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https://mirrors.bfsu.edu.cn/git/linux.git
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7cb7f45c7f
This reverts commit f9ca058430.
which caused a regression:
http://bugzilla.kernel.org/show_bug.cgi?id=13620
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
964 lines
28 KiB
C
964 lines
28 KiB
C
/******************************************************************************
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*
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* Module Name: exfldio - Aml Field I/O
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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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 "accommon.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#include "acevents.h"
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#include "acdispat.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exfldio")
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/* Local prototypes */
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static acpi_status
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acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
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u32 field_datum_byte_offset,
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acpi_integer * value, u32 read_write);
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static u8
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acpi_ex_register_overflow(union acpi_operand_object *obj_desc,
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acpi_integer value);
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static acpi_status
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acpi_ex_setup_region(union acpi_operand_object *obj_desc,
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u32 field_datum_byte_offset);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_setup_region
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*
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* PARAMETERS: obj_desc - Field to be read or written
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* field_datum_byte_offset - Byte offset of this datum within the
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* parent field
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common processing for acpi_ex_extract_from_field and
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* acpi_ex_insert_into_field. Initialize the Region if necessary and
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* validate the request.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_setup_region(union acpi_operand_object *obj_desc,
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u32 field_datum_byte_offset)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *rgn_desc;
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ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset);
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rgn_desc = obj_desc->common_field.region_obj;
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/* We must have a valid region */
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if (rgn_desc->common.type != ACPI_TYPE_REGION) {
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ACPI_ERROR((AE_INFO, "Needed Region, found type %X (%s)",
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rgn_desc->common.type,
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acpi_ut_get_object_type_name(rgn_desc)));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* If the Region Address and Length 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 (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_region_arguments(rgn_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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/* Exit if Address/Length have been disallowed by the host OS */
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if (rgn_desc->common.flags & AOPOBJ_INVALID) {
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return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
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}
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/*
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* Exit now for SMBus address space, it has a non-linear address space
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* and the request cannot be directly validated
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*/
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if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
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/* SMBus has a non-linear address space */
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return_ACPI_STATUS(AE_OK);
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}
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#ifdef ACPI_UNDER_DEVELOPMENT
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/*
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* If the Field access is any_acc, we can now compute the optimal
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* access (because we know know the length of the parent region)
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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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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#endif
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/*
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* Validate the request. The entire request from the byte offset for a
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* length of one field datum (access width) must fit within the region.
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* (Region length is specified in bytes)
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*/
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if (rgn_desc->region.length <
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(obj_desc->common_field.base_byte_offset +
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field_datum_byte_offset +
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obj_desc->common_field.access_byte_width)) {
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if (acpi_gbl_enable_interpreter_slack) {
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/*
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* Slack mode only: We will go ahead and allow access to this
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* field if it is within the region length rounded up to the next
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* access width boundary. acpi_size cast for 64-bit compile.
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*/
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if (ACPI_ROUND_UP(rgn_desc->region.length,
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obj_desc->common_field.
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access_byte_width) >=
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((acpi_size) obj_desc->common_field.
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base_byte_offset +
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obj_desc->common_field.access_byte_width +
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field_datum_byte_offset)) {
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return_ACPI_STATUS(AE_OK);
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}
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}
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if (rgn_desc->region.length <
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obj_desc->common_field.access_byte_width) {
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/*
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* This is the case where the access_type (acc_word, etc.) is wider
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* than the region itself. For example, a region of length one
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* byte, and a field with Dword access specified.
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*/
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ACPI_ERROR((AE_INFO,
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"Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)",
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acpi_ut_get_node_name(obj_desc->
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common_field.node),
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obj_desc->common_field.access_byte_width,
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acpi_ut_get_node_name(rgn_desc->region.
