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  • flone_saSeptember 15, 2009 2:44 AM PDT   
    Invoke ACPI methods
    Hello,

    I'm currently trying to understand at least a minimum how ACPI works. After unsuccessful googling about how to invoke ACPI methods, i'm begging some help here.

    So, here are my wonderings :
    1. Are the ACPI registers (i.e PM1a_CNT) all accessible via PIO ? If there are some in MMIO? In that case, how can i know if they can be accessed via MMIO or PIO ?
    2. How can i call an ACPI method (like _OSI for example) ? Has anyone a C sample program with the invocation of an ACPI method ?
    3. Do you have any references (easy to understand) that i can read to implement a driver that uses ACPI ?

    Thanks a lot.

    Fernand

    Gina Harris (Intel)October 26, 2009 12:08 PM PDT
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    		 #1
    Re: Invoke ACPI methods
    Quoting - flone_sa
    Hello,

    I'm currently trying to understand at least a minimum how ACPI works. After unsuccessful googling about how to invoke ACPI methods, i'm begging some help here.

    So, here are my wonderings :
    1. Are the ACPI registers (i.e PM1a_CNT) all accessible via PIO ? If there are some in MMIO? In that case, how can i know if they can be accessed via MMIO or PIO ?
    2. How can i call an ACPI method (like _OSI for example) ? Has anyone a C sample program with the invocation of an ACPI method ?
    3. Do you have any references (easy to understand) that i can read to implement a driver that uses ACPI ?

    Thanks a lot.

    Fernand

    Hello Fernand,

    There is some ACPI information on www.intel.com at http://www.intel.com/technology/iapc/acpi/. This page in turn leads to the ACPI web site, where you may be able to find more information.

    Regards,

    Gina H.
    Intel(R) Software Network Support


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