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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psscope - Parser scope stack management routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
b4e104ea | 8 | * Copyright (C) 2000 - 2011, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acparser.h" | |
1da177e4 LT |
47 | |
48 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 49 | ACPI_MODULE_NAME("psscope") |
1da177e4 LT |
50 | |
51 | /******************************************************************************* | |
52 | * | |
53 | * FUNCTION: acpi_ps_get_parent_scope | |
54 | * | |
55 | * PARAMETERS: parser_state - Current parser state object | |
56 | * | |
57 | * RETURN: Pointer to an Op object | |
58 | * | |
59 | * DESCRIPTION: Get parent of current op being parsed | |
60 | * | |
61 | ******************************************************************************/ | |
4be44fcd LB |
62 | union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state |
63 | *parser_state) | |
1da177e4 | 64 | { |
44f6c012 | 65 | |
1da177e4 LT |
66 | return (parser_state->scope->parse_scope.op); |
67 | } | |
68 | ||
1da177e4 LT |
69 | /******************************************************************************* |
70 | * | |
71 | * FUNCTION: acpi_ps_has_completed_scope | |
72 | * | |
73 | * PARAMETERS: parser_state - Current parser state object | |
74 | * | |
75 | * RETURN: Boolean, TRUE = scope completed. | |
76 | * | |
77 | * DESCRIPTION: Is parsing of current argument complete? Determined by | |
78 | * 1) AML pointer is at or beyond the end of the scope | |
79 | * 2) The scope argument count has reached zero. | |
80 | * | |
81 | ******************************************************************************/ | |
82 | ||
4be44fcd | 83 | u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state) |
1da177e4 | 84 | { |
44f6c012 RM |
85 | |
86 | return ((u8) | |
4be44fcd LB |
87 | ((parser_state->aml >= parser_state->scope->parse_scope.arg_end |
88 | || !parser_state->scope->parse_scope.arg_count))); | |
1da177e4 LT |
89 | } |
90 | ||
1da177e4 LT |
91 | /******************************************************************************* |
92 | * | |
93 | * FUNCTION: acpi_ps_init_scope | |
94 | * | |
95 | * PARAMETERS: parser_state - Current parser state object | |
96 | * Root - the Root Node of this new scope | |
97 | * | |
98 | * RETURN: Status | |
99 | * | |
100 | * DESCRIPTION: Allocate and init a new scope object | |
101 | * | |
102 | ******************************************************************************/ | |
103 | ||
104 | acpi_status | |
4be44fcd LB |
105 | acpi_ps_init_scope(struct acpi_parse_state * parser_state, |
106 | union acpi_parse_object * root_op) | |
1da177e4 | 107 | { |
4be44fcd | 108 | union acpi_generic_state *scope; |
1da177e4 | 109 | |
b229cf92 | 110 | ACPI_FUNCTION_TRACE_PTR(ps_init_scope, root_op); |
1da177e4 | 111 | |
4be44fcd | 112 | scope = acpi_ut_create_generic_state(); |
1da177e4 | 113 | if (!scope) { |
4be44fcd | 114 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
115 | } |
116 | ||
61686124 | 117 | scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_RPSCOPE; |
4be44fcd | 118 | scope->parse_scope.op = root_op; |
1da177e4 | 119 | scope->parse_scope.arg_count = ACPI_VAR_ARGS; |
4be44fcd LB |
120 | scope->parse_scope.arg_end = parser_state->aml_end; |
121 | scope->parse_scope.pkg_end = parser_state->aml_end; | |
1da177e4 | 122 | |
4be44fcd LB |
123 | parser_state->scope = scope; |
124 | parser_state->start_op = root_op; | |
1da177e4 | 125 | |
4be44fcd | 126 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
127 | } |
128 | ||
1da177e4 LT |
129 | /******************************************************************************* |
130 | * | |
131 | * FUNCTION: acpi_ps_push_scope | |
132 | * | |
133 | * PARAMETERS: parser_state - Current parser state object | |
134 | * Op - Current op to be pushed | |
135 | * remaining_args - List of args remaining | |
136 | * arg_count - Fixed or variable number of args | |
137 | * | |
138 | * RETURN: Status | |
139 | * | |
140 | * DESCRIPTION: Push current op to begin parsing its argument | |
141 | * | |
142 | ******************************************************************************/ | |
143 | ||
144 | acpi_status | |
4be44fcd LB |
145 | acpi_ps_push_scope(struct acpi_parse_state *parser_state, |
146 | union acpi_parse_object *op, | |
793c2388 | 147 | u32 remaining_args, u32 arg_count) |
1da177e4 | 148 | { |
4be44fcd | 149 | union acpi_generic_state *scope; |
