1 | #include <freebsd/machine/rtems-bsd-config.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 2000,2001 Peter Wemm <peter@FreeBSD.org> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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26 | * SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <freebsd/sys/cdefs.h> |
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30 | __FBSDID("$FreeBSD$"); |
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31 | |
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32 | #include <freebsd/sys/param.h> |
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33 | #include <freebsd/sys/lock.h> |
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34 | #include <freebsd/sys/mutex.h> |
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35 | #include <freebsd/sys/systm.h> |
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36 | #include <freebsd/sys/bus.h> |
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37 | |
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38 | /* |
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39 | * Access functions for device resources. |
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40 | */ |
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41 | |
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42 | static int checkmethod = 1; |
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43 | static int use_kenv; |
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44 | static char *hintp; |
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45 | #ifdef __rtems__ |
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46 | char static_hints[] = {}; |
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47 | int hintmode = 2; |
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48 | #endif /* __rtems__ */ |
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49 | |
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50 | /* |
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51 | * Evil wildcarding resource string lookup. |
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52 | * This walks the supplied env string table and returns a match. |
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53 | * The start point can be remembered for incremental searches. |
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54 | */ |
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55 | static int |
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56 | res_find(int *line, int *startln, |
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57 | const char *name, int *unit, const char *resname, const char *value, |
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58 | const char **ret_name, int *ret_namelen, int *ret_unit, |
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59 | const char **ret_resname, int *ret_resnamelen, const char **ret_value) |
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60 | { |
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61 | int n = 0, hit, i = 0; |
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62 | char r_name[32]; |
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63 | int r_unit; |
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64 | char r_resname[32]; |
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65 | char r_value[128]; |
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66 | const char *s, *cp; |
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67 | char *p; |
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68 | |
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69 | if (checkmethod) { |
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70 | hintp = NULL; |
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71 | |
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72 | switch (hintmode) { |
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73 | case 0: /* loader hints in environment only */ |
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74 | break; |
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75 | case 1: /* static hints only */ |
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76 | hintp = static_hints; |
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77 | checkmethod = 0; |
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78 | break; |
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79 | case 2: /* fallback mode */ |
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80 | if (dynamic_kenv) { |
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81 | mtx_lock(&kenv_lock); |
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82 | cp = kenvp[0]; |
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83 | for (i = 0; cp != NULL; cp = kenvp[++i]) { |
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84 | if (!strncmp(cp, "hint.", 5)) { |
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85 | use_kenv = 1; |
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86 | checkmethod = 0; |
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87 | break; |
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88 | } |
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89 | } |
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90 | mtx_unlock(&kenv_lock); |
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91 | } else { |
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92 | cp = kern_envp; |
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93 | while (cp) { |
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94 | if (strncmp(cp, "hint.", 5) == 0) { |
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95 | cp = NULL; |
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96 | hintp = kern_envp; |
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97 | break; |
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98 | } |
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99 | while (*cp != '\0') |
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100 | cp++; |
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101 | cp++; |
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102 | if (*cp == '\0') { |
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103 | cp = NULL; |
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104 | hintp = static_hints; |
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105 | break; |
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106 | } |
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107 | } |
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108 | } |
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109 | break; |
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110 | default: |
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111 | break; |
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112 | } |
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113 | if (hintp == NULL) { |
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114 | if (dynamic_kenv) { |
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115 | use_kenv = 1; |
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116 | checkmethod = 0; |
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117 | } else |
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118 | hintp = kern_envp; |
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119 | } |
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120 | } |
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121 | |
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122 | if (use_kenv) { |
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123 | mtx_lock(&kenv_lock); |
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124 | i = 0; |
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125 | cp = kenvp[0]; |
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126 | if (cp == NULL) { |
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127 | mtx_unlock(&kenv_lock); |
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128 | return (ENOENT); |
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129 | } |
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130 | } else |
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131 | cp = hintp; |
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132 | while (cp) { |
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133 | hit = 1; |
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134 | (*line)++; |
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135 | if (strncmp(cp, "hint.", 5) != 0) |
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136 | hit = 0; |
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137 | else |
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138 | n = sscanf(cp, "hint.%32[^.].%d.%32[^=]=%128s", |
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139 | r_name, &r_unit, r_resname, r_value); |
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140 | if (hit && n != 4) { |
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141 | printf("CONFIG: invalid hint '%s'\n", cp); |
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142 | /* XXX: abuse bogus index() declaration */ |
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143 | p = index(cp, 'h'); |
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144 | *p = 'H'; |
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145 | hit = 0; |
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146 | } |
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147 | if (hit && startln && *startln >= 0 && *line < *startln) |
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148 | hit = 0; |
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149 | if (hit && name && strcmp(name, r_name) != 0) |
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150 | hit = 0; |
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151 | if (hit && unit && *unit != r_unit) |
