1 /******************************************************************************
3 * Module Name: examples - Example ACPICA initialization and execution code
5 *****************************************************************************/
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46 #define _COMPONENT ACPI_EXAMPLE
47 ACPI_MODULE_NAME ("examples")
50 /******************************************************************************
54 * This module contains examples of how the host OS should interface to the
57 * 1) How to use the platform/acenv.h file and how to set configuration
60 * 2) main - using the debug output mechanism and the error/warning output
63 * 3) Two examples of the ACPICA initialization sequence. The first is a
64 * initialization with no "early" ACPI table access. The second shows
65 * how to use ACPICA to obtain the tables very early during kernel
66 * initialization, even before dynamic memory is available.
68 * 4) How to invoke a control method, including argument setup and how to
69 * access the return value.
71 *****************************************************************************/
74 /* Local Prototypes */
77 InitializeFullAcpica (void);
80 InstallHandlers (void);
91 ACPI_PHYSICAL_ADDRESS Address,
99 ACPI_HANDLE RegionHandle,
101 void *HandlerContext,
102 void **RegionContext);
111 InitializeAcpiTables (
119 /******************************************************************************
123 * PARAMETERS: argc, argv
127 * DESCRIPTION: Main routine. Shows the use of the various output macros, as
128 * well as the use of the debug layer/level globals.
130 *****************************************************************************/
132 int ACPI_SYSTEM_XFACE
138 ACPI_DEBUG_INITIALIZE (); /* For debug version only */
140 printf (ACPI_COMMON_SIGNON ("ACPI Example Code"));
142 /* Initialize the local ACPI tables (RSDP/RSDT/XSDT/FADT/DSDT/FACS) */
144 ExInitializeAcpiTables ();
146 /* Initialize the ACPICA subsystem */
148 InitializeFullAcpica ();
150 /* Example warning and error output */
152 ACPI_INFO ((AE_INFO, "Example ACPICA info message"));
153 ACPI_WARNING ((AE_INFO, "Example ACPICA warning message"));
154 ACPI_ERROR ((AE_INFO, "Example ACPICA error message"));
155 ACPI_EXCEPTION ((AE_INFO, AE_AML_OPERAND_TYPE,
156 "Example ACPICA exception message"));
164 /******************************************************************************
166 * Example ACPICA initialization code. This shows a full initialization with
167 * no early ACPI table access.
169 *****************************************************************************/
172 InitializeFullAcpica (void)
177 /* Initialize the ACPICA subsystem */
179 AcpiGbl_OverrideDefaultRegionHandlers = TRUE;
180 Status = AcpiInitializeSubsystem ();
181 if (ACPI_FAILURE (Status))
183 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing ACPICA"));
187 /* Initialize the ACPICA Table Manager and get all ACPI tables */
189 ACPI_INFO ((AE_INFO, "Loading ACPI tables"));
191 Status = AcpiInitializeTables (NULL, 16, FALSE);
192 if (ACPI_FAILURE (Status))
194 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing Table Manager"));
198 /* Install local handlers */
200 Status = InstallHandlers ();
201 if (ACPI_FAILURE (Status))
203 ACPI_EXCEPTION ((AE_INFO, Status, "While installing handlers"));
207 /* Initialize the ACPI hardware */
209 Status = AcpiEnableSubsystem (ACPI_FULL_INITIALIZATION);
210 if (ACPI_FAILURE (Status))
212 ACPI_EXCEPTION ((AE_INFO, Status, "While enabling ACPICA"));
216 /* Create the ACPI namespace from ACPI tables */
218 Status = AcpiLoadTables ();
219 if (ACPI_FAILURE (Status))
221 ACPI_EXCEPTION ((AE_INFO, Status, "While loading ACPI tables"));
225 /* Complete the ACPI namespace object initialization */
227 Status = AcpiInitializeObjects (ACPI_FULL_INITIALIZATION);
228 if (ACPI_FAILURE (Status))
230 ACPI_EXCEPTION ((AE_INFO, Status, "While initializing ACPICA objects"));
238 /******************************************************************************
240 * Example ACPICA initialization code with early ACPI table access. This shows
241 * an initialization that requires early access to ACPI tables (before
242 * kernel dynamic memory is available)
244 *****************************************************************************/
247 * The purpose of this static table array is to avoid the use of kernel
248 * dynamic memory which may not be available during early ACPI table
251 #define ACPI_MAX_INIT_TABLES 16
252 static ACPI_TABLE_DESC TableArray[ACPI_MAX_INIT_TABLES];
256 * This function would be called early in kernel initialization. After this
257 * is called, all ACPI tables are available to the host.
260 InitializeAcpiTables (
266 /* Initialize the ACPICA Table Manager and get all ACPI tables */
268 Status = AcpiInitializeTables (TableArray, ACPI_MAX_INIT_TABLES, TRUE);
274 * This function would be called after the kernel is initialized and
275 * dynamic/virtual memory is available. It completes the initialization of
276 * the ACPICA subsystem.
