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[PATCH v6 12/16] x86, ACPI: parse ACPI_FADT_LEGACY_DEVICES

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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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[PATCH v6 00/16] x86: remove paravirt_enabled() "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 06/16] x86/init: use a platform legacy quirk for ebda "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 12/16] x86, ACPI: parse ACPI_FADT_LEGACY_DEVICES "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 11/16] pnpbios: replace paravirt_enabled() check with legacy device check "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 08/16] apm32: remove paravirt_enabled() use "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 07/16] tools/lguest: force disable tboot and apm "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 03/16] tools/lguest: make lguest launcher use X86_SUBARCH_LGUEST explicitly "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 01/16] x86/boot: enumerate documentation for the x86 hardware_subarch "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 16/16] x86/init: disable pnpbios and rtc for X86_SUBARCH_CE4100 "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 10/16] x86/cpu/intel: remove not needed paravirt_enabled() for f00f work around "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 14/16] x86/paravirt: remove paravirt_enabled() "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 15/16] x86/init: disable pnpbios for X86_SUBARCH_INTEL_MID "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 13/16] x86/init: rename ebda code file "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
  [PATCH v6 04/16] x86/rtc: replace paravirt rtc check with platform legacy quirk "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:10 +0200
    Re: [PATCH v6 04/16] x86/rtc: replace paravirt rtc check with  platform legacy quirk Juergen Gross <jgross@suse.com> - 2016-04-14 06:30 +0200
  [PATCH v6 07/16] tools/lguest: force disable tboot and apm "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:20 +0200
  [PATCH v6 05/16] x86, ACPI: move ACPI_FADT_NO_CMOS_RTC check to ACPI boot code "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:20 +0200
  [PATCH v6 12/16] x86, ACPI: parse ACPI_FADT_LEGACY_DEVICES "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-04-14 02:20 +0200

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