drivers/acpi/parser/psxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psxface - Parser external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/acnamesp.h>
  50
  51
  52 #define _COMPONENT          ACPI_PARSER
  53          ACPI_MODULE_NAME    ("psxface")
  54
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_psx_execute
  59  *
  60  * PARAMETERS:  Info->Node          - A method object containing both the AML
  61  *                                    address and length.
  62  *              **Params            - List of parameters to pass to method,
  63  *                                    terminated by NULL. Params itself may be
  64  *                                    NULL if no parameters are being passed.
  65  *              **return_obj_desc   - Return object from execution of the
  66  *                                    method.
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Execute a control method
  71  *
  72  ******************************************************************************/
  73
  74 acpi_status
  75 acpi_psx_execute (
  76         struct acpi_parameter_info      *info)
  77 {
  78         acpi_status                     status;
  79         union acpi_operand_object       *obj_desc;
  80         u32                             i;
  81         union acpi_parse_object         *op;
  82         struct acpi_walk_state          *walk_state;
  83
  84
  85         ACPI_FUNCTION_TRACE ("psx_execute");
  86
  87
  88         /* Validate the Node and get the attached object */
  89
  90         if (!info || !info->node) {
  91                 return_ACPI_STATUS (AE_NULL_ENTRY);
  92         }
  93
  94         obj_desc = acpi_ns_get_attached_object (info->node);
  95         if (!obj_desc) {
  96                 return_ACPI_STATUS (AE_NULL_OBJECT);
  97         }
  98
  99         /* Init for new method, wait on concurrency semaphore */
 100
 101         status = acpi_ds_begin_method_execution (info->node, obj_desc, NULL);
 102         if (ACPI_FAILURE (status)) {
 103                 return_ACPI_STATUS (status);
 104         }
 105
 106         if ((info->parameter_type == ACPI_PARAM_ARGS) &&
 107                 (info->parameters)) {
 108                 /*
 109                  * The caller "owns" the parameters, so give each one an extra
 110                  * reference
 111                  */
 112                 for (i = 0; info->parameters[i]; i++) {
 113                         acpi_ut_add_reference (info->parameters[i]);
 114                 }
 115         }
 116
 117         /*
 118          * 1) Perform the first pass parse of the method to enter any
 119          * named objects that it creates into the namespace
 120          */
 121         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 122                 "**** Begin Method Parse **** Entry=%p obj=%p\n",
 123                 info->node, obj_desc));
 124
 125         /* Create and init a Root Node */
 126
 127         op = acpi_ps_create_scope_op ();
 128         if (!op) {
 129                 status = AE_NO_MEMORY;
 130                 goto cleanup1;
 131         }
 132
 133         /*
 134          * Get a new owner_id for objects created by this method. Namespace
 135          * objects (such as Operation Regions) can be created during the
 136          * first pass parse.
 137          */
 138         obj_desc->method.owning_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
 139
 140         /* Create and initialize a new walk state */
 141
 142         walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_id,
 143                            NULL, NULL, NULL);
 144         if (!walk_state) {
 145                 status = AE_NO_MEMORY;
 146                 goto cleanup2;
 147         }
 148
 149         status = acpi_ds_init_aml_walk (walk_state, op, info->node,
 150                           obj_desc->method.aml_start,
 151                           obj_desc->method.aml_length, NULL, 1);
 152         if (ACPI_FAILURE (status)) {
 153                 goto cleanup3;
 154         }
 155
 156         /* Parse the AML */
 157
 158         status = acpi_ps_parse_aml (walk_state);
 159         acpi_ps_delete_parse_tree (op);
 160         if (ACPI_FAILURE (status)) {
 161                 goto cleanup1; /* Walk state is already deleted */
 162         }
 163
 164         /*
 165          * 2) Execute the method.  Performs second pass parse simultaneously
 166          */
 167         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 168                 "**** Begin Method Execution **** Entry=%p obj=%p\n",
 169                 info->node, obj_desc));
 170
 171         /* Create and init a Root Node */
 172
 173         op = acpi_ps_create_scope_op ();
 174         if (!op) {
 175                 status = AE_NO_MEMORY;
 176                 goto cleanup1;
 177         }
 178
 179         /* Init new op with the method name and pointer back to the NS node */
 180
 181         acpi_ps_set_name (op, info->node->name.integer);
 182         op->common.node = info->node;
 183
 184         /* Create and initialize a new walk state */
 185
 186         walk_state = acpi_ds_create_walk_state (0, NULL, NULL, NULL);
 187         if (!walk_state) {
 188                 status = AE_NO_MEMORY;
 189                 goto cleanup2;
 190         }
 191
 192         status = acpi_ds_init_aml_walk (walk_state, op, info->node,
 193                           obj_desc->method.aml_start,
 194                           obj_desc->method.aml_length, info, 3);
 195         if (ACPI_FAILURE (status)) {
 196                 goto cleanup3;
 197         }
 198
 199         /*
 200          * The walk of the parse tree is where we actually execute the method
 201          */
 202         status = acpi_ps_parse_aml (walk_state);
 203         goto cleanup2; /* Walk state already deleted */
 204
 205
 206 cleanup3:
 207         acpi_ds_delete_walk_state (walk_state);
 208
 209 cleanup2:
 210         acpi_ps_delete_parse_tree (op);
 211
 212 cleanup1:
 213         if ((info->parameter_type == ACPI_PARAM_ARGS) &&
 214                 (info->parameters)) {
 215                 /* Take away the extra reference that we gave the parameters above */
 216
 217                 for (i = 0; info->parameters[i]; i++) {
 218                         /* Ignore errors, just do them all */
 219
 220                         (void) acpi_ut_update_object_reference (info->parameters[i], REF_DECREMENT);
 221                 }
 222         }
 223
 224         if (ACPI_FAILURE (status)) {
 225                 return_ACPI_STATUS (status);
 226         }
 227
 228         /*
 229          * If the method has returned an object, signal this to the caller with
 230          * a control exception code
 231          */
 232         if (info->return_object) {
 233                 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Method returned obj_desc=%p\n",
 234                         info->return_object));
 235                 ACPI_DUMP_STACK_ENTRY (info->return_object);
 236
 237                 status = AE_CTRL_RETURN_VALUE;
 238         }
 239
 240         return_ACPI_STATUS (status);
 241 }
 242
 243