1/******************************************************************************
2 *
3 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, Intel Corp.
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
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acparser.h"
47#include "amlcode.h"
48
49#define _COMPONENT          ACPI_PARSER
50ACPI_MODULE_NAME("psutils")
51
52/*******************************************************************************
53 *
54 * FUNCTION:    acpi_ps_create_scope_op
55 *
56 * PARAMETERS:  None
57 *
58 * RETURN:      A new Scope object, null on failure
59 *
60 * DESCRIPTION: Create a Scope and associated namepath op with the root name
61 *
62 ******************************************************************************/
63union acpi_parse_object *acpi_ps_create_scope_op(void)
64{
65	union acpi_parse_object *scope_op;
66
67	scope_op = acpi_ps_alloc_op(AML_SCOPE_OP);
68	if (!scope_op) {
69		return (NULL);
70	}
71
72	scope_op->named.name = ACPI_ROOT_NAME;
73	return (scope_op);
74}
75
76/*******************************************************************************
77 *
78 * FUNCTION:    acpi_ps_init_op
79 *
80 * PARAMETERS:  op              - A newly allocated Op object
81 *              opcode          - Opcode to store in the Op
82 *
83 * RETURN:      None
84 *
85 * DESCRIPTION: Initialize a parse (Op) object
86 *
87 ******************************************************************************/
88
89void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
90{
91	ACPI_FUNCTION_ENTRY();
92
93	op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
94	op->common.aml_opcode = opcode;
95
96	ACPI_DISASM_ONLY_MEMBERS(ACPI_STRNCPY(op->common.aml_op_name,
97					      (acpi_ps_get_opcode_info
98					       (opcode))->name,
99					      sizeof(op->common.aml_op_name)));
100}
101
102/*******************************************************************************
103 *
104 * FUNCTION:    acpi_ps_alloc_op
105 *
106 * PARAMETERS:  opcode          - Opcode that will be stored in the new Op
107 *
108 * RETURN:      Pointer to the new Op, null on failure
109 *
110 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
111 *              opcode. A cache of opcodes is available for the pure
112 *              GENERIC_OP, since this is by far the most commonly used.
113 *
114 ******************************************************************************/
115
116union acpi_parse_object *acpi_ps_alloc_op(u16 opcode)
117{
118	union acpi_parse_object *op;
119	const struct acpi_opcode_info *op_info;
120	u8 flags = ACPI_PARSEOP_GENERIC;
121
122	ACPI_FUNCTION_ENTRY();
123
124	op_info = acpi_ps_get_opcode_info(opcode);
125
126	/* Determine type of parse_op required */
127
128	if (op_info->flags & AML_DEFER) {
129		flags = ACPI_PARSEOP_DEFERRED;
130	} else if (op_info->flags & AML_NAMED) {
131		flags = ACPI_PARSEOP_NAMED;
132	} else if (opcode == AML_INT_BYTELIST_OP) {
133		flags = ACPI_PARSEOP_BYTELIST;
134	}
135
136	/* Allocate the minimum required size object */
137
138	if (flags == ACPI_PARSEOP_GENERIC) {
139
140		/* The generic op (default) is by far the most common (16 to 1) */
141
142		op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
143	} else {
144		/* Extended parseop */
145
146		op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
147	}
148
149	/* Initialize the Op */
150
151	if (op) {
152		acpi_ps_init_op(op, opcode);
153		op->common.flags = flags;
154	}
155
156	return (op);
157}
158
159/*******************************************************************************
160 *
161 * FUNCTION:    acpi_ps_free_op
162 *
163 * PARAMETERS:  op              - Op to be freed
164 *
165 * RETURN:      None.
166 *
167 * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
168 *              or actually free it.
169 *
170 ******************************************************************************/
171
172void acpi_ps_free_op(union acpi_parse_object *op)
173{
174	ACPI_FUNCTION_NAME(ps_free_op);
175
176	if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
177		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n",
178				  op));
179	}
180
181	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
182		(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
183	} else {
184		(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
185	}
186}
187
188/*******************************************************************************
189 *
190 * FUNCTION:    Utility functions
191 *
192 * DESCRIPTION: Low level character and object functions
193 *
194 ******************************************************************************/
195
196/*
197 * Is "c" a namestring lead character?
198 */
199u8 acpi_ps_is_leading_char(u32 c)
200{
201	return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
202}
203
204/*
205 * Get op's name (4-byte name segment) or 0 if unnamed
206 */
207#ifdef ACPI_FUTURE_USAGE
208u32 acpi_ps_get_name(union acpi_parse_object * op)
209{
210
211	/* The "generic" object has no name associated with it */
212
213	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
214		return (0);
215	}
216
217	/* Only the "Extended" parse objects have a name */
218
219	return (op->named.name);
220}
221#endif				/*  ACPI_FUTURE_USAGE  */
222
223/*
224 * Set op's name
225 */
226void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
227{
228
229	/* The "generic" object has no name associated with it */
230
231	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
232		return;
233	}
234
235	op->named.name = name;
236}
237