1 /******************************************************************************
3 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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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.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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44 #include <acpi/acpi.h>
45 #include <acpi/acparser.h>
46 #include <acpi/amlcode.h>
48 #define _COMPONENT ACPI_PARSER
49 ACPI_MODULE_NAME("psutils")
51 /*******************************************************************************
53 * FUNCTION: acpi_ps_create_scope_op
57 * RETURN: A new Scope object, null on failure
59 * DESCRIPTION: Create a Scope and associated namepath op with the root name
61 ******************************************************************************/
62 union acpi_parse_object *acpi_ps_create_scope_op(void)
64 union acpi_parse_object *scope_op;
66 scope_op = acpi_ps_alloc_op(AML_SCOPE_OP);
71 scope_op->named.name = ACPI_ROOT_NAME;
75 /*******************************************************************************
77 * FUNCTION: acpi_ps_init_op
79 * PARAMETERS: Op - A newly allocated Op object
80 * Opcode - Opcode to store in the Op
84 * DESCRIPTION: Initialize a parse (Op) object
86 ******************************************************************************/
88 void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
90 ACPI_FUNCTION_ENTRY();
92 op->common.data_type = ACPI_DESC_TYPE_PARSER;
93 op->common.aml_opcode = opcode;
95 ACPI_DISASM_ONLY_MEMBERS(ACPI_STRNCPY(op->common.aml_op_name,
96 (acpi_ps_get_opcode_info
98 sizeof(op->common.aml_op_name)));
101 /*******************************************************************************
103 * FUNCTION: acpi_ps_alloc_op
105 * PARAMETERS: Opcode - Opcode that will be stored in the new Op
107 * RETURN: Pointer to the new Op, null on failure
109 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
110 * opcode. A cache of opcodes is available for the pure
111 * GENERIC_OP, since this is by far the most commonly used.
113 ******************************************************************************/
115 union acpi_parse_object *acpi_ps_alloc_op(u16 opcode)
117 union acpi_parse_object *op;
118 const struct acpi_opcode_info *op_info;
119 u8 flags = ACPI_PARSEOP_GENERIC;
121 ACPI_FUNCTION_ENTRY();
123 op_info = acpi_ps_get_opcode_info(opcode);
125 /* Determine type of parse_op required */
127 if (op_info->flags & AML_DEFER) {
128 flags = ACPI_PARSEOP_DEFERRED;
129 } else if (op_info->flags & AML_NAMED) {
130 flags = ACPI_PARSEOP_NAMED;
131 } else if (opcode == AML_INT_BYTELIST_OP) {
132 flags = ACPI_PARSEOP_BYTELIST;
135 /* Allocate the minimum required size object */
137 if (flags == ACPI_PARSEOP_GENERIC) {
138 /* The generic op (default) is by far the most common (16 to 1) */
140 op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
141 memset(op, 0, sizeof(struct acpi_parse_obj_common));
143 /* Extended parseop */
145 op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
146 memset(op, 0, sizeof(struct acpi_parse_obj_named));
149 /* Initialize the Op */
152 acpi_ps_init_op(op, opcode);
153 op->common.flags = flags;
159 /*******************************************************************************
161 * FUNCTION: acpi_ps_free_op
163 * PARAMETERS: Op - Op to be freed
167 * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
168 * or actually free it.
170 ******************************************************************************/
172 void acpi_ps_free_op(union acpi_parse_object *op)
174 ACPI_FUNCTION_NAME("ps_free_op");
176 if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
177 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n",
181 if (op->common.flags & ACPI_PARSEOP_GENERIC) {
182 (void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
184 (void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
188 /*******************************************************************************
190 * FUNCTION: Utility functions
192 * DESCRIPTION: Low level character and object functions
194 ******************************************************************************/
197 * Is "c" a namestring lead character?
199 u8 acpi_ps_is_leading_char(u32 c)
201 return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
205 * Is "c" a namestring prefix character?
207 u8 acpi_ps_is_prefix_char(u32 c)
209 return ((u8) (c == '\\' || c == '^'));
213 * Get op's name (4-byte name segment) or 0 if unnamed
215 #ifdef ACPI_FUTURE_USAGE
216 u32 acpi_ps_get_name(union acpi_parse_object * op)
219 /* The "generic" object has no name associated with it */
221 if (op->common.flags & ACPI_PARSEOP_GENERIC) {
225 /* Only the "Extended" parse objects have a name */
227 return (op->named.name);
229 #endif /* ACPI_FUTURE_USAGE */
234 void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
237 /* The "generic" object has no name associated with it */
239 if (op->common.flags & ACPI_PARSEOP_GENERIC) {
243 op->named.name = name;