Skip to content
Snippets Groups Projects
Select Git revision
  • ae90fbf562d733a392c7a0ffefe1e09b5a31c99c
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

psargs.c

Blame
  • psargs.c 21.98 KiB
    /******************************************************************************
     *
     * Module Name: psargs - Parse AML opcode arguments
     *
     *****************************************************************************/
    
    /*
     * Copyright (C) 2000 - 2015, Intel Corp.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions, and the following disclaimer,
     *    without modification.
     * 2. Redistributions in binary form must reproduce at minimum a disclaimer
     *    substantially similar to the "NO WARRANTY" disclaimer below
     *    ("Disclaimer") and any redistribution must be conditioned upon
     *    including a substantially similar Disclaimer requirement for further
     *    binary redistribution.
     * 3. Neither the names of the above-listed copyright holders nor the names
     *    of any contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * Alternatively, this software may be distributed under the terms of the
     * GNU General Public License ("GPL") version 2 as published by the Free
     * Software Foundation.
     *
     * NO WARRANTY
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGES.
     */
    
    #include <acpi/acpi.h>
    #include "accommon.h"
    #include "acparser.h"
    #include "amlcode.h"
    #include "acnamesp.h"
    #include "acdispat.h"
    
    #define _COMPONENT          ACPI_PARSER
    ACPI_MODULE_NAME("psargs")
    
    /* Local prototypes */
    static u32
    acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
    
    static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
    						       *parser_state);
    
    /*******************************************************************************
     *
     * FUNCTION:    acpi_ps_get_next_package_length
     *
     * PARAMETERS:  parser_state        - Current parser state object
     *
     * RETURN:      Decoded package length. On completion, the AML pointer points
     *              past the length byte or bytes.
     *
     * DESCRIPTION: Decode and return a package length field.
     *              Note: Largest package length is 28 bits, from ACPI specification
     *
     ******************************************************************************/
    
    static u32
    acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
    {
    	u8 *aml = parser_state->aml;
    	u32 package_length = 0;
    	u32 byte_count;
    	u8 byte_zero_mask = 0x3F;	/* Default [0:5] */
    
    	ACPI_FUNCTION_TRACE(ps_get_next_package_length);
    
    	/*
    	 * Byte 0 bits [6:7] contain the number of additional bytes
    	 * used to encode the package length, either 0,1,2, or 3
    	 */
    	byte_count = (aml[0] >> 6);
    	parser_state->aml += ((acpi_size) byte_count + 1);
    
    	/* Get bytes 3, 2, 1 as needed */
    
    	while (byte_count) {
    		/*
    		 * Final bit positions for the package length bytes:
    		 *      Byte3->[20:27]
    		 *      Byte2->[12:19]
    		 *      Byte1->[04:11]
    		 *      Byte0->[00:03]
    		 */
    		package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
    
    		byte_zero_mask = 0x0F;	/* Use bits [0:3] of byte 0 */
    		byte_count--;
    	}
    
    	/* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
    
    	package_length |= (aml[0] & byte_zero_mask);
    	return_UINT32(package_length);
    }
    
    /*******************************************************************************
     *
     * FUNCTION:    acpi_ps_get_next_package_end
     *
     * PARAMETERS:  parser_state        - Current parser state object
     *
     * RETURN:      Pointer to end-of-package +1
     *
     * DESCRIPTION: Get next package length and return a pointer past the end of
     *              the package. Consumes the package length field
     *
     ******************************************************************************/
    
    u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
    {
    	u8 *start = parser_state->aml;
    	u32 package_length;
    
    	ACPI_FUNCTION_TRACE(ps_get_next_package_end);
    
    	/* Function below updates parser_state->Aml */
    
    	package_length = acpi_ps_get_next_package_length(parser_state);
    
    	return_PTR(start + package_length);	/* end of package */
    }
    
    /*******************************************************************************
     *
     * FUNCTION:    acpi_ps_get_next_namestring
     *
     * PARAMETERS:  parser_state        - Current parser state object
     *
     * RETURN:      Pointer to the start of the name string (pointer points into
     *              the AML.
     *
     * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
     *              prefix characters. Set parser state to point past the string.
     *              (Name is consumed from the AML.)
     *
     ******************************************************************************/
    
    char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
    {
    	u8 *start = parser_state->aml;
    	u8 *end = parser_state->aml;
    
