2 /******************************************************************************
4 * Module Name: exutils - interpreter/scanner utilities
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2007, 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.
46 * DEFINE_AML_GLOBALS is tested in amlcode.h
47 * to determine whether certain global names should be "defined" or only
48 * "declared" in the current compilation. This enhances maintainability
49 * by enabling a single header file to embody all knowledge of the names
52 * Exactly one module of any executable should #define DEFINE_GLOBALS
53 * before #including the header files which use this convention. The
54 * names in question will be defined and initialized in that module,
55 * and declared as extern in all other modules which #include those
59 #define DEFINE_AML_GLOBALS
61 #include <acpi/acpi.h>
62 #include <acpi/acinterp.h>
63 #include <acpi/amlcode.h>
64 #include <acpi/acevents.h>
66 #define _COMPONENT ACPI_EXECUTER
67 ACPI_MODULE_NAME("exutils")
69 /* Local prototypes */
70 static u32 acpi_ex_digits_needed(acpi_integer value, u32 base);
72 #ifndef ACPI_NO_METHOD_EXECUTION
73 /*******************************************************************************
75 * FUNCTION: acpi_ex_enter_interpreter
81 * DESCRIPTION: Enter the interpreter execution region. Failure to enter
82 * the interpreter region is a fatal system error. Used in
83 * conjunction with exit_interpreter.
85 ******************************************************************************/
87 void acpi_ex_enter_interpreter(void)
91 ACPI_FUNCTION_TRACE(ex_enter_interpreter);
93 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
94 if (ACPI_FAILURE(status)) {
96 "Could not acquire AML Interpreter mutex"));
102 /*******************************************************************************
104 * FUNCTION: acpi_ex_reacquire_interpreter
110 * DESCRIPTION: Reacquire the interpreter execution region from within the
111 * interpreter code. Failure to enter the interpreter region is a
112 * fatal system error. Used in conjuction with
113 * relinquish_interpreter
115 ******************************************************************************/
117 void acpi_ex_reacquire_interpreter(void)
119 ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);
122 * If the global serialized flag is set, do not release the interpreter,
123 * since it was not actually released by acpi_ex_relinquish_interpreter.
124 * This forces the interpreter to be single threaded.
126 if (!acpi_gbl_all_methods_serialized) {
127 acpi_ex_enter_interpreter();
133 /*******************************************************************************
135 * FUNCTION: acpi_ex_exit_interpreter
141 * DESCRIPTION: Exit the interpreter execution region. This is the top level
142 * routine used to exit the interpreter when all processing has
145 ******************************************************************************/
147 void acpi_ex_exit_interpreter(void)
151 ACPI_FUNCTION_TRACE(ex_exit_interpreter);
153 status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
154 if (ACPI_FAILURE(status)) {
156 "Could not release AML Interpreter mutex"));
162 /*******************************************************************************
164 * FUNCTION: acpi_ex_relinquish_interpreter
170 * DESCRIPTION: Exit the interpreter execution region, from within the
171 * interpreter - before attempting an operation that will possibly
172 * block the running thread.
174 * Cases where the interpreter is unlocked internally
175 * 1) Method to be blocked on a Sleep() AML opcode
176 * 2) Method to be blocked on an Acquire() AML opcode
177 * 3) Method to be blocked on a Wait() AML opcode
178 * 4) Method to be blocked to acquire the global lock
179 * 5) Method to be blocked waiting to execute a serialized control method
180 * that is currently executing
181 * 6) About to invoke a user-installed opregion handler
183 ******************************************************************************/
185 void acpi_ex_relinquish_interpreter(void)
187 ACPI_FUNCTION_TRACE(ex_relinquish_interpreter);
190 * If the global serialized flag is set, do not release the interpreter.
191 * This forces the interpreter to be single threaded.
193 if (!acpi_gbl_all_methods_serialized) {
194 acpi_ex_exit_interpreter();
200 /*******************************************************************************
202 * FUNCTION: acpi_ex_truncate_for32bit_table
204 * PARAMETERS: obj_desc - Object to be truncated
208 * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
209 * 32-bit, as determined by the revision of the DSDT.
211 ******************************************************************************/
213 void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
216 ACPI_FUNCTION_ENTRY();
219 * Object must be a valid number and we must be executing
220 * a control method. NS node could be there for AML_INT_NAMEPATH_OP.
