484 lines
14 KiB
C
484 lines
14 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/*******************************************************************************
|
|
*
|
|
* Module Name: nseval - Object evaluation, includes control method execution
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include "accommon.h"
|
|
#include "acparser.h"
|
|
#include "acinterp.h"
|
|
#include "acnamesp.h"
|
|
|
|
#define _COMPONENT ACPI_NAMESPACE
|
|
ACPI_MODULE_NAME("nseval")
|
|
|
|
/* Local prototypes */
|
|
static void
|
|
acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
|
|
struct acpi_evaluate_info *info);
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_evaluate
|
|
*
|
|
* PARAMETERS: info - Evaluation info block, contains these fields
|
|
* and more:
|
|
* prefix_node - Prefix or Method/Object Node to execute
|
|
* relative_path - Name of method to execute, If NULL, the
|
|
* Node is the object to execute
|
|
* parameters - List of parameters to pass to the method,
|
|
* terminated by NULL. Params itself may be
|
|
* NULL if no parameters are being passed.
|
|
* parameter_type - Type of Parameter list
|
|
* return_object - Where to put method's return value (if
|
|
* any). If NULL, no value is returned.
|
|
* flags - ACPI_IGNORE_RETURN_VALUE to delete return
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Execute a control method or return the current value of an
|
|
* ACPI namespace object.
|
|
*
|
|
* MUTEX: Locks interpreter
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info)
|
|
{
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(ns_evaluate);
|
|
|
|
if (!info) {
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
|
|
if (!info->node) {
|
|
/*
|
|
* Get the actual namespace node for the target object if we
|
|
* need to. Handles these cases:
|
|
*
|
|
* 1) Null node, valid pathname from root (absolute path)
|
|
* 2) Node and valid pathname (path relative to Node)
|
|
* 3) Node, Null pathname
|
|
*/
|
|
status =
|
|
acpi_ns_get_node(info->prefix_node, info->relative_pathname,
|
|
ACPI_NS_NO_UPSEARCH, &info->node);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For a method alias, we must grab the actual method node so that
|
|
* proper scoping context will be established before execution.
|
|
*/
|
|
if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
|
|
info->node =
|
|
ACPI_CAST_PTR(struct acpi_namespace_node,
|
|
info->node->object);
|
|
}
|
|
|
|
/* Complete the info block initialization */
|
|
|
|
info->return_object = NULL;
|
|
info->node_flags = info->node->flags;
|
|
info->obj_desc = acpi_ns_get_attached_object(info->node);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
|
|
info->relative_pathname, info->node,
|
|
acpi_ns_get_attached_object(info->node)));
|
|
|
|
/* Get info if we have a predefined name (_HID, etc.) */
|
|
|
|
info->predefined =
|
|
acpi_ut_match_predefined_method(info->node->name.ascii);
|
|
|
|
/* Get the full pathname to the object, for use in warning messages */
|
|
|
|
info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
|
|
if (!info->full_pathname) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Count the number of arguments being passed in */
|
|
|
|
info->param_count = 0;
|
|
if (info->parameters) {
|
|
while (info->parameters[info->param_count]) {
|
|
info->param_count++;
|
|
}
|
|
|
|
/* Warn on impossible argument count */
|
|
|
|
if (info->param_count > ACPI_METHOD_NUM_ARGS) {
|
|
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
|
|
ACPI_WARN_ALWAYS,
|
|
"Excess arguments (%u) - using only %u",
|
|
info->param_count,
|
|
ACPI_METHOD_NUM_ARGS));
|
|
|
|
info->param_count = ACPI_METHOD_NUM_ARGS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For predefined names: Check that the declared argument count
|
|
* matches the ACPI spec -- otherwise this is a BIOS error.
|
|
*/
|
|
acpi_ns_check_acpi_compliance(info->full_pathname, info->node,
|
|
info->predefined);
|
|
|
|
/*
|
|
* For all names: Check that the incoming argument count for
|
|
* this method/object matches the actual ASL/AML definition.
|
|
*/
|
|
acpi_ns_check_argument_count(info->full_pathname, info->node,
|
|
info->param_count, info->predefined);
|
|
|
|
/* For predefined names: Typecheck all incoming arguments */
|
|
|
|
acpi_ns_check_argument_types(info);
|
|
|
|
/*
|
|
* Three major evaluation cases:
|
|
*
|
|
* 1) Object types that cannot be evaluated by definition
|
|
* 2) The object is a control method -- execute it
|
|
* 3) The object is not a method -- just return it's current value
|
|
*/
|
|
switch (acpi_ns_get_type(info->node)) {
|
|
case ACPI_TYPE_ANY:
|
|
case ACPI_TYPE_DEVICE:
|
|
case ACPI_TYPE_EVENT:
|
|
case ACPI_TYPE_MUTEX:
|
|
case ACPI_TYPE_REGION:
|
|
case ACPI_TYPE_THERMAL:
|
|
case ACPI_TYPE_LOCAL_SCOPE:
|
|
/*
|
|
* 1) Disallow evaluation of these object types. For these,
|
|
* object evaluation is undefined.
