diff options
Diffstat (limited to 'drivers/acpi/acpica/dsobject.c')
| -rw-r--r-- | drivers/acpi/acpica/dsobject.c | 813 |
1 files changed, 813 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/dsobject.c b/drivers/acpi/acpica/dsobject.c new file mode 100644 index 00000000000..15c628e6aa0 --- /dev/null +++ b/drivers/acpi/acpica/dsobject.c @@ -0,0 +1,813 @@ +/****************************************************************************** + * + * Module Name: dsobject - Dispatcher object management routines + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, 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 "acparser.h" +#include "amlcode.h" +#include "acdispat.h" +#include "acnamesp.h" +#include "acinterp.h" + +#define _COMPONENT ACPI_DISPATCHER +ACPI_MODULE_NAME("dsobject") + +/* Local prototypes */ +static acpi_status +acpi_ds_build_internal_object(struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + union acpi_operand_object **obj_desc_ptr); + +#ifndef ACPI_NO_METHOD_EXECUTION +/******************************************************************************* + * + * FUNCTION: acpi_ds_build_internal_object + * + * PARAMETERS: walk_state - Current walk state + * Op - Parser object to be translated + * obj_desc_ptr - Where the ACPI internal object is returned + * + * RETURN: Status + * + * DESCRIPTION: Translate a parser Op object to the equivalent namespace object + * Simple objects are any objects other than a package object! + * + ******************************************************************************/ + +static acpi_status +acpi_ds_build_internal_object(struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + union acpi_operand_object **obj_desc_ptr) +{ + union acpi_operand_object *obj_desc; + acpi_status status; + + ACPI_FUNCTION_TRACE(ds_build_internal_object); + + *obj_desc_ptr = NULL; + if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) { + /* + * This is a named object reference. If this name was + * previously looked up in the namespace, it was stored in this op. + * Otherwise, go ahead and look it up now + */ + if (!op->common.node) { + status = acpi_ns_lookup(walk_state->scope_info, + op->common.value.string, + ACPI_TYPE_ANY, + ACPI_IMODE_EXECUTE, + ACPI_NS_SEARCH_PARENT | + ACPI_NS_DONT_OPEN_SCOPE, NULL, + ACPI_CAST_INDIRECT_PTR(struct + acpi_namespace_node, + &(op-> + common. + node))); + if (ACPI_FAILURE(status)) { + + /* Check if we are resolving a named reference within a package */ + + if ((status == AE_NOT_FOUND) + && (acpi_gbl_enable_interpreter_slack) + && + ((op->common.parent->common.aml_opcode == + AML_PACKAGE_OP) + || (op->common.parent->common.aml_opcode == + AML_VAR_PACKAGE_OP))) { + /* + * We didn't find the target and we are populating elements + * of a package - ignore if slack enabled. Some ASL code + * contains dangling invalid references in packages and + * expects that no exception will be issued. Leave the + * element as a null element. It cannot be used, but it + * can be overwritten by subsequent ASL code - this is + * typically the case. + */ + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Ignoring unresolved reference in package [%4.4s]\n", + walk_state-> + scope_info->scope. + node->name.ascii)); + + return_ACPI_STATUS(AE_OK); + } else { + ACPI_ERROR_NAMESPACE(op->common.value. + string, status); + } + + return_ACPI_STATUS(status); + } + } + + /* Special object resolution for elements of a package */ + + if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || + (op->common.parent->common.aml_opcode == + AML_VAR_PACKAGE_OP)) { + /* + * Attempt to resolve the node to a value before we insert it into + * the package. If this is a reference to a common data type, + * resolve it immediately. According to the ACPI spec, package + * elements can only be "data objects" or method references. + * Attempt to resolve to an Integer, Buffer, String or Package. + * If cannot, return the named reference (for things like Devices, + * Methods, etc.) Buffer Fields and Fields will resolve to simple + * objects (int/buf/str/pkg). + * + * NOTE: References to things like Devices, Methods, Mutexes, etc. + * will remain as named references. This