cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/exstore.c

/******************************************************************************
 *
 * Module Name: exstore - AML Interpreter object store support
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exstore")

/* Local prototypes */
static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
			      union acpi_operand_object *dest_desc,
			      struct acpi_walk_state *walk_state);

static acpi_status
acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
			     struct acpi_namespace_node *node,
			     struct acpi_walk_state *walk_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store
 *
 * PARAMETERS:  *source_desc        - Value to be stored
 *              *dest_desc          - Where to store it. Must be an NS node
 *                                    or union acpi_operand_object of type
 *                                    Reference;
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the value described by source_desc into the location
 *              described by dest_desc. Called by various interpreter
 *              functions to store the result of an operation into
 *              the destination operand -- not just simply the actual "Store"
 *              ASL operator.
 *
 ******************************************************************************/


acpi_status acpi_ex_store(union acpi_operand_object *source_desc, union acpi_operand_object *dest_desc, struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_operand_object *ref_desc = dest_desc; ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc); /* Validate parameters */ if (!source_desc || !dest_desc) { ACPI_ERROR((AE_INFO, "Null parameter")); return_ACPI_STATUS(AE_AML_NO_OPERAND); } /* dest_desc can be either a namespace node or an ACPI object */ if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) { /* * Dest is a namespace node, * Storing an object into a Named node. */ status = acpi_ex_store_object_to_node(source_desc, (struct acpi_namespace_node *) dest_desc, walk_state, ACPI_IMPLICIT_CONVERSION); return_ACPI_STATUS(status); } /* Destination object must be a Reference or a Constant object */ switch (dest_desc->common.type) { case ACPI_TYPE_LOCAL_REFERENCE: break; case ACPI_TYPE_INTEGER: /* Allow stores to Constants -- a Noop as per ACPI spec */ if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) { return_ACPI_STATUS(AE_OK); } /*lint -fallthrough */ default: /* Destination is not a Reference object */ ACPI_ERROR((AE_INFO, "Target is not a Reference or Constant object - [%s] %p", acpi_ut_get_object_type_name(dest_desc), dest_desc)); return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } /* * Examine the Reference class. These cases are handled: * * 1) Store to Name (Change the object associated with a name) * 2) Store to an indexed area of a Buffer or Package * 3) Store to a Method Local or Arg * 4) Store to the debug object */ switch (ref_desc->reference.class) { case ACPI_REFCLASS_REFOF: /* Storing an object into a Name "container" */ status = acpi_ex_store_object_to_node(source_desc, ref_desc->reference. object, walk_state, ACPI_IMPLICIT_CONVERSION); break; case ACPI_REFCLASS_INDEX: /* Storing to an Index (pointer into a packager or buffer) */ status = acpi_ex_store_object_to_index(source_desc, ref_desc, walk_state); break; case ACPI_REFCLASS_LOCAL: case ACPI_REFCLASS_ARG: /* Store to a method local/arg */ status = acpi_ds_store_object_to_local(ref_desc->reference.class, ref_desc->reference.value, source_desc, walk_state); break; case ACPI_REFCLASS_DEBUG: /* * Storing to the Debug object causes the value stored to be * displayed and otherwise has no effect -- see ACPI Specification */ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Write to Debug Object: Object %p [%s] ****:\n\n", source_desc, acpi_ut_get_object_type_name(source_desc))); ACPI_DEBUG_OBJECT(source_desc, 0, 0); break; default: ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X", ref_desc->reference.class)); ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO); status = AE_AML_INTERNAL; break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds13043.19%414.81%
Linus Torvalds (pre-git)7926.25%27.41%
Andy Grover3912.96%933.33%
Robert Moore3210.63%829.63%
Len Brown206.64%311.11%
Lin Ming10.33%13.70%
Total301100.00%27100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_store_object_to_index * * PARAMETERS: *source_desc - Value to be stored * *dest_desc - Named object to receive the value * walk_state - Current walk state * * RETURN: Status * * DESCRIPTION: Store the object to indexed Buffer or Package element * ******************************************************************************/
