• Bjorn Helgaas's avatar
    [IA64] add driver for ACPI methods to call native firmware · 28eda5b8
    Bjorn Helgaas authored
    This driver for HPQ5001 devices installs a global ACPI OpRegion handler.
    AML methods can use this OpRegion to call native firmware entry points.
    
    ACPI does not define a mechanism for AML methods to call native firmware
    interfaces such as PAL or SAL.  This OpRegion handler adds such a mechanism.
    After the handler is installed, an AML method can call native firmware by
    storing the arguments and firmware entry point to specific offsets in the
    OpRegion.  When AML reads the "return value" offset from the OpRegion, this
    handler loads up the arguments, makes the firmware call, and returns the
    result.
    Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
    28eda5b8
Kconfig 15.1 KB