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
  50
  51 #define _COMPONENT          ACPI_PARSER
  52          ACPI_MODULE_NAME    ("psxface")
  53
  54 /* Local Prototypes */
  55
  56 static acpi_status
  57 acpi_ps_execute_pass (
  58         struct acpi_parameter_info      *info);
  59
  60 static void
  61 acpi_ps_update_parameter_list (
  62         struct acpi_parameter_info      *info,
  63         u16                             action);
  64
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_ps_execute_method
  69  *
  70  * PARAMETERS:  Info            - Method info block, contains:
  71  *                  Node            - Method Node to execute
  72  *                  obj_desc        - Method object
  73  *                  Parameters      - List of parameters to pass to the method,
  74  *                                    terminated by NULL. Params itself may be
  75  *                                    NULL if no parameters are being passed.
  76  *                  return_object   - Where to put method's return value (if
  77  *                                    any). If NULL, no value is returned.
  78  *                  parameter_type  - Type of Parameter list
  79  *                  return_object   - Where to put method's return value (if
  80  *                                    any). If NULL, no value is returned.
  81  *                  pass_number     - Parse or execute pass
  82  *
  83  * RETURN:      Status
  84  *
  85  * DESCRIPTION: Execute a control method
  86  *
  87  ******************************************************************************/
  88
  89 acpi_status
  90 acpi_ps_execute_method (
  91         struct acpi_parameter_info      *info)
  92 {
  93         acpi_status                     status;
  94
  95
  96         ACPI_FUNCTION_TRACE ("ps_execute_method");
  97
  98
  99         /* Validate the Info and method Node */
 100
 101         if (!info || !info->node) {
 102                 return_ACPI_STATUS (AE_NULL_ENTRY);
 103         }
 104
 105         /* Init for new method, wait on concurrency semaphore */
 106
 107         status = acpi_ds_begin_method_execution (info->node, info->obj_desc, NULL);
 108         if (ACPI_FAILURE (status)) {
 109                 return_ACPI_STATUS (status);
 110         }
 111
 112         /*
 113          * Get a new owner_id for objects created by this method. Namespace
 114          * objects (such as Operation Regions) can be created during the
 115          * first pass parse.
 116          */
 117         status = acpi_ut_allocate_owner_id (&info->obj_desc->method.owner_id);
 118         if (ACPI_FAILURE (status)) {
 119                 return_ACPI_STATUS (status);
 120         }
 121
 122         /*
 123          * The caller "owns" the parameters, so give each one an extra
 124          * reference
 125          */
 126         acpi_ps_update_parameter_list (info, REF_INCREMENT);
 127
 128         /*
 129          * 1) Perform the first pass parse of the method to enter any
 130          *    named objects that it creates into the namespace
 131          */
 132         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 133                 "**** Begin Method Parse **** Entry=%p obj=%p\n",
 134                 info->node, info->obj_desc));
 135
 136         info->pass_number = 1;
 137         status = acpi_ps_execute_pass (info);
 138         if (ACPI_FAILURE (status)) {
 139                 goto cleanup;
 140         }
 141
 142         /*
 143          * 2) Execute the method. Performs second pass parse simultaneously
 144          */
 145         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 146                 "**** Begin Method Execution **** Entry=%p obj=%p\n",
 147                 info->node, info->obj_desc));
 148
 149         info->pass_number = 3;
 150         status = acpi_ps_execute_pass (info);
 151
 152
 153 cleanup:
 154         if (info->obj_desc->method.owner_id) {
 155                 acpi_ut_release_owner_id (&info->obj_desc->method.owner_id);
 156         }
 157
 158         /* Take away the extra reference that we gave the parameters above */
 159
 160         acpi_ps_update_parameter_list (info, REF_DECREMENT);
 161
 162         /* Exit now if error above */
 163
 164         if (ACPI_FAILURE (status)) {
 165                 return_ACPI_STATUS (status);
 166         }
 167
 168         /*
 169          * If the method has returned an object, signal this to the caller with
 170          * a control exception code
 171          */
 172         if (info->return_object) {
 173                 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Method returned obj_desc=%p\n",
 174                         info->return_object));
 175                 ACPI_DUMP_STACK_ENTRY (info->return_object);
 176
 177                 status = AE_CTRL_RETURN_VALUE;
 178         }
 179
 180         return_ACPI_STATUS (status);
 181 }
 182
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_ps_update_parameter_list
 187  *
 188  * PARAMETERS:  Info            - See struct acpi_parameter_info
 189  *                                (Used: parameter_type and Parameters)
 190  *              Action          - Add or Remove reference
 191  *
 192  * RETURN:      Status
 193  *
 194  * DESCRIPTION: Update reference count on all method parameter objects
 195  *
 196  ******************************************************************************/
 197
 198 static void
 199 acpi_ps_update_parameter_list (
 200         struct acpi_parameter_info      *info,
 201         u16                             action)
 202 {
 203         acpi_native_uint                i;
 204
 205
 206         if ((info->parameter_type == ACPI_PARAM_ARGS) &&
 207                 (info->parameters)) {
 208                 /* Update reference count for each parameter */
 209
 210                 for (i = 0; info->parameters[i]; i++) {
 211                         /* Ignore errors, just do them all */
 212
 213                         (void) acpi_ut_update_object_reference (info->parameters[i], action);
 214                 }
 215         }
 216 }
 217
 218
 219 /*******************************************************************************
 220  *
 221  * FUNCTION:    acpi_ps_execute_pass
 222  *
 223  * PARAMETERS:  Info            - See struct acpi_parameter_info
 224  *                                (Used: pass_number, Node, and obj_desc)
 225  *
 226  * RETURN:      Status
 227  *
 228  * DESCRIPTION: Single AML pass: Parse or Execute a control method
 229  *
 230  ******************************************************************************/
 231
 232 static acpi_status
 233 acpi_ps_execute_pass (
 234         struct acpi_parameter_info      *info)
 235 {
 236         acpi_status                     status;
 237         union acpi_parse_object         *op;
 238         struct acpi_walk_state          *walk_state;
 239
 240
 241         ACPI_FUNCTION_TRACE ("ps_execute_pass");
 242
 243
 244         /* Create and init a Root Node */
 245
 246         op = acpi_ps_create_scope_op ();
 247         if (!op) {
 248                 return_ACPI_STATUS (AE_NO_MEMORY);
 249         }
 250
 251         /* Create and initialize a new walk state */
 252
 253         walk_state = acpi_ds_create_walk_state (
 254                           info->obj_desc->method.owner_id, NULL, NULL, NULL);
 255         if (!walk_state) {
 256                 status = AE_NO_MEMORY;
 257                 goto cleanup;
 258         }
 259
 260         status = acpi_ds_init_aml_walk (walk_state, op, info->node,
 261                           info->obj_desc->method.aml_start,
 262                           info->obj_desc->method.aml_length,
 263                           info->pass_number == 1 ? NULL : info,
 264                           info->pass_number);
 265         if (ACPI_FAILURE (status)) {
 266                 acpi_ds_delete_walk_state (walk_state);
 267                 goto cleanup;
 268         }
 269
 270         /* Parse the AML */
 271
 272         status = acpi_ps_parse_aml (walk_state);
 273
 274         /* Walk state was deleted by parse_aml */
 275
 276 cleanup:
 277         acpi_ps_delete_parse_tree (op);
 278         return_ACPI_STATUS (status);
 279 }
 280
 281