1da177e4 | 150 | |
b229cf92 | 151 | ACPI_FUNCTION_TRACE_PTR(ps_push_scope, op); |
1da177e4 | 152 | |
4be44fcd | 153 | scope = acpi_ut_create_generic_state(); |
1da177e4 | 154 | if (!scope) { |
4be44fcd | 155 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
156 | } |
157 | ||
61686124 | 158 | scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_PSCOPE; |
4be44fcd | 159 | scope->parse_scope.op = op; |
44f6c012 RM |
160 | scope->parse_scope.arg_list = remaining_args; |
161 | scope->parse_scope.arg_count = arg_count; | |
162 | scope->parse_scope.pkg_end = parser_state->pkg_end; | |
1da177e4 LT |
163 | |
164 | /* Push onto scope stack */ | |
165 | ||
4be44fcd | 166 | acpi_ut_push_generic_state(&parser_state->scope, scope); |
1da177e4 LT |
167 | |
168 | if (arg_count == ACPI_VAR_ARGS) { | |
52fc0b02 | 169 | |
44f6c012 | 170 | /* Multiple arguments */ |
1da177e4 LT |
171 | |
172 | scope->parse_scope.arg_end = parser_state->pkg_end; | |
4be44fcd | 173 | } else { |
44f6c012 | 174 | /* Single argument */ |
1da177e4 | 175 | |
4be44fcd | 176 | scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR); |
1da177e4 LT |
177 | } |
178 | ||
4be44fcd | 179 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
180 | } |
181 | ||
1da177e4 LT |
182 | /******************************************************************************* |
183 | * | |
184 | * FUNCTION: acpi_ps_pop_scope | |
185 | * | |
186 | * PARAMETERS: parser_state - Current parser state object | |
187 | * Op - Where the popped op is returned | |
188 | * arg_list - Where the popped "next argument" is | |
189 | * returned | |
190 | * arg_count - Count of objects in arg_list | |
191 | * | |
192 | * RETURN: Status | |
193 | * | |
194 | * DESCRIPTION: Return to parsing a previous op | |
195 | * | |
196 | ******************************************************************************/ | |
197 | ||
198 | void | |
4be44fcd | 199 | acpi_ps_pop_scope(struct acpi_parse_state *parser_state, |
793c2388 | 200 | union acpi_parse_object **op, u32 * arg_list, u32 * arg_count) |
1da177e4 | 201 | { |
4be44fcd | 202 | union acpi_generic_state *scope = parser_state->scope; |
1da177e4 | 203 | |
b229cf92 | 204 | ACPI_FUNCTION_TRACE(ps_pop_scope); |
1da177e4 | 205 | |
44f6c012 RM |
206 | /* Only pop the scope if there is in fact a next scope */ |
207 | ||
1da177e4 | 208 | if (scope->common.next) { |
4be44fcd | 209 | scope = acpi_ut_pop_generic_state(&parser_state->scope); |
1da177e4 | 210 | |
61686124 | 211 | /* Return to parsing previous op */ |
1da177e4 | 212 | |
4be44fcd LB |
213 | *op = scope->parse_scope.op; |
214 | *arg_list = scope->parse_scope.arg_list; | |
215 | *arg_count = scope->parse_scope.arg_count; | |
44f6c012 | 216 | parser_state->pkg_end = scope->parse_scope.pkg_end; |
1da177e4 LT |
217 | |
218 | /* All done with this scope state structure */ | |
219 | ||
4be44fcd LB |
220 | acpi_ut_delete_generic_state(scope); |
221 | } else { | |
61686124 | 222 | /* Empty parse stack, prepare to fetch next opcode */ |
1da177e4 | 223 | |
4be44fcd | 224 | *op = NULL; |
44f6c012 RM |
225 | *arg_list = 0; |
226 | *arg_count = 0; | |
1da177e4 LT |
227 | } |
228 | ||
4be44fcd LB |
229 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
230 | "Popped Op %p Args %X\n", *op, *arg_count)); | |
1da177e4 LT |
231 | return_VOID; |
232 | } | |
233 | ||
1da177e4 LT |
234 | /******************************************************************************* |
235 | * | |
236 | * FUNCTION: acpi_ps_cleanup_scope | |
237 | * | |
238 | * PARAMETERS: parser_state - Current parser state object | |
239 | * | |
44f6c012 | 240 | * RETURN: None |
1da177e4 LT |
241 | * |
242 | * DESCRIPTION: Destroy available list, remaining stack levels, and return | |
243 | * root scope | |
244 | * | |
245 | ******************************************************************************/ | |
246 | ||
4be44fcd | 247 | void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state) |
1da177e4 | 248 | { |
4be44fcd | 249 | union acpi_generic_state *scope; |
1da177e4 | 250 | |
b229cf92 | 251 | ACPI_FUNCTION_TRACE_PTR(ps_cleanup_scope, parser_state); |
1da177e4 LT |
252 | |
253 | if (!parser_state) { | |
254 | return_VOID; | |
255 | } | |
256 | ||
257 | /* Delete anything on the scope stack */ | |
258 | ||
259 | while (parser_state->scope) { | |
4be44fcd LB |
260 | scope = acpi_ut_pop_generic_state(&parser_state->scope); |
261 | acpi_ut_delete_generic_state(scope); | |
1da177e4 LT |
262 | } |
263 | ||
264 | return_VOID; | |
265 | } |