dsopcode.c

h内核

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_init_buffer_field
 *
 * PARAMETERS:  aml_opcode      - create_xxx_field
 *              obj_desc        - buffer_field object
 *              buffer_desc     - Host Buffer
 *              offset_desc     - Offset into buffer
 *              Length          - Length of field (CREATE_FIELD_OP only)
 *              Result          - Where to store the result
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform actual initialization of a buffer field
 *
 ****************************************************************************/

acpi_status
acpi_ds_init_buffer_field (
	u16                             aml_opcode,
	union acpi_operand_object       *obj_desc,
	union acpi_operand_object       *buffer_desc,
	union acpi_operand_object       *offset_desc,
	union acpi_operand_object       *length_desc,
	union acpi_operand_object       *result_desc)
{
	u32                             offset;
	u32                             bit_offset;
	u32                             bit_count;
	u8                              field_flags;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE_PTR ("ds_init_buffer_field", obj_desc);


	/* Host object must be a Buffer */

	if (ACPI_GET_OBJECT_TYPE (buffer_desc) != ACPI_TYPE_BUFFER) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Target of Create Field is not a Buffer object - %s\n",
			acpi_ut_get_object_type_name (buffer_desc)));

		status = AE_AML_OPERAND_TYPE;
		goto cleanup;
	}

	/*
	 * The last parameter to all of these opcodes (result_desc) started
	 * out as a name_string, and should therefore now be a NS node
	 * after resolution in acpi_ex_resolve_operands().
	 */
	if (ACPI_GET_DESCRIPTOR_TYPE (result_desc) != ACPI_DESC_TYPE_NAMED) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) destination not a NS Node [%s]\n",
				acpi_ps_get_opcode_name (aml_opcode), acpi_ut_get_descriptor_name (result_desc)));

		status = AE_AML_OPERAND_TYPE;
		goto cleanup;
	}

	offset = (u32) offset_desc->integer.value;

	/*
	 * Setup the Bit offsets and counts, according to the opcode
	 */
	switch (aml_opcode) {
	case AML_CREATE_FIELD_OP:

		/* Offset is in bits, count is in bits */

		bit_offset = offset;
		bit_count  = (u32) length_desc->integer.value;
		field_flags = AML_FIELD_ACCESS_BYTE;
		break;

	case AML_CREATE_BIT_FIELD_OP:

		/* Offset is in bits, Field is one bit */

		bit_offset = offset;
		bit_count  = 1;
		field_flags = AML_FIELD_ACCESS_BYTE;
		break;

	case AML_CREATE_BYTE_FIELD_OP:

		/* Offset is in bytes, field is one byte */

		bit_offset = 8 * offset;
		bit_count  = 8;
		field_flags = AML_FIELD_ACCESS_BYTE;
		break;

	case AML_CREATE_WORD_FIELD_OP:

		/* Offset is in bytes, field is one word */

		bit_offset = 8 * offset;
		bit_count  = 16;
		field_flags = AML_FIELD_ACCESS_WORD;
		break;

	case AML_CREATE_DWORD_FIELD_OP:

		/* Offset is in bytes, field is one dword */

		bit_offset = 8 * offset;
		bit_count  = 32;
		field_flags = AML_FIELD_ACCESS_DWORD;
		break;

	case AML_CREATE_QWORD_FIELD_OP:

		/* Offset is in bytes, field is one qword */

		bit_offset = 8 * offset;
		bit_count  = 64;
		field_flags = AML_FIELD_ACCESS_QWORD;
		break;

	default:

		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Unknown field creation opcode %02x\n",
			aml_opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

	/* Entire field must fit within the current length of the buffer */

	if ((bit_offset + bit_count) >
		(8 * (u32) buffer_desc->buffer.length)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Field [%4.4s] size %d exceeds Buffer [%4.4s] size %d (bits)\n",
			 acpi_ut_get_node_name (result_desc),
			 bit_offset + bit_count,
			 acpi_ut_get_node_name (buffer_desc->buffer.node),
			 8 * (u32) buffer_desc->buffer.length));
		status = AE_AML_BUFFER_LIMIT;
		goto cleanup;
	}

	/*
	 * Initialize areas of the field object that are common to all fields
	 * For field_flags, use LOCK_RULE = 0 (NO_LOCK), UPDATE_RULE = 0 (UPDATE_PRESERVE)
	 */
	status = acpi_ex_prep_common_field_object (obj_desc, field_flags, 0,
			  bit_offset, bit_count);
	if (ACPI_FAILURE (status)) {
		goto cleanup;
	}

	obj_desc->buffer_field.buffer_obj = buffer_desc;

	/* Reference count for buffer_desc inherits obj_desc count */

	buffer_desc->common.reference_count = (u16) (buffer_desc->common.reference_count +
			  obj_desc->common.reference_count);


cleanup:

