1 /******************************************************************************
3 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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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
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44 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_PARSER
50 ACPI_MODULE_NAME("psutils")
52 /*******************************************************************************
54 * FUNCTION: acpi_ps_create_scope_op
58 * RETURN: A new Scope object, null on failure
60 * DESCRIPTION: Create a Scope and associated namepath op with the root name
62 ******************************************************************************/
63 union acpi_parse_object *acpi_ps_create_scope_op(void)
65 union acpi_parse_object *scope_op;
67 scope_op = acpi_ps_alloc_op(AML_SCOPE_OP);
72 scope_op->named.name = ACPI_ROOT_NAME;
76 /*******************************************************************************
78 * FUNCTION: acpi_ps_init_op
80 * PARAMETERS: Op - A newly allocated Op object
81 * Opcode - Opcode to store in the Op
85 * DESCRIPTION: Initialize a parse (Op) object
87 ******************************************************************************/
89 void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
91 ACPI_FUNCTION_ENTRY();
93 op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
94 op->common.aml_opcode = opcode;
96 ACPI_DISASM_ONLY_MEMBERS(ACPI_STRNCPY(op->common.aml_op_name,
97 (acpi_ps_get_opcode_info
99 sizeof(op->common.aml_op_name)));
102 /*******************************************************************************
104 * FUNCTION: acpi_ps_alloc_op
106 * PARAMETERS: Opcode - Opcode that will be stored in the new Op
108 * RETURN: Pointer to the new Op, null on failure
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.
114 ******************************************************************************/
116 union acpi_parse_object *acpi_ps_alloc_op(u16 opcode)
118 union acpi_parse_object *op;
119 const struct acpi_opcode_info *op_info;
120 u8 flags = ACPI_PARSEOP_GENERIC;
122 ACPI_FUNCTION_ENTRY();
124 op_info = acpi_ps_get_opcode_info(opcode);
126 /* Determine type of parse_op required */
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;
136 /* Allocate the minimum required size object */
138 if (flags == ACPI_PARSEOP_GENERIC) {
140 /* The generic op (default) is by far the most common (16 to 1) */
142 op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
144 /* Extended parseop */
146 op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
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;