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node),
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rgn_desc->region.length));
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}
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/*
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* Offset rounded up to next multiple of field width
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* exceeds region length, indicate an error
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*/
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ACPI_ERROR((AE_INFO,
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"Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)",
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acpi_ut_get_node_name(obj_desc->common_field.node),
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obj_desc->common_field.base_byte_offset,
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field_datum_byte_offset,
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obj_desc->common_field.access_byte_width,
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acpi_ut_get_node_name(rgn_desc->region.node),
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rgn_desc->region.length));
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return_ACPI_STATUS(AE_AML_REGION_LIMIT);
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_access_region
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*
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* PARAMETERS: obj_desc - Field to be read
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* field_datum_byte_offset - Byte offset of this datum within the
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* parent field
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* Value - Where to store value (must at least
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* the size of acpi_integer)
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* Function - Read or Write flag plus other region-
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* dependent flags
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read or Write a single field datum to an Operation Region.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_access_region(union acpi_operand_object *obj_desc,
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u32 field_datum_byte_offset,
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acpi_integer * value, u32 function)
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{
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acpi_status status;
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union acpi_operand_object *rgn_desc;
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u32 region_offset;
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ACPI_FUNCTION_TRACE(ex_access_region);
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/*
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* Ensure that the region operands are fully evaluated and verify
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* the validity of the request
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*/
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status = acpi_ex_setup_region(obj_desc, field_datum_byte_offset);
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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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* The physical address of this field datum is:
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*
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* 1) The base of the region, plus
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* 2) The base offset of the field, plus
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* 3) The current offset into the field
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*/
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rgn_desc = obj_desc->common_field.region_obj;
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region_offset =
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obj_desc->common_field.base_byte_offset + field_datum_byte_offset;
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if ((function & ACPI_IO_MASK) == ACPI_READ) {
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[READ]"));
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[WRITE]"));
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}
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD,
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" Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n",
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acpi_ut_get_region_name(rgn_desc->region.
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space_id),
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rgn_desc->region.space_id,
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obj_desc->common_field.access_byte_width,
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obj_desc->common_field.base_byte_offset,
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field_datum_byte_offset, ACPI_CAST_PTR(void,
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(rgn_desc->
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region.
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address +
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region_offset))));
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/* Invoke the appropriate address_space/op_region handler */
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status =
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acpi_ev_address_space_dispatch(rgn_desc, function, region_offset,
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ACPI_MUL_8(obj_desc->common_field.
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access_byte_width),
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value);
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if (ACPI_FAILURE(status)) {
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if (status == AE_NOT_IMPLEMENTED) {
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ACPI_ERROR((AE_INFO,
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"Region %s(%X) not implemented",
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acpi_ut_get_region_name(rgn_desc->region.
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space_id),
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rgn_desc->region.space_id));
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} else if (status == AE_NOT_EXIST) {
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ACPI_ERROR((AE_INFO,
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"Region %s(%X) has no handler",
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acpi_ut_get_region_name(rgn_desc->region.
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space_id),
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rgn_desc->region.space_id));
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}
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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_register_overflow
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*
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* PARAMETERS: obj_desc - Register(Field) to be written
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* Value - Value to be stored
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*
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* RETURN: TRUE if value overflows the field, FALSE otherwise
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*
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* DESCRIPTION: Check if a value is out of range of the field being written.
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* Used to check if the values written to Index and Bank registers
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* are out of range. Normally, the value is simply truncated
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* to fit the field, but this case is most likely a serious
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* coding error in the ASL.
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*
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******************************************************************************/
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static u8
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acpi_ex_register_overflow(union acpi_operand_object *obj_desc,
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acpi_integer value)
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{
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if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) {
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/*
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* The field is large enough to hold the maximum integer, so we can
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* never overflow it.
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*/
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return (FALSE);
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}
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if (value >= ((acpi_integer) 1 << obj_desc->common_field.bit_length)) {
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/*
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* The Value is larger than the maximum value that can fit into
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* the register.
