ACPI: add config for BIOS table scan
With the addition of ARM64 that does not have a traditional BIOS to scan, add a config option which is selected on x86 (ia64 doesn't need it either, it is EFI/UEFI based system) to do the traditional BIOS scanning for tables. Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -132,6 +132,7 @@ config X86
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select GENERIC_CPU_AUTOPROBE
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select HAVE_ARCH_AUDITSYSCALL
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select ARCH_SUPPORTS_ATOMIC_RMW
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select ACPI_LEGACY_TABLES_LOOKUP if ACPI
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config INSTRUCTION_DECODER
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def_bool y
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@ -42,6 +42,9 @@ menuconfig ACPI
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if ACPI
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config ACPI_LEGACY_TABLES_LOOKUP
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bool
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config ACPI_SLEEP
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bool
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depends on SUSPEND || HIBERNATION
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@ -259,12 +259,14 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
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"System description tables not found\n");
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return 0;
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}
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} else {
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} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
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acpi_physical_address pa = 0;
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acpi_find_root_pointer(&pa);
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return pa;
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}
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return 0;
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}
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/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
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