psargs.c

来自「linux2.6.16版本」· C语言 代码 · 共 722 行 · 第 1/2 页

	/* Save the namepath */

	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)
{
	u32 length;
	u16 opcode;
	u8 *aml = parser_state->aml;

	ACPI_FUNCTION_TRACE_U32("ps_get_next_simple_arg", arg_type);

	switch (arg_type) {
	case ARGP_BYTEDATA:

		/* Get 1 byte from the AML stream */

		opcode = AML_BYTE_OP;
		arg->common.value.integer = (acpi_integer) * aml;
		length = 1;
		break;

	case ARGP_WORDDATA:

		/* Get 2 bytes from the AML stream */

		opcode = AML_WORD_OP;
		ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
		length = 2;
		break;

	case ARGP_DWORDDATA:

		/* Get 4 bytes from the AML stream */

		opcode = AML_DWORD_OP;
		ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
		length = 4;
		break;

	case ARGP_QWORDDATA:

		/* Get 8 bytes from the AML stream */

		opcode = AML_QWORD_OP;
		ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
		length = 8;
		break;

	case ARGP_CHARLIST:

		/* Get a pointer to the string, point past the string */

		opcode = AML_STRING_OP;
		arg->common.value.string = ACPI_CAST_PTR(char, aml);

		/* Find the null terminator */

		length = 0;
		while (aml[length]) {
			length++;
		}
		length++;
		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);
		return_VOID;

	default:

		ACPI_ERROR((AE_INFO, "Invalid arg_type %X", arg_type));
		return_VOID;
	}

	acpi_ps_init_op(arg, opcode);
	parser_state->aml += length;
	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)
 *
 ******************************************************************************/

static 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 =
		    (((u32) 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:  walk_state          - Current state
 *              parser_state        - Current parser state object
 *              arg_type            - The argument type (AML_*_ARG)
 *              return_arg          - Where the next arg is returned
 *
 * 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_ERROR((AE_INFO, "Invalid arg_type: %X", arg_type));
		status = AE_AML_OPERAND_TYPE;
		break;
	}

	*return_arg = arg;
	return_ACPI_STATUS(status);
}