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*/
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return (TRUE);
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}
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/* The Value will fit into the field with no truncation */
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_field_datum_io
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*
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* PARAMETERS: obj_desc - Field to be read
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* field_datum_byte_offset - Byte offset of this datum within the
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* parent field
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* Value - Where to store value (must be 64 bits)
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* read_write - Read or Write flag
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read or Write a single datum of a field. The field_type is
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* demultiplexed here to handle the different types of fields
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* (buffer_field, region_field, index_field, bank_field)
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
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u32 field_datum_byte_offset,
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acpi_integer * value, u32 read_write)
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{
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acpi_status status;
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acpi_integer local_value;
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ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset);
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if (read_write == ACPI_READ) {
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if (!value) {
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local_value = 0;
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/* To support reads without saving return value */
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value = &local_value;
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}
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/* Clear the entire return buffer first, [Very Important!] */
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*value = 0;
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}
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/*
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* The four types of fields are:
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*
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* buffer_field - Read/write from/to a Buffer
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* region_field - Read/write from/to a Operation Region.
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* bank_field - Write to a Bank Register, then read/write from/to an
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* operation_region
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* index_field - Write to an Index Register, then read/write from/to a
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* Data Register
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*/
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switch (obj_desc->common.type) {
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case 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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if (read_write == ACPI_READ) {
|
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/*
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* Copy the data from the source buffer.
|
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* Length is the field width in bytes.
|
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*/
|
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ACPI_MEMCPY(value,
|
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(obj_desc->buffer_field.buffer_obj)->buffer.
|
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pointer +
|
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obj_desc->buffer_field.base_byte_offset +
|
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field_datum_byte_offset,
|
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obj_desc->common_field.access_byte_width);
|
|
} else {
|
|
/*
|
|
* Copy the data to the target buffer.
|
|
* Length is the field width in bytes.
|
|
*/
|
|
ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer.
|
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pointer +
|
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obj_desc->buffer_field.base_byte_offset +
|
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field_datum_byte_offset, value,
|
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obj_desc->common_field.access_byte_width);
|
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}
|
|
|
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status = AE_OK;
|
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break;
|
|
|
|
case ACPI_TYPE_LOCAL_BANK_FIELD:
|
|
|
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/*
|
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* Ensure that the bank_value is not beyond the capacity of
|
|
* the register
|
|
*/
|
|
if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj,
|
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(acpi_integer) obj_desc->
|
|
bank_field.value)) {
|
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return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
|
|
}
|
|
|
|
/*
|
|
* For bank_fields, we must write the bank_value to the bank_register
|
|
* (itself a region_field) before we can access the data.
|
|
*/
|
|
status =
|
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acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj,
|
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&obj_desc->bank_field.value,
|
|
sizeof(obj_desc->bank_field.
|
|
value));
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Now that the Bank has been selected, fall through to the
|
|
* region_field case and write the datum to the Operation Region
|
|
*/
|
|
|
|
/*lint -fallthrough */
|
|
|
|
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
|
/*
|
|
* For simple region_fields, we just directly access the owning
|
|
* Operation Region.
|
|
*/
|
|
status =
|
|
acpi_ex_access_region(obj_desc, field_datum_byte_offset,
|
|
value, read_write);
|
|
break;
|
|
|
|
case ACPI_TYPE_LOCAL_INDEX_FIELD:
|
|
|
|
/*
|
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* Ensure that the index_value is not beyond the capacity of
|
|
* the register
|
|
*/
|
|
if (acpi_ex_register_overflow(obj_desc->index_field.index_obj,
|
|
(acpi_integer) obj_desc->
|
|
index_field.value)) {
|
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return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
|
|
}
|
|
|
|
/* Write the index value to the index_register (itself a region_field) */
|
|
|
|
field_datum_byte_offset += obj_desc->index_field.value;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Write to Index Register: Value %8.8X\n",
|
|
field_datum_byte_offset));
|
|
|
|
status =
|
|
acpi_ex_insert_into_field(obj_desc->index_field.index_obj,
|
|
&field_datum_byte_offset,
|
|
sizeof(field_datum_byte_offset));
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
if (read_write == ACPI_READ) {
|
|
|
|
/* Read the datum from the data_register */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Read from Data Register\n"));
|
|
|
|
status =
|
|
acpi_ex_extract_from_field(obj_desc->index_field.
|
|
data_obj, value,
|
|
sizeof(acpi_integer));
|
|
} else {
|
|
/* Write the datum to the data_register */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Write to Data Register: Value %8.8X%8.8X\n",
|
|
ACPI_FORMAT_UINT64(*value)));
|
|
|
|
status =
|
|
acpi_ex_insert_into_field(obj_desc->index_field.
