diff options
Diffstat (limited to 'drivers/acpi/dispatcher/dsopcode.c')
| -rw-r--r-- | drivers/acpi/dispatcher/dsopcode.c | 1151 |
1 files changed, 1151 insertions, 0 deletions
diff --git a/drivers/acpi/dispatcher/dsopcode.c b/drivers/acpi/dispatcher/dsopcode.c new file mode 100644 index 00000000000..5c987a0e7b7 --- /dev/null +++ b/drivers/acpi/dispatcher/dsopcode.c @@ -0,0 +1,1151 @@ +/****************************************************************************** + * + * Module Name: dsopcode - Dispatcher Op Region support and handling of + * "control" opcodes + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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 <acpi/acparser.h> +#include <acpi/amlcode.h> +#include <acpi/acdispat.h> +#include <acpi/acinterp.h> +#include <acpi/acnamesp.h> +#include <acpi/acevents.h> + +#define _COMPONENT ACPI_DISPATCHER + ACPI_MODULE_NAME ("dsopcode") + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_execute_arguments + * + * PARAMETERS: Node - Parent NS node + * aml_length - Length of executable AML + * aml_start - Pointer to the AML + * + * RETURN: Status. + * + * DESCRIPTION: Late (deferred) execution of region or field arguments + * + ****************************************************************************/ + +acpi_status +acpi_ds_execute_arguments ( + struct acpi_namespace_node *node, + struct acpi_namespace_node *scope_node, + u32 aml_length, + u8 *aml_start) +{ + acpi_status status; + union acpi_parse_object *op; + struct acpi_walk_state *walk_state; + + + ACPI_FUNCTION_TRACE ("ds_execute_arguments"); + + + /* + * Allocate a new parser op to be the root of the parsed tree + */ + op = acpi_ps_alloc_op (AML_INT_EVAL_SUBTREE_OP); + if (!op) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Save the Node for use in acpi_ps_parse_aml */ + + op->common.node = scope_node; + + /* Create and initialize a new parser state */ + + walk_state = acpi_ds_create_walk_state (0, NULL, NULL, NULL); + if (!walk_state) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + status = acpi_ds_init_aml_walk (walk_state, op, NULL, aml_start, + aml_length, NULL, 1); + if (ACPI_FAILURE (status)) { + acpi_ds_delete_walk_state (walk_state); + return_ACPI_STATUS (status); + } + + /* Mark this parse as a deferred opcode */ + + walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP; + walk_state->deferred_node = node; + + /* Pass1: Parse the entire declaration */ + + status = acpi_ps_parse_aml (walk_state); + if (ACPI_FAILURE (status)) { + acpi_ps_delete_parse_tree (op); + return_ACPI_STATUS (status); + } + + /* Get and init the Op created above */ + + op->common.node = node; + acpi_ps_delete_parse_tree (op); + + /* Evaluate the deferred arguments */ + + op = acpi_ps_alloc_op (AML_INT_EVAL_SUBTREE_OP); + if (!op) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + op->common.node = scope_node; + + /* Create and initialize a new parser state */ + + walk_state = acpi_ds_create_walk_state (0, NULL, NULL, NULL); + if (!walk_state) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Execute the opcode and arguments */ + + status = acpi_ds_init_aml_walk (walk_state, op, NULL, aml_start, + aml_length, NULL, 3); + if (ACPI_FAILURE (status)) { + acpi_ds_delete_walk_state (walk_state); + return_ACPI_STATUS (status); + } + + /* Mark this execution as a deferred opcode */ + + walk_state->deferred_node = node; + status = acpi_ps_parse_aml (walk_state); + acpi_ps_delete_parse_tree (op); + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_get_buffer_field_arguments + * + * PARAMETERS: obj_desc - A valid buffer_field object + * + * RETURN: Status. + * + * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late + * evaluation of these field attributes. + * + ****************************************************************************/ + +acpi_status +acpi_ds_get_buffer_field_arguments ( + union acpi_operand_object *obj_desc) +{ + union acpi_operand_object *extra_desc; + struct acpi_namespace_node *node; + acpi_status