behavior is not described + * in the ACPI spec, but it appears to be an oversight. + */ + obj_desc = + ACPI_CAST_PTR(union acpi_operand_object, + op->common.node); + + status = + acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR + (struct + acpi_namespace_node, + &obj_desc), + walk_state); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + switch (op->common.node->type) { + /* + * For these types, we need the actual node, not the subobject. + * However, the subobject did not get an extra reference count above. + * + * TBD: should ex_resolve_node_to_value be changed to fix this? + */ + case ACPI_TYPE_DEVICE: + case ACPI_TYPE_THERMAL: + + acpi_ut_add_reference(op->common.node->object); + + /*lint -fallthrough */ + /* + * For these types, we need the actual node, not the subobject. + * The subobject got an extra reference count in ex_resolve_node_to_value. + */ + case ACPI_TYPE_MUTEX: + case ACPI_TYPE_METHOD: + case ACPI_TYPE_POWER: + case ACPI_TYPE_PROCESSOR: + case ACPI_TYPE_EVENT: + case ACPI_TYPE_REGION: + + /* We will create a reference object for these types below */ + break; + + default: + /* + * All other types - the node was resolved to an actual + * object, we are done. + */ + goto exit; + } + } + } + + /* Create and init a new internal ACPI object */ + + obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info + (op->common.aml_opcode))-> + object_type); + if (!obj_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + status = + acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode, + &obj_desc); + if (ACPI_FAILURE(status)) { + acpi_ut_remove_reference(obj_desc); + return_ACPI_STATUS(status); + } + + exit: + *obj_desc_ptr = obj_desc; + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ds_build_internal_buffer_obj + * + * PARAMETERS: walk_state - Current walk state + * Op - Parser object to be translated + * buffer_length - Length of the buffer + * obj_desc_ptr - Where the ACPI internal object is returned + * + * RETURN: Status + * + * DESCRIPTION: Translate a parser Op package object to the equivalent + * namespace object + * + ******************************************************************************/ + +acpi_status +acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + u32 buffer_length, + union acpi_operand_object **obj_desc_ptr) +{ + union acpi_parse_object *arg; + union acpi_operand_object *obj_desc; + union acpi_parse_object *byte_list; + u32 byte_list_length = 0; + + ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj); + + /* + * If we are evaluating a Named buffer object "Name (xxxx, Buffer)". + * The buffer object already exists (from the NS node), otherwise it must + * be created. + */ + obj_desc = *obj_desc_ptr; + if (!obj_desc) { + + /* Create a new buffer object */ + + obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER); + *obj_desc_ptr = obj_desc; + if (!obj_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + } + + /* + * Second arg is the buffer data (optional) byte_list can be either + * individual bytes or a string initializer. In either case, a + * byte_list appears in the AML. + */ + arg = op->common.value.arg; /* skip first arg */ + + byte_list = arg->named.next; + if (byte_list) { + if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) { + ACPI_ERROR((AE_INFO, + "Expecting bytelist, got AML opcode %X in op %p", + byte_list->common.aml_opcode, byte_list)); + + acpi_ut_remove_reference(obj_desc); + return (AE_TYPE); + } + + byte_list_length = (u32) byte_list->common.value.integer; + } + + /* + * The buffer length (number of bytes) will be the larger of: + * 1) The specified buffer length and + * 2) The length of the initializer byte list + */ + obj_desc->buffer.length = buffer_length; + if (byte_list_length > buffer_length) { + obj_desc->buffer.length = byte_list_length; + } + + /* Allocate the buffer */ + + if (obj_desc->buffer.length == 0) { + obj_desc->buffer.pointer = NULL; + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "Buffer defined with zero length in AML, creating\n")); + } else { + obj_desc->buffer.pointer = + ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length); + if (!obj_desc->buffer.pointer) { + acpi_ut_delete_object_desc(obj_desc); + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Initialize buffer from the byte_list (if present) */ + + if (byte_list) { + ACPI_MEMCPY(obj_desc->buffer.pointer, + byte_list->named.data, byte_list_length); + } + } + + obj_desc->buffer.flags |= AOPOBJ_DATA_VALID; + op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc); + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ds_build_internal_package_obj + * + * PARAMETERS: walk_state - Current walk state + * Op - Parser object to be translated + * element_count - Number of elements in the package - this is + * the num_elements argument to Package() + * obj_desc_ptr - Where the ACPI internal object is returned + * + * RETURN: Status + * + * DESCRIPTION: Translate a parser Op package object to the equivalent + * namespace object + * + * NOTE: The number of elements in the package will be always be the num_elements + * count, regardless of the number of elements in the package list. If + * num_elements is smaller, only that many package list elements are used. + * if num_elements is larger, the Package object is padded out with + * objects of type Uninitialized (as per ACPI spec.) + * + * Even though the ASL compilers do not allow num_elements to be smaller + * than the Package list length (for the fixed length package opcode), some + * BIOS code modifies the AML on the fly to adjust the num_elements, and + * this code compensates for that. This also provides compatibility with + * other AML interpreters. + * + ******************************************************************************/ + +acpi_status +acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + u32 element_count, + union acpi_operand_object **obj_desc_ptr) +{ + union acpi_parse_object *arg; + union acpi_parse_object *parent; + union acpi_operand_object *obj_desc = NULL; + acpi_status status = AE_OK; + unsigned i; + u16 index; + u16 reference_count; + + ACPI_FUNCTION_TRACE(ds_build_internal_package_obj); + + /* Find the parent of a possibly nested package */ + + parent = op->common.parent; + while ((parent->common.aml_opcode == AML_PACKAGE_OP) || + (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) { + parent = parent->common.parent; + } + + /* + * If we are evaluating a Named package object "Name (xxxx, Package)", + * the package object already exists, otherwise it must be created. + */ + obj_desc = *obj_desc_ptr; + if (!obj_desc) { + obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE); + *obj_desc_ptr = obj_desc; + if (!obj_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + obj_desc->package.node = parent->common.node; + } + + /* + * Allocate the element array (array of pointers to the individual + * objects) based on the num_elements parameter. Add an extra pointer slot + * so that the list is always null terminated. + */ + obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size) + element_count + + 1) * sizeof(void *)); + + if (!obj_desc->package.elements) { + acpi_ut_delete_object_desc(obj_desc); + return_ACPI_STATUS(AE_NO_MEMORY); + } + + obj_desc->package.count = element_count; + + /* + * Initialize the elements of the package, up to the num_elements count. + * Package is automatically padded with uninitialized (NULL) elements + * if num_elements is greater than the package list length. Likewise, + * Package is truncated if num_elements is less than the list length. + */ + arg = op->common.value.arg; + arg = arg->common.next; + for (i = 0; arg && (i < element_count); i++) { + if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { + if (arg->common.node->type == ACPI_TYPE_METHOD) { + /* + * A method reference "looks" to the parser to be a method + * invocation, so we special case it here + */ + arg->common.aml_opcode = AML_INT_NAMEPATH_OP; + status = + acpi_ds_build_internal_object(walk_state, + arg, + &obj_desc-> + package. + elements[i]); + } else { + /* This package element is already built, just get it */ + + obj_desc->package.elements[i] = + ACPI_CAST_PTR(union acpi_operand_object, + arg->common.node); + } + } else { + status = acpi_ds_build_internal_object(walk_state, arg, + &obj_desc-> + package. + elements[i]); + } + + if (*obj_desc_ptr) { + + /* Existing package, get existing reference count */ + + reference_count = + (*obj_desc_ptr)->common.reference_count; + if (reference_count > 1) { + + /* Make new element ref count match original ref count */ + + for (index = 0; index < (reference_count - 1); + index++) { + acpi_ut_add_reference((obj_desc-> + package. + elements[i])); + } + } + } + + arg = arg->common.next; + } + + /* Check for match between num_elements and actual length of package_list */ + + if (arg) { + /* + * num_elements was exhausted, but there are remaining elements in the + * package_list. + * + * Note: technically, this is an error, from ACPI spec: "It is an error + * for NumElements to be less than the number of elements in the + * PackageList". However, for now, we just print an error message and + * no exception is returned. + */ + while (arg) { + + /* Find out how many elements there really are */ + + i++; + arg = arg->common.next; + } + + ACPI_WARNING((AE_INFO, + "Package List length (%X) larger than NumElements count (%X), truncated\n", + i, element_count)); + } else if (i < element_count) { + /* + * Arg list (elements) was exhausted, but we did not reach num_elements count. + * Note: this is not an error, the package is padded out with NULLs. + */ + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Package List length (%X) smaller than NumElements count (%X), padded with null elements\n", + i, element_count)); + } + + obj_desc->package.flags |= AOPOBJ_DATA_VALID; + op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ds_create_node + * + * PARAMETERS: walk_state - Current walk state + * Node - NS Node to be initialized + * Op - Parser object to be translated + * + * RETURN: Status + * + * DESCRIPTION: Create the object to be associated with a namespace node + * + ******************************************************************************/ + +acpi_status +acpi_ds_create_node(struct acpi_walk_state *walk_state, + struct acpi_namespace_node *node, + union acpi_parse_object *op) +{ + acpi_status status; + union acpi_operand_object *obj_desc; + + ACPI_FUNCTION_TRACE_PTR(ds_create_node, op); + + /* + * Because of the execution pass through the non-control-method + * parts of the table, we can arrive here twice. Only init + * the named object node the first time through + */ + if (acpi_ns_get_attached_object(node)) { + return_ACPI_STATUS(AE_OK); + } + + if (!op->common.value.arg) { + + /* No arguments, there is nothing to do */ + + return_ACPI_STATUS(AE_OK); + } + + /* Build an internal object for the argument(s) */ + + status = acpi_ds_build_internal_object(walk_state, op->common.value.arg, + &obj_desc); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Re-type the object according to its argument */ + + node->type = ACPI_GET_OBJECT_TYPE(obj_desc); + + /* Attach obj to node */ + + status = acpi_ns_attach_object(node, obj_desc, node->type); + + /* Remove local reference to the object */ + + acpi_ut_remove_reference(obj_desc); + return_ACPI_STATUS(status); +} + +#endif /* ACPI_NO_METHOD_EXECUTION */ + +/******************************************************************************* + * + * FUNCTION: acpi_ds_init_object_from_op + * + * PARAMETERS: walk_state - Current walk state + * Op - Parser op used to init the internal object + * Opcode - AML opcode associated with the object + * ret_obj_desc - Namespace object to be initialized + * + * RETURN: Status + * + * DESCRIPTION: Initialize a namespace object from a parser Op and its + * associated arguments. The namespace object is a more compact + * representation of the Op and its arguments. + * + ******************************************************************************/ + +acpi_status +acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + u16 opcode, + union acpi_operand_object **ret_obj_desc) +{ + const struct acpi_opcode_info *op_info; + union acpi_operand_object *obj_desc; + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE(ds_init_object_from_op); + + obj_desc = *ret_obj_desc; + op_info = acpi_ps_get_opcode_info(opcode); + if (op_info->class == AML_CLASS_UNKNOWN) { + + /* Unknown opcode */ + + return_ACPI_STATUS(AE_TYPE); + } + + /* Perform per-object initialization */ + + switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { + case ACPI_TYPE_BUFFER: + + /* + * Defer evaluation of Buffer term_arg operand + */ + obj_desc->buffer.node = + ACPI_CAST_PTR(struct acpi_namespace_node, + walk_state->operands[0]); + obj_desc->buffer.aml_start = op->named.data; + obj_desc->buffer.aml_length = op->named.length; + break; + + case ACPI_TYPE_PACKAGE: + + /* + * Defer evaluation of Package term_arg operand + */ + obj_desc->package.node = + ACPI_CAST_PTR(struct acpi_namespace_node, + walk_state->operands[0]); + obj_desc->package.aml_start = op->named.data; + obj_desc->package.aml_length = op->named.length; + break; + + case ACPI_TYPE_INTEGER: + + switch (op_info->type) { + case AML_TYPE_CONSTANT: + /* + * Resolve AML Constants here - AND ONLY HERE! + * All constants are integers. + * We mark the integer with a flag that indicates that it started + * life as a constant -- so that stores to constants will perform + * as expected (noop). zero_op is used as a placeholder for optional + * target operands. + */ + obj_desc->common.flags = AOPOBJ_AML_CONSTANT; + + switch (opcode) { + case AML_ZERO_OP: + + obj_desc->integer.value = 0; + break; + + case AML_ONE_OP: + + obj_desc->integer.value = 1; + break; + + case AML_ONES_OP: + + obj_desc->integer.value = ACPI_INTEGER_MAX; + + /* Truncate value if we are executing from a 32-bit ACPI table */ + +#ifndef ACPI_NO_METHOD_EXECUTION + acpi_ex_truncate_for32bit_table(obj_desc); +#endif + break; + + case AML_REVISION_OP: + + obj_desc->integer.value = ACPI_CA_VERSION; + break; + + default: + + ACPI_ERROR((AE_INFO, + "Unknown constant opcode %X", + opcode)); + status = AE_AML_OPERAND_TYPE; + break; + } + break; + + case AML_TYPE_LITERAL: + + obj_desc->integer.value = op->common.value.integer; +#ifndef ACPI_NO_METHOD_EXECUTION + acpi_ex_truncate_for32bit_table(obj_desc); +#endif + break; + + default: + ACPI_ERROR((AE_INFO, "Unknown Integer type %X", + op_info->type)); + status = AE_AML_OPERAND_TYPE; + break; + } + break; + + case ACPI_TYPE_STRING: + + obj_desc->string.pointer = op->common.value.string; + obj_desc->string.length = + (u32) ACPI_STRLEN(op->common.value.string); + + /* + * The string is contained in the ACPI table, don't ever try + * to delete it + */ + obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; + break; + + case ACPI_TYPE_METHOD: + break; + + case ACPI_TYPE_LOCAL_REFERENCE: + + switch (op_info->type) { + case AML_TYPE_LOCAL_VARIABLE: + + /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */ + + obj_desc->reference.value = opcode - AML_LOCAL_OP; + obj_desc->reference.class = ACPI_REFCLASS_LOCAL; + +#ifndef ACPI_NO_METHOD_EXECUTION + status = + acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL, + obj_desc->reference. + value, walk_state, + ACPI_CAST_INDIRECT_PTR + (struct + acpi_namespace_node, + &obj_desc->reference. + object)); +#endif + break; + + case AML_TYPE_METHOD_ARGUMENT: + + /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */ + + obj_desc->reference.value = opcode - AML_ARG_OP; + obj_desc->reference.class = ACPI_REFCLASS_ARG; + +#ifndef ACPI_NO_METHOD_EXECUTION + status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG, + obj_desc-> + reference.value, + walk_state, + ACPI_CAST_INDIRECT_PTR + (struct + acpi_namespace_node, + &obj_desc-> + reference. + object)); +#endif + break; + + default: /* Object name or Debug object */ + + switch (op->common.aml_opcode) { + case AML_INT_NAMEPATH_OP: + + /* Node was saved in Op */ + + obj_desc->reference.node = op->common.node; + obj_desc->reference.object = + op->common.node->object; + obj_desc->reference.class = ACPI_REFCLASS_NAME; + break; + + case AML_DEBUG_OP: + + obj_desc->reference.class = ACPI_REFCLASS_DEBUG; + break; + + default: + + ACPI_ERROR((AE_INFO, + "Unimplemented reference type for AML opcode: %4.4X", + opcode)); + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + break; + } + break; + + default: + + ACPI_ERROR((AE_INFO, "Unimplemented data type: %X", + ACPI_GET_OBJECT_TYPE(obj_desc))); + + status = AE_AML_OPERAND_TYPE; + break; + } + + return_ACPI_STATUS(status); +} |