Messages in this thread Patch in this message | | | Date | Fri, 22 Apr 2016 02:53:24 -0700 | From | "tip-bot for Luis R. Rodriguez" <> | Subject | [tip:x86/boot] x86/ACPI: Parse ACPI_FADT_LEGACY_DEVICES |
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Commit-ID: 7a17b82ccd6671a4bb436df52eedeff906b02735 Gitweb: http://git.kernel.org/tip/7a17b82ccd6671a4bb436df52eedeff906b02735 Author: Luis R. Rodriguez <mcgrof@kernel.org> AuthorDate: Wed, 13 Apr 2016 17:04:42 -0700 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Fri, 22 Apr 2016 10:29:06 +0200
x86/ACPI: Parse ACPI_FADT_LEGACY_DEVICES
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> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andrew.cooper3@citrix.com Cc: andriy.shevchenko@linux.intel.com Cc: bigeasy@linutronix.de Cc: boris.ostrovsky@oracle.com Cc: david.vrabel@citrix.com Cc: ffainelli@freebox.fr Cc: george.dunlap@citrix.com Cc: glin@suse.com Cc: jgross@suse.com Cc: jlee@suse.com Cc: josh@joshtriplett.org Cc: julien.grall@linaro.org Cc: konrad.wilk@oracle.com Cc: kozerkov@parallels.com Cc: lenb@kernel.org Cc: lguest@lists.ozlabs.org Cc: linux-acpi@vger.kernel.org Cc: lv.zheng@intel.com Cc: matt@codeblueprint.co.uk Cc: mbizon@freebox.fr Cc: rjw@rjwysocki.net Cc: robert.moore@intel.com Cc: rusty@rustcorp.com.au Cc: tiwai@suse.de Cc: toshi.kani@hp.com Cc: xen-devel@lists.xensource.com Link: http://lkml.kernel.org/r/1460592286-300-13-git-send-email-mcgrof@kernel.org Signed-off-by: Ingo Molnar <mingo@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 8c9c2bd..c9a06e5 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;
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