status; + + + ACPI_FUNCTION_TRACE_PTR ("ds_get_buffer_field_arguments", obj_desc); + + + if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { + return_ACPI_STATUS (AE_OK); + } + + /* Get the AML pointer (method object) and buffer_field node */ + + extra_desc = acpi_ns_get_secondary_object (obj_desc); + node = obj_desc->buffer_field.node; + + ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_BUFFER_FIELD, node, NULL)); + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s] buffer_field Arg Init\n", + acpi_ut_get_node_name (node))); + + /* Execute the AML code for the term_arg arguments */ + + status = acpi_ds_execute_arguments (node, acpi_ns_get_parent_node (node), + extra_desc->extra.aml_length, extra_desc->extra.aml_start); + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_get_buffer_arguments + * + * PARAMETERS: obj_desc - A valid Buffer object + * + * RETURN: Status. + * + * DESCRIPTION: Get Buffer length and initializer byte list. This implements + * the late evaluation of these attributes. + * + ****************************************************************************/ + +acpi_status +acpi_ds_get_buffer_arguments ( + union acpi_operand_object *obj_desc) +{ + struct acpi_namespace_node *node; + acpi_status status; + + + ACPI_FUNCTION_TRACE_PTR ("ds_get_buffer_arguments", obj_desc); + + + if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { + return_ACPI_STATUS (AE_OK); + } + + /* Get the Buffer node */ + + node = obj_desc->buffer.node; + if (!node) { + ACPI_REPORT_ERROR (( + "No pointer back to NS node in buffer obj %p\n", obj_desc)); + return_ACPI_STATUS (AE_AML_INTERNAL); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Buffer Arg Init\n")); + + /* Execute the AML code for the term_arg arguments */ + + status = acpi_ds_execute_arguments (node, node, + obj_desc->buffer.aml_length, obj_desc->buffer.aml_start); + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_get_package_arguments + * + * PARAMETERS: obj_desc - A valid Package object + * + * RETURN: Status. + * + * DESCRIPTION: Get Package length and initializer byte list. This implements + * the late evaluation of these attributes. + * + ****************************************************************************/ + +acpi_status +acpi_ds_get_package_arguments ( + union acpi_operand_object *obj_desc) +{ + struct acpi_namespace_node *node; + acpi_status status; + + + ACPI_FUNCTION_TRACE_PTR ("ds_get_package_arguments", obj_desc); + + + if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { + return_ACPI_STATUS (AE_OK); + } + + /* Get the Package node */ + + node = obj_desc->package.node; + if (!node) { + ACPI_REPORT_ERROR (( + "No pointer back to NS node in package %p\n", obj_desc)); + return_ACPI_STATUS (AE_AML_INTERNAL); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Package Arg Init\n")); + + /* Execute the AML code for the term_arg arguments */ + + status = acpi_ds_execute_arguments (node, node, + obj_desc->package.aml_length, obj_desc->package.aml_start); + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_get_region_arguments + * + * PARAMETERS: obj_desc - A valid region object + * + * RETURN: Status. + * + * DESCRIPTION: Get region address and length. This implements the late + * evaluation of these region attributes. + * + ****************************************************************************/ + +acpi_status +acpi_ds_get_region_arguments ( + union acpi_operand_object *obj_desc) +{ + struct acpi_namespace_node *node; + acpi_status status; + union acpi_operand_object *extra_desc; + + + ACPI_FUNCTION_TRACE_PTR ("ds_get_region_arguments", obj_desc); + + + if (obj_desc->region.flags & AOPOBJ_DATA_VALID) { + return_ACPI_STATUS (AE_OK); + } + + extra_desc = acpi_ns_get_secondary_object (obj_desc); + if (!extra_desc) { + return_ACPI_STATUS (AE_NOT_EXIST); + } + + /* Get the Region node */ + + node = obj_desc->region.node; + + ACPI_DEBUG_EXEC (acpi_ut_display_init_pathname (ACPI_TYPE_REGION, node, NULL)); + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s] op_region