    	ACPI_FUNCTION_TRACE(ps_get_next_namestring);
    
    	/* Point past any namestring prefix characters (backslash or carat) */
    
    	while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) {
    		end++;
    	}
    
    	/* Decode the path prefix character */
    
    	switch (*end) {
    	case 0:
    
    		/* null_name */
    
    		if (end == start) {
    			start = NULL;
    		}
    		end++;
    		break;
    
    	case AML_DUAL_NAME_PREFIX:
    
    		/* Two name segments */
    
    		end += 1 + (2 * ACPI_NAME_SIZE);
    		break;
    
    	case AML_MULTI_NAME_PREFIX_OP:
    
    		/* Multiple name segments, 4 chars each, count in next byte */
    
    		end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
    		break;
    
    	default:
    
    		/* Single name segment */
    
    		end += ACPI_NAME_SIZE;
    		break;
    	}
    
    	parser_state->aml = end;
    	return_PTR((char *)start);
    }
    
    /*******************************************************************************
     *
     * FUNCTION:    acpi_ps_get_next_namepath
     *
     * PARAMETERS:  parser_state        - Current parser state object
     *              arg                 - Where the namepath will be stored
     *              arg_count           - If the namepath points to a control method
     *                                    the method's argument is returned here.
     *              possible_method_call - Whether the namepath can possibly be the
     *                                    start of a method call
     *
     * RETURN:      Status
     *
     * DESCRIPTION: Get next name (if method call, return # of required args).
     *              Names are looked up in the internal namespace to determine
     *              if the name represents a control method. If a method
     *              is found, the number of arguments to the method is returned.
     *              This information is critical for parsing to continue correctly.
     *
     ******************************************************************************/
    
    acpi_status
    acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
    			  struct acpi_parse_state *parser_state,
    			  union acpi_parse_object *arg, u8 possible_method_call)
    {
    	acpi_status status;
    	char *path;
    	union acpi_parse_object *name_op;
    	union acpi_operand_object *method_desc;
    	struct acpi_namespace_node *node;
    	u8 *start = parser_state->aml;
    
    	ACPI_FUNCTION_TRACE(ps_get_next_namepath);
    
    	path = acpi_ps_get_next_namestring(parser_state);
    	acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
    
    	/* Null path case is allowed, just exit */
    
    	if (!path) {
    		arg->common.value.name = path;
    		return_ACPI_STATUS(AE_OK);
    	}
    
    	/*
    	 * Lookup the name in the internal namespace, starting with the current
    	 * scope. We don't want to add anything new to the namespace here,
    	 * however, so we use MODE_EXECUTE.
    	 * Allow searching of the parent tree, but don't open a new scope -
    	 * we just want to lookup the object (must be mode EXECUTE to perform
    	 * the upsearch)
    	 */
    	status = acpi_ns_lookup(walk_state->scope_info, path,
    				ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
    				ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
    				NULL, &node);
    
    	/*
    	 * If this name is a control method invocation, we must
    	 * setup the method call
    	 */
    	if (ACPI_SUCCESS(status) &&
    	    possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
    		if (GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
    		    ARGP_SUPERNAME) {
    			/*
    			 * acpi_ps_get_next_namestring has increased the AML pointer,
    			 * so we need to restore the saved AML pointer for method call.
    			 */
    			walk_state->parser_state.aml = start;
    			walk_state->arg_count = 1;
    			acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
    			return_ACPI_STATUS(AE_OK);
    		}
    
    		/* This name is actually a control method invocation */
    
    		method_desc = acpi_ns_get_attached_object(node);
    		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
    				  "Control Method - %p Desc %p Path=%p\n", node,
    				  method_desc, path));
    
    		name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start);
    		if (!name_op) {
    			return_ACPI_STATUS(AE_NO_MEMORY);
    		}
    
    		/* Change Arg into a METHOD CALL and attach name to it */
    
    		acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
    		name_op->common.value.name = path;
    