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152 | hit = 0; |
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153 | if (hit && resname && strcmp(resname, r_resname) != 0) |
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154 | hit = 0; |
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155 | if (hit && value && strcmp(value, r_value) != 0) |
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156 | hit = 0; |
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157 | if (hit) |
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158 | break; |
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159 | if (use_kenv) { |
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160 | cp = kenvp[++i]; |
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161 | if (cp == NULL) |
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162 | break; |
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163 | } else { |
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164 | while (*cp != '\0') |
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165 | cp++; |
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166 | cp++; |
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167 | if (*cp == '\0') { |
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168 | cp = NULL; |
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169 | break; |
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170 | } |
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171 | } |
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172 | } |
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173 | if (use_kenv) |
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174 | mtx_unlock(&kenv_lock); |
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175 | if (cp == NULL) |
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176 | return ENOENT; |
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177 | |
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178 | s = cp; |
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179 | /* This is a bit of a hack, but at least is reentrant */ |
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180 | /* Note that it returns some !unterminated! strings. */ |
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181 | s = index(s, '.') + 1; /* start of device */ |
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182 | if (ret_name) |
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183 | *ret_name = s; |
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184 | s = index(s, '.') + 1; /* start of unit */ |
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185 | if (ret_namelen && ret_name) |
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186 | *ret_namelen = s - *ret_name - 1; /* device length */ |
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187 | if (ret_unit) |
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188 | *ret_unit = r_unit; |
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189 | s = index(s, '.') + 1; /* start of resname */ |
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190 | if (ret_resname) |
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191 | *ret_resname = s; |
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192 | s = index(s, '=') + 1; /* start of value */ |
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193 | if (ret_resnamelen && ret_resname) |
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194 | *ret_resnamelen = s - *ret_resname - 1; /* value len */ |
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195 | if (ret_value) |
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196 | *ret_value = s; |
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197 | if (startln) /* line number for anchor */ |
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198 | *startln = *line + 1; |
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199 | return 0; |
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200 | } |
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201 | |
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202 | /* |
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203 | * Search all the data sources for matches to our query. We look for |
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204 | * dynamic hints first as overrides for static or fallback hints. |
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205 | */ |
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206 | static int |
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207 | resource_find(int *line, int *startln, |
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208 | const char *name, int *unit, const char *resname, const char *value, |
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209 | const char **ret_name, int *ret_namelen, int *ret_unit, |
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210 | const char **ret_resname, int *ret_resnamelen, const char **ret_value) |
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211 | { |
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212 | int i; |
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213 | int un; |
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214 | |
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215 | *line = 0; |
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216 | |
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217 | /* Search for exact unit matches first */ |
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218 | i = res_find(line, startln, name, unit, resname, value, |
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219 | ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen, |
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220 | ret_value); |
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221 | if (i == 0) |
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222 | return 0; |
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223 | if (unit == NULL) |
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224 | return ENOENT; |
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225 | /* If we are still here, search for wildcard matches */ |
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226 | un = -1; |
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227 | i = res_find(line, startln, name, &un, resname, value, |
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228 | ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen, |
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229 | ret_value); |
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230 | if (i == 0) |
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231 | return 0; |
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232 | return ENOENT; |
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233 | } |
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234 | |
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235 | int |
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236 | resource_int_value(const char *name, int unit, const char *resname, int *result) |
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237 | { |
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238 | int error; |
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239 | const char *str; |
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240 | char *op; |
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241 | unsigned long val; |
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242 | int line; |
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243 | |
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244 | line = 0; |
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245 | error = resource_find(&line, NULL, name, &unit, resname, NULL, |
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246 | NULL, NULL, NULL, NULL, NULL, &str); |
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247 | if (error) |
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248 | return error; |
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249 | if (*str == '\0') |
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250 | return EFTYPE; |
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251 | val = strtoul(str, &op, 0); |
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252 | if (*op != '\0') |
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253 | return EFTYPE; |
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254 | *result = val; |
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255 | return 0; |
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256 | } |
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257 | |
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258 | #ifndef __rtems__ |
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259 | int |
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260 | resource_long_value(const char *name, int unit, const char *resname, |
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261 | long *result) |
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262 | { |
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263 | int error; |
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264 | const char *str; |
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265 | char *op; |
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266 | unsigned long val; |
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267 | int line; |
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268 | |
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269 | line = 0; |
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270 | error = resource_find(&line, NULL, name, &unit, resname, NULL, |
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271 | NULL, NULL, NULL, NULL, NULL, &str); |
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272 | if (error) |