|
|
*/
|
|
ACPI_ERROR((AE_INFO,
|
|
"%s: This object type [%s] "
|
|
"never contains data and cannot be evaluated",
|
|
info->full_pathname,
|
|
acpi_ut_get_type_name(info->node->type)));
|
|
|
|
status = AE_TYPE;
|
|
goto cleanup;
|
|
|
|
case ACPI_TYPE_METHOD:
|
|
/*
|
|
* 2) Object is a control method - execute it
|
|
*/
|
|
|
|
/* Verify that there is a method object associated with this node */
|
|
|
|
if (!info->obj_desc) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"%s: Method has no attached sub-object",
|
|
info->full_pathname));
|
|
status = AE_NULL_OBJECT;
|
|
goto cleanup;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"**** Execute method [%s] at AML address %p length %X\n",
|
|
info->full_pathname,
|
|
info->obj_desc->method.aml_start + 1,
|
|
info->obj_desc->method.aml_length - 1));
|
|
|
|
/*
|
|
* Any namespace deletion must acquire both the namespace and
|
|
* interpreter locks to ensure that no thread is using the portion of
|
|
* the namespace that is being deleted.
|
|
*
|
|
* Execute the method via the interpreter. The interpreter is locked
|
|
* here before calling into the AML parser
|
|
*/
|
|
acpi_ex_enter_interpreter();
|
|
status = acpi_ps_execute_method(info);
|
|
acpi_ex_exit_interpreter();
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* 3) All other non-method objects -- get the current object value
|
|
*/
|
|
|
|
/*
|
|
* Some objects require additional resolution steps (e.g., the Node
|
|
* may be a field that must be read, etc.) -- we can't just grab
|
|
* the object out of the node.
|
|
*
|
|
* Use resolve_node_to_value() to get the associated value.
|
|
*
|
|
* NOTE: we can get away with passing in NULL for a walk state because
|
|
* the Node is guaranteed to not be a reference to either a method
|
|
* local or a method argument (because this interface is never called
|
|
* from a running method.)
|
|
*
|
|
* Even though we do not directly invoke the interpreter for object
|
|
* resolution, we must lock it because we could access an op_region.
|
|
* The op_region access code assumes that the interpreter is locked.
|
|
*/
|
|
acpi_ex_enter_interpreter();
|
|
|
|
/* TBD: resolve_node_to_value has a strange interface, fix */
|
|
|
|
info->return_object =
|
|
ACPI_CAST_PTR(union acpi_operand_object, info->node);
|
|
|
|
status =
|
|
acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
|
|
(struct acpi_namespace_node,
|
|
&info->return_object), NULL);
|
|
acpi_ex_exit_interpreter();
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
info->return_object = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n",
|
|
info->return_object,
|
|
acpi_ut_get_object_type_name(info->
|
|
return_object)));
|
|
|
|
status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* For predefined names, check the return value against the ACPI
|
|
* specification. Some incorrect return value types are repaired.
|
|
*/
|
|
(void)acpi_ns_check_return_value(info->node, info, info->param_count,
|
|
status, &info->return_object);
|
|
|
|
/* Check if there is a return value that must be dealt with */
|
|
|
|
if (status == AE_CTRL_RETURN_VALUE) {
|
|
|
|
/* If caller does not want the return value, delete it */
|
|
|
|
if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
|
|
acpi_ut_remove_reference(info->return_object);
|
|
info->return_object = NULL;
|
|
}
|
|
|
|
/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
|
|
|
|
status = AE_OK;
|
|
} else if (ACPI_FAILURE(status)) {
|
|
|
|
/* If return_object exists, delete it */
|
|
|
|
if (info->return_object) {
|
|
acpi_ut_remove_reference(info->return_object);
|
|
info->return_object = NULL;
|
|
}
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"*** Completed evaluation of object %s ***\n",
|
|
info->relative_pathname));
|
|
|
|
cleanup:
|
|
/*
|
|
* Namespace was unlocked by the handling acpi_ns* function, so we
|
|
* just free the pathname and return
|
|
*/
|
|
ACPI_FREE(info->full_pathname);
|
|
info->full_pathname = NULL;
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_exec_module_code_list
|
|
*
|
|
* PARAMETERS: None
|
|
*
|
|
* RETURN: None. Exceptions during method execution are ignored, since
|
|
* we cannot abort a table load.
|
|
*
|
|
* DESCRIPTION: Execute all elements of the global module-level code list.
|
|
* Each element is executed as a single control method.
|
|
*
|
|
* NOTE: With this option enabled, each block of detected executable AML
|
|
* code that is outside of any control method is wrapped with a temporary
|
|
* control method object and placed on a global list. The methods on this
|
|
* list are executed below.
|
|
*
|
|
* This function executes the module-level code for all tables only after
|
|
* all of the tables have been loaded. It is a legacy option and is
|
|
* not compatible with other ACPI implementations. See acpi_ns_load_table.
|
|
*
|
|
* This function will be removed when the legacy option is removed.
