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- // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
- /******************************************************************************
- *
- * Module Name: psutils - Parser miscellaneous utilities (Parser only)
- *
- * Copyright (C) 2000 - 2022, Intel Corp.
- *
- *****************************************************************************/
- #include <acpi/acpi.h>
- #include "accommon.h"
- #include "acparser.h"
- #include "amlcode.h"
- #include "acconvert.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(u8 *aml)
- {
- union acpi_parse_object *scope_op;
- scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml);
- 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_ut_safe_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
- * aml - Address of the opcode
- *
- * 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, u8 *aml)
- {
- 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_OBJECT;
- } 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);
- } else {
- /* Extended parseop */
- op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
- }
- /* Initialize the Op */
- if (op) {
- acpi_ps_init_op(op, opcode);
- op->common.aml = aml;
- op->common.flags = flags;
- ASL_CV_CLEAR_OP_COMMENTS(op);
- if (opcode == AML_SCOPE_OP) {
- acpi_gbl_current_scope = op;
- }
- if (acpi_gbl_capture_comments) {
- ASL_CV_TRANSFER_COMMENTS(op);
- }
- }
- 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);
- ASL_CV_CLEAR_OP_COMMENTS(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')));
- }
- /*
- * Get op's name (4-byte name segment) or 0 if unnamed
- */
- 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);
- }
- /*
- * 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;
- }
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