Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
530
drivers/acpi/executer/exprep.c
Normal file
530
drivers/acpi/executer/exprep.c
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@@ -0,0 +1,530 @@
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/******************************************************************************
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*
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* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
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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/acinterp.h>
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#include <acpi/amlcode.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exprep")
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#ifdef ACPI_UNDER_DEVELOPMENT
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_generate_access
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*
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* PARAMETERS: field_bit_offset - Start of field within parent region/buffer
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* field_bit_length - Length of field in bits
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* region_length - Length of parent in bytes
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*
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* RETURN: Field granularity (8, 16, 32 or 64) and
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* byte_alignment (1, 2, 3, or 4)
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*
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* DESCRIPTION: Generate an optimal access width for fields defined with the
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* any_acc keyword.
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*
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* NOTE: Need to have the region_length in order to check for boundary
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* conditions (end-of-region). However, the region_length is a deferred
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* operation. Therefore, to complete this implementation, the generation
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* of this access width must be deferred until the region length has
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* been evaluated.
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*
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******************************************************************************/
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static u32
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acpi_ex_generate_access (
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u32 field_bit_offset,
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u32 field_bit_length,
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u32 region_length)
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{
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u32 field_byte_length;
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u32 field_byte_offset;
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u32 field_byte_end_offset;
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u32 access_byte_width;
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u32 field_start_offset;
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u32 field_end_offset;
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u32 minimum_access_width = 0xFFFFFFFF;
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u32 minimum_accesses = 0xFFFFFFFF;
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u32 accesses;
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ACPI_FUNCTION_TRACE ("ex_generate_access");
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/* Round Field start offset and length to "minimal" byte boundaries */
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field_byte_offset = ACPI_DIV_8 (ACPI_ROUND_DOWN (field_bit_offset, 8));
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field_byte_end_offset = ACPI_DIV_8 (ACPI_ROUND_UP (field_bit_length + field_bit_offset, 8));
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field_byte_length = field_byte_end_offset - field_byte_offset;
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Bit length %d, Bit offset %d\n",
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field_bit_length, field_bit_offset));
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Byte Length %d, Byte Offset %d, End Offset %d\n",
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field_byte_length, field_byte_offset, field_byte_end_offset));
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/*
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* Iterative search for the maximum access width that is both aligned
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* and does not go beyond the end of the region
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*
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* Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
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*/
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for (access_byte_width = 1; access_byte_width <= 8; access_byte_width <<= 1) {
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/*
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* 1) Round end offset up to next access boundary and make sure that this
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* does not go beyond the end of the parent region.
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* 2) When the Access width is greater than the field_byte_length, we are done.
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* (This does not optimize for the perfectly aligned case yet).
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*/
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if (ACPI_ROUND_UP (field_byte_end_offset, access_byte_width) <= region_length) {
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field_start_offset = ACPI_ROUND_DOWN (field_byte_offset, access_byte_width) /
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access_byte_width;
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field_end_offset = ACPI_ROUND_UP ((field_byte_length + field_byte_offset),
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access_byte_width) / access_byte_width;
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accesses = field_end_offset - field_start_offset;
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"access_width %d end is within region\n", access_byte_width));
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Field Start %d, Field End %d -- requires %d accesses\n",
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field_start_offset, field_end_offset, accesses));
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/* Single access is optimal */
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if (accesses <= 1) {
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Entire field can be accessed with one operation of size %d\n",
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access_byte_width));
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return_VALUE (access_byte_width);
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}
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/*
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* Fits in the region, but requires more than one read/write.
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* try the next wider access on next iteration
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*/
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if (accesses < minimum_accesses) {
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minimum_accesses = accesses;
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minimum_access_width = access_byte_width;
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}
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}
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else {
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"access_width %d end is NOT within region\n", access_byte_width));
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if (access_byte_width == 1) {
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Field goes beyond end-of-region!\n"));
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return_VALUE (0); /* Field does not fit in the region at all */
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}
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/* This width goes beyond the end-of-region, back off to previous access */
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Backing off to previous optimal access width of %d\n",
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minimum_access_width));
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return_VALUE (minimum_access_width);
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}
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}
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/* Could not read/write field with one operation, just use max access width */
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ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
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"Cannot access field in one operation, using width 8\n"));
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return_VALUE (8);
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}
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#endif /* ACPI_UNDER_DEVELOPMENT */
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_decode_field_access
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*
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* PARAMETERS: Access - Encoded field access bits
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* Length - Field length.
