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alistair23-linux/drivers/acpi/dispatcher/dsfield.c
Bob Moore b229cf92ee ACPI: ACPICA 20060421 
Removed a device initialization optimization introduced in
20051216 where the _STA method was not run unless an _INI
was also present for the same device. This optimization
could cause problems because it could allow _INI methods
to be run within a not-present device subtree (If a
not-present device had no _INI, _STA would not be run,
the not-present status would not be discovered, and the
children of the device would be incorrectly traversed.)

Implemented a new _STA optimization where namespace
subtrees that do not contain _INI are identified and
ignored during device initialization. Selectively running
_STA can significantly improve boot time on large machines
(with assistance from Len Brown.)

Implemented support for the device initialization case
where the returned _STA flags indicate a device not-present
but functioning. In this case, _INI is not run, but the
device children are examined for presence, as per the
ACPI specification.

Implemented an additional change to the IndexField support
in order to conform to MS behavior. The value written to
the Index Register is not simply a byte offset, it is a
byte offset in units of the access width of the parent
Index Field. (Fiodor Suietov)

Defined and deployed a new OSL interface,
acpi_os_validate_address().  This interface is called during
the creation of all AML operation regions, and allows
the host OS to exert control over what addresses it will
allow the AML code to access. Operation Regions whose
addresses are disallowed will cause a runtime exception
when they are actually accessed (will not affect or abort
table loading.)

Defined and deployed a new OSL interface,
acpi_os_validate_interface().  This interface allows the host OS
to match the various "optional" interface/behavior strings
for the _OSI predefined control method as appropriate
(with assistance from Bjorn Helgaas.)

Restructured and corrected various problems in the
exception handling code paths within DsCallControlMethod
and DsTerminateControlMethod in dsmethod (with assistance
from Takayoshi Kochi.)

Modified the Linux source converter to ignore quoted string
literals while converting identifiers from mixed to lower
case. This will correct problems with the disassembler
and other areas where such strings must not be modified.

The ACPI_FUNCTION_* macros no longer require quotes around
the function name. This allows the Linux source converter
to convert the names, now that the converter ignores
quoted strings.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-14 02:30:55 -04:00

600 lines
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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_ERROR_NAMESPACE(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_ERROR((AE_INFO,
"Bit offset within field too large (> 0xFFFFFFFF)"));
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_ERROR_NAMESPACE((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_ERROR((AE_INFO,
"Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
ACPI_CAST_PTR(char,
&info->field_node->
name)));
return_ACPI_STATUS(AE_SUPPORT);
}
info->field_bit_position += info->field_bit_length;
break;
default:
ACPI_ERROR((AE_INFO,
"Invalid opcode in field list: %X",
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_ERROR_NAMESPACE(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_ERROR_NAMESPACE((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_ERROR_NAMESPACE(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_ERROR_NAMESPACE(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_ERROR_NAMESPACE(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_ERROR_NAMESPACE(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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