    		/* Point METHODCALL/NAME to the METHOD Node */
    
    		name_op->common.node = node;
    		acpi_ps_append_arg(arg, name_op);
    
    		if (!method_desc) {
    			ACPI_ERROR((AE_INFO,
    				    "Control Method %p has no attached object",
    				    node));
    			return_ACPI_STATUS(AE_AML_INTERNAL);
    		}
    
    		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
    				  "Control Method - %p Args %X\n",
    				  node, method_desc->method.param_count));
    
    		/* Get the number of arguments to expect */
    
    		walk_state->arg_count = method_desc->method.param_count;
    		return_ACPI_STATUS(AE_OK);
    	}
    
    	/*
    	 * Special handling if the name was not found during the lookup -
    	 * some not_found cases are allowed
    	 */
    	if (status == AE_NOT_FOUND) {
    
    		/* 1) not_found is ok during load pass 1/2 (allow forward references) */
    
    		if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
    		    ACPI_PARSE_EXECUTE) {
    			status = AE_OK;
    		}
    
    		/* 2) not_found during a cond_ref_of(x) is ok by definition */
    
    		else if (walk_state->op->common.aml_opcode ==
    			 AML_COND_REF_OF_OP) {
    			status = AE_OK;
    		}
    
    		/*
    		 * 3) not_found while building a Package is ok at this point, we
    		 * may flag as an error later if slack mode is not enabled.
    		 * (Some ASL code depends on allowing this behavior)
    		 */
    		else if ((arg->common.parent) &&
    			 ((arg->common.parent->common.aml_opcode ==
    			   AML_PACKAGE_OP)
    			  || (arg->common.parent->common.aml_opcode ==
    			      AML_VAR_PACKAGE_OP))) {
    			status = AE_OK;
    		}
    	}
    
    	/* Final exception check (may have been changed from code above) */
    
    	if (ACPI_FAILURE(status)) {
    		ACPI_ERROR_NAMESPACE(path, status);
    
    		if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
    		    ACPI_PARSE_EXECUTE) {
    
    			/* Report a control method execution error */
    
    			status = acpi_ds_method_error(status, walk_state);
    		}
    	}
    
    	/* 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 = (u64) *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 ArgType 0x%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)
    {
    	u8 *aml;
    	union acpi_parse_object *field;
    	union acpi_parse_object *arg = NULL;
    	u16 opcode;
    	u32 name;
    	u8 access_type;
    	u8 access_attribute;
    	u8 access_length;
    	u32 pkg_length;
    	u8 *pkg_end;
    	u32 buffer_length;
    
    	ACPI_FUNCTION_TRACE(ps_get_next_field);
    
    	aml = parser_state->aml;
    
    	/* Determine field type */
    
    	switch (ACPI_GET8(parser_state->aml)) {
    	case AML_FIELD_OFFSET_OP:
    
    		opcode = AML_INT_RESERVEDFIELD_OP;
    		parser_state->aml++;
    		break;
    
    	case AML_FIELD_ACCESS_OP:
    
    		opcode = AML_INT_ACCESSFIELD_OP;
    		parser_state->aml++;
    		break;
    
    	case AML_FIELD_CONNECTION_OP:
    
    		opcode = AML_INT_CONNECTION_OP;
    		parser_state->aml++;
    		break;
    
    	case AML_FIELD_EXT_ACCESS_OP:
    
    		opcode = AML_INT_EXTACCESSFIELD_OP;
    		parser_state->aml++;
    		break;
    
    	default:
    
    		opcode = AML_INT_NAMEDFIELD_OP;
    		break;
    	}
    
    	/* Allocate a new field op */
    
    	field = acpi_ps_alloc_op(opcode, aml);
    	if (!field) {
    		return_PTR(NULL);
    	}
    
    	/* 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:
    	case AML_INT_EXTACCESSFIELD_OP:
    
    		/*
    		 * Get access_type and access_attrib and merge into the field Op
    		 * access_type is first operand, access_attribute is second. stuff
    		 * these bytes into the node integer value for convenience.
    		 */
    
    		/* Get the two bytes (Type/Attribute) */
    
    		access_type = ACPI_GET8(parser_state->aml);
    		parser_state->aml++;
    		access_attribute = ACPI_GET8(parser_state->aml);
    		parser_state->aml++;
    
    		field->common.value.integer = (u8)access_type;
    		field->common.value.integer |= (u16)(access_attribute << 8);
    
