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marcus.erl |
/******************************************************************************
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*
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* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acdispat.h>
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#include <acpi/acinterp.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exfield")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_read_data_from_field
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*
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* PARAMETERS: walk_state - Current execution state
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* obj_desc - The named field
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* ret_buffer_desc - Where the return data object is stored
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from a named field. Returns either an Integer or a
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| 62 |
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* Buffer, depending on the size of the field.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **ret_buffer_desc)
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{
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acpi_status status;
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union acpi_operand_object *buffer_desc;
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acpi_size length;
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void *buffer;
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u8 locked;
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ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
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/* Parameter validation */
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if (!obj_desc) {
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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if (!ret_buffer_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_BUFFER_FIELD) {
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/*
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* If the buffer_field arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_buffer_field_arguments(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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} else
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if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD)
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&& (obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_SMBUS)) {
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/*
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* This is an SMBus read. We must create a buffer to hold the data
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* and directly access the region handler.
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*/
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buffer_desc =
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acpi_ut_create_buffer_object(ACPI_SMBUS_BUFFER_SIZE);
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if (!buffer_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Lock entire transaction if requested */
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locked =
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acpi_ex_acquire_global_lock(obj_desc->common_field.
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field_flags);
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/*
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* Perform the read.
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* Note: Smbus protocol value is passed in upper 16-bits of Function
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*/
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status = acpi_ex_access_region(obj_desc, 0,
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ACPI_CAST_PTR(acpi_integer,
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buffer_desc->
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buffer.pointer),
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ACPI_READ | (obj_desc->field.
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attribute << 16));
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acpi_ex_release_global_lock(locked);
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goto exit;
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}
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/*
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* Allocate a buffer for the contents of the field.
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*
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* If the field is larger than the size of an acpi_integer, create
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* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
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* the use of arithmetic operators on the returned value if the
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* field size is equal or smaller than an Integer.
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*
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* Note: Field.length is in bits.
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*/
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length =
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(acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
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if (length > acpi_gbl_integer_byte_width) {
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/* Field is too large for an Integer, create a Buffer instead */
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buffer_desc = acpi_ut_create_buffer_object(length);
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if (!buffer_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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buffer = buffer_desc->buffer.pointer;
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} else {
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/* Field will fit within an Integer (normal case) */
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buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
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if (!buffer_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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length = acpi_gbl_integer_byte_width;
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buffer_desc->integer.value = 0;
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buffer = &buffer_desc->integer.value;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
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obj_desc, ACPI_GET_OBJECT_TYPE(obj_desc), buffer,
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(u32) length));
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
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obj_desc->common_field.bit_length,
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obj_desc->common_field.start_field_bit_offset,
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obj_desc->common_field.base_byte_offset));
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| 176 |
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/* Lock entire transaction if requested */
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| 177 |
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| 178 |
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locked =
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| 179 |
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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| 181 |
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/* Read from the field */
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| 182 |
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| 183 |
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status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
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| 184 |
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acpi_ex_release_global_lock(locked);
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| 185 |
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| 186 |
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exit:
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| 187 |
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if (ACPI_FAILURE(status)) {
|
| 188 |
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acpi_ut_remove_reference(buffer_desc);
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| 189 |
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} else {
|
| 190 |
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*ret_buffer_desc = buffer_desc;
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| 191 |
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}
|
| 192 |
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|
| 193 |
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return_ACPI_STATUS(status);
|
| 194 |
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}
|
| 195 |
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|
| 196 |
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/*******************************************************************************
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| 197 |
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*
|
| 198 |
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* FUNCTION: acpi_ex_write_data_to_field
|
| 199 |
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*
|
| 200 |
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* PARAMETERS: source_desc - Contains data to write
|
| 201 |
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* obj_desc - The named field
|
| 202 |
|
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* result_desc - Where the return value is returned, if any
|
| 203 |
|
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*
|
| 204 |
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* RETURN: Status
|
| 205 |
|
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*
|
| 206 |
|
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* DESCRIPTION: Write to a named field
|
| 207 |
|
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*
|
| 208 |
|
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******************************************************************************/
|
| 209 |
|
|
|
| 210 |
|
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acpi_status
|
| 211 |
|
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acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
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| 212 |
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union acpi_operand_object *obj_desc,
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| 213 |
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union acpi_operand_object **result_desc)
|
| 214 |
|
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{
|
| 215 |
|
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acpi_status status;
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| 216 |
|
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u32 length;
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| 217 |
|
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u32 required_length;
|
| 218 |
|
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void *buffer;
|
| 219 |
|
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void *new_buffer;
|
| 220 |
|
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u8 locked;
|
| 221 |
|
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union acpi_operand_object *buffer_desc;
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| 222 |
|
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|
| 223 |
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ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
|
| 224 |
|
|
|
| 225 |
|
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/* Parameter validation */
|
| 226 |
|
|
|
| 227 |
|
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if (!source_desc || !obj_desc) {
|
| 228 |
|
|
return_ACPI_STATUS(AE_AML_NO_OPERAND);
|
| 229 |
|
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}
|
| 230 |
|
|
|
| 231 |
|
|
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_BUFFER_FIELD) {
|
| 232 |
|
|
/*
|
| 233 |
|
|
* If the buffer_field arguments have not been previously evaluated,
|
| 234 |
|
|
* evaluate them now and save the results.