static acpi_status acpi_ex_store_object_to_index(union acpi_operand_object *source_desc, union acpi_operand_object *index_desc, struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_operand_object *obj_desc; union acpi_operand_object *new_desc; u8 value = 0; u32 i; ACPI_FUNCTION_TRACE(ex_store_object_to_index); /* * Destination must be a reference pointer, and * must point to either a buffer or a package */ switch (index_desc->reference.target_type) { case ACPI_TYPE_PACKAGE: /* * Storing to a package element. Copy the object and replace * any existing object with the new object. No implicit * conversion is performed. * * The object at *(index_desc->Reference.Where) is the * element within the package that is to be modified. * The parent package object is at index_desc->Reference.Object */ obj_desc = *(index_desc->reference.where); if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE && source_desc->reference.class == ACPI_REFCLASS_TABLE) { /* This is a DDBHandle, just add a reference to it */ acpi_ut_add_reference(source_desc); new_desc = source_desc; } else { /* Normal object, copy it */ status = acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } } if (obj_desc) { /* Decrement reference count by the ref count of the parent package */ for (i = 0; i < ((union acpi_operand_object *) index_desc->reference.object)->common. reference_count; i++) { acpi_ut_remove_reference(obj_desc); } } *(index_desc->reference.where) = new_desc; /* Increment ref count by the ref count of the parent package-1 */ for (i = 1; i < ((union acpi_operand_object *) index_desc->reference.object)->common. reference_count; i++) { acpi_ut_add_reference(new_desc); } break; case ACPI_TYPE_BUFFER_FIELD: /* * Store into a Buffer or String (not actually a real buffer_field) * at a location defined by an Index. * * The first 8-bit element of the source object is written to the * 8-bit Buffer location defined by the Index destination object, * according to the ACPI 2.0 specification. */ /* * Make sure the target is a Buffer or String. An error should * not happen here, since the reference_object was constructed * by the INDEX_OP code. */ obj_desc = index_desc->reference.object; if ((obj_desc->common.type != ACPI_TYPE_BUFFER) && (obj_desc->common.type != ACPI_TYPE_STRING)) { return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } /* * The assignment of the individual elements will be slightly * different for each source type. */ switch (source_desc->common.type) { case ACPI_TYPE_INTEGER: /* Use the least-significant byte of the integer */ value = (u8) (source_desc->integer.value); break; case ACPI_TYPE_BUFFER: case ACPI_TYPE_STRING: /* Note: Takes advantage of common string/buffer fields */ value = source_desc->buffer.pointer[0]; break; default: /* All other types are invalid */ ACPI_ERROR((AE_INFO, "Source must be type [Integer/Buffer/String], found [%s]", acpi_ut_get_object_type_name(source_desc))); return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } /* Store the source value into the target buffer byte */ obj_desc->buffer.pointer[index_desc->reference.value] = value; break; default: ACPI_ERROR((AE_INFO, "Target is not of type [Package/BufferField]")); status = AE_AML_TARGET_TYPE; break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds9726.01%526.32%
Linus Torvalds (pre-git)8422.52%210.53%
Len Brown8422.52%210.53%
Andy Grover4913.14%315.79%
Robert Moore318.31%631.58%
Lin Ming287.51%15.26%
Total373100.00%19100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_store_object_to_node * * PARAMETERS: source_desc - Value to be stored * node - Named object to receive the value * walk_state - Current walk state * implicit_conversion - Perform implicit conversion (yes/no) * * RETURN: Status * * DESCRIPTION: Store the object to the named object. * * The assignment of an object to a named object is handled here. * The value passed in will replace the current value (if any) * with the input value. * * When storing into an object the data is converted to the * target object type then stored in the object. This means * that the target object type (for an initialized target) will * not be changed by a store operation. A copy_object can change * the target type, however. * * The implicit_conversion flag is set to NO/FALSE only when * storing to an arg_x -- as per the rules of the ACPI spec. * * Assumes parameters are already validated. * ******************************************************************************/
acpi_status acpi_ex_store_object_to_node(union acpi_operand_object *source_desc, struct acpi_namespace_node *node, struct acpi_walk_state *walk_state, u8 implicit_conversion) { acpi_status status = AE_OK; union acpi_operand_object *target_desc; union acpi_operand_object *new_desc; acpi_object_type target_type; ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc); /* Get current type of the node, and object attached to Node */ target_type = acpi_ns_get_type(node); target_desc = acpi_ns_get_attached_object(node); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p [%s] to node %p [%s]\n", source_desc, acpi_ut_get_object_type_name(source_desc), node, acpi_ut_get_type_name(target_type))); /* Only limited target types possible for everything except copy_object */ if (walk_state->opcode != AML_COPY_OP) { /* * Only copy_object allows all object types to be overwritten. For * target_ref(s), there are restrictions on the object types that * are allowed. * * Allowable operations/typing for Store: * * 1) Simple Store * Integer --> Integer (Named/Local/Arg) * String --> String (Named/Local/Arg) * Buffer --> Buffer (Named/Local/Arg) * Package --> Package (Named/Local/Arg) * * 2) Store with implicit conversion * Integer --> String or Buffer (Named) * String --> Integer or Buffer (Named) * Buffer --> Integer or String (Named) */ switch (target_type) { case ACPI_TYPE_PACKAGE: /* * Here, can only store a package to an existing package. * Storing a package to a Local/Arg is OK, and handled * elsewhere. */ if (walk_state->opcode == AML_STORE_OP) { if (source_desc->common.type != ACPI_TYPE_PACKAGE) { ACPI_ERROR((AE_INFO, "Cannot assign type [%s] to [Package] " "(source must be type Pkg)", acpi_ut_get_object_type_name (source_desc))); return_ACPI_STATUS(AE_AML_TARGET_TYPE); } break; } /* Fallthrough */ case ACPI_TYPE_DEVICE: case ACPI_TYPE_EVENT: case ACPI_TYPE_MUTEX: case ACPI_TYPE_REGION: case ACPI_TYPE_POWER: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_THERMAL: ACPI_ERROR((AE_INFO, "Target must be [Buffer/Integer/String/Reference]" ", found [%s] (%4.4s)", acpi_ut_get_type_name(node->type), node->name.ascii)); return_ACPI_STATUS(AE_AML_TARGET_TYPE); default: break; } } /* * Resolve the source object to an actual value * (If it is a reference object) */ status = acpi_ex_resolve_object(&source_desc, target_type, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Do the actual store operation */ switch (target_type) { /* * The simple data types all support implicit source operand * conversion before the store. */ case ACPI_TYPE_INTEGER: case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: if ((walk_state->opcode == AML_COPY_OP) || !implicit_conversion) { /* * However, copy_object and Stores to arg_x do not perform * an implicit conversion, as per the ACPI specification. * A direct store is performed instead. */ status = acpi_ex_store_direct_to_node(source_desc, node, walk_state); break; } /* Store with implicit source operand conversion support */ status = acpi_ex_store_object_to_object(source_desc, target_desc, &new_desc, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (new_desc != target_desc) { /* * Store the new new_desc as the new value of the Name, and set * the Name's type to that of the value being stored in it. * source_desc reference count is incremented by attach_object. * * Note: This may change the type of the node if an explicit * store has been performed such that the node/object type * has been changed. */ status = acpi_ns_attach_object(node, new_desc, new_desc->common.type); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Store type [%s] into [%s] via Convert/Attach\n", acpi_ut_get_object_type_name (source_desc), acpi_ut_get_object_type_name (new_desc))); } break; case ACPI_TYPE_BUFFER_FIELD: case ACPI_TYPE_LOCAL_REGION_FIELD: case ACPI_TYPE_LOCAL_BANK_FIELD: case ACPI_TYPE_LOCAL_INDEX_FIELD: /* * For all fields, always write the source data to the target * field. Any required implicit source operand conversion is * performed in the function below as necessary. Note, field * objects must retain their original type permanently. */ status = acpi_ex_write_data_to_field(source_desc, target_desc, &walk_state->result_obj); break; default: /* * copy_object operator: No conversions for all other types. * Instead, directly store a copy of the source object. * * This is the ACPI spec-defined behavior for the copy_object * operator. (Note, for this default case, all normal * Store/Target operations exited above with an error). */ status = acpi_ex_store_direct_to_node(source_desc, node, walk_state); break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore19449.11%529.41%
Linus Torvalds13333.67%317.65%
Andy Grover4110.38%635.29%
Linus Torvalds (pre-git)246.08%211.76%
Len Brown30.76%15.88%
Total395100.00%17100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_store_direct_to_node * * PARAMETERS: source_desc - Value to be stored * node - Named object to receive the value * walk_state - Current walk state * * RETURN: Status * * DESCRIPTION: "Store" an object directly to a node. This involves a copy * and an attach. * ******************************************************************************/
static acpi_status acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc, struct acpi_namespace_node *node, struct acpi_walk_state *walk_state) { acpi_status status; union acpi_operand_object *new_desc; ACPI_FUNCTION_TRACE(ex_store_direct_to_node); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing [%s] (%p) directly into node [%s] (%p)" " with no implicit conversion\n", acpi_ut_get_object_type_name(source_desc), source_desc, acpi_ut_get_type_name(node->type), node)); /* Copy the source object to a new object */ status = acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Attach the new object to the node */ status = acpi_ns_attach_object(node, new_desc, new_desc->common.type); acpi_ut_remove_reference(new_desc); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore8171.68%337.50%
Linus Torvalds2623.01%225.00%
Linus Torvalds (pre-git)43.54%112.50%
Andy Grover21.77%225.00%
Total113100.00%8100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore38730.84%1435.00%
Linus Torvalds38730.84%512.50%
Linus Torvalds (pre-git)20516.33%25.00%
Andy Grover13410.68%1127.50%
Len Brown1128.92%512.50%
Lin Ming292.31%25.00%
Patrick Mochel10.08%12.50%
Total1255100.00%40100.00%
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