1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acparser.h"
13#include "amlcode.h"
14#include "acconvert.h"
15
16#define _COMPONENT          ACPI_PARSER
17ACPI_MODULE_NAME("psutils")
18
19/*******************************************************************************
20 *
21 * FUNCTION:    acpi_ps_create_scope_op
22 *
23 * PARAMETERS:  None
24 *
25 * RETURN:      A new Scope object, null on failure
26 *
27 * DESCRIPTION: Create a Scope and associated namepath op with the root name
28 *
29 ******************************************************************************/
30union acpi_parse_object *acpi_ps_create_scope_op(u8 *aml)
31{
32	union acpi_parse_object *scope_op;
33
34	scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml);
35	if (!scope_op) {
36		return (NULL);
37	}
38
39	scope_op->named.name = ACPI_ROOT_NAME;
40	return (scope_op);
41}
42
43/*******************************************************************************
44 *
45 * FUNCTION:    acpi_ps_init_op
46 *
47 * PARAMETERS:  op              - A newly allocated Op object
48 *              opcode          - Opcode to store in the Op
49 *
50 * RETURN:      None
51 *
52 * DESCRIPTION: Initialize a parse (Op) object
53 *
54 ******************************************************************************/
55
56void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
57{
58	ACPI_FUNCTION_ENTRY();
59
60	op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
61	op->common.aml_opcode = opcode;
62
63	ACPI_DISASM_ONLY_MEMBERS(acpi_ut_safe_strncpy(op->common.aml_op_name,
64						      (acpi_ps_get_opcode_info
65						       (opcode))->name,
66						      sizeof(op->common.
67							     aml_op_name)));
68}
69
70/*******************************************************************************
71 *
72 * FUNCTION:    acpi_ps_alloc_op
73 *
74 * PARAMETERS:  opcode          - Opcode that will be stored in the new Op
75 *              aml             - Address of the opcode
76 *
77 * RETURN:      Pointer to the new Op, null on failure
78 *
79 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
80 *              opcode. A cache of opcodes is available for the pure
81 *              GENERIC_OP, since this is by far the most commonly used.
82 *
83 ******************************************************************************/
84
85union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml)
86{
87	union acpi_parse_object *op;
88	const struct acpi_opcode_info *op_info;
89	u8 flags = ACPI_PARSEOP_GENERIC;
90
91	ACPI_FUNCTION_ENTRY();
92
93	op_info = acpi_ps_get_opcode_info(opcode);
94
95	/* Determine type of parse_op required */
96
97	if (op_info->flags & AML_DEFER) {
98		flags = ACPI_PARSEOP_DEFERRED;
99	} else if (op_info->flags & AML_NAMED) {
100		flags = ACPI_PARSEOP_NAMED_OBJECT;
101	} else if (opcode == AML_INT_BYTELIST_OP) {
102		flags = ACPI_PARSEOP_BYTELIST;
103	}
104
105	/* Allocate the minimum required size object */
106
107	if (flags == ACPI_PARSEOP_GENERIC) {
108
109		/* The generic op (default) is by far the most common (16 to 1) */
110
111		op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
112	} else {
113		/* Extended parseop */
114
115		op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
116	}
117
118	/* Initialize the Op */
119
120	if (op) {
121		acpi_ps_init_op(op, opcode);
122		op->common.aml = aml;
123		op->common.flags = flags;
124		ASL_CV_CLEAR_OP_COMMENTS(op);
125
126		if (opcode == AML_SCOPE_OP) {
127			acpi_gbl_current_scope = op;
128		}
129
130		if (acpi_gbl_capture_comments) {
131			ASL_CV_TRANSFER_COMMENTS(op);
132		}
133	}
134
135	return (op);
136}
137
138/*******************************************************************************
139 *
140 * FUNCTION:    acpi_ps_free_op
141 *
142 * PARAMETERS:  op              - Op to be freed
143 *
144 * RETURN:      None.
145 *
146 * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
147 *              or actually free it.
148 *
149 ******************************************************************************/
150
151void acpi_ps_free_op(union acpi_parse_object *op)
152{
153	ACPI_FUNCTION_NAME(ps_free_op);
154
155	ASL_CV_CLEAR_OP_COMMENTS(op);
156	if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
157		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
158				  "Free retval op: %p\n", op));
159	}
160
161	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
162		(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
163	} else {
164		(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
165	}
166}
167
168/*******************************************************************************
169 *
170 * FUNCTION:    Utility functions
171 *
172 * DESCRIPTION: Low level character and object functions
173 *
174 ******************************************************************************/
175
176/*
177 * Is "c" a namestring lead character?
178 */
179u8 acpi_ps_is_leading_char(u32 c)
180{
181	return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
182}
183
184/*
185 * Get op's name (4-byte name segment) or 0 if unnamed
186 */
187u32 acpi_ps_get_name(union acpi_parse_object * op)
188{
189
190	/* The "generic" object has no name associated with it */
191
192	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
193		return (0);
194	}
195
196	/* Only the "Extended" parse objects have a name */
197
198	return (op->named.name);
199}
200
201/*
202 * Set op's name
203 */
204void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
205{
206
207	/* The "generic" object has no name associated with it */
208
209	if (op->common.flags & ACPI_PARSEOP_GENERIC) {
210		return;
211	}
212
213	op->named.name = name;
214}
215