diff options
Diffstat (limited to 'drivers/acpi/executer/exprep.c')
| -rw-r--r-- | drivers/acpi/executer/exprep.c | 104 |
1 files changed, 69 insertions, 35 deletions
diff --git a/drivers/acpi/executer/exprep.c b/drivers/acpi/executer/exprep.c index 264ef3bba31b..c9e3c68b5549 100644 --- a/drivers/acpi/executer/exprep.c +++ b/drivers/acpi/executer/exprep.c @@ -52,8 +52,23 @@ #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 @@ -99,12 +114,14 @@ acpi_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_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)); @@ -117,20 +134,26 @@ acpi_ex_generate_access ( */ 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). + * 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; + 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)); @@ -139,8 +162,8 @@ acpi_ex_generate_access ( if (accesses <= 1) { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, - "Entire field can be accessed with one operation of size %d\n", - access_byte_width)); + "Entire field can be accessed with one operation of size %d\n", + access_byte_width)); return_VALUE (access_byte_width); } @@ -155,15 +178,20 @@ acpi_ex_generate_access ( } else { ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, - "access_width %d end is NOT within region\n", access_byte_width)); + "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 */ + /* 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 %d\n", minimum_access_width)); @@ -171,8 +199,10 @@ acpi_ex_generate_access ( } } - /* Could not read/write field with one operation, just use max 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); @@ -184,8 +214,9 @@ acpi_ex_generate_access ( * * FUNCTION: acpi_ex_decode_field_access * - * PARAMETERS: Access - Encoded field access bits - * Length - Field length. + * 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) @@ -214,9 +245,10 @@ acpi_ex_decode_field_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 */); + 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 @@ -276,6 +308,7 @@ acpi_ex_decode_field_access ( * 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 * @@ -337,7 +370,7 @@ acpi_ex_prep_common_field_object ( /* Setup width (access granularity) fields */ obj_desc->common_field.access_byte_width = (u8) - ACPI_DIV_8 (access_bit_width); /* 1, 2, 4, 8 */ + ACPI_DIV_8 (access_bit_width); /* 1, 2, 4, 8 */ obj_desc->common_field.access_bit_width = (u8) access_bit_width; @@ -380,11 +413,7 @@ acpi_ex_prep_common_field_object ( * * 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 + * PARAMETERS: Info - Contains all field creation info * * RETURN: Status * @@ -445,7 +474,7 @@ acpi_ex_prep_field_value ( switch (info->field_type) { case ACPI_TYPE_LOCAL_REGION_FIELD: - obj_desc->field.region_obj = acpi_ns_get_attached_object (info->region_node); + obj_desc->field.region_obj = acpi_ns_get_attached_object (info->region_node); /* An additional reference for the container */ @@ -461,8 +490,10 @@ acpi_ex_prep_field_value ( 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); + 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 */ @@ -481,10 +512,13 @@ acpi_ex_prep_field_value ( 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.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)); + (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")); 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