Arg Init at AML %p\n", + acpi_ut_get_node_name (node), extra_desc->extra.aml_start)); + + /* Execute the argument AML */ + + status = acpi_ds_execute_arguments (node, acpi_ns_get_parent_node (node), + extra_desc->extra.aml_length, extra_desc->extra.aml_start); + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_initialize_region + * + * PARAMETERS: Op - A valid region Op object + * + * RETURN: Status + * + * DESCRIPTION: Front end to ev_initialize_region + * + ****************************************************************************/ + +acpi_status +acpi_ds_initialize_region ( + acpi_handle obj_handle) +{ + union acpi_operand_object *obj_desc; + acpi_status status; + + + obj_desc = acpi_ns_get_attached_object (obj_handle); + + /* Namespace is NOT locked */ + + status = acpi_ev_initialize_region (obj_desc, FALSE); + return (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_init_buffer_field + * + * PARAMETERS: aml_opcode - create_xxx_field + * obj_desc - buffer_field object + * buffer_desc - Host Buffer + * offset_desc - Offset into buffer + * Length - Length of field (CREATE_FIELD_OP only) + * Result - Where to store the result + * + * RETURN: Status + * + * DESCRIPTION: Perform actual initialization of a buffer field + * + ****************************************************************************/ + +acpi_status +acpi_ds_init_buffer_field ( + u16 aml_opcode, + union acpi_operand_object *obj_desc, + union acpi_operand_object *buffer_desc, + union acpi_operand_object *offset_desc, + union acpi_operand_object *length_desc, + union acpi_operand_object *result_desc) +{ + u32 offset; + u32 bit_offset; + u32 bit_count; + u8 field_flags; + acpi_status status; + + + ACPI_FUNCTION_TRACE_PTR ("ds_init_buffer_field", obj_desc); + + + /* Host object must be a Buffer */ + + if (ACPI_GET_OBJECT_TYPE (buffer_desc) != ACPI_TYPE_BUFFER) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Target of Create Field is not a Buffer object - %s\n", + acpi_ut_get_object_type_name (buffer_desc))); + + status = AE_AML_OPERAND_TYPE; + goto cleanup; + } + + /* + * The last parameter to all of these opcodes (result_desc) started + * out as a name_string, and should therefore now be a NS node + * after resolution in acpi_ex_resolve_operands(). + */ + if (ACPI_GET_DESCRIPTOR_TYPE (result_desc) != ACPI_DESC_TYPE_NAMED) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) destination not a NS Node [%s]\n", + acpi_ps_get_opcode_name (aml_opcode), acpi_ut_get_descriptor_name (result_desc))); + + status = AE_AML_OPERAND_TYPE; + goto cleanup; + } + + offset = (u32) offset_desc->integer.value; + + /* + * Setup the Bit offsets and counts, according to the opcode + */ + switch (aml_opcode) { + case AML_CREATE_FIELD_OP: + + /* Offset is in bits, count is in bits */ + + bit_offset = offset; + bit_count = (u32) length_desc->integer.value; + field_flags = AML_FIELD_ACCESS_BYTE; + break; + + case AML_CREATE_BIT_FIELD_OP: + + /* Offset is in bits, Field is one bit */ + + bit_offset = offset; + bit_count = 1; + field_flags = AML_FIELD_ACCESS_BYTE; + break; + + case AML_CREATE_BYTE_FIELD_OP: + + /* Offset is in bytes, field is one byte */ + + bit_offset = 8 * offset; + bit_count = 8; + field_flags = AML_FIELD_ACCESS_BYTE; + break; + + case AML_CREATE_WORD_FIELD_OP: + + /* Offset is in bytes, field is one word */ + + bit_offset = 8 * offset; + bit_count = 16; + field_flags = AML_FIELD_ACCESS_WORD; + break; + + case AML_CREATE_DWORD_FIELD_OP: + + /* Offset is in bytes, field is one dword */ + + bit_offset = 8 * offset; + bit_count = 32; + field_flags = AML_FIELD_ACCESS_DWORD; + break; + + case AML_CREATE_QWORD_FIELD_OP: + + /* Offset is in bytes, field is one qword */ + + bit_offset = 8 * offset; + bit_count = 64; + field_flags = AML_FIELD_ACCESS_QWORD; + break; + + default: + + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Unknown field creation opcode %02x\n", + aml_opcode)); + status = AE_AML_BAD_OPCODE; + goto