https://github.com/torvalds/linux
Revision 83e68189745ad931c2afd45d8ee3303929233e7f authored by Matt Fleming on 14 November 2012, 09:42:35 UTC, committed by H. Peter Anvin on 30 January 2013, 19:51:59 UTC
Originally 'efi_enabled' indicated whether a kernel was booted from
EFI firmware. Over time its semantics have changed, and it now
indicates whether or not we are booted on an EFI machine with
bit-native firmware, e.g. 64-bit kernel with 64-bit firmware.
The immediate motivation for this patch is the bug report at,
https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557
which details how running a platform driver on an EFI machine that is
designed to run under BIOS can cause the machine to become
bricked. Also, the following report,
https://bugzilla.kernel.org/show_bug.cgi?id=47121
details how running said driver can also cause Machine Check
Exceptions. Drivers need a new means of detecting whether they're
running on an EFI machine, as sadly the expression,
if (!efi_enabled)
hasn't been a sufficient condition for quite some time.
Users actually want to query 'efi_enabled' for different reasons -
what they really want access to is the list of available EFI
facilities.
For instance, the x86 reboot code needs to know whether it can invoke
the ResetSystem() function provided by the EFI runtime services, while
the ACPI OSL code wants to know whether the EFI config tables were
mapped successfully. There are also checks in some of the platform
driver code to simply see if they're running on an EFI machine (which
would make it a bad idea to do BIOS-y things).
This patch is a prereq for the samsung-laptop fix patch.
Cc: David Airlie <airlied@linux.ie>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Peter Jones <pjones@redhat.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Steve Langasek <steve.langasek@canonical.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
1 parent f44310b
Tip revision: 83e68189745ad931c2afd45d8ee3303929233e7f authored by Matt Fleming on 14 November 2012, 09:42:35 UTC
efi: Make 'efi_enabled' a function to query EFI facilities
efi: Make 'efi_enabled' a function to query EFI facilities
Tip revision: 83e6818
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/*****************************************************************************
*
* whiteheat.h -- ConnectTech WhiteHEAT Firmware.
*
* Copyright (C) 2000-2002 ConnectTech Inc (http://www.connecttech.com/)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* (10/09/2002) Stuart MacDonald
* Firmware 4.06
*
* (04/09/2000) gkh
* Updated the firmware with the latest provided by ConnectTech.
*
* (01/16/2000) gkh
* Fixed my intel hex processing tool, so now the firmware actually
* matches the original file (this was causing a few problems...)
*
* (01/15/2000) gkh
* Added debug loader firmware if DEBUG is #defined:
* Port 1 LED flashes when the vend_ax program is running
* Port 2 LED flashes when any SETUP command arrives
* Port 3 LED flashes when any valid VENDOR request occurs
* Port 4 LED flashes when the EXTERNAL RAM DOWNLOAD request occurs
*
* version 1.0 (01/09/2000) gkh
* Original firmware from ConnectTech massaged a little to be program
* readable.
*
*****************************************************************************/
#define whiteheat_DATE "20000106"
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