1 /******************************************************************************
3 * Module Name: examples - Example ACPICA initialization and execution code
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
12 * All rights reserved.
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18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
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44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
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51 * must include a prominent statement that the modification is derived,
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54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
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62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
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68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
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76 * Intel shall be used in advertising or otherwise to promote the sale, use or
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99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
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114 *****************************************************************************/
116 #include "examples.h"
118 #define _COMPONENT ACPI_EXAMPLE
119 ACPI_MODULE_NAME ("examples")
122 /******************************************************************************
124 * ACPICA Example Code
126 * This module contains examples of how the host OS should interface to the
129 * 1) How to use the platform/acenv.h file and how to set configuration
132 * 2) main - using the debug output mechanism and the error/warning output
135 * 3) Two examples of the ACPICA initialization sequence. The first is a
136 * initialization with no "early" ACPI table access. The second shows
137 * how to use ACPICA to obtain the tables very early during kernel
138 * initialization, even before dynamic memory is available.
140 * 4) How to invoke a control method, including argument setup and how to
141 * access the return value.
143 *****************************************************************************/
146 /* Local Prototypes */
149 InitializeFullAcpica (void);
152 InstallHandlers (void);
163 ACPI_PHYSICAL_ADDRESS Address,
166 void *HandlerContext,
167 void *RegionContext);
171 ACPI_HANDLE RegionHandle,
173 void *HandlerContext,
174 void **RegionContext);
183 InitializeAcpiTables (
191 /******************************************************************************
195 * PARAMETERS: argc, argv
199 * DESCRIPTION: Main routine. Shows the use of the various output macros, as
200 * well as the use of the debug layer/level globals.
202 *****************************************************************************/
204 int ACPI_SYSTEM_XFACE
210 ACPI_DEBUG_INITIALIZE (); /* For debug version only */
212 printf (ACPI_COMMON_SIGNON ("ACPI Example Code"));
214 /* Initialize the local ACPI tables (RSDP/RSDT/XSDT/FADT/DSDT/FACS) */
216 ExInitializeAcpiTables ();
218 /* Initialize the ACPICA subsystem */
220 InitializeFullAcpica ();
222 /* Example warning and error output */
224 ACPI_INFO ((AE_INFO, "Example ACPICA info message"));
225 ACPI_WARNING ((AE_INFO, "Example ACPICA warning message"));
226 ACPI_ERROR ((AE_INFO, "Example ACPICA error message"));
227 ACPI_EXCEPTION ((AE_INFO, AE_AML_OPERAND_TYPE, "Example ACPICA exception message"));
235 /******************************************************************************
237 * Example ACPICA initialization code. This shows a full initialization with
238 * no early ACPI table access.
240 *****************************************************************************/
243 InitializeFullAcpica (void)
248 /* Initialize the ACPICA subsystem */
250 Status = AcpiInitializeSubsystem ();
251 if (ACPI_FAILURE (Status))
253 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing ACPICA"));
257 /* Initialize the ACPICA Table Manager and get all ACPI tables */
259 ACPI_INFO ((AE_INFO, "Loading ACPI tables"));
261 Status = AcpiInitializeTables (NULL, 16, FALSE);
262 if (ACPI_FAILURE (Status))
264 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing Table Manager"));
268 /* Create the ACPI namespace from ACPI tables */
270 Status = AcpiLoadTables ();
271 if (ACPI_FAILURE (Status))
273 ACPI_EXCEPTION ((AE_INFO, Status, "While loading ACPI tables"));
277 /* Install local handlers */
279 Status = InstallHandlers ();
280 if (ACPI_FAILURE (Status))
282 ACPI_EXCEPTION ((AE_INFO, Status, "While installing handlers"));
286 /* Initialize the ACPI hardware */
288 Status = AcpiEnableSubsystem (ACPI_FULL_INITIALIZATION);
289 if (ACPI_FAILURE (Status))
291 ACPI_EXCEPTION ((AE_INFO, Status, "While enabling ACPICA"));
295 /* Complete the ACPI namespace object initialization */
297 Status = AcpiInitializeObjects (ACPI_FULL_INITIALIZATION);
298 if (ACPI_FAILURE (Status))
300 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing ACPICA objects"));
308 /******************************************************************************
310 * Example ACPICA initialization code with early ACPI table access. This shows
311 * an initialization that requires early access to ACPI tables (before
312 * kernel dynamic memory is available)
314 *****************************************************************************/
317 * The purpose of this static table array is to avoid the use of kernel
318 * dynamic memory which may not be available during early ACPI table
321 #define ACPI_MAX_INIT_TABLES 16
322 static ACPI_TABLE_DESC TableArray[ACPI_MAX_INIT_TABLES];
326 * This function would be called early in kernel initialization. After this
327 * is called, all ACPI tables are available to the host.
330 InitializeAcpiTables (
336 /* Initialize the ACPICA Table Manager and get all ACPI tables */
338 Status = AcpiInitializeTables (TableArray, ACPI_MAX_INIT_TABLES, TRUE);
344 * This function would be called after the kernel is initialized and
345 * dynamic/virtual memory is available. It completes the initialization of
346 * the ACPICA subsystem.