|
|
*
|
|
******************************************************************************/
|
|
|
|
void acpi_ns_exec_module_code_list(void)
|
|
{
|
|
union acpi_operand_object *prev;
|
|
union acpi_operand_object *next;
|
|
struct acpi_evaluate_info *info;
|
|
u32 method_count = 0;
|
|
|
|
ACPI_FUNCTION_TRACE(ns_exec_module_code_list);
|
|
|
|
/* Exit now if the list is empty */
|
|
|
|
next = acpi_gbl_module_code_list;
|
|
if (!next) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INIT_NAMES,
|
|
"Legacy MLC block list is empty\n"));
|
|
|
|
return_VOID;
|
|
}
|
|
|
|
/* Allocate the evaluation information block */
|
|
|
|
info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info));
|
|
if (!info) {
|
|
return_VOID;
|
|
}
|
|
|
|
/* Walk the list, executing each "method" */
|
|
|
|
while (next) {
|
|
prev = next;
|
|
next = next->method.mutex;
|
|
|
|
/* Clear the link field and execute the method */
|
|
|
|
prev->method.mutex = NULL;
|
|
acpi_ns_exec_module_code(prev, info);
|
|
method_count++;
|
|
|
|
/* Delete the (temporary) method object */
|
|
|
|
acpi_ut_remove_reference(prev);
|
|
}
|
|
|
|
ACPI_INFO(("Executed %u blocks of module-level executable AML code",
|
|
method_count));
|
|
|
|
ACPI_FREE(info);
|
|
acpi_gbl_module_code_list = NULL;
|
|
return_VOID;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_exec_module_code
|
|
*
|
|
* PARAMETERS: method_obj - Object container for the module-level code
|
|
* info - Info block for method evaluation
|
|
*
|
|
* RETURN: None. Exceptions during method execution are ignored, since
|
|
* we cannot abort a table load.
|
|
*
|
|
* DESCRIPTION: Execute a control method containing a block of module-level
|
|
* executable AML code. The control method is temporarily
|
|
* installed to the root node, then evaluated.
|
|
*
|
|
******************************************************************************/
|
|
|
|
static void
|
|
acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
|
|
struct acpi_evaluate_info *info)
|
|
{
|
|
union acpi_operand_object *parent_obj;
|
|
struct acpi_namespace_node *parent_node;
|
|
acpi_object_type type;
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(ns_exec_module_code);
|
|
|
|
/*
|
|
* Get the parent node. We cheat by using the next_object field
|
|
* of the method object descriptor.
|
|
*/
|
|
parent_node =
|
|
ACPI_CAST_PTR(struct acpi_namespace_node,
|
|
method_obj->method.next_object);
|
|
type = acpi_ns_get_type(parent_node);
|
|
|
|
/*
|
|
* Get the region handler and save it in the method object. We may need
|
|
* this if an operation region declaration causes a _REG method to be run.
|
|
*
|
|
* We can't do this in acpi_ps_link_module_code because
|
|
* acpi_gbl_root_node->Object is NULL at PASS1.
|
|
*/
|
|
if ((type == ACPI_TYPE_DEVICE) && parent_node->object) {
|
|
method_obj->method.dispatch.handler =
|
|
parent_node->object->device.handler;
|
|
}
|
|
|
|
/* Must clear next_object (acpi_ns_attach_object needs the field) */
|
|
|
|
method_obj->method.next_object = NULL;
|
|
|
|
/* Initialize the evaluation information block */
|
|
|
|
memset(info, 0, sizeof(struct acpi_evaluate_info));
|
|
info->prefix_node = parent_node;
|
|
|
|
/*
|
|
* Get the currently attached parent object. Add a reference,
|
|
* because the ref count will be decreased when the method object
|
|
* is installed to the parent node.
|
|
*/
|
|
parent_obj = acpi_ns_get_attached_object(parent_node);
|
|
if (parent_obj) {
|
|
acpi_ut_add_reference(parent_obj);
|
|
}
|
|
|
|
/* Install the method (module-level code) in the parent node */
|
|
|
|
status =
|
|
acpi_ns_attach_object(parent_node, method_obj, ACPI_TYPE_METHOD);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto exit;
|
|
}
|
|
|
|
/* Execute the parent node as a control method */
|
|
|
|
status = acpi_ns_evaluate(info);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INIT_NAMES,
|
|
"Executed module-level code at %p\n",
|
|
method_obj->method.aml_start));
|
|
|
|
/* Delete a possible implicit return value (in slack mode) */
|
|
|
|
if (info->return_object) {
|
|
acpi_ut_remove_reference(info->return_object);
|
|
}
|
|
|
|
/* Detach the temporary method object */
|
|
|
|
acpi_ns_detach_object(parent_node);
|
|
|
|
/* Restore the original parent object */
|
|
|
|
if (parent_obj) {
|
|
status = acpi_ns_attach_object(parent_node, parent_obj, type);
|
|
} else {
|
|
parent_node->type = (u8)type;
|
|
}
|
|
|
|
exit:
|
|
if (parent_obj) {
|
|
acpi_ut_remove_reference(parent_obj);
|
|
}
|
|
return_VOID;
|
|
}
|