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273 | return error; |
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274 | if (*str == '\0') |
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275 | return EFTYPE; |
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276 | val = strtoul(str, &op, 0); |
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277 | if (*op != '\0') |
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278 | return EFTYPE; |
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279 | *result = val; |
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280 | return 0; |
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281 | } |
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282 | #endif /* __rtems__ */ |
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283 | |
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284 | int |
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285 | resource_string_value(const char *name, int unit, const char *resname, |
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286 | const char **result) |
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287 | { |
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288 | int error; |
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289 | const char *str; |
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290 | int line; |
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291 | |
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292 | line = 0; |
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293 | error = resource_find(&line, NULL, name, &unit, resname, NULL, |
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294 | NULL, NULL, NULL, NULL, NULL, &str); |
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295 | if (error) |
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296 | return error; |
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297 | *result = str; |
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298 | return 0; |
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299 | } |
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300 | |
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301 | /* |
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302 | * This is a bit nasty, but allows us to not modify the env strings. |
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303 | */ |
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304 | static const char * |
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305 | resource_string_copy(const char *s, int len) |
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306 | { |
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307 | static char stringbuf[256]; |
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308 | static int offset = 0; |
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309 | const char *ret; |
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310 | |
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311 | if (len == 0) |
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312 | len = strlen(s); |
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313 | if (len > 255) |
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314 | return NULL; |
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315 | if ((offset + len + 1) > 255) |
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316 | offset = 0; |
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317 | bcopy(s, &stringbuf[offset], len); |
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318 | stringbuf[offset + len] = '\0'; |
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319 | ret = &stringbuf[offset]; |
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320 | offset += len + 1; |
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321 | return ret; |
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322 | } |
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323 | |
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324 | /* |
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325 | * err = resource_find_match(&anchor, &name, &unit, resname, value) |
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326 | * Iteratively fetch a list of devices wired "at" something |
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327 | * res and value are restrictions. eg: "at", "scbus0". |
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328 | * For practical purposes, res = required, value = optional. |
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329 | * *name and *unit are set. |
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330 | * set *anchor to zero before starting. |
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331 | */ |
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332 | int |
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333 | resource_find_match(int *anchor, const char **name, int *unit, |
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334 | const char *resname, const char *value) |
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335 | { |
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336 | const char *found_name; |
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337 | int found_namelen; |
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338 | int found_unit; |
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339 | int ret; |
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340 | int newln; |
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341 | |
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342 | newln = *anchor; |
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343 | ret = resource_find(anchor, &newln, NULL, NULL, resname, value, |
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344 | &found_name, &found_namelen, &found_unit, NULL, NULL, NULL); |
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345 | if (ret == 0) { |
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346 | *name = resource_string_copy(found_name, found_namelen); |
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347 | *unit = found_unit; |
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348 | } |
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349 | *anchor = newln; |
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350 | return ret; |
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351 | } |
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352 | |
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353 | #ifndef __rtems__ |
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354 | |
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355 | /* |
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356 | * err = resource_find_dev(&anchor, name, &unit, res, value); |
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357 | * Iterate through a list of devices, returning their unit numbers. |
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358 | * res and value are optional restrictions. eg: "at", "scbus0". |
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359 | * *unit is set to the value. |
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360 | * set *anchor to zero before starting. |
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361 | */ |
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362 | int |
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363 | resource_find_dev(int *anchor, const char *name, int *unit, |
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364 | const char *resname, const char *value) |
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365 | { |
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366 | int found_unit; |
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367 | int newln; |
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368 | int ret; |
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369 | |
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370 | newln = *anchor; |
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371 | ret = resource_find(anchor, &newln, name, NULL, resname, value, |
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372 | NULL, NULL, &found_unit, NULL, NULL, NULL); |
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373 | if (ret == 0) { |
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374 | *unit = found_unit; |
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375 | } |
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376 | *anchor = newln; |
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377 | return ret; |
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378 | } |
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379 | |
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380 | /* |
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381 | * Check to see if a device is disabled via a disabled hint. |
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382 | */ |
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383 | int |
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384 | resource_disabled(const char *name, int unit) |
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385 | { |
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386 | int error, value; |
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387 | |
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388 | error = resource_int_value(name, unit, "disabled", &value); |
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389 | if (error) |
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390 | return (0); |
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391 | return (value); |
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392 | } |
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393 | #endif /* __rtems__ */ |
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