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linux/drivers/acpi/dispatcher/dsfield.c

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/******************************************************************************
*
* Module Name: dsfield - Dispatcher field routines
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, 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/amlcode.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsfield")
/* Local prototypes */
static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
struct acpi_walk_state *walk_state,
union acpi_parse_object *arg);
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_buffer_field
*
* PARAMETERS: Op - Current parse op (create_xXField)
* walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Execute the create_field operators:
* create_bit_field_op,
* create_byte_field_op,
* create_word_field_op,
* create_dword_field_op,
* create_qword_field_op,
* create_field_op (all of which define a field in a buffer)
*
******************************************************************************/
acpi_status
acpi_ds_create_buffer_field(union acpi_parse_object *op,
struct acpi_walk_state *walk_state)
{
union acpi_parse_object *arg;
struct acpi_namespace_node *node;
acpi_status status;
union acpi_operand_object *obj_desc;
union acpi_operand_object *second_desc = NULL;
u32 flags;
ACPI_FUNCTION_TRACE("ds_create_buffer_field");
/* Get the name_string argument */
if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
arg = acpi_ps_get_arg(op, 3);
} else {
/* Create Bit/Byte/Word/Dword field */
arg = acpi_ps_get_arg(op, 2);
}
if (!arg) {
return_ACPI_STATUS(AE_AML_NO_OPERAND);
}
if (walk_state->deferred_node) {
node = walk_state->deferred_node;
status = AE_OK;
} else {
/*
* During the load phase, we want to enter the name of the field into
* the namespace. During the execute phase (when we evaluate the size
* operand), we want to lookup the name
*/
if (walk_state->parse_flags & ACPI_PARSE_EXECUTE) {
flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE;
} else {
flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
ACPI_NS_ERROR_IF_FOUND;
}
/*
* Enter the name_string into the namespace
*/
status =
acpi_ns_lookup(walk_state->scope_info,
arg->common.value.string, ACPI_TYPE_ANY,
ACPI_IMODE_LOAD_PASS1, flags, walk_state,
&(node));
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.string, status);
return_ACPI_STATUS(status);
}
}
/* We could put the returned object (Node) on the object stack for later,
* but for now, we will put it in the "op" object that the parser uses,
* so we can get it again at the end of this scope
*/
op->common.node = node;
/*
* If there is no object attached to the node, this node was just created
* and we need to create the field object. Otherwise, this was a lookup
* of an existing node and we don't want to create the field object again.
*/
obj_desc = acpi_ns_get_attached_object(node);
if (obj_desc) {
return_ACPI_STATUS(AE_OK);
}
/*
* The Field definition is not fully parsed at this time.
* (We must save the address of the AML for the buffer and index operands)
*/
/* Create the buffer field object */
obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/*
* Remember location in AML stream of the field unit
* opcode and operands -- since the buffer and index
* operands must be evaluated.
*/
second_desc = obj_desc->common.next_object;
second_desc->extra.aml_start = op->named.data;
second_desc->extra.aml_length = op->named.length;
obj_desc->buffer_field.node = node;
/* Attach constructed field descriptors to parent node */
status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
cleanup:
/* Remove local reference to the object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_get_field_names
*
* PARAMETERS: Info - create_field info structure
* ` walk_state - Current method state
* Arg - First parser arg for the field name list
*
* RETURN: Status
*
* DESCRIPTION: Process all named fields in a field declaration. Names are
* entered into the namespace.
