ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / acpi / parser / psscope.c
blobee50e67c94431d28d9cd7052ce6ada8a92af020e
1 /******************************************************************************
3 * Module Name: psscope - Parser scope stack management routines
5 *****************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2008, Intel Corp.
9 * All rights reserved.
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.
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.
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.
44 #include <acpi/acpi.h>
45 #include <acpi/acparser.h>
47 #define _COMPONENT ACPI_PARSER
48 ACPI_MODULE_NAME("psscope")
50 /*******************************************************************************
52 * FUNCTION: acpi_ps_get_parent_scope
54 * PARAMETERS: parser_state - Current parser state object
56 * RETURN: Pointer to an Op object
58 * DESCRIPTION: Get parent of current op being parsed
60 ******************************************************************************/
61 union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state
62 *parser_state)
65 return (parser_state->scope->parse_scope.op);
68 /*******************************************************************************
70 * FUNCTION: acpi_ps_has_completed_scope
72 * PARAMETERS: parser_state - Current parser state object
74 * RETURN: Boolean, TRUE = scope completed.
76 * DESCRIPTION: Is parsing of current argument complete? Determined by
77 * 1) AML pointer is at or beyond the end of the scope
78 * 2) The scope argument count has reached zero.
80 ******************************************************************************/
82 u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state)
85 return ((u8)
86 ((parser_state->aml >= parser_state->scope->parse_scope.arg_end
87 || !parser_state->scope->parse_scope.arg_count)));
90 /*******************************************************************************
92 * FUNCTION: acpi_ps_init_scope
94 * PARAMETERS: parser_state - Current parser state object
95 * Root - the Root Node of this new scope
97 * RETURN: Status
99 * DESCRIPTION: Allocate and init a new scope object
101 ******************************************************************************/
103 acpi_status
104 acpi_ps_init_scope(struct acpi_parse_state * parser_state,
105 union acpi_parse_object * root_op)
107 union acpi_generic_state *scope;
109 ACPI_FUNCTION_TRACE_PTR(ps_init_scope, root_op);
111 scope = acpi_ut_create_generic_state();
112 if (!scope) {
113 return_ACPI_STATUS(AE_NO_MEMORY);
116 scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_RPSCOPE;
117 scope->parse_scope.op = root_op;
118 scope->parse_scope.arg_count = ACPI_VAR_ARGS;
119 scope->parse_scope.arg_end = parser_state->aml_end;
120 scope->parse_scope.pkg_end = parser_state->aml_end;
122 parser_state->scope = scope;
123 parser_state->start_op = root_op;
125 return_ACPI_STATUS(AE_OK);
128 /*******************************************************************************
130 * FUNCTION: acpi_ps_push_scope
132 * PARAMETERS: parser_state - Current parser state object
133 * Op - Current op to be pushed
134 * remaining_args - List of args remaining
135 * arg_count - Fixed or variable number of args
137 * RETURN: Status
139 * DESCRIPTION: Push current op to begin parsing its argument
141 ******************************************************************************/
143 acpi_status
144 acpi_ps_push_scope(struct acpi_parse_state *parser_state,
145 union acpi_parse_object *op,
146 u32 remaining_args, u32 arg_count)
148 union acpi_generic_state *scope;
150 ACPI_FUNCTION_TRACE_PTR(ps_push_scope, op);
152 scope = acpi_ut_create_generic_state();
153 if (!scope) {
154 return_ACPI_STATUS(AE_NO_MEMORY);
157 scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_PSCOPE;
158 scope->parse_scope.op = op;
159 scope->parse_scope.arg_list = remaining_args;
160 scope->parse_scope.arg_count = arg_count;
161 scope->parse_scope.pkg_end = parser_state->pkg_end;
163 /* Push onto scope stack */
165 acpi_ut_push_generic_state(&parser_state->scope, scope);
167 if (arg_count == ACPI_VAR_ARGS) {
169 /* Multiple arguments */
171 scope->parse_scope.arg_end = parser_state->pkg_end;
172 } else {
173 /* Single argument */
175 scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR);
178 return_ACPI_STATUS(AE_OK);
181 /*******************************************************************************
183 * FUNCTION: acpi_ps_pop_scope
185 * PARAMETERS: parser_state - Current parser state object
186 * Op - Where the popped op is returned
187 * arg_list - Where the popped "next argument" is
188 * returned
189 * arg_count - Count of objects in arg_list
191 * RETURN: Status
193 * DESCRIPTION: Return to parsing a previous op
195 ******************************************************************************/
197 void
198 acpi_ps_pop_scope(struct acpi_parse_state *parser_state,
199 union acpi_parse_object **op, u32 * arg_list, u32 * arg_count)
201 union acpi_generic_state *scope = parser_state->scope;
203 ACPI_FUNCTION_TRACE(ps_pop_scope);
205 /* Only pop the scope if there is in fact a next scope */
207 if (scope->common.next) {
208 scope = acpi_ut_pop_generic_state(&parser_state->scope);
210 /* Return to parsing previous op */
212 *op = scope->parse_scope.op;
213 *arg_list = scope->parse_scope.arg_list;
214 *arg_count = scope->parse_scope.arg_count;
215 parser_state->pkg_end = scope->parse_scope.pkg_end;
217 /* All done with this scope state structure */
219 acpi_ut_delete_generic_state(scope);
220 } else {
221 /* Empty parse stack, prepare to fetch next opcode */
223 *op = NULL;
224 *arg_list = 0;
225 *arg_count = 0;
228 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
229 "Popped Op %p Args %X\n", *op, *arg_count));
230 return_VOID;
233 /*******************************************************************************
235 * FUNCTION: acpi_ps_cleanup_scope
237 * PARAMETERS: parser_state - Current parser state object
239 * RETURN: None
241 * DESCRIPTION: Destroy available list, remaining stack levels, and return
242 * root scope
244 ******************************************************************************/
246 void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state)
248 union acpi_generic_state *scope;
250 ACPI_FUNCTION_TRACE_PTR(ps_cleanup_scope, parser_state);
252 if (!parser_state) {
253 return_VOID;
256 /* Delete anything on the scope stack */
258 while (parser_state->scope) {
259 scope = acpi_ut_pop_generic_state(&parser_state->scope);
260 acpi_ut_delete_generic_state(scope);
263 return_VOID;