|
|
data_obj, value,
|
|
sizeof(acpi_integer));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %X",
|
|
obj_desc->common.type));
|
|
status = AE_AML_INTERNAL;
|
|
break;
|
|
}
|
|
|
|
if (ACPI_SUCCESS(status)) {
|
|
if (read_write == ACPI_READ) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Value Read %8.8X%8.8X, Width %d\n",
|
|
ACPI_FORMAT_UINT64(*value),
|
|
obj_desc->common_field.
|
|
access_byte_width));
|
|
} else {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Value Written %8.8X%8.8X, Width %d\n",
|
|
ACPI_FORMAT_UINT64(*value),
|
|
obj_desc->common_field.
|
|
access_byte_width));
|
|
}
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_write_with_update_rule
|
|
*
|
|
* PARAMETERS: obj_desc - Field to be written
|
|
* Mask - bitmask within field datum
|
|
* field_value - Value to write
|
|
* field_datum_byte_offset - Offset of datum within field
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Apply the field update rule to a field write
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc,
|
|
acpi_integer mask,
|
|
acpi_integer field_value,
|
|
u32 field_datum_byte_offset)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
acpi_integer merged_value;
|
|
acpi_integer current_value;
|
|
|
|
ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask);
|
|
|
|
/* Start with the new bits */
|
|
|
|
merged_value = field_value;
|
|
|
|
/* If the mask is all ones, we don't need to worry about the update rule */
|
|
|
|
if (mask != ACPI_INTEGER_MAX) {
|
|
|
|
/* Decode the update rule */
|
|
|
|
switch (obj_desc->common_field.
|
|
field_flags & AML_FIELD_UPDATE_RULE_MASK) {
|
|
case AML_FIELD_UPDATE_PRESERVE:
|
|
/*
|
|
* Check if update rule needs to be applied (not if mask is all
|
|
* ones) The left shift drops the bits we want to ignore.
|
|
*/
|
|
if ((~mask << (ACPI_MUL_8(sizeof(mask)) -
|
|
ACPI_MUL_8(obj_desc->common_field.
|
|
access_byte_width))) != 0) {
|
|
/*
|
|
* Read the current contents of the byte/word/dword containing
|
|
* the field, and merge with the new field value.
|
|
*/
|
|
status =
|
|
acpi_ex_field_datum_io(obj_desc,
|
|
field_datum_byte_offset,
|
|
¤t_value,
|
|
ACPI_READ);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
merged_value |= (current_value & ~mask);
|
|
}
|
|
break;
|
|
|
|
case AML_FIELD_UPDATE_WRITE_AS_ONES:
|
|
|
|
/* Set positions outside the field to all ones */
|
|
|
|
merged_value |= ~mask;
|
|
break;
|
|
|
|
case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
|
|
|
|
/* Set positions outside the field to all zeros */
|
|
|
|
merged_value &= mask;
|
|
break;
|
|
|
|
default:
|
|
|
|
ACPI_ERROR((AE_INFO,
|
|
"Unknown UpdateRule value: %X",
|
|
(obj_desc->common_field.
|
|
field_flags &
|
|
AML_FIELD_UPDATE_RULE_MASK)));
|
|
return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
|
|
}
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
|
|
"Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
|
|
ACPI_FORMAT_UINT64(mask),
|
|
field_datum_byte_offset,
|
|
obj_desc->common_field.access_byte_width,
|
|
ACPI_FORMAT_UINT64(field_value),
|
|
ACPI_FORMAT_UINT64(merged_value)));
|
|
|
|
/* Write the merged value */
|
|
|
|
status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset,
|
|
&merged_value, ACPI_WRITE);
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_extract_from_field
|
|
*
|
|
* PARAMETERS: obj_desc - Field to be read
|
|
* Buffer - Where to store the field data
|
|
* buffer_length - Length of Buffer
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Retrieve the current value of the given field
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_extract_from_field(union acpi_operand_object *obj_desc,
|
|
void *buffer, u32 buffer_length)
|
|
{
|
|
acpi_status status;
|
|
acpi_integer raw_datum;
|
|
acpi_integer merged_datum;
|
|
u32 field_offset = 0;
|
|
u32 buffer_offset = 0;
|
|
u32 buffer_tail_bits;
|
|
u32 datum_count;
|
|
u32 field_datum_count;
|
|
u32 i;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_extract_from_field);
|
|
|
|
/* Validate target buffer and clear it */
|
|
|
|
if (buffer_length <
|
|
ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Field size %X (bits) is too large for buffer (%X)",
|
|
obj_desc->common_field.bit_length, buffer_length));
|
|
|
|
return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
|
|
}
|
|
ACPI_MEMSET(buffer, 0, buffer_length);
|
|
|
|
/* Compute the number of datums (access width data items) */
|
|
|
|
datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
|
|
obj_desc->common_field.access_bit_width);
|
|
field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
|
|
obj_desc->common_field.