|
| 235 |
|
|
*/
|
| 236 |
|
|
if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
|
| 237 |
|
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status = acpi_ds_get_buffer_field_arguments(obj_desc);
|
| 238 |
|
|
if (ACPI_FAILURE(status)) {
|
| 239 |
|
|
return_ACPI_STATUS(status);
|
| 240 |
|
|
}
|
| 241 |
|
|
}
|
| 242 |
|
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} else
|
| 243 |
|
|
if ((ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD)
|
| 244 |
|
|
&& (obj_desc->field.region_obj->region.space_id ==
|
| 245 |
|
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ACPI_ADR_SPACE_SMBUS)) {
|
| 246 |
|
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/*
|
| 247 |
|
|
* This is an SMBus write. We will bypass the entire field mechanism
|
| 248 |
|
|
* and handoff the buffer directly to the handler.
|
| 249 |
|
|
*
|
| 250 |
|
|
* Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
|
| 251 |
|
|
*/
|
| 252 |
|
|
if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
|
| 253 |
|
|
ACPI_ERROR((AE_INFO,
|
| 254 |
|
|
"SMBus write requires Buffer, found type %s",
|
| 255 |
|
|
acpi_ut_get_object_type_name(source_desc)));
|
| 256 |
|
|
|
| 257 |
|
|
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
|
| 258 |
|
|
}
|
| 259 |
|
|
|
| 260 |
|
|
if (source_desc->buffer.length < ACPI_SMBUS_BUFFER_SIZE) {
|
| 261 |
|
|
ACPI_ERROR((AE_INFO,
|
| 262 |
|
|
"SMBus write requires Buffer of length %X, found length %X",
|
| 263 |
|
|
ACPI_SMBUS_BUFFER_SIZE,
|
| 264 |
|
|
source_desc->buffer.length));
|
| 265 |
|
|
|
| 266 |
|
|
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
|
| 267 |
|
|
}
|
| 268 |
|
|
|
| 269 |
|
|
buffer_desc =
|
| 270 |
|
|
acpi_ut_create_buffer_object(ACPI_SMBUS_BUFFER_SIZE);
|
| 271 |
|
|
if (!buffer_desc) {
|
| 272 |
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
| 273 |
|
|
}
|
| 274 |
|
|
|
| 275 |
|
|
buffer = buffer_desc->buffer.pointer;
|
| 276 |
|
|
ACPI_MEMCPY(buffer, source_desc->buffer.pointer,
|
| 277 |
|
|
ACPI_SMBUS_BUFFER_SIZE);
|
| 278 |
|
|
|
| 279 |
|
|
/* Lock entire transaction if requested */
|
| 280 |
|
|
|
| 281 |
|
|
locked =
|
| 282 |
|
|
acpi_ex_acquire_global_lock(obj_desc->common_field.
|
| 283 |
|
|
field_flags);
|
| 284 |
|
|
|
| 285 |
|
|
/*
|
| 286 |
|
|
* Perform the write (returns status and perhaps data in the
|
| 287 |
|
|
* same buffer)
|
| 288 |
|
|
* Note: SMBus protocol type is passed in upper 16-bits of Function.
|
| 289 |
|
|
*/
|
| 290 |
|
|
status = acpi_ex_access_region(obj_desc, 0,
|
| 291 |
|
|
(acpi_integer *) buffer,
|
| 292 |
|
|
ACPI_WRITE | (obj_desc->field.
