aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/parser/psutils.c
blob: 182474ae8ce9ed4f00e649b9781ad19477646722 (plain)
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
/******************************************************************************
 *
 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, 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>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psutils")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_create_scope_op
 *
 * PARAMETERS:  None
 *
 * RETURN:      A new Scope object, null on failure
 *
 * DESCRIPTION: Create a Scope and associated namepath op with the root name
 *
 ******************************************************************************/
union acpi_parse_object *acpi_ps_create_scope_op(void)
{
	union acpi_parse_object *scope_op;

	scope_op = acpi_ps_alloc_op(AML_SCOPE_OP);
	if (!scope_op) {
		return (NULL);
	}

	scope_op->named.name = ACPI_ROOT_NAME;
	return (scope_op);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_init_op
 *
 * PARAMETERS:  Op              - A newly allocated Op object
 *              Opcode          - Opcode to store in the Op
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a parse (Op) object
 *
 ******************************************************************************/

void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
{
	ACPI_FUNCTION_ENTRY();

	op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
	op->common.aml_opcode = opcode;

	ACPI_DISASM_ONLY_MEMBERS(ACPI_STRNCPY(op->common.aml_op_name,
					      (acpi_ps_get_opcode_info
					       (opcode))->name,
					      sizeof(op->common.aml_op_name)));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_alloc_op
 *
 * PARAMETERS:  Opcode          - Opcode that will be stored in the new Op
 *
 * RETURN:      Pointer to the new Op, null on failure
 *
 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
 *              opcode.  A cache of opcodes is available for the pure
 *              GENERIC_OP, since this is by far the most commonly used.
 *
 ******************************************************************************/

union acpi_parse_object *acpi_ps_alloc_op(u16 opcode)
{
	union acpi_parse_object *op;
	const struct acpi_opcode_info *op_info;
	u8 flags = ACPI_PARSEOP_GENERIC;

	ACPI_FUNCTION_ENTRY();

	op_info = acpi_ps_get_opcode_info(opcode);

	/* Determine type of parse_op required */

	if (op_info->flags & AML_DEFER) {
		flags = ACPI_PARSEOP_DEFERRED;
	} else if (op_info->flags & AML_NAMED) {
		flags = ACPI_PARSEOP_NAMED;
	} else if (opcode == AML_INT_BYTELIST_OP) {
		flags = ACPI_PARSEOP_BYTELIST;
	}

	/* Allocate the minimum required size object */

	if (flags == ACPI_PARSEOP_GENERIC) {

		/* The generic op (default) is by far the most common (16 to 1) */

		op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
		memset(op, 0, sizeof(struct acpi_parse_obj_common));
	} else {
		/* Extended parseop */

		op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
		memset(op, 0, sizeof(struct acpi_parse_obj_named));
	}

	/* Initialize the Op */

	if (op) {
		acpi_ps_init_op(op, opcode);
		op->common.flags = flags;
	}

	return (op);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_free_op
 *
 * PARAMETERS:  Op              - Op to be freed
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free an Op object.  Either put it on the GENERIC_OP cache list
 *              or actually free it.
 *
 ******************************************************************************/

void acpi_ps_free_op(union acpi_parse_object *op)
{
	ACPI_FUNCTION_NAME(ps_free_op);

	if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n",
				  op));
	}

	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
		(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
	} else {
		(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    Utility functions
 *
 * DESCRIPTION: Low level character and object functions
 *
 ******************************************************************************/

/*
 * Is "c" a namestring lead character?
 */
u8 acpi_ps_is_leading_char(u32 c)
{
	return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
}

/*
 * Is "c" a namestring prefix character?
 */
u8 acpi_ps_is_prefix_char(u32 c)
{
	return ((u8) (c == '\\' || c == '^'));
}

/*
 * Get op's name (4-byte name segment) or 0 if unnamed
 */
#ifdef ACPI_FUTURE_USAGE
u32 acpi_ps_get_name(union acpi_parse_object * op)
{

	/* The "generic" object has no name associated with it */

	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
		return (0);
	}

	/* Only the "Extended" parse objects have a name */

	return (op->named.name);
}
#endif				/*  ACPI_FUTURE_USAGE  */

/*
 * Set op's name
 */
void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
{

	/* The "generic" object has no name associated with it */

	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
		return;
	}

	op->named.name = name;
}