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    Subject[PATCH v6 12/16] x86, ACPI: parse ACPI_FADT_LEGACY_DEVICES
    Date
    ACPI 5.2.9.3 IA-PC Boot Architecture flag ACPI_FADT_LEGACY_DEVICES
    can be used to determine if a system has legacy devices LPC or
    ISA devices. The x86 platform already has a struct which lists
    known associated legacy devices, we start off careful only
    by disabling root devices we should not regress with. The struct
    and device list can be expanded with time to cover more root
    legacy components.

    Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
    ---
    arch/x86/kernel/acpi/boot.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
    index 8c9c2bdba092..c9a06e573fa5 100644
    --- a/arch/x86/kernel/acpi/boot.c
    +++ b/arch/x86/kernel/acpi/boot.c
    @@ -913,6 +913,11 @@ late_initcall(hpet_insert_resource);

    static int __init acpi_parse_fadt(struct acpi_table_header *table)
    {
    + if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
    + pr_debug("ACPI: no legacy devices present\n");
    + x86_platform.legacy.devices.pnpbios = 0;
    + }
    +
    if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
    pr_debug("ACPI: not registering RTC platform device\n");
    x86_platform.legacy.rtc = 0;
    --
    2.7.2
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