From: "Luis R. Rodriguez" <mcg...@kernel.org> 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.
Change-Id: I85ba7dfb405c7faefc0f8e6b43a6e7260a27a1c9 Signed-off-by: Luis R. Rodriguez <mcg...@kernel.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: andrew.coop...@citrix.com Cc: andriy.shevche...@linux.intel.com Cc: bige...@linutronix.de Cc: boris.ostrov...@oracle.com Cc: david.vra...@citrix.com Cc: ffaine...@freebox.fr Cc: george.dun...@citrix.com Cc: g...@suse.com Cc: jgr...@suse.com Cc: j...@suse.com Cc: j...@joshtriplett.org Cc: julien.gr...@linaro.org Cc: konrad.w...@oracle.com Cc: kozer...@parallels.com Cc: l...@kernel.org Cc: lgu...@lists.ozlabs.org Cc: linux-a...@vger.kernel.org Cc: lv.zh...@intel.com Cc: m...@codeblueprint.co.uk Cc: mbi...@freebox.fr Cc: r...@rjwysocki.net Cc: robert.mo...@intel.com Cc: ru...@rustcorp.com.au Cc: ti...@suse.de Cc: toshi.k...@hp.com Cc: xen-de...@lists.xensource.com Link: http://lkml.kernel.org/r/1460592286-300-13-git-send-email-mcg...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/kernel/acpi/boot.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 8816102..7a25121 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -936,6 +936,10 @@ 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.header.revision >= FADT2_REVISION_ID && !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) && -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
