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/******************************************************************************
*
* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acdispat.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exprep")
/* Local prototypes */
static u32
acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
u8 field_flags, u32 * return_byte_alignment);
#ifdef ACPI_UNDER_DEVELOPMENT
static u32
acpi_ex_generate_access(u32 field_bit_offset,
u32 field_bit_length, u32 region_length);
/*******************************************************************************
*
* FUNCTION: acpi_ex_generate_access
*
* PARAMETERS: field_bit_offset - Start of field within parent region/buffer
* field_bit_length - Length of field in bits
* region_length - Length of parent in bytes
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* byte_alignment (1, 2, 3, or 4)
*
* DESCRIPTION: Generate an optimal access width for fields defined with the
* any_acc keyword.
*
* NOTE: Need to have the region_length in order to check for boundary
* conditions (end-of-region). However, the region_length is a deferred
* operation. Therefore, to complete this implementation, the generation
* of this access width must be deferred until the region length has
* been evaluated.
*
******************************************************************************/
static u32
acpi_ex_generate_access(u32 field_bit_offset,
u32 field_bit_length, u32 region_length)
{
u32 field_byte_length;
u32 field_byte_offset;
u32 field_byte_end_offset;
u32 access_byte_width;
u32 field_start_offset;
u32 field_end_offset;
u32 minimum_access_width = 0xFFFFFFFF;
u32 minimum_accesses = 0xFFFFFFFF;
u32 accesses;
ACPI_FUNCTION_TRACE(ex_generate_access);
/* Round Field start offset and length to "minimal" byte boundaries */
field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
field_byte_end_offset = ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length +
field_bit_offset, 8));
field_byte_length = field_byte_end_offset - field_byte_offset;
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Bit length %u, Bit offset %u\n",
field_bit_length, field_bit_offset));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Byte Length %u, Byte Offset %u, End Offset %u\n",
field_byte_length, field_byte_offset,
field_byte_end_offset));
/*
* Iterative search for the maximum access width that is both aligned
* and does not go beyond the end of the region
*
* Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
*/
for (access_byte_width = 1; access_byte_width <= 8;
access_byte_width <<= 1) {
/*
* 1) Round end offset up to next access boundary and make sure that
* this does not go beyond the end of the parent region.
* 2) When the Access width is greater than the field_byte_length, we
* are done. (This does not optimize for the perfectly aligned
* case yet).
*/
if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
region_length) {
field_start_offset =
ACPI_ROUND_DOWN(field_byte_offset,
access_byte_width) /
access_byte_width;
field_end_offset =
ACPI_ROUND_UP((field_byte_length +
field_byte_offset),
access_byte_width) /
access_byte_width;
accesses = field_end_offset - field_start_offset;
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"AccessWidth %u end is within region\n",
access_byte_width));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Field Start %u, Field End %u -- requires %u accesses\n",
field_start_offset, field_end_offset,
accesses));
/* Single access is optimal */
if (accesses <= 1) {
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Entire field can be accessed with one operation of size %u\n",
access_byte_width));
return_VALUE(access_byte_width);
}
/*
* Fits in the region, but requires more than one read/write.
* try the next wider access on next iteration
*/
if (accesses < minimum_accesses) {
minimum_accesses = accesses;
minimum_access_width = access_byte_width;
}
} else {
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"AccessWidth %u end is NOT within region\n",
access_byte_width));
if (access_byte_width == 1) {
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Field goes beyond end-of-region!\n"));
/* Field does not fit in the region at all */
return_VALUE(0);
}
/*
* This width goes beyond the end-of-region, back off to
* previous access
*/
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Backing off to previous optimal access width of %u\n",
minimum_access_width));
return_VALUE(minimum_access_width);
}
}
/*
* Could not read/write field with one operation,
* just use max access width
*/
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"Cannot access field in one operation, using width 8\n"));
return_VALUE(8);
}
#endif /* ACPI_UNDER_DEVELOPMENT */
/*******************************************************************************
*
* FUNCTION: acpi_ex_decode_field_access
*
* PARAMETERS: obj_desc - Field object
* field_flags - Encoded fieldflags (contains access bits)
* return_byte_alignment - Where the byte alignment is returned
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* byte_alignment (1, 2, 3, or 4)
*
* DESCRIPTION: Decode the access_type bits of a field definition.
*
******************************************************************************/
static u32
acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
u8 field_flags, u32 * return_byte_alignment)
{
u32 access;
u32 byte_alignment;
u32 bit_length;
ACPI_FUNCTION_TRACE(ex_decode_field_access);
access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
switch (access) {
case AML_FIELD_ACCESS_ANY:
#ifdef ACPI_UNDER_DEVELOPMENT
byte_alignment =
acpi_ex_generate_access(obj_desc->common_field.
start_field_bit_offset,
obj_desc->common_field.bit_length,
0xFFFFFFFF
/* Temp until we pass region_length as parameter */
);
bit_length = byte_alignment * 8;
#endif
byte_alignment = 1;
bit_length = 8;
break;
case AML_FIELD_ACCESS_BYTE:
case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
byte_alignment = 1;
bit_length = 8;
break;
case AML_FIELD_ACCESS_WORD:
byte_alignment = 2;
bit_length = 16;
break;
case AML_FIELD_ACCESS_DWORD:
byte_alignment = 4;
bit_length = 32;
break;
case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
byte_alignment = 8;
bit_length = 64;
break;
default:
/* Invalid field access type */
ACPI_ERROR((AE_INFO, "Unknown field access type 0x%X", access));
return_UINT32(0);
}
if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
/*
* buffer_field access can be on any byte boundary, so the
* byte_alignment is always 1 byte -- regardless of any byte_alignment
* implied by the field access type.
*/
byte_alignment = 1;
}
*return_byte_alignment = byte_alignment;
return_UINT32(bit_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_prep_common_field_object
*
* PARAMETERS: obj_desc - The field object
* field_flags - Access, lock_rule, and update_rule.
* The format of a field_flag is described
* in the ACPI specification
* field_attribute - Special attributes (not used)
* field_bit_position - Field start position
* field_bit_length - Field length in number of bits
*
* RETURN: Status
*
* DESCRIPTION: Initialize the areas of the field object that are common
* to the various types of fields. Note: This is very "sensitive"
* code because we are solving the general case for field
* alignment.
*
******************************************************************************/
acpi_status
acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc,
u8 field_flags,
u8 field_attribute,
u32 field_bit_position, u32 field_bit_length)
{
u32 access_bit_width;
u32 byte_alignment;
u32 nearest_byte_address;
ACPI_FUNCTION_TRACE(ex_prep_common_field_object);
/*
* Note: the structure being initialized is the
* ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
* area are initialized by this procedure.
*/
obj_desc->common_field.field_flags = field_flags;
obj_desc->common_field.attribute = field_attribute;
obj_desc->common_field.bit_length = field_bit_length;
/*
* Decode the access type so we can compute offsets. The access type gives
* two pieces of information - the width of each field access and the
* necessary byte_alignment (address granularity) of the access.
*
* For any_acc, the access_bit_width is the largest width that is both
* necessary and possible in an attempt to access the whole field in one
* I/O operation. However, for any_acc, the byte_alignment is always one
* byte.
*
* For all Buffer Fields, the byte_alignment is always one byte.
*
* For all other acce
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