    		/* This opcode has a third byte, access_length */
    
    		if (opcode == AML_INT_EXTACCESSFIELD_OP) {
    			access_length = ACPI_GET8(parser_state->aml);
    			parser_state->aml++;
    
    			field->common.value.integer |=
    			    (u32)(access_length << 16);
    		}
    		break;
    
    	case AML_INT_CONNECTION_OP:
    
    		/*
    		 * Argument for Connection operator can be either a Buffer
    		 * (resource descriptor), or a name_string.
    		 */
    		aml = parser_state->aml;
    		if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
    			parser_state->aml++;
    
    			pkg_end = parser_state->aml;
    			pkg_length =
    			    acpi_ps_get_next_package_length(parser_state);
    			pkg_end += pkg_length;
    
    			if (parser_state->aml < pkg_end) {
    
    				/* Non-empty list */
    
    				arg =
    				    acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml);
    				if (!arg) {
    					acpi_ps_free_op(field);
    					return_PTR(NULL);
    				}
    
    				/* Get the actual buffer length argument */
    
    				opcode = ACPI_GET8(parser_state->aml);
    				parser_state->aml++;
    
    				switch (opcode) {
    				case AML_BYTE_OP:	/* AML_BYTEDATA_ARG */
    
    					buffer_length =
    					    ACPI_GET8(parser_state->aml);
    					parser_state->aml += 1;
    					break;
    
    				case AML_WORD_OP:	/* AML_WORDDATA_ARG */
    
    					buffer_length =
    					    ACPI_GET16(parser_state->aml);
    					parser_state->aml += 2;
    					break;
    
    				case AML_DWORD_OP:	/* AML_DWORDATA_ARG */
    
    					buffer_length =
    					    ACPI_GET32(parser_state->aml);
    					parser_state->aml += 4;
    					break;
    
    				default:
    
    					buffer_length = 0;
    					break;
    				}
    
    				/* Fill in bytelist data */
    
    				arg->named.value.size = buffer_length;
    				arg->named.data = parser_state->aml;
    			}
    
    			/* Skip to End of byte data */
    
    			parser_state->aml = pkg_end;
    		} else {
    			arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml);
    			if (!arg) {
    				acpi_ps_free_op(field);
    				return_PTR(NULL);
    			}
    
    			/* Get the Namestring argument */
    
    			arg->common.value.name =
    			    acpi_ps_get_next_namestring(parser_state);
    		}
    
    		/* Link the buffer/namestring to parent (CONNECTION_OP) */
    
    		acpi_ps_append_arg(field, arg);
    		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 parser argument type (ARGP_*)
     *              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, parser_state->aml);
    		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,
    					       parser_state->aml);
    			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_IS_ROOT_PREFIX(subop) ||
    		    ACPI_IS_PARENT_PREFIX(subop)) {
    
    			/* null_name or name_string */
    
    			arg =
    			    acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
    					     parser_state->aml);
    			if (!arg) {
    				return_ACPI_STATUS(AE_NO_MEMORY);
    			}
    
    			/* super_name allows argument to be a method call */
    
    			if (arg_type == ARGP_SUPERNAME) {
    				status =
    				    acpi_ps_get_next_namepath(walk_state,
    							      parser_state, arg,
    							      ACPI_POSSIBLE_METHOD_CALL);
    
    				/*
    				 * If the super_name arg of Unload is a method call,
    				 * we have restored the AML pointer, just free this Arg
    				 */
    				if (arg->common.aml_opcode ==
    				    AML_INT_METHODCALL_OP) {
    					acpi_ps_free_op(arg);
    					arg = NULL;
    				}
    			} else {
    				status =
    				    acpi_ps_get_next_namepath(walk_state,
    							      parser_state, arg,
    							      ACPI_NOT_METHOD_CALL);
    			}
    		} 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 ArgType: 0x%X", arg_type));
    		status = AE_AML_OPERAND_TYPE;
    		break;
    	}
    
    	*return_arg = arg;
    	return_ACPI_STATUS(status);
    }