 | |||
226 | /*
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227 | * Get system time - return ticks since OS boot.
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228 | */
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229 | int
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230 | sys_time(u_long *ticks) |
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231 | { |
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232 | u_long t; |
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233 | |||
234 | t = timer_ticks(); |
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235 | return copyout(&t, ticks, sizeof(t)); |
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236 | } |
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237 | |||
238 | /*
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239 | * nonexistent system call.
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240 | */
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241 | int
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242 | sys_nosys(void)
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243 | { |
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244 | return EINVAL;
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245 | } |