psargs.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

					/* Change arg into a METHOD CALL and attach name to it */

					acpi_ps_init_op (arg, AML_METHODCALL_OP);

					name_op->value.name = path;

					/* Point METHODCALL/NAME to the METHOD Node */

					name_op->node = method_node;
					acpi_ps_append_arg (arg, name_op);

					if (!(ACPI_OPERAND_OBJECT  *) method_node->object) {
						return;
					}

					*arg_count = ((ACPI_OPERAND_OBJECT *) method_node->object)->method.param_count;
				}

				return;
			}

			/*
			 * Else this is normal named object reference.
			 * Just init the NAMEPATH object with the pathname.
			 * (See code below)
			 */
		}
	}

	/*
	 * Either we didn't find the object in the namespace, or the object is
	 * something other than a control method.  Just initialize the Op with the
	 * pathname.
	 */

	acpi_ps_init_op (arg, AML_NAMEPATH_OP);
	arg->value.name = path;


	return;
}

#endif

/*******************************************************************************
 *
 * 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 (
	ACPI_PARSE_STATE        *parser_state,
	u32                     arg_type,
	ACPI_PARSE_OBJECT       *arg)
{


	switch (arg_type)
	{

	case ARGP_BYTEDATA:

		acpi_ps_init_op (arg, AML_BYTE_OP);
		arg->value.integer = (u32) 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 */

		MOVE_UNALIGNED16_TO_32 (&arg->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 */

		MOVE_UNALIGNED32_TO_32 (&arg->value.integer, parser_state->aml);
		parser_state->aml += 4;
		break;


	case ARGP_CHARLIST:

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

		while (GET8 (parser_state->aml) != '\0') {
			parser_state->aml++;
		}
		parser_state->aml++;
		break;


	case ARGP_NAME:
	case ARGP_NAMESTRING:

		acpi_ps_init_op (arg, AML_NAMEPATH_OP);
		arg->value.name = acpi_ps_get_next_namestring (parser_state);
		break;
	}

	return;
}


/*******************************************************************************
 *
 * 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)
 *
 ******************************************************************************/

ACPI_PARSE_OBJECT *
acpi_ps_get_next_field (
	ACPI_PARSE_STATE        *parser_state)
{
	ACPI_PTRDIFF            aml_offset = parser_state->aml -
			 parser_state->aml_start;
	ACPI_PARSE_OBJECT       *field;
	u16                     opcode;
	u32                     name;


	/* determine field type */

	switch (GET8 (parser_state->aml))
	{

	default:

		opcode = AML_NAMEDFIELD_OP;
		break;


	case 0x00:

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


	case 0x01:

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


	/* Allocate a new field op */

	field = acpi_ps_alloc_op (opcode);
	if (field) {
		field->aml_offset = aml_offset;

		/* Decode the field type */

		switch (opcode)
		{
		case AML_NAMEDFIELD_OP:

			/* Get the 4-character name */

			MOVE_UNALIGNED32_TO_32 (&name, parser_state->aml);
			acpi_ps_set_name (field, name);
			parser_state->aml += 4;

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

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


		case AML_RESERVEDFIELD_OP:

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

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


		case AML_ACCESSFIELD_OP:

			/* Get Access_type and Access_atrib and merge into the field Op */

			field->value.integer = ((GET8 (parser_state->aml) << 8) |
					  GET8 (parser_state->aml));
			parser_state->aml += 2;
			break;
		}
	}

	return (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:      An op object containing the next argument.
 *
 * DESCRIPTION: Get next argument (including complex list arguments that require
 *              pushing the parser stack)
 *
 ******************************************************************************/

ACPI_PARSE_OBJECT *
acpi_ps_get_next_arg (
	ACPI_PARSE_STATE        *parser_state,
	u32                     arg_type,
	u32                     *arg_count)
{
	ACPI_PARSE_OBJECT       *arg = NULL;
	ACPI_PARSE_OBJECT       *prev = NULL;
	ACPI_PARSE_OBJECT       *field;
	u32                     subop;


	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) {
			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) {
					break;
				}

				if (prev) {
					prev->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_BYTELIST_OP);
			if (arg) {
				/* fill in bytelist data */

				arg->value.size = (parser_state->pkg_end - parser_state->aml);
				((ACPI_PARSE2_OBJECT *) arg)->data = parser_state->aml;
			}

			/* skip to End of byte data */

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


	case ARGP_TARGET:
	case ARGP_SUPERNAME:
		{
			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_NAMEPATH_OP);
				if (arg) {
					acpi_ps_get_next_namepath (parser_state, arg, arg_count, 0);
				}
			}

			else {
				/* single complex argument, nothing returned */

				*arg_count = 1;
			}
		}
		break;


	case ARGP_DATAOBJ:
	case ARGP_TERMARG:

		/* single complex argument, nothing returned */

		*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 */

			*arg_count = ACPI_VAR_ARGS;
		}
		break;
	}

	return (arg);
}