|
| 293 |
|
|
attribute << 16));
|
| 294 |
|
|
acpi_ex_release_global_lock(locked);
|
| 295 |
|
|
|
| 296 |
|
|
*result_desc = buffer_desc;
|
| 297 |
|
|
return_ACPI_STATUS(status);
|
| 298 |
|
|
}
|
| 299 |
|
|
|
| 300 |
|
|
/* Get a pointer to the data to be written */
|
| 301 |
|
|
|
| 302 |
|
|
switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
|
| 303 |
|
|
case ACPI_TYPE_INTEGER:
|
| 304 |
|
|
buffer = &source_desc->integer.value;
|
| 305 |
|
|
length = sizeof(source_desc->integer.value);
|
| 306 |
|
|
break;
|
| 307 |
|
|
|
| 308 |
|
|
case ACPI_TYPE_BUFFER:
|
| 309 |
|
|
buffer = source_desc->buffer.pointer;
|
| 310 |
|
|
length = source_desc->buffer.length;
|
| 311 |
|
|
break;
|
| 312 |
|
|
|
| 313 |
|
|
case ACPI_TYPE_STRING:
|
| 314 |
|
|
buffer = source_desc->string.pointer;
|
| 315 |
|
|
length = source_desc->string.length;
|
| 316 |
|
|
break;
|
| 317 |
|
|
|
| 318 |
|
|
default:
|
| 319 |
|
|
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
|
| 320 |
|
|
}
|
| 321 |
|
|
|
| 322 |
|
|
/*
|
| 323 |
|
|
* We must have a buffer that is at least as long as the field
|
| 324 |
|
|
* we are writing to. This is because individual fields are
|
| 325 |
|
|
* indivisible and partial writes are not supported -- as per
|
| 326 |
|
|
* the ACPI specification.
|
| 327 |
|
|
*/
|
| 328 |
|
|
new_buffer = NULL;
|
| 329 |
|
|
required_length =
|
| 330 |
|
|
ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
|
| 331 |
|
|
|
| 332 |
|
|
if (length < required_length) {
|
| 333 |
|
|
|
| 334 |
|
|
/* We need to create a new buffer */
|
| 335 |
|
|
|
| 336 |
|
|
new_buffer = ACPI_ALLOCATE_ZEROED(required_length);
|
| 337 |
|
|
if (!new_buffer) {
|
| 338 |
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
| 339 |
|
|
}
|
| 340 |
|
|
|
| 341 |
|
|
/*
|
| 342 |
|
|
* Copy the original data to the new buffer, starting
|
| 343 |
|
|
* at Byte zero. All unused (upper) bytes of the
|
| 344 |
|
|
* buffer will be 0.
|
| 345 |
|
|
*/
|
| 346 |
|
|
ACPI_MEMCPY((char *)new_buffer, (char *)buffer, length);
|
| 347 |
|
|
buffer = new_buffer;
|
| 348 |
|
|
length = required_length;
|
| 349 |
|
|
}
|
| 350 |
|
|
|
| 351 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
| 352 |
|
|
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
|
| 353 |
|
|
source_desc,
|
| 354 |
|
|
acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE
|
| 355 |
|
|
(source_desc)),
|
| 356 |
|
|
ACPI_GET_OBJECT_TYPE(source_desc), buffer, length));
|
| 357 |
|
|
|
| 358 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
| 359 |
|
|
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
|
| 360 |
|
|
obj_desc,
|
| 361 |
|
|
acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE(obj_desc)),
|
| 362 |
|
|
ACPI_GET_OBJECT_TYPE(obj_desc),
|
| 363 |
|
|
obj_desc->common_field.bit_length,
|
| 364 |
|
|
obj_desc->common_field.start_field_bit_offset,
|
| 365 |
|
|
obj_desc->common_field.base_byte_offset));
|
| 366 |
|
|
|
| 367 |
|
|
/* Lock entire transaction if requested */
|
| 368 |
|
|
|
| 369 |
|
|
locked =
|
| 370 |
|
|
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
|
| 371 |
|
|
|
| 372 |
|
|
/* Write to the field */
|
| 373 |
|
|
|
| 374 |
|
|
status = acpi_ex_insert_into_field(obj_desc, buffer, length);
|
| 375 |
|
|
acpi_ex_release_global_lock(locked);
|
| 376 |
|
|
|
| 377 |
|
|
/* Free temporary buffer if we used one */
|
| 378 |
|
|
|
| 379 |
|
|
if (new_buffer) {
|
| 380 |
|
|
ACPI_FREE(new_buffer);
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
return_ACPI_STATUS(status);
|
| 384 |
|
|
}
|
