2 /******************************************************************************
4 * Module Name: exutils - interpreter/scanner utilities
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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.
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
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
60 #define DEFINE_AML_GLOBALS
62 #include <acpi/acpi.h>
63 #include <acpi/acinterp.h>
64 #include <acpi/amlcode.h>
65 #include <acpi/acevents.h>
67 #define _COMPONENT ACPI_EXECUTER
68 ACPI_MODULE_NAME ("exutils")
70 /* Local prototypes */
73 acpi_ex_digits_needed (
78 #ifndef ACPI_NO_METHOD_EXECUTION
79 /*******************************************************************************
81 * FUNCTION: acpi_ex_enter_interpreter
87 * DESCRIPTION: Enter the interpreter execution region. Failure to enter
88 * the interpreter region is a fatal system error
90 ******************************************************************************/
93 acpi_ex_enter_interpreter (
98 ACPI_FUNCTION_TRACE ("ex_enter_interpreter");
101 status = acpi_ut_acquire_mutex (ACPI_MTX_EXECUTE);
102 if (ACPI_FAILURE (status)) {
103 ACPI_REPORT_ERROR (("Could not acquire interpreter mutex\n"));
106 return_ACPI_STATUS (status);
110 /*******************************************************************************
112 * FUNCTION: acpi_ex_exit_interpreter
118 * DESCRIPTION: Exit the interpreter execution region
120 * Cases where the interpreter is unlocked:
121 * 1) Completion of the execution of a control method
122 * 2) Method blocked on a Sleep() AML opcode
123 * 3) Method blocked on an Acquire() AML opcode
124 * 4) Method blocked on a Wait() AML opcode
125 * 5) Method blocked to acquire the global lock
126 * 6) Method blocked to execute a serialized control method that is
128 * 7) About to invoke a user-installed opregion handler
130 ******************************************************************************/
133 acpi_ex_exit_interpreter (
139 ACPI_FUNCTION_TRACE ("ex_exit_interpreter");
142 status = acpi_ut_release_mutex (ACPI_MTX_EXECUTE);
143 if (ACPI_FAILURE (status)) {
144 ACPI_REPORT_ERROR (("Could not release interpreter mutex\n"));
151 /*******************************************************************************
153 * FUNCTION: acpi_ex_truncate_for32bit_table
155 * PARAMETERS: obj_desc - Object to be truncated
159 * DESCRIPTION: Truncate a number to 32-bits if the currently executing method
160 * belongs to a 32-bit ACPI table.
162 ******************************************************************************/
165 acpi_ex_truncate_for32bit_table (
166 union acpi_operand_object *obj_desc)
169 ACPI_FUNCTION_ENTRY ();
173 * Object must be a valid number and we must be executing
177 (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_INTEGER)) {
181 if (acpi_gbl_integer_byte_width == 4) {
183 * We are running a method that exists in a 32-bit ACPI table.
184 * Truncate the value to 32 bits by zeroing out the upper 32-bit field
186 obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX;
191 /*******************************************************************************
193 * FUNCTION: acpi_ex_acquire_global_lock
195 * PARAMETERS: field_flags - Flags with Lock rule:
196 * always_lock or never_lock
198 * RETURN: TRUE/FALSE indicating whether the lock was actually acquired
200 * DESCRIPTION: Obtain the global lock and keep track of this fact via two
201 * methods. A global variable keeps the state of the lock, and
202 * the state is returned to the caller.
204 ******************************************************************************/
207 acpi_ex_acquire_global_lock (
214 ACPI_FUNCTION_TRACE ("ex_acquire_global_lock");
217 /* Only attempt lock if the always_lock bit is set */
219 if (field_flags & AML_FIELD_LOCK_RULE_MASK) {
220 /* We should attempt to get the lock, wait forever */
222 status = acpi_ev_acquire_global_lock (ACPI_WAIT_FOREVER);
223 if (ACPI_SUCCESS (status)) {
227 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
228 "Could not acquire Global Lock, %s\n",
229 acpi_format_exception (status)));
233 return_VALUE (locked);
237 /*******************************************************************************
239 * FUNCTION: acpi_ex_release_global_lock
241 * PARAMETERS: locked_by_me - Return value from corresponding call to
242 * acquire_global_lock.
246 * DESCRIPTION: Release the global lock if it is locked.
248 ******************************************************************************/
251 acpi_ex_release_global_lock (
257 ACPI_FUNCTION_TRACE ("ex_release_global_lock");
260 /* Only attempt unlock if the caller locked it */
263 /* OK, now release the lock */
265 status = acpi_ev_release_global_lock ();
266 if (ACPI_FAILURE (status)) {
267 /* Report the error, but there isn't much else we can do */
269 ACPI_REPORT_ERROR (("Could not release ACPI Global Lock, %s\n",
270 acpi_format_exception (status)));
278 /*******************************************************************************
280 * FUNCTION: acpi_ex_digits_needed
282 * PARAMETERS: Value - Value to be represented
283 * Base - Base of representation
285 * RETURN: The number of digits.
287 * DESCRIPTION: Calculate the number of digits needed to represent the Value
288 * in the given Base (Radix)
290 ******************************************************************************/
293 acpi_ex_digits_needed (
298 acpi_integer current_value;
301 ACPI_FUNCTION_TRACE ("ex_digits_needed");
304 /* acpi_integer is unsigned, so we don't worry about a '-' prefix */
310 current_value = value;
313 /* Count the digits in the requested base */
315 while (current_value) {
316 (void) acpi_ut_short_divide (current_value, base, ¤t_value, NULL);
320 return_VALUE (num_digits);
324 /*******************************************************************************
326 * FUNCTION: acpi_ex_eisa_id_to_string
328 * PARAMETERS: numeric_id - EISA ID to be converted
329 * out_string - Where to put the converted string (8 bytes)
333 * DESCRIPTION: Convert a numeric EISA ID to string representation
335 ******************************************************************************/
338 acpi_ex_eisa_id_to_string (
345 ACPI_FUNCTION_ENTRY ();
348 /* Swap ID to big-endian to get contiguous bits */
350 eisa_id = acpi_ut_dword_byte_swap (numeric_id);
352 out_string[0] = (char) ('@' + (((unsigned long) eisa_id >> 26) & 0x1f));
353 out_string[1] = (char) ('@' + ((eisa_id >> 21) & 0x1f));
354 out_string[2] = (char) ('@' + ((eisa_id >> 16) & 0x1f));
355 out_string[3] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 12);
356 out_string[4] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 8);
357 out_string[5] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 4);
358 out_string[6] = acpi_ut_hex_to_ascii_char ((acpi_integer) eisa_id, 0);
363 /*******************************************************************************
365 * FUNCTION: acpi_ex_unsigned_integer_to_string
367 * PARAMETERS: Value - Value to be converted
368 * out_string - Where to put the converted string (8 bytes)
370 * RETURN: None, string
372 * DESCRIPTOIN: Convert a number to string representation. Assumes string
373 * buffer is large enough to hold the string.
375 ******************************************************************************/
378 acpi_ex_unsigned_integer_to_string (
387 ACPI_FUNCTION_ENTRY ();
390 digits_needed = acpi_ex_digits_needed (value, 10);
391 out_string[digits_needed] = 0;
393 for (count = digits_needed; count > 0; count--) {
394 (void) acpi_ut_short_divide (value, 10, &value, &remainder);
395 out_string[count-1] = (char) ('0' + remainder);\