	/* Always delete the operands */

	acpi_ut_remove_reference (offset_desc);
	acpi_ut_remove_reference (buffer_desc);

	if (aml_opcode == AML_CREATE_FIELD_OP) {
		acpi_ut_remove_reference (length_desc);
	}

	/* On failure, delete the result descriptor */

	if (ACPI_FAILURE (status)) {
		acpi_ut_remove_reference (result_desc); /* Result descriptor */
	}
	else {
		/* Now the address and length are valid for this buffer_field */

		obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
	}

	return_ACPI_STATUS (status);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid buffer_field Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get buffer_field Buffer and Index
 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 *
 ****************************************************************************/

acpi_status
acpi_ds_eval_buffer_field_operands (
	struct acpi_walk_state          *walk_state,
	union acpi_parse_object         *op)
{
	acpi_status                     status;
	union acpi_operand_object       *obj_desc;
	struct acpi_namespace_node      *node;
	union acpi_parse_object         *next_op;


	ACPI_FUNCTION_TRACE_PTR ("ds_eval_buffer_field_operands", op);


	/*
	 * This is where we evaluate the address and length fields of the
	 * create_xxx_field declaration
	 */
	node =  op->common.node;

	/* next_op points to the op that holds the Buffer */

	next_op = op->common.value.arg;

	/* Evaluate/create the address and length operands */

	status = acpi_ds_create_operands (walk_state, next_op);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc) {
		return_ACPI_STATUS (AE_NOT_EXIST);
	}

	/* Resolve the operands */

	status = acpi_ex_resolve_operands (op->common.aml_opcode,
			  ACPI_WALK_OPERANDS, walk_state);

	ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
			  acpi_ps_get_opcode_name (op->common.aml_opcode),
			  walk_state->num_operands, "after acpi_ex_resolve_operands");

	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) bad operand(s) (%X)\n",
			acpi_ps_get_opcode_name (op->common.aml_opcode), status));

		return_ACPI_STATUS (status);
	}

	/* Initialize the Buffer Field */

	if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
		/* NOTE: Slightly different operands for this opcode */

		status = acpi_ds_init_buffer_field (op->common.aml_opcode, obj_desc,
				 walk_state->operands[0], walk_state->operands[1],
				 walk_state->operands[2], walk_state->operands[3]);
	}
	else {
		/* All other, create_xxx_field opcodes */

		status = acpi_ds_init_buffer_field (op->common.aml_opcode, obj_desc,
				 walk_state->operands[0], walk_state->operands[1],
						  NULL, walk_state->operands[2]);
	}

	return_ACPI_STATUS (status);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_region_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid region Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get region address and length
 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 *
 ****************************************************************************/

acpi_status
acpi_ds_eval_region_operands (
	struct acpi_walk_state          *walk_state,
	union acpi_parse_object         *op)
{
	acpi_status                     status;
	union acpi_operand_object       *obj_desc;
	union acpi_operand_object       *operand_desc;
	struct acpi_namespace_node      *node;
	union acpi_parse_object         *next_op;


	ACPI_FUNCTION_TRACE_PTR ("ds_eval_region_operands", op);


	/*
	 * This is where we evaluate the address and length fields of the op_region declaration
	 */
	node =  op->common.node;

	/* next_op points to the op that holds the space_iD */

	next_op = op->common.value.arg;

	/* next_op points to address op */

	next_op = next_op->common.next;

	/* Evaluate/create the address and length operands */

	status = acpi_ds_create_operands (walk_state, next_op);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Resolve the length and address operands to numbers */

	status = acpi_ex_resolve_operands (op->common.aml_opcode, ACPI_WALK_OPERANDS, walk_state);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
			  acpi_ps_get_opcode_name (op->common.aml_opcode),
			  1, "after acpi_ex_resolve_operands");

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc) {
		return_ACPI_STATUS (AE_NOT_EXIST);
	}

	/*
	 * Get the length operand and save it
	 * (at Top of stack)
	 */
	operand_desc = walk_state->operands[walk_state->num_operands - 1];

	obj_desc->region.length = (u32) operand_desc->integer.value;
	acpi_ut_remove_reference (operand_desc);

	/*
	 * Get the address and save it
	 * (at top of stack - 1)
	 */
	operand_desc = walk_state->operands[walk_state->num_operands - 2];

	obj_desc->region.address = (acpi_physical_address) operand_desc->integer.value;
	acpi_ut_remove_reference (operand_desc);

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "rgn_obj %p Addr %8.8X%8.8X Len %X\n",
		obj_desc,
		ACPI_FORMAT_UINT64 (obj_desc->region.address),
		obj_desc->region.length));

	/* Now the address and length are valid for this opregion */

	obj_desc->region.flags |= AOPOBJ_DATA_VALID;

	return_ACPI_STATUS (status);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_data_object_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid data_object Op object
 *              obj_desc        - data_object
 *
 * RETURN:      Status
 *