532 lines
16 KiB
C
532 lines
16 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: dspkginit - Completion of deferred package initialization
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*
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* Copyright (C) 2000 - 2019, 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 "acnamesp.h"
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#include "amlcode.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#include "acparser.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("dspkginit")
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/* Local prototypes */
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static void
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acpi_ds_resolve_package_element(union acpi_operand_object **element);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_build_internal_package_obj
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*
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* PARAMETERS: walk_state - Current walk state
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* op - Parser object to be translated
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* element_count - Number of elements in the package - this is
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* the num_elements argument to Package()
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* obj_desc_ptr - Where the ACPI internal object is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Translate a parser Op package object to the equivalent
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* namespace object
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*
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* NOTE: The number of elements in the package will be always be the num_elements
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* count, regardless of the number of elements in the package list. If
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* num_elements is smaller, only that many package list elements are used.
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* if num_elements is larger, the Package object is padded out with
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* objects of type Uninitialized (as per ACPI spec.)
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*
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* Even though the ASL compilers do not allow num_elements to be smaller
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* than the Package list length (for the fixed length package opcode), some
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* BIOS code modifies the AML on the fly to adjust the num_elements, and
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* this code compensates for that. This also provides compatibility with
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* other AML interpreters.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
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union acpi_parse_object *op,
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u32 element_count,
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union acpi_operand_object **obj_desc_ptr)
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{
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union acpi_parse_object *arg;
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union acpi_parse_object *parent;
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union acpi_operand_object *obj_desc = NULL;
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acpi_status status = AE_OK;
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u8 module_level_code = FALSE;
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u16 reference_count;
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u32 index;
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u32 i;
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ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
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/* Check if we are executing module level code */
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if (walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL) {
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module_level_code = TRUE;
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}
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/* Find the parent of a possibly nested package */
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parent = op->common.parent;
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while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
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(parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
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parent = parent->common.parent;
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}
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/*
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* If we are evaluating a Named package object of the form:
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* Name (xxxx, Package)
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* the package object already exists, otherwise it must be created.
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*/
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obj_desc = *obj_desc_ptr;
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if (!obj_desc) {
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obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
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*obj_desc_ptr = obj_desc;
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if (!obj_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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obj_desc->package.node = parent->common.node;
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}
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if (obj_desc->package.flags & AOPOBJ_DATA_VALID) { /* Just in case */
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Allocate the element array (array of pointers to the individual
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* objects) if necessary. the count is based on the num_elements
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* parameter. Add an extra pointer slot so that the list is always
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* null terminated.
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*/
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if (!obj_desc->package.elements) {
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obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
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element_count
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+
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1) *
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sizeof(void
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*));
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if (!obj_desc->package.elements) {
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acpi_ut_delete_object_desc(obj_desc);
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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obj_desc->package.count = element_count;
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}
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/* First arg is element count. Second arg begins the initializer list */
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arg = op->common.value.arg;
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arg = arg->common.next;
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/*
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* If we are executing module-level code, we will defer the
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* full resolution of the package elements in order to support
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* forward references from the elements. This provides
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* compatibility with other ACPI implementations.
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*/
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if (module_level_code) {
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obj_desc->package.aml_start = walk_state->aml;
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obj_desc->package.aml_length = 0;
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
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"%s: Deferring resolution of Package elements\n",
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ACPI_GET_FUNCTION_NAME));
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}
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/*
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* Initialize the elements of the package, up to the num_elements count.
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* Package is automatically padded with uninitialized (NULL) elements
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* if num_elements is greater than the package list length. Likewise,
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* Package is truncated if num_elements is less than the list length.
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*/
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for (i = 0; arg && (i < element_count); i++) {
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if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
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if (!arg->common.node) {
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/*
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* This is the case where an expression has returned a value.
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* The use of expressions (term_args) within individual
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* package elements is not supported by the AML interpreter,
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* even though the ASL grammar supports it. Example:
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*
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* Name (INT1, 0x1234)
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*
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* Name (PKG3, Package () {
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* Add (INT1, 0xAAAA0000)
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* })
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*
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* 1) No known AML interpreter supports this type of construct
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* 2) This fixes a fault if the construct is encountered
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*/
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ACPI_EXCEPTION((AE_INFO, AE_SUPPORT,
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"Expressions within package elements are not supported"));
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/* Cleanup the return object, it is not needed */
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acpi_ut_remove_reference(walk_state->results->
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results.obj_desc[0]);
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return_ACPI_STATUS(AE_SUPPORT);
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}
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if (arg->common.node->type == ACPI_TYPE_METHOD) {
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/*
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* A method reference "looks" to the parser to be a method
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* invocation, so we special case it here
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*/
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arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
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status =
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acpi_ds_build_internal_object(walk_state,
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arg,
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&obj_desc->
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package.