*
******************************************************************************/
static acpi_status
acpi_ds_get_field_names(struct acpi_create_field_info *info,
struct acpi_walk_state *walk_state,
union acpi_parse_object *arg)
{
acpi_status status;
acpi_integer position;
ACPI_FUNCTION_TRACE_PTR("ds_get_field_names", info);
/* First field starts at bit zero */
info->field_bit_position = 0;
/* Process all elements in the field list (of parse nodes) */
while (arg) {
/*
* Three types of field elements are handled:
* 1) Offset - specifies a bit offset
* 2) access_as - changes the access mode
* 3) Name - Enters a new named field into the namespace
*/
switch (arg->common.aml_opcode) {
case AML_INT_RESERVEDFIELD_OP:
position = (acpi_integer) info->field_bit_position
+ (acpi_integer) arg->common.value.size;
if (position > ACPI_UINT32_MAX) {
ACPI_REPORT_ERROR(("Bit offset within field too large (> 0xFFFFFFFF)\n"));
return_ACPI_STATUS(AE_SUPPORT);
}
info->field_bit_position = (u32) position;
break;
case AML_INT_ACCESSFIELD_OP:
/*
* Get a new access_type and access_attribute -- to be used for all
* field units that follow, until field end or another access_as
* keyword.
*
* In field_flags, preserve the flag bits other than the
* ACCESS_TYPE bits
*/
info->field_flags = (u8)
((info->
field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
((u8) ((u32) arg->common.value.integer >> 8)));
info->attribute = (u8) (arg->common.value.integer);
break;
case AML_INT_NAMEDFIELD_OP:
/* Lookup the name */
status = acpi_ns_lookup(walk_state->scope_info,
(char *)&arg->named.name,
info->field_type,
ACPI_IMODE_EXECUTE,
ACPI_NS_DONT_OPEN_SCOPE,
walk_state, &info->field_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR((char *)&arg->named.name,
status);
if (status != AE_ALREADY_EXISTS) {
return_ACPI_STATUS(status);
}
/* Already exists, ignore error */
} else {
arg->common.node = info->field_node;
info->field_bit_length = arg->common.value.size;
/* Create and initialize an object for the new Field Node */
status = acpi_ex_prep_field_value(info);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Keep track of bit position for the next field */
position = (acpi_integer) info->field_bit_position
+ (acpi_integer) arg->common.value.size;
if (position > ACPI_UINT32_MAX) {
ACPI_REPORT_ERROR(("Field [%4.4s] bit offset too large (> 0xFFFFFFFF)\n", ACPI_CAST_PTR(char, &info->field_node->name)));
return_ACPI_STATUS(AE_SUPPORT);
}
info->field_bit_position += info->field_bit_length;
break;
default:
ACPI_REPORT_ERROR(("Invalid opcode in field list: %X\n",
arg->common.aml_opcode));
return_ACPI_STATUS(AE_AML_BAD_OPCODE);
}
arg = arg->common.next;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_field
*
* PARAMETERS: Op - Op containing the Field definition and args
* region_node - Object for the containing Operation Region
* ` walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Create a new field in the specified operation region
*
******************************************************************************/
acpi_status
acpi_ds_create_field(union acpi_parse_object *op,
struct acpi_namespace_node *region_node,
struct acpi_walk_state *walk_state)
{
acpi_status status;
union acpi_parse_object *arg;
struct acpi_create_field_info info;
ACPI_FUNCTION_TRACE_PTR("ds_create_field", op);
/* First arg is the name of the parent op_region (must already exist) */
arg = op->common.value.arg;
if (!region_node) {
status =
acpi_ns_lookup(walk_state->scope_info,
arg->common.value.name, ACPI_TYPE_REGION,
ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
walk_state, &region_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.name, status);
return_ACPI_STATUS(status);
}
}
/* Second arg is the field flags */
arg = arg->common.next;
info.field_flags = (u8) arg->common.value.integer;
info.attribute = 0;
/* Each remaining arg is a Named Field */
info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
info.region_node = region_node;
status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_init_field_objects
*
* PARAMETERS: Op - Op containing the Field definition and args
* ` walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: For each "Field Unit" name in the argument list that is
* part of the field declaration, enter the name into the
* namespace.