355 /* Initialize the ACPICA subsystem */
357 Status = AcpiInitializeSubsystem ();
358 if (ACPI_FAILURE (Status))
363 /* Copy the root table list to dynamic memory */
365 Status = AcpiReallocateRootTable ();
366 if (ACPI_FAILURE (Status))
371 /* Create the ACPI namespace from ACPI tables */
373 Status = AcpiLoadTables ();
374 if (ACPI_FAILURE (Status))
379 /* Install local handlers */
381 Status = InstallHandlers ();
382 if (ACPI_FAILURE (Status))
384 ACPI_EXCEPTION ((AE_INFO, Status, "While installing handlers"));
388 /* Initialize the ACPI hardware */
390 Status = AcpiEnableSubsystem (ACPI_FULL_INITIALIZATION);
391 if (ACPI_FAILURE (Status))
396 /* Complete the ACPI namespace object initialization */
398 Status = AcpiInitializeObjects (ACPI_FULL_INITIALIZATION);
399 if (ACPI_FAILURE (Status))
408 /******************************************************************************
410 * Example ACPICA handler and handler installation
412 *****************************************************************************/
421 ACPI_INFO ((AE_INFO, "Received a notify 0x%X", Value));
427 ACPI_HANDLE RegionHandle,
429 void *HandlerContext,
430 void **RegionContext)
433 if (Function == ACPI_REGION_DEACTIVATE)
435 *RegionContext = NULL;
439 *RegionContext = RegionHandle;
449 ACPI_PHYSICAL_ADDRESS Address,
452 void *HandlerContext,
456 ACPI_INFO ((AE_INFO, "Received a region access"));
463 InstallHandlers (void)
468 /* Install global notify handler */
470 Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
471 NotifyHandler, NULL);
472 if (ACPI_FAILURE (Status))
474 ACPI_EXCEPTION ((AE_INFO, Status, "While installing Notify handler"));
478 Status = AcpiInstallAddressSpaceHandler (ACPI_ROOT_OBJECT, ACPI_ADR_SPACE_SYSTEM_MEMORY,
479 RegionHandler, RegionInit, NULL);
480 if (ACPI_FAILURE (Status))
482 ACPI_EXCEPTION ((AE_INFO, Status, "While installing an OpRegion handler"));
490 /******************************************************************************
492 * Examples of control method execution.
494 * _OSI is a predefined method that is implemented internally within ACPICA.
496 * Shows the following elements:
498 * 1) How to setup a control method argument and argument list
499 * 2) How to setup the return value object
500 * 3) How to invoke AcpiEvaluateObject
501 * 4) How to check the returned ACPI_STATUS
502 * 5) How to analyze the return value
504 *****************************************************************************/
510 ACPI_OBJECT_LIST ArgList;
512 ACPI_BUFFER ReturnValue;
516 ACPI_INFO ((AE_INFO, "Executing _OSI reserved method"));
518 /* Setup input argument */
521 ArgList.Pointer = Arg;
523 Arg[0].Type = ACPI_TYPE_STRING;
524 Arg[0].String.Pointer = "Windows 2001";
525 Arg[0].String.Length = strlen (Arg[0].String.Pointer);
527 /* Ask ACPICA to allocate space for the return object */
529 ReturnValue.Length = ACPI_ALLOCATE_BUFFER;
531 Status = AcpiEvaluateObject (NULL, "\\_OSI", &ArgList, &ReturnValue);
532 if (ACPI_FAILURE (Status))
534 ACPI_EXCEPTION ((AE_INFO, Status, "While executing _OSI"));
538 /* Ensure that the return object is large enough */
540 if (ReturnValue.Length < sizeof (ACPI_OBJECT))
542 AcpiOsPrintf ("Return value from _OSI method too small, %.8X\n",
547 /* Expect an integer return value from execution of _OSI */
549 Object = ReturnValue.Pointer;
550 if (Object->Type != ACPI_TYPE_INTEGER)
552 AcpiOsPrintf ("Invalid return type from _OSI, %.2X\n", Object->Type);
555 ACPI_INFO ((AE_INFO, "_OSI returned 0x%8.8X", (UINT32) Object->Integer.Value));
560 /* Free a buffer created via ACPI_ALLOCATE_BUFFER */
562 AcpiOsFree (ReturnValue.Pointer);
566 /******************************************************************************
568 * Execute an actual control method in the DSDT (MAIN)
570 *****************************************************************************/
576 ACPI_OBJECT_LIST ArgList;
578 ACPI_BUFFER ReturnValue;
582 ACPI_INFO ((AE_INFO, "Executing MAIN method"));
584 /* Setup input argument */
587 ArgList.Pointer = Arg;
589 Arg[0].Type = ACPI_TYPE_STRING;
590 Arg[0].String.Pointer = "Method [MAIN] is executing";
591 Arg[0].String.Length = strlen (Arg[0].String.Pointer);
593 /* Ask ACPICA to allocate space for the return object */
595 ReturnValue.Length = ACPI_ALLOCATE_BUFFER;
597 Status = AcpiEvaluateObject (NULL, "\\MAIN", &ArgList, &ReturnValue);
598 if (ACPI_FAILURE (Status))
600 ACPI_EXCEPTION ((AE_INFO, Status, "While executing MAIN"));
604 if (ReturnValue.Pointer)
606 /* Obtain and validate the returned ACPI_OBJECT */
608 Object = ReturnValue.Pointer;
609 if (Object->Type == ACPI_TYPE_STRING)
611 AcpiOsPrintf ("Method [MAIN] returned: \"%s\"\n", Object->String.Pointer);
614 ACPI_FREE (ReturnValue.Pointer);