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elements[i]);
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} else {
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/* This package element is already built, just get it */
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obj_desc->package.elements[i] =
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ACPI_CAST_PTR(union acpi_operand_object,
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arg->common.node);
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}
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} else {
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status =
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acpi_ds_build_internal_object(walk_state, arg,
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&obj_desc->package.
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elements[i]);
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if (status == AE_NOT_FOUND) {
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ACPI_ERROR((AE_INFO, "%-48s",
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"****DS namepath not found"));
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}
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if (!module_level_code) {
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/*
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* Initialize this package element. This function handles the
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* resolution of named references within the package.
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* Forward references from module-level code are deferred
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* until all ACPI tables are loaded.
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*/
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acpi_ds_init_package_element(0,
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obj_desc->package.
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elements[i], NULL,
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&obj_desc->package.
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elements[i]);
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}
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}
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if (*obj_desc_ptr) {
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/* Existing package, get existing reference count */
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reference_count =
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(*obj_desc_ptr)->common.reference_count;
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if (reference_count > 1) {
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/* Make new element ref count match original ref count */
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/* TBD: Probably need an acpi_ut_add_references function */
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for (index = 0;
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index < ((u32)reference_count - 1);
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index++) {
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acpi_ut_add_reference((obj_desc->
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package.
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elements[i]));
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}
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}
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}
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arg = arg->common.next;
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}
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/* Check for match between num_elements and actual length of package_list */
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if (arg) {
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/*
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* num_elements was exhausted, but there are remaining elements in
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* the package_list. Truncate the package to num_elements.
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*
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* Note: technically, this is an error, from ACPI spec: "It is an
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* error for NumElements to be less than the number of elements in
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* the PackageList". However, we just print a message and no
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* exception is returned. This provides compatibility with other
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* ACPI implementations. Some firmware implementations will alter
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* the num_elements on the fly, possibly creating this type of
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* ill-formed package object.
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*/
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while (arg) {
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/*
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* We must delete any package elements that were created earlier
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* and are not going to be used because of the package truncation.
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*/
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if (arg->common.node) {
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acpi_ut_remove_reference(ACPI_CAST_PTR
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(union
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acpi_operand_object,
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arg->common.node));
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arg->common.node = NULL;
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}
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/* Find out how many elements there really are */
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i++;
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arg = arg->common.next;
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}
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ACPI_INFO(("Actual Package length (%u) is larger than "
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"NumElements field (%u), truncated",
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i, element_count));
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} else if (i < element_count) {
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/*
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* Arg list (elements) was exhausted, but we did not reach
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* num_elements count.
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*
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* Note: this is not an error, the package is padded out
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* with NULLs as per the ACPI specification.
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*/
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
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"%s: Package List length (%u) smaller than NumElements "
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"count (%u), padded with null elements\n",
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ACPI_GET_FUNCTION_NAME, i,
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element_count));
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}
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/* Module-level packages will be resolved later */
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if (!module_level_code) {
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obj_desc->package.flags |= AOPOBJ_DATA_VALID;
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}
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op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_init_package_element
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*
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* PARAMETERS: acpi_pkg_callback
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*
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* RETURN: Status
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*
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* DESCRIPTION: Resolve a named reference element within a package object
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*
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******************************************************************************/
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acpi_status
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acpi_ds_init_package_element(u8 object_type,
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union acpi_operand_object *source_object,
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union acpi_generic_state *state, void *context)
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{
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union acpi_operand_object **element_ptr;
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ACPI_FUNCTION_TRACE(ds_init_package_element);
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if (!source_object) {
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* The following code is a bit of a hack to workaround a (current)
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* limitation of the acpi_pkg_callback interface. We need a pointer
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* to the location within the element array because a new object
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* may be created and stored there.
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*/
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if (context) {
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/* A direct call was made to this function */
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element_ptr = (union acpi_operand_object **)context;
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} else {
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/* Call came from acpi_ut_walk_package_tree */
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element_ptr = state->pkg.this_target_obj;
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}
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/* We are only interested in reference objects/elements */
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if (source_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
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/* Attempt to resolve the (named) reference to a namespace node */
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acpi_ds_resolve_package_element(element_ptr);
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} else if (source_object->common.type == ACPI_TYPE_PACKAGE) {
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source_object->package.flags |= AOPOBJ_DATA_VALID;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_resolve_package_element
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*
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* PARAMETERS: element_ptr - Pointer to a reference object
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*
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* RETURN: Possible new element is stored to the indirect element_ptr
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*
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* DESCRIPTION: Resolve a package element that is a reference to a named
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* object.
