drivers/acpi/executer/exutils.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exutils - interpreter/scanner utilities
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45
  46 /*
  47  * DEFINE_AML_GLOBALS is tested in amlcode.h
  48  * to determine whether certain global names should be "defined" or only
  49  * "declared" in the current compilation.  This enhances maintainability
  50  * by enabling a single header file to embody all knowledge of the names
  51  * in question.
  52  *
  53  * Exactly one module of any executable should #define DEFINE_GLOBALS
  54  * before #including the header files which use this convention.  The
  55  * names in question will be defined and initialized in that module,
  56  * and declared as extern in all other modules which #include those
  57  * header files.
  58  */
  59
  60 #define DEFINE_AML_GLOBALS
  61
  62 #include <acpi/acpi.h>
  63 #include <acpi/acinterp.h>
  64 #include <acpi/amlcode.h>
  65 #include <acpi/acevents.h>
  66
  67 #define _COMPONENT          ACPI_EXECUTER
  68          ACPI_MODULE_NAME    ("exutils")
  69
  70
  71 #ifndef ACPI_NO_METHOD_EXECUTION
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    acpi_ex_enter_interpreter
  76  *
  77  * PARAMETERS:  None
  78  *
  79  * DESCRIPTION: Enter the interpreter execution region.  Failure to enter
  80  *              the interpreter region is a fatal system error
  81  *
  82  ******************************************************************************/
  83
  84 acpi_status
  85 acpi_ex_enter_interpreter (void)
  86 {
  87         acpi_status                     status;
  88
  89         ACPI_FUNCTION_TRACE ("ex_enter_interpreter");
  90
  91
  92         status = acpi_ut_acquire_mutex (ACPI_MTX_EXECUTE);
  93         if (ACPI_FAILURE (status)) {
  94                 ACPI_REPORT_ERROR (("Could not acquire interpreter mutex\n"));
  95         }
  96
  97         return_ACPI_STATUS (status);
  98 }
  99
 100
 101 /*******************************************************************************
 102  *
 103  * FUNCTION:    acpi_ex_exit_interpreter
 104  *
 105  * PARAMETERS:  None
 106  *
 107  * DESCRIPTION: Exit the interpreter execution region
 108  *
 109  * Cases where the interpreter is unlocked:
 110  *      1) Completion of the execution of a control method
 111  *      2) Method blocked on a Sleep() AML opcode
 112  *      3) Method blocked on an Acquire() AML opcode
 113  *      4) Method blocked on a Wait() AML opcode
 114  *      5) Method blocked to acquire the global lock
 115  *      6) Method blocked to execute a serialized control method that is
 116  *          already executing
 117  *      7) About to invoke a user-installed opregion handler
 118  *
 119  ******************************************************************************/
 120
 121 void
 122 acpi_ex_exit_interpreter (void)
 123 {
 124         acpi_status                     status;
 125
 126
 127         ACPI_FUNCTION_TRACE ("ex_exit_interpreter");
 128
 129
 130         status = acpi_ut_release_mutex (ACPI_MTX_EXECUTE);
 131         if (ACPI_FAILURE (status)) {
 132                 ACPI_REPORT_ERROR (("Could not release interpreter mutex\n"));
 133         }
 134
 135         return_VOID;
 136 }
 137
 138
 139 /*******************************************************************************
 140  *
 141  * FUNCTION:    acpi_ex_truncate_for32bit_table
 142  *
 143  * PARAMETERS:  obj_desc        - Object to be truncated
 144  *
 145  * RETURN:      none
 146  *
 147  * DESCRIPTION: Truncate a number to 32-bits if the currently executing method
 148  *              belongs to a 32-bit ACPI table.
 149  *
 150  ******************************************************************************/
 151
 152 void
 153 acpi_ex_truncate_for32bit_table (
 154         union acpi_operand_object       *obj_desc)
 155 {
 156
 157         ACPI_FUNCTION_ENTRY ();
 158
 159
 160         /*
 161          * Object must be a valid number and we must be executing
 162          * a control method
 163          */
 164         if ((!obj_desc) ||
 165                 (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_INTEGER)) {
 166                 return;
 167         }
 168
 169         if (acpi_gbl_integer_byte_width == 4) {
 170                 /*
 171                  * We are running a method that exists in a 32-bit ACPI table.
 172                  * Truncate the value to 32 bits by zeroing out the upper 32-bit field
 173                  */
 174                 obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX;
 175         }
 176 }
 177
 178
 179 /*******************************************************************************
 180  *
 181  * FUNCTION:    acpi_ex_acquire_global_lock
 182  *
 183  * PARAMETERS:  field_flags           - Flags with Lock rule:
 184  *                                      always_lock or never_lock
 185  *
 186  * RETURN:      TRUE/FALSE indicating whether the lock was actually acquired
 187  *
 188  * DESCRIPTION: Obtain the global lock and keep track of this fact via two
 189  *              methods.  A global variable keeps the state of the lock, and
 190  *              the state is returned to the caller.