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*
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* RETURN: Field granularity (8, 16, 32 or 64) and
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* byte_alignment (1, 2, 3, or 4)
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*
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* DESCRIPTION: Decode the access_type bits of a field definition.
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*
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******************************************************************************/
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static u32
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acpi_ex_decode_field_access (
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union acpi_operand_object *obj_desc,
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u8 field_flags,
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u32 *return_byte_alignment)
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{
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u32 access;
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u32 byte_alignment;
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u32 bit_length;
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ACPI_FUNCTION_TRACE ("ex_decode_field_access");
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access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
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switch (access) {
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case AML_FIELD_ACCESS_ANY:
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#ifdef ACPI_UNDER_DEVELOPMENT
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byte_alignment = acpi_ex_generate_access (obj_desc->common_field.start_field_bit_offset,
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obj_desc->common_field.bit_length,
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0xFFFFFFFF /* Temp until we pass region_length as param */);
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bit_length = byte_alignment * 8;
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#endif
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byte_alignment = 1;
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bit_length = 8;
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break;
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case AML_FIELD_ACCESS_BYTE:
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case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
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byte_alignment = 1;
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bit_length = 8;
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break;
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case AML_FIELD_ACCESS_WORD:
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byte_alignment = 2;
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bit_length = 16;
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break;
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case AML_FIELD_ACCESS_DWORD:
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byte_alignment = 4;
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bit_length = 32;
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break;
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case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
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byte_alignment = 8;
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bit_length = 64;
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break;
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default:
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/* Invalid field access type */
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Unknown field access type %X\n",
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access));
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return_VALUE (0);
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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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* buffer_field access can be on any byte boundary, so the
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* byte_alignment is always 1 byte -- regardless of any byte_alignment
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* implied by the field access type.
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*/
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byte_alignment = 1;
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}
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*return_byte_alignment = byte_alignment;
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return_VALUE (bit_length);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_prep_common_field_object
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*
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* PARAMETERS: obj_desc - The field object
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* field_flags - Access, lock_rule, and update_rule.
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* The format of a field_flag is described
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* in the ACPI specification
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* field_bit_position - Field start position
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* field_bit_length - Field length in number of bits
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize the areas of the field object that are common
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* to the various types of fields. Note: This is very "sensitive"
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* code because we are solving the general case for field
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* alignment.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_prep_common_field_object (
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union acpi_operand_object *obj_desc,
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u8 field_flags,
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u8 field_attribute,
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u32 field_bit_position,
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u32 field_bit_length)
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{
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u32 access_bit_width;
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u32 byte_alignment;
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u32 nearest_byte_address;
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ACPI_FUNCTION_TRACE ("ex_prep_common_field_object");
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/*
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* Note: the structure being initialized is the
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* ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
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* area are initialized by this procedure.
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*/
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obj_desc->common_field.field_flags = field_flags;
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obj_desc->common_field.attribute = field_attribute;
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obj_desc->common_field.bit_length = field_bit_length;
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/*
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* Decode the access type so we can compute offsets. The access type gives
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* two pieces of information - the width of each field access and the
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* necessary byte_alignment (address granularity) of the access.
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*
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* For any_acc, the access_bit_width is the largest width that is both
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* necessary and possible in an attempt to access the whole field in one
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* I/O operation. However, for any_acc, the byte_alignment is always one
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* byte.
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*
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* For all Buffer Fields, the byte_alignment is always one byte.
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*
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* For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
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* the same (equivalent) as the byte_alignment.
