psargs.c

linux-2.4.29操作系统的源码

	arg->common.value.name = path;

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_simple_arg
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              arg_type            - The argument type (AML_*_ARG)
 *              Arg                 - Where the argument is returned
 *
 * RETURN:      None
 *
 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 *
 ******************************************************************************/

void
acpi_ps_get_next_simple_arg (
	struct acpi_parse_state         *parser_state,
	u32                             arg_type,
	union acpi_parse_object         *arg)
{

	ACPI_FUNCTION_TRACE_U32 ("ps_get_next_simple_arg", arg_type);


	switch (arg_type) {
	case ARGP_BYTEDATA:

		acpi_ps_init_op (arg, AML_BYTE_OP);
		arg->common.value.integer = (u32) ACPI_GET8 (parser_state->aml);
		parser_state->aml++;
		break;


	case ARGP_WORDDATA:

		acpi_ps_init_op (arg, AML_WORD_OP);

		/* Get 2 bytes from the AML stream */

		ACPI_MOVE_16_TO_32 (&arg->common.value.integer, parser_state->aml);
		parser_state->aml += 2;
		break;


	case ARGP_DWORDDATA:

		acpi_ps_init_op (arg, AML_DWORD_OP);

		/* Get 4 bytes from the AML stream */

		ACPI_MOVE_32_TO_32 (&arg->common.value.integer, parser_state->aml);
		parser_state->aml += 4;
		break;


	case ARGP_QWORDDATA:

		acpi_ps_init_op (arg, AML_QWORD_OP);

		/* Get 8 bytes from the AML stream */

		ACPI_MOVE_64_TO_64 (&arg->common.value.integer, parser_state->aml);
		parser_state->aml += 8;
		break;


	case ARGP_CHARLIST:

		acpi_ps_init_op (arg, AML_STRING_OP);
		arg->common.value.string = (char *) parser_state->aml;

		while (ACPI_GET8 (parser_state->aml) != '\0') {
			parser_state->aml++;
		}
		parser_state->aml++;
		break;


	case ARGP_NAME:
	case ARGP_NAMESTRING:

		acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
		arg->common.value.name = acpi_ps_get_next_namestring (parser_state);
		break;


	default:

		ACPI_REPORT_ERROR (("Invalid arg_type %X\n", arg_type));
		break;
	}

	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_field
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *
 * RETURN:      A newly allocated FIELD op
 *
 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
 *
 ******************************************************************************/

union acpi_parse_object *
acpi_ps_get_next_field (
	struct acpi_parse_state         *parser_state)
{
	u32                             aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
			 parser_state->aml_start);
	union acpi_parse_object         *field;
	u16                             opcode;
	u32                             name;


	ACPI_FUNCTION_TRACE ("ps_get_next_field");


	/* determine field type */

	switch (ACPI_GET8 (parser_state->aml)) {
	default:

		opcode = AML_INT_NAMEDFIELD_OP;
		break;

	case 0x00:

		opcode = AML_INT_RESERVEDFIELD_OP;
		parser_state->aml++;
		break;

	case 0x01:

		opcode = AML_INT_ACCESSFIELD_OP;
		parser_state->aml++;
		break;
	}


	/* Allocate a new field op */

	field = acpi_ps_alloc_op (opcode);
	if (!field) {
		return_PTR (NULL);
	}

	field->common.aml_offset = aml_offset;

	/* Decode the field type */

	switch (opcode) {
	case AML_INT_NAMEDFIELD_OP:

		/* Get the 4-character name */

		ACPI_MOVE_32_TO_32 (&name, parser_state->aml);
		acpi_ps_set_name (field, name);
		parser_state->aml += ACPI_NAME_SIZE;

		/* Get the length which is encoded as a package length */

		field->common.value.size = acpi_ps_get_next_package_length (parser_state);
		break;


	case AML_INT_RESERVEDFIELD_OP:

		/* Get the length which is encoded as a package length */

		field->common.value.size = acpi_ps_get_next_package_length (parser_state);
		break;


	case AML_INT_ACCESSFIELD_OP:

		/*
		 * Get access_type and access_attrib and merge into the field Op
		 * access_type is first operand, access_attribute is second
		 */
		field->common.value.integer = (ACPI_GET8 (parser_state->aml) << 8);
		parser_state->aml++;
		field->common.value.integer |= ACPI_GET8 (parser_state->aml);
		parser_state->aml++;
		break;

	default:

		/* Opcode was set in previous switch */
		break;
	}

	return_PTR (field);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_get_next_arg
 *
 * PARAMETERS:  parser_state        - Current parser state object
 *              arg_type            - The argument type (AML_*_ARG)
 *              arg_count           - If the argument points to a control method
 *                                    the method's argument is returned here.
 *
 * RETURN:      Status, and an op object containing the next argument.
 *
 * DESCRIPTION: Get next argument (including complex list arguments that require
 *              pushing the parser stack)
 *
 ******************************************************************************/

acpi_status
acpi_ps_get_next_arg (
	struct acpi_walk_state          *walk_state,
	struct acpi_parse_state         *parser_state,
	u32                             arg_type,
	union acpi_parse_object         **return_arg)
{
	union acpi_parse_object         *arg = NULL;
	union acpi_parse_object         *prev = NULL;
	union acpi_parse_object         *field;
	u32                             subop;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE_PTR ("ps_get_next_arg", parser_state);


	switch (arg_type) {
	case ARGP_BYTEDATA:
	case ARGP_WORDDATA:
	case ARGP_DWORDDATA:
	case ARGP_CHARLIST:
	case ARGP_NAME:
	case ARGP_NAMESTRING:

		/* constants, strings, and namestrings are all the same size */

		arg = acpi_ps_alloc_op (AML_BYTE_OP);
		if (!arg) {
			return_ACPI_STATUS (AE_NO_MEMORY);
		}
		acpi_ps_get_next_simple_arg (parser_state, arg_type, arg);
		break;


	case ARGP_PKGLENGTH:

		/* Package length, nothing returned */

		parser_state->pkg_end = acpi_ps_get_next_package_end (parser_state);
		break;


	case ARGP_FIELDLIST:

		if (parser_state->aml < parser_state->pkg_end) {
			/* Non-empty list */

			while (parser_state->aml < parser_state->pkg_end) {
				field = acpi_ps_get_next_field (parser_state);
				if (!field) {
					return_ACPI_STATUS (AE_NO_MEMORY);
				}

				if (prev) {
					prev->common.next = field;
				}
				else {
					arg = field;
				}

				prev = field;
			}

			/* Skip to End of byte data */

			parser_state->aml = parser_state->pkg_end;
		}
		break;


	case ARGP_BYTELIST:

		if (parser_state->aml < parser_state->pkg_end) {
			/* Non-empty list */

			arg = acpi_ps_alloc_op (AML_INT_BYTELIST_OP);
			if (!arg) {
				return_ACPI_STATUS (AE_NO_MEMORY);
			}

			/* Fill in bytelist data */

			arg->common.value.size = (u32) ACPI_PTR_DIFF (parser_state->pkg_end,
					  parser_state->aml);
			arg->named.data = parser_state->aml;

			/* Skip to End of byte data */

			parser_state->aml = parser_state->pkg_end;
		}
		break;


	case ARGP_TARGET:
	case ARGP_SUPERNAME:
	case ARGP_SIMPLENAME:

		subop = acpi_ps_peek_opcode (parser_state);
		if (subop == 0                  ||
			acpi_ps_is_leading_char (subop) ||
			acpi_ps_is_prefix_char (subop)) {
			/* null_name or name_string */

			arg = acpi_ps_alloc_op (AML_INT_NAMEPATH_OP);
			if (!arg) {
				return_ACPI_STATUS (AE_NO_MEMORY);
			}

			status = acpi_ps_get_next_namepath (walk_state, parser_state, arg, 0);
		}
		else {
			/* single complex argument, nothing returned */

			walk_state->arg_count = 1;
		}
		break;


	case ARGP_DATAOBJ:
	case ARGP_TERMARG:

		/* single complex argument, nothing returned */

		walk_state->arg_count = 1;
		break;


	case ARGP_DATAOBJLIST:
	case ARGP_TERMLIST:
	case ARGP_OBJLIST:

		if (parser_state->aml < parser_state->pkg_end) {
			/* non-empty list of variable arguments, nothing returned */

			walk_state->arg_count = ACPI_VAR_ARGS;
		}
		break;


	default:

		ACPI_REPORT_ERROR (("Invalid arg_type: %X\n", arg_type));
		status = AE_AML_OPERAND_TYPE;
		break;
	}

	*return_arg = arg;
	return_ACPI_STATUS (status);
}