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6595 | serge | 1 | /****************************************************************************** |
2 | * |
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3 | * Module Name: psutils - Parser miscellaneous utilities (Parser only) |
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4 | * |
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5 | *****************************************************************************/ |
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6 | |||
7 | /* |
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8 | * Copyright (C) 2000 - 2015, Intel Corp. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * 1. Redistributions of source code must retain the above copyright |
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15 | * notice, this list of conditions, and the following disclaimer, |
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16 | * without modification. |
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17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
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18 | * substantially similar to the "NO WARRANTY" disclaimer below |
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19 | * ("Disclaimer") and any redistribution must be conditioned upon |
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20 | * including a substantially similar Disclaimer requirement for further |
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21 | * binary redistribution. |
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22 | * 3. Neither the names of the above-listed copyright holders nor the names |
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23 | * of any contributors may be used to endorse or promote products derived |
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24 | * from this software without specific prior written permission. |
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25 | * |
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26 | * Alternatively, this software may be distributed under the terms of the |
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27 | * GNU General Public License ("GPL") version 2 as published by the Free |
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28 | * Software Foundation. |
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29 | * |
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30 | * NO WARRANTY |
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31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
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34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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41 | * POSSIBILITY OF SUCH DAMAGES. |
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42 | */ |
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43 | |||
44 | #include |
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45 | #include "accommon.h" |
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46 | #include "acparser.h" |
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47 | #include "amlcode.h" |
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48 | |||
49 | #define _COMPONENT ACPI_PARSER |
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50 | ACPI_MODULE_NAME("psutils") |
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51 | |||
52 | /******************************************************************************* |
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53 | * |
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54 | * FUNCTION: acpi_ps_create_scope_op |
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55 | * |
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56 | * PARAMETERS: None |
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57 | * |
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58 | * RETURN: A new Scope object, null on failure |
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59 | * |
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60 | * DESCRIPTION: Create a Scope and associated namepath op with the root name |
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61 | * |
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62 | ******************************************************************************/ |
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63 | union acpi_parse_object *acpi_ps_create_scope_op(u8 *aml) |
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64 | { |
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65 | union acpi_parse_object *scope_op; |
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66 | |||
67 | scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml); |
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68 | if (!scope_op) { |
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69 | return (NULL); |
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70 | } |
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71 | |||
72 | scope_op->named.name = ACPI_ROOT_NAME; |
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73 | return (scope_op); |
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74 | } |
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75 | |||
76 | /******************************************************************************* |
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77 | * |
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78 | * FUNCTION: acpi_ps_init_op |
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79 | * |
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80 | * PARAMETERS: op - A newly allocated Op object |
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81 | * opcode - Opcode to store in the Op |
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82 | * |
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83 | * RETURN: None |
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84 | * |
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85 | * DESCRIPTION: Initialize a parse (Op) object |
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86 | * |
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87 | ******************************************************************************/ |
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88 | |||
89 | void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode) |
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90 | { |
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91 | ACPI_FUNCTION_ENTRY(); |
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92 | |||
93 | op->common.descriptor_type = ACPI_DESC_TYPE_PARSER; |
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94 | op->common.aml_opcode = opcode; |
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95 | |||
96 | ACPI_DISASM_ONLY_MEMBERS(strncpy(op->common.aml_op_name, |
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97 | (acpi_ps_get_opcode_info(opcode))-> |
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98 | name, sizeof(op->common.aml_op_name))); |
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99 | } |
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100 | |||
101 | /******************************************************************************* |
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102 | * |
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103 | * FUNCTION: acpi_ps_alloc_op |
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104 | * |
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105 | * PARAMETERS: opcode - Opcode that will be stored in the new Op |
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106 | * aml - Address of the opcode |
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107 | * |
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108 | * RETURN: Pointer to the new Op, null on failure |
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109 | * |
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110 | * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on |
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111 | * opcode. A cache of opcodes is available for the pure |
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112 | * GENERIC_OP, since this is by far the most commonly used. |
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113 | * |
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114 | ******************************************************************************/ |