|
|
start_field_bit_offset,
|
|
obj_desc->common_field.
|
|
access_bit_width);
|
|
|
|
/* Priming read from the field */
|
|
|
|
status =
|
|
acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum,
|
|
ACPI_READ);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
merged_datum =
|
|
raw_datum >> obj_desc->common_field.start_field_bit_offset;
|
|
|
|
/* Read the rest of the field */
|
|
|
|
for (i = 1; i < field_datum_count; i++) {
|
|
|
|
/* Get next input datum from the field */
|
|
|
|
field_offset += obj_desc->common_field.access_byte_width;
|
|
status = acpi_ex_field_datum_io(obj_desc, field_offset,
|
|
&raw_datum, ACPI_READ);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Merge with previous datum if necessary.
|
|
*
|
|
* Note: Before the shift, check if the shift value will be larger than
|
|
* the integer size. If so, there is no need to perform the operation.
|
|
* This avoids the differences in behavior between different compilers
|
|
* concerning shift values larger than the target data width.
|
|
*/
|
|
if ((obj_desc->common_field.access_bit_width -
|
|
obj_desc->common_field.start_field_bit_offset) <
|
|
ACPI_INTEGER_BIT_SIZE) {
|
|
merged_datum |=
|
|
raw_datum << (obj_desc->common_field.
|
|
access_bit_width -
|
|
obj_desc->common_field.
|
|
start_field_bit_offset);
|
|
}
|
|
|
|
if (i == datum_count) {
|
|
break;
|
|
}
|
|
|
|
/* Write merged datum to target buffer */
|
|
|
|
ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
|
|
ACPI_MIN(obj_desc->common_field.access_byte_width,
|
|
buffer_length - buffer_offset));
|
|
|
|
buffer_offset += obj_desc->common_field.access_byte_width;
|
|
merged_datum =
|
|
raw_datum >> obj_desc->common_field.start_field_bit_offset;
|
|
}
|
|
|
|
/* Mask off any extra bits in the last datum */
|
|
|
|
buffer_tail_bits = obj_desc->common_field.bit_length %
|
|
obj_desc->common_field.access_bit_width;
|
|
if (buffer_tail_bits) {
|
|
merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
|
|
}
|
|
|
|
/* Write the last datum to the buffer */
|
|
|
|
ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
|
|
ACPI_MIN(obj_desc->common_field.access_byte_width,
|
|
buffer_length - buffer_offset));
|
|
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_insert_into_field
|
|
*
|
|
* PARAMETERS: obj_desc - Field to be written
|
|
* Buffer - Data to be written
|
|
* buffer_length - Length of Buffer
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Store the Buffer contents into the given field
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
|
|
void *buffer, u32 buffer_length)
|
|
{
|
|
acpi_status status;
|
|
acpi_integer mask;
|
|
acpi_integer width_mask;
|
|
acpi_integer merged_datum;
|
|
acpi_integer raw_datum = 0;
|
|
u32 field_offset = 0;
|
|
u32 buffer_offset = 0;
|
|
u32 buffer_tail_bits;
|
|
u32 datum_count;
|
|
u32 field_datum_count;
|
|
u32 i;
|
|
u32 required_length;
|
|
void *new_buffer;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_insert_into_field);
|
|
|
|
/* Validate input buffer */
|
|
|
|
new_buffer = NULL;
|
|
required_length =
|
|
ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (buffer_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, buffer_length);
|
|
buffer = new_buffer;
|
|
buffer_length = required_length;
|
|
}
|
|
|
|
/*
|
|
* Create the bitmasks used for bit insertion.