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*
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******************************************************************************/
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static void
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acpi_ds_resolve_package_element(union acpi_operand_object **element_ptr)
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{
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acpi_status status;
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acpi_status status2;
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union acpi_generic_state scope_info;
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union acpi_operand_object *element = *element_ptr;
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struct acpi_namespace_node *resolved_node;
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struct acpi_namespace_node *original_node;
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char *external_path = "";
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acpi_object_type type;
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ACPI_FUNCTION_TRACE(ds_resolve_package_element);
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/* Check if reference element is already resolved */
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if (element->reference.resolved) {
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
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"%s: Package element is already resolved\n",
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ACPI_GET_FUNCTION_NAME));
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return_VOID;
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}
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/* Element must be a reference object of correct type */
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scope_info.scope.node = element->reference.node; /* Prefix node */
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status = acpi_ns_lookup(&scope_info, (char *)element->reference.aml,
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ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
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ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
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NULL, &resolved_node);
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if (ACPI_FAILURE(status)) {
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if ((status == AE_NOT_FOUND)
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&& acpi_gbl_ignore_package_resolution_errors) {
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/*
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* Optionally be silent about the NOT_FOUND case for the referenced
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* name. Although this is potentially a serious problem,
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* it can generate a lot of noise/errors on platforms whose
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* firmware carries around a bunch of unused Package objects.
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* To disable these errors, set this global to TRUE:
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* acpi_gbl_ignore_package_resolution_errors
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*
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* If the AML actually tries to use such a package, the unresolved
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* element(s) will be replaced with NULL elements.
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*/
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/* Referenced name not found, set the element to NULL */
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acpi_ut_remove_reference(*element_ptr);
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*element_ptr = NULL;
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return_VOID;
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}
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status2 = acpi_ns_externalize_name(ACPI_UINT32_MAX,
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(char *)element->reference.
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aml, NULL, &external_path);
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ACPI_EXCEPTION((AE_INFO, status,
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"While resolving a named reference package element - %s",
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external_path));
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if (ACPI_SUCCESS(status2)) {
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ACPI_FREE(external_path);
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}
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/* Could not resolve name, set the element to NULL */
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acpi_ut_remove_reference(*element_ptr);
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*element_ptr = NULL;
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return_VOID;
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} else if (resolved_node->type == ACPI_TYPE_ANY) {
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/* Named reference not resolved, return a NULL package element */
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ACPI_ERROR((AE_INFO,
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"Could not resolve named package element [%4.4s] in [%4.4s]",
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resolved_node->name.ascii,
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scope_info.scope.node->name.ascii));
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*element_ptr = NULL;
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return_VOID;
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}
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/*
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* Special handling for Alias objects. We need resolved_node to point
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* to the Alias target. This effectively "resolves" the alias.
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*/
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if (resolved_node->type == ACPI_TYPE_LOCAL_ALIAS) {
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resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node,
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resolved_node->object);
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}
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/* Update the reference object */
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element->reference.resolved = TRUE;
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element->reference.node = resolved_node;
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type = element->reference.node->type;
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/*
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* Attempt to resolve the node to a value before we insert it into
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* the package. If this is a reference to a common data type,
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* resolve it immediately. According to the ACPI spec, package
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* elements can only be "data objects" or method references.
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* Attempt to resolve to an Integer, Buffer, String or Package.
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* If cannot, return the named reference (for things like Devices,
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* Methods, etc.) Buffer Fields and Fields will resolve to simple
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* objects (int/buf/str/pkg).
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*
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* NOTE: References to things like Devices, Methods, Mutexes, etc.
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* will remain as named references. This behavior is not described
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* in the ACPI spec, but it appears to be an oversight.
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*/
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original_node = resolved_node;
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status = acpi_ex_resolve_node_to_value(&resolved_node, NULL);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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switch (type) {
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/*
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* These object types are a result of named references, so we will
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* leave them as reference objects. In other words, these types
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* have no intrinsic "value".
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*/
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_THERMAL:
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case ACPI_TYPE_METHOD:
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break;
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case ACPI_TYPE_MUTEX:
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case ACPI_TYPE_POWER:
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_EVENT:
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case ACPI_TYPE_REGION:
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/* acpi_ex_resolve_node_to_value gave these an extra reference */
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acpi_ut_remove_reference(original_node->object);
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break;
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default:
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/*
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* For all other types - the node was resolved to an actual
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* operand object with a value, return the object. Remove
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* a reference on the existing object.
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*/
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acpi_ut_remove_reference(element);
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*element_ptr = (union acpi_operand_object *)resolved_node;
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break;
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}
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return_VOID;
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}
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