223 (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) ||
224 (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_INTEGER)) {
228 if (acpi_gbl_integer_byte_width == 4) {
230 * We are running a method that exists in a 32-bit ACPI table.
231 * Truncate the value to 32 bits by zeroing out the upper 32-bit field
233 obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX;
237 /*******************************************************************************
239 * FUNCTION: acpi_ex_acquire_global_lock
241 * PARAMETERS: field_flags - Flags with Lock rule:
242 * always_lock or never_lock
246 * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
247 * flags specifiy that it is to be obtained before field access.
249 ******************************************************************************/
251 void acpi_ex_acquire_global_lock(u32 field_flags)
255 ACPI_FUNCTION_TRACE(ex_acquire_global_lock);
257 /* Only use the lock if the always_lock bit is set */
259 if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
263 /* Attempt to get the global lock, wait forever */
265 status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,
266 acpi_gbl_global_lock_mutex,
267 acpi_os_get_thread_id());
269 if (ACPI_FAILURE(status)) {
270 ACPI_EXCEPTION((AE_INFO, status,
271 "Could not acquire Global Lock"));
277 /*******************************************************************************
279 * FUNCTION: acpi_ex_release_global_lock
285 * DESCRIPTION: Release the ACPI hardware Global Lock
287 ******************************************************************************/
289 void acpi_ex_release_global_lock(void)
293 ACPI_FUNCTION_TRACE(ex_release_global_lock);
295 /* Release the global lock */
297 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
298 if (ACPI_FAILURE(status)) {
300 /* Report the error, but there isn't much else we can do */
302 ACPI_EXCEPTION((AE_INFO, status,
303 "Could not release Global Lock"));
309 /*******************************************************************************
311 * FUNCTION: acpi_ex_digits_needed
313 * PARAMETERS: Value - Value to be represented
314 * Base - Base of representation
316 * RETURN: The number of digits.
318 * DESCRIPTION: Calculate the number of digits needed to represent the Value
319 * in the given Base (Radix)
321 ******************************************************************************/
323 static u32 acpi_ex_digits_needed(acpi_integer value, u32 base)
326 acpi_integer current_value;
328 ACPI_FUNCTION_TRACE(ex_digits_needed);
330 /* acpi_integer is unsigned, so we don't worry about a '-' prefix */
336 current_value = value;
339 /* Count the digits in the requested base */
341 while (current_value) {
342 (void)acpi_ut_short_divide(current_value, base, ¤t_value,
347 return_UINT32(num_digits);
350 /*******************************************************************************
352 * FUNCTION: acpi_ex_eisa_id_to_string
354 * PARAMETERS: numeric_id - EISA ID to be converted
355 * out_string - Where to put the converted string (8 bytes)
359 * DESCRIPTION: Convert a numeric EISA ID to string representation
361 ******************************************************************************/
363 void acpi_ex_eisa_id_to_string(u32 numeric_id, char *out_string)
367 ACPI_FUNCTION_ENTRY();
369 /* Swap ID to big-endian to get contiguous bits */
371 eisa_id = acpi_ut_dword_byte_swap(numeric_id);
373 out_string[0] = (char)('@' + (((unsigned long)eisa_id >> 26) & 0x1f));
374 out_string[1] = (char)('@' + ((eisa_id >> 21) & 0x1f));
375 out_string[2] = (char)('@' + ((eisa_id >> 16) & 0x1f));
376 out_string[3] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 12);
377 out_string[4] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 8);
378 out_string[5] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 4);
379 out_string[6] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 0);
383 /*******************************************************************************
385 * FUNCTION: acpi_ex_unsigned_integer_to_string
387 * PARAMETERS: Value - Value to be converted
388 * out_string - Where to put the converted string (8 bytes)
390 * RETURN: None, string
392 * DESCRIPTION: Convert a number to string representation. Assumes string
393 * buffer is large enough to hold the string.
395 ******************************************************************************/
397 void acpi_ex_unsigned_integer_to_string(acpi_integer value, char *out_string)
403 ACPI_FUNCTION_ENTRY();
405 digits_needed = acpi_ex_digits_needed(value, 10);
406 out_string[digits_needed] = 0;
408 for (count = digits_needed; count > 0; count--) {
409 (void)acpi_ut_short_divide(value, 10, &value, &remainder);
410 out_string[count - 1] = (char)('0' + remainder);