linux/drivers/acpi/executer/exfield.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

385 lines
12 KiB
C

/******************************************************************************
*
* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
*
*****************************************************************************/
/*
* 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/acdispat.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")
/*******************************************************************************
*
* FUNCTION: acpi_ex_read_data_from_field
*
* PARAMETERS: walk_state - Current execution state
* obj_desc - The named field
* ret_buffer_desc - Where the return data object is stored
*
* RETURN: Status
*
* DESCRIPTION: Read from a named field. Returns either an Integer or a
* Buffer, depending on the size of the field.
*
******************************************************************************/
acpi_status
acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
union acpi_operand_object *obj_desc,
union acpi_operand_object **ret_buffer_desc)
{
acpi_status status;
union acpi_operand_object *buffer_desc;
acpi_size length;
void *buffer;
u8 locked;
ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
/* Parameter validation */
if (!obj_desc) {
return_ACPI_STATUS(AE_AML_NO_OPERAND);
}
if (!ret_buffer_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_BUFFER_FIELD) {
/*
* If the buffer_field arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
status = acpi_ds_get_buffer_field_arguments(obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
} else
if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD)
&& (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_SMBUS)) {
/*
* This is an SMBus read. We must create a buffer to hold the data
* and directly access the region handler.
*/
buffer_desc =
acpi_ut_create_buffer_object(ACPI_SMBUS_BUFFER_SIZE);
if (!buffer_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Lock entire transaction if requested */
locked =
acpi_ex_acquire_global_lock(obj_desc->common_field.
field_flags);
/*
* Perform the read.
* Note: Smbus protocol value is passed in upper 16-bits of Function
*/
status = acpi_ex_access_region(obj_desc, 0,
ACPI_CAST_PTR(acpi_integer,
buffer_desc->
buffer.pointer),
ACPI_READ | (obj_desc->field.
attribute << 16));
acpi_ex_release_global_lock(locked);
goto exit;
}
/*
* Allocate a buffer for the contents of the field.
*
* If the field is larger than the size of an acpi_integer, create
* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
* the use of arithmetic operators on the returned value if the
* field size is equal or smaller than an Integer.
*
* Note: Field.length is in bits.
*/
length =
(acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
if (length > acpi_gbl_integer_byte_width) {
/* Field is too large for an Integer, create a Buffer instead */
buffer_desc = acpi_ut_create_buffer_object(length);
if (!buffer_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
buffer = buffer_desc->buffer.pointer;
} else {
/* Field will fit within an Integer (normal case) */
buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!buffer_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
length = acpi_gbl_integer_byte_width;
buffer_desc->integer.value = 0;
buffer = &buffer_desc->integer.value;
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
obj_desc, ACPI_GET_OBJECT_TYPE(obj_desc), buffer,
(u32) length));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
obj_desc->common_field.bit_length,
obj_desc->common_field.start_field_bit_offset,
obj_desc->common_field.base_byte_offset));
/* Lock entire transaction if requested */
locked =
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Read from the field */
status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
acpi_ex_release_global_lock(locked);
exit:
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(buffer_desc);
} else {
*ret_buffer_desc = buffer_desc;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_write_data_to_field
*
* PARAMETERS: source_desc - Contains data to write
* obj_desc - The named field
* result_desc - Where the return value is returned, if any
*
* RETURN: Status
*
* DESCRIPTION: Write to a named field
*
******************************************************************************/
acpi_status
acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
union acpi_operand_object *obj_desc,
union acpi_operand_object **result_desc)
{
acpi_status status;
u32 length;
u32 required_length;
void *buffer;
void *new_buffer;
u8 locked;
union acpi_operand_object *buffer_desc;
ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
/* Parameter validation */
if (!source_desc || !obj_desc) {
return_ACPI_STATUS(AE_AML_NO_OPERAND);
}
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_BUFFER_FIELD) {
/*
* If the buffer_field arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
status = acpi_ds_get_buffer_field_arguments(obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
} else
if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD)
&& (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_SMBUS)) {
/*
* This is an SMBus write. We will bypass the entire field mechanism
* and handoff the buffer directly to the handler.
*
* Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
*/
if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
ACPI_ERROR((AE_INFO,
"SMBus write requires Buffer, found type %s",
acpi_ut_get_object_type_name(source_desc)));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
if (source_desc->buffer.length < ACPI_SMBUS_BUFFER_SIZE) {
ACPI_ERROR((AE_INFO,
"SMBus write requires Buffer of length %X, found length %X",
ACPI_SMBUS_BUFFER_SIZE,
source_desc->buffer.length));
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
}
buffer_desc =
acpi_ut_create_buffer_object(ACPI_SMBUS_BUFFER_SIZE);
if (!buffer_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
buffer = buffer_desc->buffer.pointer;
ACPI_MEMCPY(buffer, source_desc->buffer.pointer,
ACPI_SMBUS_BUFFER_SIZE);
/* Lock entire transaction if requested */
locked =
acpi_ex_acquire_global_lock(obj_desc->common_field.
field_flags);
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
* Note: SMBus protocol type is passed in upper 16-bits of Function.
*/
status = acpi_ex_access_region(obj_desc, 0,
(acpi_integer *) buffer,
ACPI_WRITE | (obj_desc->field.
attribute << 16));
acpi_ex_release_global_lock(locked);
*result_desc = buffer_desc;
return_ACPI_STATUS(status);
}
/* Get a pointer to the data to be written */
switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
case ACPI_TYPE_INTEGER:
buffer = &source_desc->integer.value;
length = sizeof(source_desc->integer.value);
break;
case ACPI_TYPE_BUFFER:
buffer = source_desc->buffer.pointer;
length = source_desc->buffer.length;
break;
case ACPI_TYPE_STRING:
buffer = source_desc->string.pointer;
length = source_desc->string.length;
break;
default:
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/*
* We must have a buffer that is at least as long as the field
* we are writing to. This is because individual fields are
* indivisible and partial writes are not supported -- as per
* the ACPI specification.
*/
new_buffer = NULL;
required_length =
ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
if (length < required_length) {
/* We need to create a new buffer */
new_buffer = ACPI_ALLOCATE_ZEROED(required_length);
if (!new_buffer) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/*
* Copy the original data to the new buffer, starting
* at Byte zero. All unused (upper) bytes of the
* buffer will be 0.
*/
ACPI_MEMCPY((char *)new_buffer, (char *)buffer, length);
buffer = new_buffer;
length = required_length;
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
source_desc,
acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE
(source_desc)),
ACPI_GET_OBJECT_TYPE(source_desc), buffer, length));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
obj_desc,
acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE(obj_desc)),
ACPI_GET_OBJECT_TYPE(obj_desc),
obj_desc->common_field.bit_length,
obj_desc->common_field.start_field_bit_offset,
obj_desc->common_field.base_byte_offset));
/* Lock entire transaction if requested */
locked =
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Write to the field */
status = acpi_ex_insert_into_field(obj_desc, buffer, length);
acpi_ex_release_global_lock(locked);
/* Free temporary buffer if we used one */
if (new_buffer) {
ACPI_FREE(new_buffer);
}
return_ACPI_STATUS(status);
}