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214 lines
5.3 KiB
214 lines
5.3 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: psutils - Parser miscellaneous utilities (Parser only) |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acparser.h" |
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#include "amlcode.h" |
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#include "acconvert.h" |
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#define _COMPONENT ACPI_PARSER |
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ACPI_MODULE_NAME("psutils") |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ps_create_scope_op |
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* |
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* PARAMETERS: None |
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* |
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* RETURN: A new Scope object, null on failure |
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* |
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* DESCRIPTION: Create a Scope and associated namepath op with the root name |
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* |
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******************************************************************************/ |
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union acpi_parse_object *acpi_ps_create_scope_op(u8 *aml) |
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{ |
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union acpi_parse_object *scope_op; |
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scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml); |
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if (!scope_op) { |
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return (NULL); |
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} |
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scope_op->named.name = ACPI_ROOT_NAME; |
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return (scope_op); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ps_init_op |
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* |
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* PARAMETERS: op - A newly allocated Op object |
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* opcode - Opcode to store in the Op |
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* |
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* RETURN: None |
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* |
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* DESCRIPTION: Initialize a parse (Op) object |
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* |
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******************************************************************************/ |
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void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode) |
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{ |
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ACPI_FUNCTION_ENTRY(); |
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op->common.descriptor_type = ACPI_DESC_TYPE_PARSER; |
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op->common.aml_opcode = opcode; |
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ACPI_DISASM_ONLY_MEMBERS(acpi_ut_safe_strncpy(op->common.aml_op_name, |
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(acpi_ps_get_opcode_info |
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(opcode))->name, |
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sizeof(op->common. |
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aml_op_name))); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ps_alloc_op |
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* |
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* PARAMETERS: opcode - Opcode that will be stored in the new Op |
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* aml - Address of the opcode |
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* |
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* RETURN: Pointer to the new Op, null on failure |
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* |
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* DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on |
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* opcode. A cache of opcodes is available for the pure |
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* GENERIC_OP, since this is by far the most commonly used. |
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* |
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******************************************************************************/ |
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union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml) |
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{ |
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union acpi_parse_object *op; |
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const struct acpi_opcode_info *op_info; |
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u8 flags = ACPI_PARSEOP_GENERIC; |
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ACPI_FUNCTION_ENTRY(); |
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op_info = acpi_ps_get_opcode_info(opcode); |
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/* Determine type of parse_op required */ |
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if (op_info->flags & AML_DEFER) { |
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flags = ACPI_PARSEOP_DEFERRED; |
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} else if (op_info->flags & AML_NAMED) { |
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flags = ACPI_PARSEOP_NAMED_OBJECT; |
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} else if (opcode == AML_INT_BYTELIST_OP) { |
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flags = ACPI_PARSEOP_BYTELIST; |
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} |
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/* Allocate the minimum required size object */ |
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if (flags == ACPI_PARSEOP_GENERIC) { |
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/* The generic op (default) is by far the most common (16 to 1) */ |
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op = acpi_os_acquire_object(acpi_gbl_ps_node_cache); |
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} else { |
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/* Extended parseop */ |
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op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache); |
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} |
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/* Initialize the Op */ |
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if (op) { |
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acpi_ps_init_op(op, opcode); |
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op->common.aml = aml; |
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op->common.flags = flags; |
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ASL_CV_CLEAR_OP_COMMENTS(op); |
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if (opcode == AML_SCOPE_OP) { |
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acpi_gbl_current_scope = op; |
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} |
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if (acpi_gbl_capture_comments) { |
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ASL_CV_TRANSFER_COMMENTS(op); |
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} |
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} |
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return (op); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ps_free_op |
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* |
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* PARAMETERS: op - Op to be freed |
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* |
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* RETURN: None. |
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* |
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* DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list |
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* or actually free it. |
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* |
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******************************************************************************/ |
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void acpi_ps_free_op(union acpi_parse_object *op) |
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{ |
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ACPI_FUNCTION_NAME(ps_free_op); |
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ASL_CV_CLEAR_OP_COMMENTS(op); |
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if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { |
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, |
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"Free retval op: %p\n", op)); |
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} |
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if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op); |
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} else { |
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(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op); |
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} |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: Utility functions |
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* |
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* DESCRIPTION: Low level character and object functions |
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* |
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******************************************************************************/ |
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/* |
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* Is "c" a namestring lead character? |
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*/ |
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u8 acpi_ps_is_leading_char(u32 c) |
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{ |
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return ((u8) (c == '_' || (c >= 'A' && c <= 'Z'))); |
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} |
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/* |
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* Get op's name (4-byte name segment) or 0 if unnamed |
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*/ |
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u32 acpi_ps_get_name(union acpi_parse_object * op) |
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{ |
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/* The "generic" object has no name associated with it */ |
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if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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return (0); |
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} |
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/* Only the "Extended" parse objects have a name */ |
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return (op->named.name); |
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} |
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/* |
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* Set op's name |
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*/ |
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void acpi_ps_set_name(union acpi_parse_object *op, u32 name) |
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{ |
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/* The "generic" object has no name associated with it */ |
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if (op->common.flags & ACPI_PARSEOP_GENERIC) { |
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return; |
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} |
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op->named.name = name; |
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}
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