cleanup; + } + + /* Entire field must fit within the current length of the buffer */ + + if ((bit_offset + bit_count) > + (8 * (u32) buffer_desc->buffer.length)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Field [%4.4s] size %d exceeds Buffer [%4.4s] size %d (bits)\n", + acpi_ut_get_node_name (result_desc), + bit_offset + bit_count, + acpi_ut_get_node_name (buffer_desc->buffer.node), + 8 * (u32) buffer_desc->buffer.length)); + status = AE_AML_BUFFER_LIMIT; + goto cleanup; + } + + /* + * Initialize areas of the field object that are common to all fields + * For field_flags, use LOCK_RULE = 0 (NO_LOCK), UPDATE_RULE = 0 (UPDATE_PRESERVE) + */ + status = acpi_ex_prep_common_field_object (obj_desc, field_flags, 0, + bit_offset, bit_count); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + obj_desc->buffer_field.buffer_obj = buffer_desc; + + /* Reference count for buffer_desc inherits obj_desc count */ + + buffer_desc->common.reference_count = (u16) (buffer_desc->common.reference_count + + obj_desc->common.reference_count); + + +cleanup: + + /* Always delete the operands */ + + acpi_ut_remove_reference (offset_desc); + acpi_ut_remove_reference (buffer_desc); + + if (aml_opcode == AML_CREATE_FIELD_OP) { + acpi_ut_remove_reference (length_desc); + } + + /* On failure, delete the result descriptor */ + + if (ACPI_FAILURE (status)) { + acpi_ut_remove_reference (result_desc); /* Result descriptor */ + } + else { + /* Now the address and length are valid for this buffer_field */ + + obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID; + } + + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_eval_buffer_field_operands + * + * PARAMETERS: walk_state - Current walk + * Op - A valid buffer_field Op object + * + * RETURN: Status + * + * DESCRIPTION: Get buffer_field Buffer and Index + * Called from acpi_ds_exec_end_op during buffer_field parse tree walk + * + ****************************************************************************/ + +acpi_status +acpi_ds_eval_buffer_field_operands ( + struct acpi_walk_state *walk_state, + union acpi_parse_object *op) +{ + acpi_status status; + union acpi_operand_object *obj_desc; + struct acpi_namespace_node *node; + union acpi_parse_object *next_op; + + + ACPI_FUNCTION_TRACE_PTR ("ds_eval_buffer_field_operands", op); + + + /* + * This is where we evaluate the address and length fields of the + * create_xxx_field declaration + */ + node = op->common.node; + + /* next_op points to the op that holds the Buffer */ + + next_op = op->common.value.arg; + + /* Evaluate/create the address and length operands */ + + status = acpi_ds_create_operands (walk_state, next_op); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + obj_desc = acpi_ns_get_attached_object (node); + if (!obj_desc) { + return_ACPI_STATUS (AE_NOT_EXIST); + } + + /* Resolve the operands */ + + status = acpi_ex_resolve_operands (op->common.aml_opcode, + ACPI_WALK_OPERANDS, walk_state); + + ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE, + acpi_ps_get_opcode_name (op->common.aml_opcode), + walk_state->num_operands, "after acpi_ex_resolve_operands"); + + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) bad operand(s) (%X)\n", + acpi_ps_get_opcode_name (op->common.aml_opcode), status)); + + return_ACPI_STATUS (status); + } + + /* Initialize the Buffer Field */ + + if (op->common.aml_opcode == AML_CREATE_FIELD_OP) { + /* NOTE: Slightly different operands for this opcode */ + + status = acpi_ds_init_buffer_field (op->common.aml_opcode, obj_desc, + walk_state->operands[0], walk_state->operands[1], + walk_state->operands[2], walk_state->operands[3]); + } + else { + /* All other, create_xxx_field opcodes */ + + status = acpi_ds_init_buffer_field (op->common.aml_opcode, obj_desc, + walk_state->operands[0], walk_state->operands[1], + NULL, walk_state->operands[2]); + } + + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_eval_region_operands + * + * PARAMETERS: walk_state - Current walk + * Op - A valid region Op object + * + * RETURN: Status + * + * DESCRIPTION: Get region address and length + * Called from acpi_ds_exec_end_op during op_region parse tree walk + * + ****************************************************************************/ + +acpi_status +acpi_ds_eval_region_operands ( + struct acpi_walk_state *walk_state, + union acpi_parse_object *op) +{ + acpi_status status; + union acpi_operand_object *obj_desc; + union acpi_operand_object *operand_desc; + struct acpi_namespace_node *node; + union acpi_parse_object *next_op; + + + ACPI_FUNCTION_TRACE_PTR ("ds_eval_region_operands", op); + + + /* + * This is where we evaluate the address and length fields of the op_region declaration + */ + node = op->common.node; + + /* next_op points to the op that holds the space_iD */ + + next_op = op->common.value.arg; + + /* next_op points to address op */ + + next_op = next_op->common.next; + + /* Evaluate/create the address and length operands */ + + status = acpi_ds_create_operands (walk_state, next_op); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* Resolve the length and address operands to numbers */ + + status = acpi_ex_resolve_operands (op->common.aml_opcode, ACPI_WALK_OPERANDS, walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE, + acpi_ps_get_opcode_name (op->common.aml_opcode), + 1, "after acpi_ex_resolve_operands"); + + obj_desc = acpi_ns_get_attached_object (node); + if (!obj_desc) { + return_ACPI_STATUS (AE_NOT_EXIST); + } + + /* + * Get the length operand and save it + * (at Top of stack) + */ + operand_desc = walk_state->operands[walk_state->num_operands - 1]; + + obj_desc->region.length = (u32) operand_desc->integer.value; + acpi_ut_remove_reference (operand_desc); + + /* + * Get the address and save it + * (at top of stack - 1) + */ + operand_desc = walk_state->operands[walk_state->num_operands - 2]; + + obj_desc->region.address = (acpi_physical_address) operand_desc->integer.value; + acpi_ut_remove_reference (operand_desc); + + ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "rgn_obj %p Addr %8.8X%8.8X Len %X\n", + obj_desc, + ACPI_FORMAT_UINT64 (obj_desc->region.address), + obj_desc->region.length)); + + /* Now the address and length are valid for this opregion */ + + obj_desc->region.flags |= AOPOBJ_DATA_VALID; + + return_ACPI_STATUS (status); +} + + +/***************************************************************************** + * + * FUNCTION: acpi_ds_eval_data_object_operands + * + * PARAMETERS: walk_state - Current walk + * Op - A valid data_object Op object + * obj_desc - data_object + * + * RETURN: Status + * + * DESCRIPTION: Get the operands and complete the following data object types: + * Buffer, Package. + * + ****************************************************************************/ + +acpi_status +acpi_ds_eval_data_object_operands ( + struct acpi_walk_state *walk_state, + union acpi_parse_object *op, + union acpi_operand_object *obj_desc) +{ + acpi_status status; + union acpi_operand_object *arg_desc; + u32 length; + + + ACPI_FUNCTION_TRACE ("ds_eval_data_object_operands"); + + + /* The first operand (for all of these data objects) is the length */ + + status = acpi_ds_create_operand (walk_state, op->common.value.arg, 1); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + status = acpi_ex_resolve_operands (walk_state->opcode, + &(walk_state->operands [walk_state->num_operands -1]), + walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* Extract length operand */ + + arg_desc = walk_state->operands [walk_state->num_operands - 1]; + length = (u32) arg_desc->integer.value; + + /* Cleanup for length operand */ + + status = acpi_ds_obj_stack_pop (1, walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + acpi_ut_remove_reference (arg_desc); + + /* + * Create the actual data object + */ + switch (op->common.aml_opcode) { + case AML_BUFFER_OP: + + status = acpi_ds_build_internal_buffer_obj (walk_state, op, length, &obj_desc); + break; + + case AML_PACKAGE_OP: + case AML_VAR_PACKAGE_OP: + + status = acpi_ds_build_internal_package_obj (walk_state, op, length, &obj_desc); + break; + + default: + return_ACPI_STATUS (AE_AML_BAD_OPCODE); + } + + if (ACPI_SUCCESS (status)) { + /* + * Return the object in the walk_state, unless the parent is a package -- + * in this case, the return object will be stored in the parse tree + * for the package. + */ + if ((!op->common.parent) || + ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) && + (op->common.parent->common.aml_opcode != AML_VAR_PACKAGE_OP) && + (op->common.parent->common.aml_opcode != AML_NAME_OP))) { + walk_state->result_obj = obj_desc; + } + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ds_exec_begin_control_op + * + * PARAMETERS: walk_list - The list that owns the walk stack + * Op - The control Op + * + * RETURN: Status + * + * DESCRIPTION: Handles all control ops encountered during control method + * execution. + * + ******************************************************************************/ + +acpi_status +acpi_ds_exec_begin_control_op ( + struct acpi_walk_state *walk_state, + union acpi_parse_object *op) +{ + acpi_status status = AE_OK; + union acpi_generic_state *control_state; + + + ACPI_FUNCTION_NAME ("ds_exec_begin_control_op"); + + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op, + op->common.aml_opcode, walk_state)); + + switch (op->common.aml_opcode) { + case AML_IF_OP: + case AML_WHILE_OP: + + /* + * IF/WHILE: Create a new control state to manage these + * constructs. We need to manage these as a stack, in order + * to handle nesting. + */ + control_state = acpi_ut_create_control_state (); + if (!control_state) { + status = AE_NO_MEMORY; + break; + } + /* + * Save a pointer to the predicate for multiple executions + * of a loop + */ + control_state->control.aml_predicate_start = walk_state->parser_state.aml - 1; + control_state->control.package_end = walk_state->parser_state.pkg_end; + control_state->control.opcode = op->common.aml_opcode; + + + /* Push the control state on this walk's control stack */ + + acpi_ut_push_generic_state (&walk_state->control_state, control_state); + break; + + case AML_ELSE_OP: + + /* Predicate is in the state object */ + /* If predicate is true, the IF was executed, ignore ELSE part */ + + if (walk_state->last_predicate) { + status = AE_CTRL_TRUE; + } + + break; + + case AML_RETURN_OP: + + break; + + default: + break; + } + + return (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ds_exec_end_control_op + * + * PARAMETERS: walk_list - The list that owns the walk stack + * Op - The control Op + * + * RETURN: Status + * + * DESCRIPTION: Handles all control ops encountered during control method + * execution. + * + ******************************************************************************/ + +acpi_status +acpi_ds_exec_end_control_op ( + struct acpi_walk_state *walk_state, + union acpi_parse_object *op) +{ + acpi_status status = AE_OK; + union acpi_generic_state *control_state; + + + ACPI_FUNCTION_NAME ("ds_exec_end_control_op"); + + + switch (op->common.aml_opcode) { + case AML_IF_OP: + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op)); + + /* + * Save the result of the predicate in case there is an + * ELSE to come + */ + walk_state->last_predicate = + (u8) walk_state->control_state->common.value; + + /* + * Pop the control state that was created at the start + * of the IF and free it + */ + control_state = acpi_ut_pop_generic_state (&walk_state->control_state); + acpi_ut_delete_generic_state (control_state); + break; + + + case AML_ELSE_OP: + + break; + + + case AML_WHILE_OP: + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op)); + + if (walk_state->control_state->common.value) { + /* Predicate was true, go back and evaluate it again! */ + + status = AE_CTRL_PENDING; + } + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] termination! Op=%p\n", op)); + + /* Pop this control state and free it */ + + control_state = acpi_ut_pop_generic_state (&walk_state->control_state); + + walk_state->aml_last_while = control_state->control.aml_predicate_start; + acpi_ut_delete_generic_state (control_state); + break; + + + case AML_RETURN_OP: + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "[RETURN_OP] Op=%p Arg=%p\n",op, op->common.value.arg)); + + /* + * One optional operand -- the return value + * It can be either an immediate operand or a result that + * has been bubbled up the tree + */ + if (op->common.value.arg) { + /* Since we have a real Return(), delete any implicit return */ + + acpi_ds_clear_implicit_return (walk_state); + + /* Return statement has an immediate operand */ + + status = acpi_ds_create_operands (walk_state, op->common.value.arg); + if (ACPI_FAILURE (status)) { + return (status); + } + + /* + * If value being returned is a Reference (such as + * an arg or local), resolve it now because it may + * cease to exist at the end of the method. + */ + status = acpi_ex_resolve_to_value (&walk_state->operands [0], walk_state); + if (ACPI_FAILURE (status)) { + return (status); + } + + /* + * Get the return value and save as the last result + * value. This is the only place where walk_state->return_desc + * is set to anything other than zero! + */ + walk_state->return_desc = walk_state->operands[0]; + } + else if ((walk_state->results) && + (walk_state->results->results.num_results > 0)) { + /* Since we have a real Return(), delete any implicit return */ + + acpi_ds_clear_implicit_return (walk_state); + + /* + * The return value has come from a previous calculation. + * + * If value being returned is a Reference (such as + * an arg or local), resolve it now because it may + * cease to exist at the end of the method. + * + * Allow references created by the Index operator to return unchanged. + */ + if ((ACPI_GET_DESCRIPTOR_TYPE (walk_state->results->results.obj_desc[0]) == ACPI_DESC_TYPE_OPERAND) && + (ACPI_GET_OBJECT_TYPE (walk_state->results->results.obj_desc [0]) == ACPI_TYPE_LOCAL_REFERENCE) && + ((walk_state->results->results.obj_desc [0])->reference.opcode != AML_INDEX_OP)) { + status = acpi_ex_resolve_to_value (&walk_state->results->results.obj_desc [0], walk_state); + if (ACPI_FAILURE (status)) { + return (status); + } + } + + walk_state->return_desc = walk_state->results->results.obj_desc [0]; + } + else { + /* No return operand */ + + if (walk_state->num_operands) { + acpi_ut_remove_reference (walk_state->operands [0]); + } + + walk_state->operands [0] = NULL; + walk_state->num_operands = 0; + walk_state->return_desc = NULL; + } + + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Completed RETURN_OP State=%p, ret_val=%p\n", + walk_state, walk_state->return_desc)); + + /* End the control method execution right now */ + + status = AE_CTRL_TERMINATE; + break; + + + case AML_NOOP_OP: + + /* Just do nothing! */ + break; + + + case AML_BREAK_POINT_OP: + + /* Call up to the OS service layer to handle this */ + + status = acpi_os_signal (ACPI_SIGNAL_BREAKPOINT, "Executed AML Breakpoint opcode"); + + /* If and when it returns, all done. */ + + break; + + + case AML_BREAK_OP: + case AML_CONTINUE_OP: /* ACPI 2.0 */ + + + /* Pop and delete control states until we find a while */ + + while (walk_state->control_state && + (walk_state->control_state->control.opcode != AML_WHILE_OP)) { + control_state = acpi_ut_pop_generic_state (&walk_state->control_state); + acpi_ut_delete_generic_state (control_state); + } + + /* No while found? */ + + if (!walk_state->control_state) { + return (AE_AML_NO_WHILE); + } + + /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */ + + walk_state->aml_last_while = walk_state->control_state->control.package_end; + + /* Return status depending on opcode */ + + if (op->common.aml_opcode == AML_BREAK_OP) { + status = AE_CTRL_BREAK; + } + else { + status = AE_CTRL_CONTINUE; + } + break; + + + default: + + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown control opcode=%X Op=%p\n", + op->common.aml_opcode, op)); + + status = AE_AML_BAD_OPCODE; + break; + } + + return (status); +} + |