377 lines
12 KiB
C
377 lines
12 KiB
C
/******************************************************************************
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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 - 2005, 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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* 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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"field_read [TO]: Obj %p, Type %X, Buf %p, byte_len %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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"field_read [FROM]: bit_len %X, bit_off %X, byte_off %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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/* Lock entire transaction if requested */
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locked =
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Read from the field */
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status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
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acpi_ex_release_global_lock(locked);
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exit:
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if (ACPI_FAILURE(status)) {
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acpi_ut_remove_reference(buffer_desc);
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} else {
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*ret_buffer_desc = buffer_desc;
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_write_data_to_field
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*
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* PARAMETERS: source_desc - Contains data to write
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* obj_desc - The named field
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* result_desc - Where the return value is returned, if any
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to a named field
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*
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******************************************************************************/
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acpi_status
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acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc)
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{
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acpi_status status;
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u32 length;
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u32 required_length;
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void *buffer;
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void *new_buffer;
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u8 locked;
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union acpi_operand_object *buffer_desc;
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ACPI_FUNCTION_TRACE_PTR("ex_write_data_to_field", obj_desc);
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/* Parameter validation */
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if (!source_desc || !obj_desc) {
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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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 write. We will bypass the entire field mechanism
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* and handoff the buffer directly to the handler.
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*
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* Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
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*/
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if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
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ACPI_REPORT_ERROR(("SMBus write requires Buffer, found type %s\n", acpi_ut_get_object_type_name(source_desc)));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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if (source_desc->buffer.length < ACPI_SMBUS_BUFFER_SIZE) {
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ACPI_REPORT_ERROR(("SMBus write requires Buffer of length %X, found length %X\n", ACPI_SMBUS_BUFFER_SIZE, source_desc->buffer.length));
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return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
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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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buffer = buffer_desc->buffer.pointer;
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ACPI_MEMCPY(buffer, source_desc->buffer.pointer,
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ACPI_SMBUS_BUFFER_SIZE);
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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 write (returns status and perhaps data in the
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* same buffer)
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* Note: SMBus protocol type 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_integer *) buffer,
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ACPI_WRITE | (obj_desc->field.
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attribute << 16));
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acpi_ex_release_global_lock(locked);
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*result_desc = buffer_desc;
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return_ACPI_STATUS(status);
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}
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/* Get a pointer to the data to be written */
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switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
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case ACPI_TYPE_INTEGER:
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buffer = &source_desc->integer.value;
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length = sizeof(source_desc->integer.value);
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break;
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case ACPI_TYPE_BUFFER:
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buffer = source_desc->buffer.pointer;
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length = source_desc->buffer.length;
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break;
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case ACPI_TYPE_STRING:
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buffer = source_desc->string.pointer;
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length = source_desc->string.length;
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break;
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default:
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* We must have a buffer that is at least as long as the field
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* we are writing to. This is because individual fields are
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* indivisible and partial writes are not supported -- as per
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* the ACPI specification.
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*/
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new_buffer = NULL;
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required_length =
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ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
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if (length < required_length) {
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/* We need to create a new buffer */
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new_buffer = ACPI_MEM_CALLOCATE(required_length);
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if (!new_buffer) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/*
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* Copy the original data to the new buffer, starting
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* at Byte zero. All unused (upper) bytes of the
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* buffer will be 0.
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*/
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ACPI_MEMCPY((char *)new_buffer, (char *)buffer, length);
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buffer = new_buffer;
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length = required_length;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"field_write [FROM]: Obj %p (%s:%X), Buf %p, byte_len %X\n",
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source_desc,
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acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE
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(source_desc)),
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ACPI_GET_OBJECT_TYPE(source_desc), buffer, length));
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"field_write [TO]: Obj %p (%s:%X), bit_len %X, bit_off %X, byte_off %X\n",
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obj_desc,
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acpi_ut_get_type_name(ACPI_GET_OBJECT_TYPE(obj_desc)),
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ACPI_GET_OBJECT_TYPE(obj_desc),
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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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/* Lock entire transaction if requested */
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locked =
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Write to the field */
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status = acpi_ex_insert_into_field(obj_desc, buffer, length);
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acpi_ex_release_global_lock(locked);
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/* Free temporary buffer if we used one */
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if (new_buffer) {
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ACPI_MEM_FREE(new_buffer);
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}
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return_ACPI_STATUS(status);
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}
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