err.no Git - linux-2.6/blob - 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 #include <acpi/acpi.h>
  45 #include <acpi/acparser.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/acinterp.h>
  48
  49 #define _COMPONENT          ACPI_PARSER
  50 ACPI_MODULE_NAME("psxface")
  51
  52 /* Local Prototypes */
  53 static acpi_status acpi_ps_execute_pass(struct acpi_parameter_info *info);
  54
  55 static void
  56 acpi_ps_update_parameter_list(struct acpi_parameter_info *info, u16 action);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_ps_execute_method
  61  *
  62  * PARAMETERS:  Info            - Method info block, contains:
  63  *                  Node            - Method Node to execute
  64  *                  obj_desc        - Method object
  65  *                  Parameters      - List of parameters to pass to the method,
  66  *                                    terminated by NULL. Params itself may be
  67  *                                    NULL if no parameters are being passed.
  68  *                  return_object   - Where to put method's return value (if
  69  *                                    any). If NULL, no value is returned.
  70  *                  parameter_type  - Type of Parameter list
  71  *                  return_object   - Where to put method's return value (if
  72  *                                    any). If NULL, no value is returned.
  73  *                  pass_number     - Parse or execute pass
  74  *
  75  * RETURN:      Status
  76  *
  77  * DESCRIPTION: Execute a control method
  78  *
  79  ******************************************************************************/
  80
  81 acpi_status acpi_ps_execute_method(struct acpi_parameter_info *info)
  82 {
  83         acpi_status status;
  84
  85         ACPI_FUNCTION_TRACE("ps_execute_method");
  86
  87         /* Validate the Info and method Node */
  88
  89         if (!info || !info->node) {
  90                 return_ACPI_STATUS(AE_NULL_ENTRY);
  91         }
  92
  93         /* Init for new method, wait on concurrency semaphore */
  94
  95         status =
  96             acpi_ds_begin_method_execution(info->node, info->obj_desc, NULL);
  97         if (ACPI_FAILURE(status)) {
  98                 return_ACPI_STATUS(status);
  99         }
 100
 101         /*
 102          * The caller "owns" the parameters, so give each one an extra
 103          * reference
 104          */
 105         acpi_ps_update_parameter_list(info, REF_INCREMENT);
 106
 107         /*
 108          * 1) Perform the first pass parse of the method to enter any
 109          *    named objects that it creates into the namespace
 110          */
 111         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 112                           "**** Begin Method Parse **** Entry=%p obj=%p\n",
 113                           info->node, info->obj_desc));
 114
 115         info->pass_number = 1;
 116         status = acpi_ps_execute_pass(info);
 117         if (ACPI_FAILURE(status)) {
 118                 goto cleanup;
 119         }
 120
 121         /*
 122          * 2) Execute the method. Performs second pass parse simultaneously
 123          */
 124         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 125                           "**** Begin Method Execution **** Entry=%p obj=%p\n",
 126                           info->node, info->obj_desc));
 127
 128         info->pass_number = 3;
 129         status = acpi_ps_execute_pass(info);
 130
 131       cleanup:
 132
 133         /* Take away the extra reference that we gave the parameters above */
 134
 135         acpi_ps_update_parameter_list(info, REF_DECREMENT);
 136
 137         /* Exit now if error above */
 138
 139         if (ACPI_FAILURE(status)) {
 140                 return_ACPI_STATUS(status);
 141         }
 142
 143         /*
 144          * If the method has returned an object, signal this to the caller with
 145          * a control exception code
 146          */
 147         if (info->return_object) {
 148                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 149                                   "Method returned obj_desc=%p\n",
 150                                   info->return_object));
 151                 ACPI_DUMP_STACK_ENTRY(info->return_object);
 152
 153                 status = AE_CTRL_RETURN_VALUE;
 154         }
 155
 156         return_ACPI_STATUS(status);
 157 }
 158
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    acpi_ps_update_parameter_list
 162  *
 163  * PARAMETERS:  Info            - See struct acpi_parameter_info
 164  *                                (Used: parameter_type and Parameters)
 165  *              Action          - Add or Remove reference
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Update reference count on all method parameter objects
 170  *
 171  ******************************************************************************/
 172
 173 static void
 174 acpi_ps_update_parameter_list(struct acpi_parameter_info *info, u16 action)
 175 {
 176         acpi_native_uint i;
 177
 178         if ((info->parameter_type == ACPI_PARAM_ARGS) && (info->parameters)) {
 179                 /* Update reference count for each parameter */
 180
 181                 for (i = 0; info->parameters[i]; i++) {
 182                         /* Ignore errors, just do them all */
 183
 184                         (void)acpi_ut_update_object_reference(info->
 185                                                               parameters[i],
 186                                                               action);
 187                 }
 188         }
 189 }
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_ps_execute_pass
 194  *
 195  * PARAMETERS:  Info            - See struct acpi_parameter_info
 196  *                                (Used: pass_number, Node, and obj_desc)
 197  *
 198  * RETURN:      Status
 199  *
 200  * DESCRIPTION: Single AML pass: Parse or Execute a control method
 201  *
 202  ******************************************************************************/
 203
 204 static acpi_status acpi_ps_execute_pass(struct acpi_parameter_info *info)
 205 {
 206         acpi_status status;
 207         union acpi_parse_object *op;
 208         struct acpi_walk_state *walk_state;
 209
 210         ACPI_FUNCTION_TRACE("ps_execute_pass");
 211
 212         /* Create and init a Root Node */
 213
 214         op = acpi_ps_create_scope_op();
 215         if (!op) {
 216                 return_ACPI_STATUS(AE_NO_MEMORY);
 217         }
 218
 219         /* Create and initialize a new walk state */
 220
 221         walk_state =
 222             acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
 223                                       NULL, NULL);
 224         if (!walk_state) {
 225                 status = AE_NO_MEMORY;
 226                 goto cleanup;
 227         }
 228
 229         status = acpi_ds_init_aml_walk(walk_state, op, info->node,
 230                                        info->obj_desc->method.aml_start,
 231                                        info->obj_desc->method.aml_length,
 232                                        info->pass_number == 1 ? NULL : info,
 233                                        info->pass_number);
 234         if (ACPI_FAILURE(status)) {
 235                 acpi_ds_delete_walk_state(walk_state);
 236                 goto cleanup;
 237         }
 238
 239         /* Parse the AML */
 240
 241         status = acpi_ps_parse_aml(walk_state);
 242
 243         /* Walk state was deleted by parse_aml */
 244
 245       cleanup:
 246         acpi_ps_delete_parse_tree(op);
 247         return_ACPI_STATUS(status);
 248 }