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*/
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access_bit_width = acpi_ex_decode_field_access (obj_desc, field_flags,
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&byte_alignment);
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if (!access_bit_width) {
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return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
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}
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/* Setup width (access granularity) fields */
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obj_desc->common_field.access_byte_width = (u8)
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ACPI_DIV_8 (access_bit_width); /* 1, 2, 4, 8 */
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obj_desc->common_field.access_bit_width = (u8) access_bit_width;
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/*
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* base_byte_offset is the address of the start of the field within the
|
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* region. It is the byte address of the first *datum* (field-width data
|
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* unit) of the field. (i.e., the first datum that contains at least the
|
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* first *bit* of the field.)
|
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*
|
||||
* Note: byte_alignment is always either equal to the access_bit_width or 8
|
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* (Byte access), and it defines the addressing granularity of the parent
|
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* region or buffer.
|
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*/
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nearest_byte_address =
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ACPI_ROUND_BITS_DOWN_TO_BYTES (field_bit_position);
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obj_desc->common_field.base_byte_offset = (u32)
|
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ACPI_ROUND_DOWN (nearest_byte_address, byte_alignment);
|
||||
|
||||
/*
|
||||
* start_field_bit_offset is the offset of the first bit of the field within
|
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* a field datum.
|
||||
*/
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obj_desc->common_field.start_field_bit_offset = (u8)
|
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(field_bit_position - ACPI_MUL_8 (obj_desc->common_field.base_byte_offset));
|
||||
|
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/*
|
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* Does the entire field fit within a single field access element? (datum)
|
||||
* (i.e., without crossing a datum boundary)
|
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*/
|
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if ((obj_desc->common_field.start_field_bit_offset + field_bit_length) <=
|
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(u16) access_bit_width) {
|
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obj_desc->common.flags |= AOPOBJ_SINGLE_DATUM;
|
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}
|
||||
|
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return_ACPI_STATUS (AE_OK);
|
||||
}
|
||||
|
||||
|
||||
/*******************************************************************************
|
||||
*
|
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* FUNCTION: acpi_ex_prep_field_value
|
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*
|
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* PARAMETERS: Node - Owning Node
|
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* region_node - Region in which field is being defined
|
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* field_flags - Access, lock_rule, and update_rule.
|
||||
* field_bit_position - Field start position
|
||||
* field_bit_length - Field length in number of bits
|
||||
*
|
||||
* RETURN: Status
|
||||
*
|
||||
* DESCRIPTION: Construct an union acpi_operand_object of type def_field and
|
||||
* connect it to the parent Node.
|
||||
*
|
||||
******************************************************************************/
|
||||
|
||||
acpi_status
|
||||
acpi_ex_prep_field_value (
|
||||
struct acpi_create_field_info *info)
|
||||
{
|
||||
union acpi_operand_object *obj_desc;
|
||||
u32 type;
|
||||
acpi_status status;
|
||||
|
||||
|
||||
ACPI_FUNCTION_TRACE ("ex_prep_field_value");
|
||||
|
||||
|
||||
/* Parameter validation */
|
||||
|
||||
if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) {
