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linux/drivers/acpi/dispatcher/dsopcode.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1152 lines
31 KiB
C
Raw Blame History

/******************************************************************************
*
* 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);
}
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