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Diffstat (limited to 'drivers/acpi/executer/exprep.c')
| -rw-r--r-- | drivers/acpi/executer/exprep.c | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/drivers/acpi/executer/exprep.c b/drivers/acpi/executer/exprep.c new file mode 100644 index 00000000000..264ef3bba31 --- /dev/null +++ b/drivers/acpi/executer/exprep.c @@ -0,0 +1,530 @@ + +/****************************************************************************** + * + * Module Name: exprep - ACPI AML (p-code) execution - field prep utilities + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * 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 <acpi/acinterp.h> +#include <acpi/amlcode.h> +#include <acpi/acnamesp.h> + + +#define _COMPONENT ACPI_EXECUTER + ACPI_MODULE_NAME ("exprep") + + +#ifdef ACPI_UNDER_DEVELOPMENT +/******************************************************************************* + * + * 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 %d, Bit offset %d\n", + field_bit_length, field_bit_offset)); + ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, + "Byte Length %d, Byte Offset %d, End Offset %d\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, + "access_width %d end is within region\n", access_byte_width)); + ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, + "Field Start %d, Field End %d -- requires %d 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 %d\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, + "access_width %d 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")); + return_VALUE (0); /* Field does not fit in the region at all */ + } + + /* 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 %d\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: Access - Encoded field access bits + * Length - Field length. + * + * 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 param */); + 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_DEBUG_PRINT ((ACPI_DB_ERROR, + "Unknown field access type %X\n", + access)); + return_VALUE (0); + } + + if (ACPI_GET_OBJECT_TYPE (obj_desc) == 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_VALUE (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_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 access types (Byte, Word, Dword, Qword), the Bitwidth is + * the same (equivalent) as the byte_alignment. + */ + access_bit_width = acpi_ex_decode_field_access (obj_desc, field_flags, + &byte_alignment); + if (!access_bit_width) { + return_ACPI_STATUS (AE_AML_OPERAND_VALUE); + } + + /* Setup width (access granularity) fields */ + + obj_desc->common_field.access_byte_width = (u8) + ACPI_DIV_8 (access_bit_width); /* 1, 2, 4, 8 */ + + obj_desc->common_field.access_bit_width = (u8) access_bit_width; + + /* + * base_byte_offset is the address of the start of the field within the + * region. It is the byte address of the first *datum* (field-width data + * unit) of the field. (i.e., the first datum that contains at least the + * first *bit* of the field.) + * + * Note: byte_alignment is always either equal to the access_bit_width or 8 + * (Byte access), and it defines the addressing granularity of the parent + * region or buffer. + */ + nearest_byte_address = + ACPI_ROUND_BITS_DOWN_TO_BYTES (field_bit_position); + obj_desc->common_field.base_byte_offset = (u32) + ACPI_ROUND_DOWN (nearest_byte_address, byte_alignment); + + /* + * start_field_bit_offset is the offset of the first bit of the field within + * a field datum. + */ + obj_desc->common_field.start_field_bit_offset = (u8) + (field_bit_position - ACPI_MUL_8 (obj_desc->common_field.base_byte_offset)); + + /* + * Does the entire field fit within a single field access element? (datum) + * (i.e., without crossing a datum boundary) + */ + if ((obj_desc->common_field.start_field_bit_offset + field_bit_length) <= + (u16) access_bit_width) { + obj_desc->common.flags |= AOPOBJ_SINGLE_DATUM; + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_prep_field_value + * + * PARAMETERS: Node - Owning Node + * region_node - Region in which field is being defined + * 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); +} + |