*
******************************************************************************/
acpi_status
acpi_ds_init_field_objects(union acpi_parse_object *op,
struct acpi_walk_state *walk_state)
{
acpi_status status;
union acpi_parse_object *arg = NULL;
struct acpi_namespace_node *node;
u8 type = 0;
ACPI_FUNCTION_TRACE_PTR("ds_init_field_objects", op);
switch (walk_state->opcode) {
case AML_FIELD_OP:
arg = acpi_ps_get_arg(op, 2);
type = ACPI_TYPE_LOCAL_REGION_FIELD;
break;
case AML_BANK_FIELD_OP:
arg = acpi_ps_get_arg(op, 4);
type = ACPI_TYPE_LOCAL_BANK_FIELD;
break;
case AML_INDEX_FIELD_OP:
arg = acpi_ps_get_arg(op, 3);
type = ACPI_TYPE_LOCAL_INDEX_FIELD;
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/*
* Walk the list of entries in the field_list
*/
while (arg) {
/* Ignore OFFSET and ACCESSAS terms here */
if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
status = acpi_ns_lookup(walk_state->scope_info,
(char *)&arg->named.name,
type, ACPI_IMODE_LOAD_PASS1,
ACPI_NS_NO_UPSEARCH |
ACPI_NS_DONT_OPEN_SCOPE |
ACPI_NS_ERROR_IF_FOUND,
walk_state, &node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR((char *)&arg->named.name,
status);
if (status != AE_ALREADY_EXISTS) {
return_ACPI_STATUS(status);
}
/* Name already exists, just ignore this error */
status = AE_OK;
}
arg->common.node = node;
}
/* Move to next field in the list */
arg = arg->common.next;
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_bank_field
*
* PARAMETERS: Op - Op containing the Field definition and args
* region_node - Object for the containing Operation Region
* ` walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Create a new bank field in the specified operation region
*
******************************************************************************/
acpi_status
acpi_ds_create_bank_field(union acpi_parse_object *op,
struct acpi_namespace_node *region_node,
struct acpi_walk_state *walk_state)
{
acpi_status status;
union acpi_parse_object *arg;
struct acpi_create_field_info info;
ACPI_FUNCTION_TRACE_PTR("ds_create_bank_field", op);
/* First arg is the name of the parent op_region (must already exist) */
arg = op->common.value.arg;
if (!region_node) {
status =
acpi_ns_lookup(walk_state->scope_info,
arg->common.value.name, ACPI_TYPE_REGION,
ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
walk_state, &region_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.name, status);
return_ACPI_STATUS(status);
}
}
/* Second arg is the Bank Register (Field) (must already exist) */
arg = arg->common.next;
status =
acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT, walk_state,
&info.register_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.string, status);
return_ACPI_STATUS(status);
}
/* Third arg is the bank_value */
arg = arg->common.next;
info.bank_value = (u32) arg->common.value.integer;
/* Fourth arg is the field flags */
arg = arg->common.next;
info.field_flags = (u8) arg->common.value.integer;
/* Each remaining arg is a Named Field */
info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
info.region_node = region_node;
status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_index_field
*
* PARAMETERS: Op - Op containing the Field definition and args
* region_node - Object for the containing Operation Region
* ` walk_state - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Create a new index field in the specified operation region
*
******************************************************************************/
acpi_status
acpi_ds_create_index_field(union acpi_parse_object *op,
struct acpi_namespace_node *region_node,
struct acpi_walk_state *walk_state)
{
acpi_status status;
union acpi_parse_object *arg;
struct acpi_create_field_info info;
ACPI_FUNCTION_TRACE_PTR("ds_create_index_field", op);
/* First arg is the name of the Index register (must already exist) */
arg = op->common.value.arg;
status =
acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT, walk_state,
&info.register_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.string, status);
return_ACPI_STATUS(status);
}
/* Second arg is the data register (must already exist) */
arg = arg->common.next;
status =
acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT, walk_state,
&info.data_register_node);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_NSERROR(arg->common.value.string, status);
return_ACPI_STATUS(status);
}
/* Next arg is the field flags */
arg = arg->common.next;
info.field_flags = (u8) arg->common.value.integer;
/* Each remaining arg is a Named Field */
info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
info.region_node = region_node;
status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
return_ACPI_STATUS(status);
}
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