You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
384 lines
12 KiB
384 lines
12 KiB
/******************************************************************************
|
|
*
|
|
* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2007, 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);
|
|
}
|
|
|