drivers/acpi/parser/psxface.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: psxface - Parser external interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  *  Copyright (C) 2000 R. Byron Moore
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26
  27 #include "acpi.h"
  28 #include "parser.h"
  29 #include "dispatch.h"
  30 #include "interp.h"
  31 #include "amlcode.h"
  32 #include "namesp.h"
  33
  34
  35 #define _COMPONENT          PARSER
  36          MODULE_NAME         ("psxface");
  37
  38
  39 char    *acpi_gbl_parser_id = "Non-recursive AML Parser";
  40
  41
  42 /*****************************************************************************
  43  *
  44  * FUNCTION:    Acpi_psx_execute
  45  *
  46  * PARAMETERS:  Obj_desc            - A method object containing both the AML
  47  *                                    address and length.
  48  *              **Params            - List of parameters to pass to method,
  49  *                                    terminated by NULL. Params itself may be
  50  *                                    NULL if no parameters are being passed.
  51  *
  52  * RETURN:      Status
  53  *
  54  * DESCRIPTION: Execute a control method
  55  *
  56  ****************************************************************************/
  57
  58 ACPI_STATUS
  59 acpi_psx_execute (
  60         ACPI_NAMED_OBJECT       *method_entry,
  61         ACPI_OBJECT_INTERNAL    **params,
  62         ACPI_OBJECT_INTERNAL    **return_obj_desc)
  63 {
  64         ACPI_STATUS             status;
  65         ACPI_OBJECT_INTERNAL    *obj_desc;
  66         u32                     i;
  67
  68
  69         /* Validate the NTE and get the attached object */
  70
  71         if (!method_entry) {
  72                 return (AE_NULL_ENTRY);
  73         }
  74
  75         obj_desc = acpi_ns_get_attached_object (method_entry);
  76         if (!obj_desc) {
  77                 return (AE_NULL_OBJECT);
  78         }
  79
  80         /* Parse method if necessary, wait on concurrency semaphore */
  81
  82         status = acpi_ds_begin_method_execution (method_entry, obj_desc);
  83         if (ACPI_FAILURE (status)) {
  84                 return (status);
  85         }
  86
  87         if (params) {
  88                 /*
  89                  * The caller "owns" the parameters, so give each one an extra
  90                  * reference
  91                  */
  92
  93                 for (i = 0; params[i]; i++) {
  94                         acpi_cm_add_reference (params[i]);
  95                 }
  96         }
  97
  98         /*
  99          * Method is parsed and ready to execute
 100          * The walk of the parse tree is where we actually execute the method
 101          */
 102
 103         status = acpi_ps_walk_parsed_aml (obj_desc->method.parser_op,
 104                           obj_desc->method.parser_op, obj_desc,
 105                           method_entry->child_table, params, return_obj_desc,
 106                           obj_desc->method.owning_id, acpi_ds_exec_begin_op,
 107                           acpi_ds_exec_end_op);
 108
 109         if (params) {
 110                 /* Take away the extra reference that we gave the parameters above */
 111
 112                 for (i = 0; params[i]; i++) {
 113                         acpi_cm_update_object_reference (params[i], REF_DECREMENT);
 114                 }
 115         }
 116
 117
 118         /*
 119          * Normal exit is with Status == AE_RETURN_VALUE when a Return_op has been
 120          * executed, or with Status == AE_PENDING at end of AML block (end of
 121          * Method code)
 122          */
 123
 124         if (*return_obj_desc) {
 125                 status = AE_CTRL_RETURN_VALUE;
 126         }
 127
 128
 129         return (status);
 130 }
 131
 132