285 /* Initialize the ACPICA subsystem */
287 AcpiGbl_OverrideDefaultRegionHandlers = TRUE;
288 Status = AcpiInitializeSubsystem ();
289 if (ACPI_FAILURE (Status))
294 /* Copy the root table list to dynamic memory */
296 Status = AcpiReallocateRootTable ();
297 if (ACPI_FAILURE (Status))
302 /* Install local handlers */
304 Status = InstallHandlers ();
305 if (ACPI_FAILURE (Status))
307 ACPI_EXCEPTION ((AE_INFO, Status, "While installing handlers"));
311 /* Initialize the ACPI hardware */
313 Status = AcpiEnableSubsystem (ACPI_FULL_INITIALIZATION);
314 if (ACPI_FAILURE (Status))
319 /* Create the ACPI namespace from ACPI tables */
321 Status = AcpiLoadTables ();
322 if (ACPI_FAILURE (Status))
327 /* Complete the ACPI namespace object initialization */
329 Status = AcpiInitializeObjects (ACPI_FULL_INITIALIZATION);
330 if (ACPI_FAILURE (Status))
339 /******************************************************************************
341 * Example ACPICA handler and handler installation
343 *****************************************************************************/
352 ACPI_INFO ((AE_INFO, "Received a notify 0x%X", Value));
358 ACPI_HANDLE RegionHandle,
360 void *HandlerContext,
361 void **RegionContext)
364 if (Function == ACPI_REGION_DEACTIVATE)
366 *RegionContext = NULL;
370 *RegionContext = RegionHandle;
380 ACPI_PHYSICAL_ADDRESS Address,
383 void *HandlerContext,
387 ACPI_INFO ((AE_INFO, "Received a region access"));
394 InstallHandlers (void)
399 /* Install global notify handler */
401 Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT,
402 ACPI_SYSTEM_NOTIFY, NotifyHandler, NULL);
403 if (ACPI_FAILURE (Status))
405 ACPI_EXCEPTION ((AE_INFO, Status, "While installing Notify handler"));
409 Status = AcpiInstallAddressSpaceHandler (ACPI_ROOT_OBJECT,
410 ACPI_ADR_SPACE_SYSTEM_MEMORY, RegionHandler, RegionInit, NULL);
411 if (ACPI_FAILURE (Status))
413 ACPI_EXCEPTION ((AE_INFO, Status, "While installing an OpRegion handler"));
421 /******************************************************************************
423 * Examples of control method execution.
425 * _OSI is a predefined method that is implemented internally within ACPICA.
427 * Shows the following elements:
429 * 1) How to setup a control method argument and argument list
430 * 2) How to setup the return value object
431 * 3) How to invoke AcpiEvaluateObject
432 * 4) How to check the returned ACPI_STATUS
433 * 5) How to analyze the return value
435 *****************************************************************************/
441 ACPI_OBJECT_LIST ArgList;
443 ACPI_BUFFER ReturnValue;
447 ACPI_INFO ((AE_INFO, "Executing _OSI reserved method"));
449 /* Setup input argument */
452 ArgList.Pointer = Arg;
454 Arg[0].Type = ACPI_TYPE_STRING;
455 Arg[0].String.Pointer = "Windows 2001";
456 Arg[0].String.Length = strlen (Arg[0].String.Pointer);
458 /* Ask ACPICA to allocate space for the return object */
460 ReturnValue.Length = ACPI_ALLOCATE_BUFFER;
462 Status = AcpiEvaluateObject (NULL, "\\_OSI", &ArgList, &ReturnValue);
463 if (ACPI_FAILURE (Status))
465 ACPI_EXCEPTION ((AE_INFO, Status, "While executing _OSI"));
469 /* Ensure that the return object is large enough */
471 if (ReturnValue.Length < sizeof (ACPI_OBJECT))
473 AcpiOsPrintf ("Return value from _OSI method too small, %.8X\n",
478 /* Expect an integer return value from execution of _OSI */
480 Object = ReturnValue.Pointer;
481 if (Object->Type != ACPI_TYPE_INTEGER)
483 AcpiOsPrintf ("Invalid return type from _OSI, %.2X\n", Object->Type);
486 ACPI_INFO ((AE_INFO, "_OSI returned 0x%8.8X",
487 (UINT32) Object->Integer.Value));
492 /* Free a buffer created via ACPI_ALLOCATE_BUFFER */
494 AcpiOsFree (ReturnValue.Pointer);
498 /******************************************************************************
500 * Execute an actual control method in the DSDT (MAIN)
502 *****************************************************************************/
508 ACPI_OBJECT_LIST ArgList;
510 ACPI_BUFFER ReturnValue;
514 ACPI_INFO ((AE_INFO, "Executing MAIN method"));
516 /* Setup input argument */
519 ArgList.Pointer = Arg;
521 Arg[0].Type = ACPI_TYPE_STRING;
522 Arg[0].String.Pointer = "Method [MAIN] is executing";
523 Arg[0].String.Length = strlen (Arg[0].String.Pointer);
525 /* Ask ACPICA to allocate space for the return object */
527 ReturnValue.Length = ACPI_ALLOCATE_BUFFER;
529 Status = AcpiEvaluateObject (NULL, "\\MAIN", &ArgList, &ReturnValue);
530 if (ACPI_FAILURE (Status))
532 ACPI_EXCEPTION ((AE_INFO, Status, "While executing MAIN"));
536 if (ReturnValue.Pointer)
538 /* Obtain and validate the returned ACPI_OBJECT */
540 Object = ReturnValue.Pointer;
541 if (Object->Type == ACPI_TYPE_STRING)
543 AcpiOsPrintf ("Method [MAIN] returned: \"%s\"\n",
544 Object->String.Pointer);
547 ACPI_FREE (ReturnValue.Pointer);