|
|
* Note: This if/else is used to bypass compiler differences with the
|
|
* shift operator
|
|
*/
|
|
if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
|
|
width_mask = ACPI_INTEGER_MAX;
|
|
} else {
|
|
width_mask =
|
|
ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
|
|
access_bit_width);
|
|
}
|
|
|
|
mask = width_mask &
|
|
ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
|
|
|
|
/* Compute the number of datums (access width data items) */
|
|
|
|
datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
|
|
obj_desc->common_field.access_bit_width);
|
|
|
|
field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
|
|
obj_desc->common_field.
|
|
start_field_bit_offset,
|
|
obj_desc->common_field.
|
|
access_bit_width);
|
|
|
|
/* Get initial Datum from the input buffer */
|
|
|
|
ACPI_MEMCPY(&raw_datum, buffer,
|
|
ACPI_MIN(obj_desc->common_field.access_byte_width,
|
|
buffer_length - buffer_offset));
|
|
|
|
merged_datum =
|
|
raw_datum << obj_desc->common_field.start_field_bit_offset;
|
|
|
|
/* Write the entire field */
|
|
|
|
for (i = 1; i < field_datum_count; i++) {
|
|
|
|
/* Write merged datum to the target field */
|
|
|
|
merged_datum &= mask;
|
|
status = acpi_ex_write_with_update_rule(obj_desc, mask,
|
|
merged_datum,
|
|
field_offset);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto exit;
|
|
}
|
|
|
|
field_offset += obj_desc->common_field.access_byte_width;
|
|
|
|
/*
|
|
* Start new output datum by merging with previous input datum
|
|
* if necessary.
|
|
*
|
|
* Note: Before the shift, check if the shift value will be larger than
|
|
* the integer size. If so, there is no need to perform the operation.
|
|
* This avoids the differences in behavior between different compilers
|
|
* concerning shift values larger than the target data width.
|
|
*/
|
|
if ((obj_desc->common_field.access_bit_width -
|
|
obj_desc->common_field.start_field_bit_offset) <
|
|
ACPI_INTEGER_BIT_SIZE) {
|
|
merged_datum =
|
|
raw_datum >> (obj_desc->common_field.
|
|
access_bit_width -
|
|
obj_desc->common_field.
|
|
start_field_bit_offset);
|
|
} else {
|
|
merged_datum = 0;
|
|
}
|
|
|
|
mask = width_mask;
|
|
|
|
if (i == datum_count) {
|
|
break;
|
|
}
|
|
|
|
/* Get the next input datum from the buffer */
|
|
|
|
buffer_offset += obj_desc->common_field.access_byte_width;
|
|
ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset,
|
|
ACPI_MIN(obj_desc->common_field.access_byte_width,
|
|
buffer_length - buffer_offset));
|
|
merged_datum |=
|
|
raw_datum << obj_desc->common_field.start_field_bit_offset;
|
|
}
|
|
|
|
/* Mask off any extra bits in the last datum */
|
|
|
|
buffer_tail_bits = (obj_desc->common_field.bit_length +
|
|
obj_desc->common_field.start_field_bit_offset) %
|
|
obj_desc->common_field.access_bit_width;
|
|
if (buffer_tail_bits) {
|
|
mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
|
|
}
|
|
|
|
/* Write the last datum to the field */
|
|
|
|
merged_datum &= mask;
|
|
status = acpi_ex_write_with_update_rule(obj_desc,
|
|
mask, merged_datum,
|
|
field_offset);
|
|
|
|
exit:
|
|
/* Free temporary buffer if we used one */
|
|
|
|
if (new_buffer) {
|
|
ACPI_FREE(new_buffer);
|
|
}
|
|
return_ACPI_STATUS(status);
|
|
}
|