aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/parser/psscope.c
blob: 1c953b6f1af16958fb7a7163e5fa0ac847650972 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
/******************************************************************************
 *
 * Module Name: psscope - Parser scope stack management routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acparser.h>

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psscope")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_parent_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Pointer to an Op object
 *
 * DESCRIPTION: Get parent of current op being parsed
 *
 ******************************************************************************/
union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state
						  *parser_state)
{

	return (parser_state->scope->parse_scope.op);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_has_completed_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      Boolean, TRUE = scope completed.
 *
 * DESCRIPTION: Is parsing of current argument complete?  Determined by
 *              1) AML pointer is at or beyond the end of the scope
 *              2) The scope argument count has reached zero.
 *
 ******************************************************************************/

u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state)
{

	return ((u8)
		((parser_state->aml >= parser_state->scope->parse_scope.arg_end
		  || !parser_state->scope->parse_scope.arg_count)));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_init_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              Root                - the Root Node of this new scope
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocate and init a new scope object
 *
 ******************************************************************************/

acpi_status
acpi_ps_init_scope(struct acpi_parse_state * parser_state,
		   union acpi_parse_object * root_op)
{
	union acpi_generic_state *scope;

	ACPI_FUNCTION_TRACE_PTR("ps_init_scope", root_op);

	scope = acpi_ut_create_generic_state();
	if (!scope) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	scope->common.data_type = ACPI_DESC_TYPE_STATE_RPSCOPE;
	scope->parse_scope.op = root_op;
	scope->parse_scope.arg_count = ACPI_VAR_ARGS;
	scope->parse_scope.arg_end = parser_state->aml_end;
	scope->parse_scope.pkg_end = parser_state->aml_end;

	parser_state->scope = scope;
	parser_state->start_op = root_op;

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_push_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              Op                  - Current op to be pushed
 *              remaining_args      - List of args remaining
 *              arg_count           - Fixed or variable number of args
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Push current op to begin parsing its argument
 *
 ******************************************************************************/

acpi_status
acpi_ps_push_scope(struct acpi_parse_state *parser_state,
		   union acpi_parse_object *op,
		   u32 remaining_args, u32 arg_count)
{
	union acpi_generic_state *scope;

	ACPI_FUNCTION_TRACE_PTR("ps_push_scope", op);

	scope = acpi_ut_create_generic_state();
	if (!scope) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	scope->common.data_type = ACPI_DESC_TYPE_STATE_PSCOPE;
	scope->parse_scope.op = op;
	scope->parse_scope.arg_list = remaining_args;
	scope->parse_scope.arg_count = arg_count;
	scope->parse_scope.pkg_end = parser_state->pkg_end;

	/* Push onto scope stack */

	acpi_ut_push_generic_state(&parser_state->scope, scope);

	if (arg_count == ACPI_VAR_ARGS) {
		/* Multiple arguments */

		scope->parse_scope.arg_end = parser_state->pkg_end;
	} else {
		/* Single argument */

		scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_pop_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              Op                  - Where the popped op is returned
 *              arg_list            - Where the popped "next argument" is
 *                                    returned
 *              arg_count           - Count of objects in arg_list
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return to parsing a previous op
 *
 ******************************************************************************/

void
acpi_ps_pop_scope(struct acpi_parse_state *parser_state,
		  union acpi_parse_object **op, u32 * arg_list, u32 * arg_count)
{
	union acpi_generic_state *scope = parser_state->scope;

	ACPI_FUNCTION_TRACE("ps_pop_scope");

	/* Only pop the scope if there is in fact a next scope */

	if (scope->common.next) {
		scope = acpi_ut_pop_generic_state(&parser_state->scope);

		/* return to parsing previous op */

		*op = scope->parse_scope.op;
		*arg_list = scope->parse_scope.arg_list;
		*arg_count = scope->parse_scope.arg_count;
		parser_state->pkg_end = scope->parse_scope.pkg_end;

		/* All done with this scope state structure */

		acpi_ut_delete_generic_state(scope);
	} else {
		/* empty parse stack, prepare to fetch next opcode */

		*op = NULL;
		*arg_list = 0;
		*arg_count = 0;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "Popped Op %p Args %X\n", *op, *arg_count));
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_cleanup_scope
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      None
 *
 * DESCRIPTION: Destroy available list, remaining stack levels, and return
 *              root scope
 *
 ******************************************************************************/

void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state)
{
	union acpi_generic_state *scope;

	ACPI_FUNCTION_TRACE_PTR("ps_cleanup_scope", parser_state);

	if (!parser_state) {
		return_VOID;
	}

	/* Delete anything on the scope stack */

	while (parser_state->scope) {
		scope = acpi_ut_pop_generic_state(&parser_state->scope);
		acpi_ut_delete_generic_state(scope);
	}

	return_VOID;
}