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115 | |||
116 | union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml) |
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117 | { |
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118 | union acpi_parse_object *op; |
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119 | const struct acpi_opcode_info *op_info; |
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120 | u8 flags = ACPI_PARSEOP_GENERIC; |
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121 | |||
122 | ACPI_FUNCTION_ENTRY(); |
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123 | |||
124 | op_info = acpi_ps_get_opcode_info(opcode); |
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125 | |||
126 | /* Determine type of parse_op required */ |
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127 | |||
128 | if (op_info->flags & AML_DEFER) { |
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129 | flags = ACPI_PARSEOP_DEFERRED; |
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130 | } else if (op_info->flags & AML_NAMED) { |
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131 | flags = ACPI_PARSEOP_NAMED; |
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132 | } else if (opcode == AML_INT_BYTELIST_OP) { |
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133 | flags = ACPI_PARSEOP_BYTELIST; |
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134 | } |
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135 | |||
136 | /* Allocate the minimum required size object */ |
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137 | |||
138 | if (flags == ACPI_PARSEOP_GENERIC) { |
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139 | |||
140 | /* The generic op (default) is by far the most common (16 to 1) */ |
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141 | |||
142 | op = acpi_os_acquire_object(acpi_gbl_ps_node_cache); |
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143 | } else { |
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144 | /* Extended parseop */ |
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145 | |||
146 | op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache); |
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147 | } |
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148 | |||
149 | /* Initialize the Op */ |
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150 | |||
151 | if (op) { |
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152 | acpi_ps_init_op(op, opcode); |
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153 | op->common.aml = aml; |
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154 | op->common.flags = flags; |
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155 | } |
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156 | |||
157 | return (op); |
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158 | } |
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159 | |||
160 | /******************************************************************************* |
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161 | * |
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162 | * FUNCTION: acpi_ps_free_op |
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163 | * |
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164 | * PARAMETERS: op - Op to be freed |
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165 | * |
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166 | * RETURN: None. |
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167 | * |
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168 | * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list |
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169 | * or actually free it. |
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170 | * |
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171 | ******************************************************************************/ |
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172 | |||
173 | void acpi_ps_free_op(union acpi_parse_object *op) |
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174 | { |
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175 | ACPI_FUNCTION_NAME(ps_free_op); |
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176 | |||
177 | if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { |
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178 | ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", |
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179 | op)); |
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180 | } |
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181 | |||
182 | if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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183 | (void)acpi_os_release_object(acpi_gbl_ps_node_cache, op); |
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184 | } else { |
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185 | (void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op); |
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186 | } |
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187 | } |
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188 | |||
189 | /******************************************************************************* |
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190 | * |
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191 | * FUNCTION: Utility functions |
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192 | * |
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193 | * DESCRIPTION: Low level character and object functions |
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194 | * |
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195 | ******************************************************************************/ |
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196 | |||
197 | /* |
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198 | * Is "c" a namestring lead character? |
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199 | */ |
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200 | u8 acpi_ps_is_leading_char(u32 c) |
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201 | { |
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202 | return ((u8) (c == '_' || (c >= 'A' && c <= 'Z'))); |
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203 | } |
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204 | |||
205 | /* |
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206 | * Get op's name (4-byte name segment) or 0 if unnamed |
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207 | */ |
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208 | u32 acpi_ps_get_name(union acpi_parse_object * op) |
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209 | { |
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210 | |||
211 | /* The "generic" object has no name associated with it */ |
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212 | |||
213 | if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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214 | return (0); |
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215 | } |
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216 | |||
217 | /* Only the "Extended" parse objects have a name */ |
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218 | |||
219 | return (op->named.name); |
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220 | } |
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221 | |||
222 | /* |
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223 | * Set op's name |
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224 | */ |
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225 | void acpi_ps_set_name(union acpi_parse_object *op, u32 name) |
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226 | { |
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227 | |||
228 | /* The "generic" object has no name associated with it */ |
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229 | |||
230 | if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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231 | return; |
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232 | } |
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233 | |||
234 | op->named.name = name; |
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235 | }=> |