|
||||
if (!info->region_node) {
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null region_node\n"));
|
||||
return_ACPI_STATUS (AE_AML_NO_OPERAND);
|
||||
}
|
||||
|
||||
type = acpi_ns_get_type (info->region_node);
|
||||
if (type != ACPI_TYPE_REGION) {
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
|
||||
"Needed Region, found type %X (%s)\n",
|
||||
type, acpi_ut_get_type_name (type)));
|
||||
|
||||
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
|
||||
}
|
||||
}
|
||||
|
||||
/* Allocate a new field object */
|
||||
|
||||
obj_desc = acpi_ut_create_internal_object (info->field_type);
|
||||
if (!obj_desc) {
|
||||
return_ACPI_STATUS (AE_NO_MEMORY);
|
||||
}
|
||||
|
||||
/* Initialize areas of the object that are common to all fields */
|
||||
|
||||
obj_desc->common_field.node = info->field_node;
|
||||
status = acpi_ex_prep_common_field_object (obj_desc, info->field_flags,
|
||||
info->attribute, info->field_bit_position, info->field_bit_length);
|
||||
if (ACPI_FAILURE (status)) {
|
||||
acpi_ut_delete_object_desc (obj_desc);
|
||||
return_ACPI_STATUS (status);
|
||||
}
|
||||
|
||||
/* Initialize areas of the object that are specific to the field type */
|
||||
|
||||
switch (info->field_type) {
|
||||
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
||||
|
||||
obj_desc->field.region_obj = acpi_ns_get_attached_object (info->region_node);
|
||||
|
||||
/* An additional reference for the container */
|
||||
|
||||
acpi_ut_add_reference (obj_desc->field.region_obj);
|
||||
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
||||
"region_field: bit_off %X, Off %X, Gran %X, Region %p\n",
|
||||
obj_desc->field.start_field_bit_offset, obj_desc->field.base_byte_offset,
|
||||
obj_desc->field.access_byte_width, obj_desc->field.region_obj));
|
||||
break;
|
||||
|
||||
|
||||
case ACPI_TYPE_LOCAL_BANK_FIELD:
|
||||
|
||||
obj_desc->bank_field.value = info->bank_value;
|
||||
obj_desc->bank_field.region_obj = acpi_ns_get_attached_object (info->region_node);
|
||||
obj_desc->bank_field.bank_obj = acpi_ns_get_attached_object (info->register_node);
|
||||
|
||||
/* An additional reference for the attached objects */
|
||||
|
||||
acpi_ut_add_reference (obj_desc->bank_field.region_obj);
|
||||
acpi_ut_add_reference (obj_desc->bank_field.bank_obj);
|
||||
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
||||
"Bank Field: bit_off %X, Off %X, Gran %X, Region %p, bank_reg %p\n",
|
||||
obj_desc->bank_field.start_field_bit_offset,
|
||||
obj_desc->bank_field.base_byte_offset,
|
||||
obj_desc->field.access_byte_width,
|
||||
obj_desc->bank_field.region_obj,
|
||||
obj_desc->bank_field.bank_obj));
|
||||
break;
|
||||
|
||||
|
||||
case ACPI_TYPE_LOCAL_INDEX_FIELD:
|
||||
|
||||
obj_desc->index_field.index_obj = acpi_ns_get_attached_object (info->register_node);
|
||||
obj_desc->index_field.data_obj = acpi_ns_get_attached_object (info->data_register_node);
|
||||
obj_desc->index_field.value = (u32)
|
||||
(info->field_bit_position / ACPI_MUL_8 (obj_desc->field.access_byte_width));
|
||||
|
||||
if (!obj_desc->index_field.data_obj || !obj_desc->index_field.index_obj) {
|
||||
ACPI_REPORT_ERROR (("Null Index Object during field prep\n"));
|
||||
acpi_ut_delete_object_desc (obj_desc);
|
||||
return_ACPI_STATUS (AE_AML_INTERNAL);
|
||||
}
|
||||
|
||||
/* An additional reference for the attached objects */
|
||||
|
||||
acpi_ut_add_reference (obj_desc->index_field.data_obj);
|
||||
acpi_ut_add_reference (obj_desc->index_field.index_obj);
|
||||
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
|
||||
"index_field: bit_off %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
|
||||
obj_desc->index_field.start_field_bit_offset,
|
||||
obj_desc->index_field.base_byte_offset,
|
||||
obj_desc->index_field.value,
|
||||
obj_desc->field.access_byte_width,
|
||||
obj_desc->index_field.index_obj,
|
||||
obj_desc->index_field.data_obj));
|
||||
break;
|
||||
|
||||
default:
|
||||
/* No other types should get here */
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Store the constructed descriptor (obj_desc) into the parent Node,
|
||||
* preserving the current type of that named_obj.
|
||||
*/
|
||||
status = acpi_ns_attach_object (info->field_node, obj_desc,
|
||||
acpi_ns_get_type (info->field_node));
|
||||
|
||||
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set named_obj %p [%4.4s], obj_desc %p\n",
|
||||
info->field_node, acpi_ut_get_node_name (info->field_node), obj_desc));
|
||||
|
||||
/* Remove local reference to the object */
|
||||
|
||||
acpi_ut_remove_reference (obj_desc);
|
||||
return_ACPI_STATUS (status);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user