The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpica_support.c

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    1 /*-
    2  * Copyright (c) 2001 Mitsuru IWASAKI
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/dev/acpica/acpica_support.c 99682 2002-07-09 17:54:02Z iwasaki $
   27  */
   28 
   29 #include "acpi.h"
   30 #include <machine/cpufunc.h>
   31 #include <dev/acpica/acpica_support.h>
   32 
   33 ACPI_MODULE_NAME("SUPPORT")
   34 
   35 /*
   36  * Implement support code temporary here until officially merged into
   37  * Intel ACPI CA release.
   38  */
   39 
   40 #undef _COMPONENT
   41 #define _COMPONENT      ACPI_HARDWARE
   42 
   43 /******************************************************************************
   44  *
   45  * FUNCTION:    AcpiEnterSleepStateS4Bios
   46  *
   47  * PARAMETERS:  None
   48  *
   49  * RETURN:      Status
   50  *
   51  * DESCRIPTION: Enter a system sleep state S4BIOS
   52  *
   53  ******************************************************************************/
   54         
   55 ACPI_STATUS
   56 AcpiEnterSleepStateS4Bios (
   57     void)
   58 {
   59     ACPI_OBJECT_LIST    ArgList;
   60     ACPI_OBJECT         Arg;
   61     UINT32              Value;
   62 
   63 
   64     ACPI_FUNCTION_TRACE ("AcpiEnterSleepStateS4Bios");
   65 
   66     /* run the _PTS and _GTS methods */
   67 
   68     ACPI_MEMSET(&ArgList, 0, sizeof(ArgList));
   69     ArgList.Count = 1;
   70     ArgList.Pointer = &Arg;
   71 
   72     ACPI_MEMSET(&Arg, 0, sizeof(Arg));
   73     Arg.Type = ACPI_TYPE_INTEGER;
   74     Arg.Integer.Value = ACPI_STATE_S4;
   75 
   76     AcpiEvaluateObject (NULL, "\\_PTS", &ArgList, NULL);
   77     AcpiEvaluateObject (NULL, "\\_GTS", &ArgList, NULL);
   78 
   79     /* clear wake status */
   80 
   81     AcpiSetRegister (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_LOCK);
   82 
   83     ACPI_DISABLE_IRQS ();
   84 
   85     AcpiHwDisableNonWakeupGpes();
   86 
   87     /* flush caches */
   88 
   89     ACPI_FLUSH_CPU_CACHE ();
   90 
   91     /* write the value to command port and wait until we enter sleep state */
   92     do
   93     {
   94         AcpiOsStall(1000000);
   95         AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->S4BiosReq, 8);
   96         AcpiGetRegister (ACPI_BITREG_WAKE_STATUS, &Value, ACPI_MTX_LOCK);
   97     }
   98     while (!Value);
   99 
  100     AcpiHwEnableNonWakeupGpes();
  101 
  102     ACPI_ENABLE_IRQS ();
  103 
  104     return_ACPI_STATUS (AE_OK);
  105 }
  106 

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