 191  *
 192  ******************************************************************************/
 193
 194 u8
 195 acpi_ex_acquire_global_lock (
 196         u32                             field_flags)
 197 {
 198         u8                              locked = FALSE;
 199         acpi_status                     status;
 200
 201
 202         ACPI_FUNCTION_TRACE ("ex_acquire_global_lock");
 203
 204
 205         /* Only attempt lock if the always_lock bit is set */
 206
 207         if (field_flags & AML_FIELD_LOCK_RULE_MASK) {
 208                 /* We should attempt to get the lock, wait forever */
 209
 210                 status = acpi_ev_acquire_global_lock (ACPI_WAIT_FOREVER);
 211                 if (ACPI_SUCCESS (status)) {
 212                         locked = TRUE;
 213                 }
 214                 else {
 215                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not acquire Global Lock, %s\n",
 216                                 acpi_format_exception (status)));
 217                 }
 218         }
 219
 220         return_VALUE (locked);
 221 }
 222
 223
 224 /*******************************************************************************
 225  *
 226  * FUNCTION:    acpi_ex_release_global_lock
 227  *
 228  * PARAMETERS:  locked_by_me    - Return value from corresponding call to
 229  *                                acquire_global_lock.
 230  *
 231  * RETURN:      Status
 232  *
 233  * DESCRIPTION: Release the global lock if it is locked.
 234  *
 235  ******************************************************************************/
 236
 237 void
 238 acpi_ex_release_global_lock (
 239         u8                              locked_by_me)
 240 {
 241         acpi_status                     status;
 242
 243
 244         ACPI_FUNCTION_TRACE ("ex_release_global_lock");
 245
 246
 247         /* Only attempt unlock if the caller locked it */
 248
 249         if (locked_by_me) {
 250                 /* OK, now release the lock */
 251
 252                 status = acpi_ev_release_global_lock ();
 253                 if (ACPI_FAILURE (status)) {
 254                         /* Report the error, but there isn't much else we can do */
 255
 256                         ACPI_REPORT_ERROR (("Could not release ACPI Global Lock, %s\n",
 257                                 acpi_format_exception (status)));
 258                 }
 259         }
 260
 261         return_VOID;
 262 }
 263
 264
 265 /*******************************************************************************
 266  *
 267  * FUNCTION:    acpi_ex_digits_needed
 268  *
 269  * PARAMETERS:  Value           - Value to be represented
 270  *              Base            - Base of representation
 271  *
 272  * RETURN:      the number of digits needed to represent Value in Base
 273  *
 274  ******************************************************************************/
 275
 276 u32
 277 acpi_ex_digits_needed (
 278         acpi_integer                    value,
 279         u32                             base)
 280 {
 281         u32                             num_digits;
 282         acpi_integer                    current_value;
 283
 284
 285         ACPI_FUNCTION_TRACE ("ex_digits_needed");
 286
 287
 288         /* acpi_integer is unsigned, so we don't worry about a '-' prefix */
 289
 290         if (value == 0) {
 291                 return_VALUE (1);
 292         }
 293
 294         current_value = value;
 295         num_digits = 0;
 296
 297         /* Count the digits in the requested base */
 298
 299         while (current_value) {
 300                 (void) acpi_ut_short_divide (current_value, base, &current_value, NULL);
 301                 num_digits++;
 302         }
 303
 304         return_VALUE (num_digits);
 305 }
 306
 307
 308 /*******************************************************************************
 309  *
 310  * FUNCTION:    acpi_ex_eisa_id_to_string
 311  *
 312  * PARAMETERS:  numeric_id      - EISA ID to be converted
 313  *              out_string      - Where to put the converted string (8 bytes)
 314  *
 315  * DESCRIPTION: Convert a numeric EISA ID to string representation
 316  *
 317  ******************************************************************************/
 318
 319 void
 320 acpi_ex_eisa_id_to_string (
 321         u32                             numeric_id,
 322         char                            *out_string)
 323 {
 324         u32                             eisa_id;
 325
 326
 327         ACPI_FUNCTION_ENTRY ();
 328
 329
 330         /* Swap ID to big-endian to get contiguous bits */
 331
 332         eisa_id = acpi_ut_dword_byte_swap (numeric_id);
 333
 334         out_string[0] = (char) ('@' + (((unsigned long) eisa_id >> 26) & 0x1f));
 335         out_string[1] = (char) ('@' + ((eisa_id >> 21) & 0x1f));
 336         out_string[2] = (char) ('@' + ((eisa_id >> 16) & 0x1f));
 337         out_string[3] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 12);
 338         out_string[4] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 8);
 339         out_string[5] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 4);
 340         out_string[6] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 0);
 341         out_string[7] = 0;
 342 }
 343
 344
 345 /*******************************************************************************
 346  *
 347  * FUNCTION:    acpi_ex_unsigned_integer_to_string
 348  *
 349  * PARAMETERS:  Value           - Value to be converted
 350  *              out_string      - Where to put the converted string (8 bytes)
 351  *
 352  * RETURN:      Convert a number to string representation
 353  *
 354  ******************************************************************************/
 355
 356 void
 357 acpi_ex_unsigned_integer_to_string (
 358         acpi_integer                    value,
 359         char                            *out_string)
 360 {
 361         u32                             count;
 362         u32                             digits_needed;
 363         u32                             remainder;
 364
 365
 366         ACPI_FUNCTION_ENTRY ();
 367
 368
 369         digits_needed = acpi_ex_digits_needed (value, 10);
 370         out_string[digits_needed] = 0;
 371
 372         for (count = digits_needed; count > 0; count--) {
 373                 (void) acpi_ut_short_divide (value, 10, &value, &remainder);
 374                 out_string[count-1] = (char) ('0' + remainder);\
 375         }
 376 }
 377
 378 #endif