Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2428 insertions, 0 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
new file mode 100644
index 000000000000..45641a872550
--- /dev/null
+++ b/arch/i386/kernel/apm.c
@@ -0,0 +1,2428 @@
+/* -*- linux-c -*-
+ * APM BIOS driver for Linux
+ * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
+ *
+ * Initial development of this driver was funded by NEC Australia P/L
+ *	and NEC Corporation
+ *
+ * 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, 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.
+ *
+ * October 1995, Rik Faith (faith@cs.unc.edu):
+ *    Minor enhancements and updates (to the patch set) for 1.3.x
+ *    Documentation
+ * January 1996, Rik Faith (faith@cs.unc.edu):
+ *    Make /proc/apm easy to format (bump driver version)
+ * March 1996, Rik Faith (faith@cs.unc.edu):
+ *    Prohibit APM BIOS calls unless apm_enabled.
+ *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
+ * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
+ *    Version 1.0 and 1.1
+ * May 1996, Version 1.2
+ * Feb 1998, Version 1.3
+ * Feb 1998, Version 1.4
+ * Aug 1998, Version 1.5
+ * Sep 1998, Version 1.6
+ * Nov 1998, Version 1.7
+ * Jan 1999, Version 1.8
+ * Jan 1999, Version 1.9
+ * Oct 1999, Version 1.10
+ * Nov 1999, Version 1.11
+ * Jan 2000, Version 1.12
+ * Feb 2000, Version 1.13
+ * Nov 2000, Version 1.14
+ * Oct 2001, Version 1.15
+ * Jan 2002, Version 1.16
+ * Oct 2002, Version 1.16ac
+ *
+ * History:
+ *    0.6b: first version in official kernel, Linux 1.3.46
+ *    0.7: changed /proc/apm format, Linux 1.3.58
+ *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
+ *    0.9: only call bios if bios is present, Linux 1.3.72
+ *    1.0: use fixed device number, consolidate /proc/apm into this file,
+ *         Linux 1.3.85
+ *    1.1: support user-space standby and suspend, power off after system
+ *         halted, Linux 1.3.98
+ *    1.2: When resetting RTC after resume, take care so that the time
+ *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
+ *         <jtoth@princeton.edu>); improve interaction between
+ *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
+ *    1.2a:Simple change to stop mysterious bug reports with SMP also added
+ *	   levels to the printk calls. APM is not defined for SMP machines.
+ *         The new replacment for it is, but Linux doesn't yet support this.
+ *         Alan Cox Linux 2.1.55
+ *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
+ *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
+ *         Dean Gaudet <dgaudet@arctic.org>.
+ *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
+ *    1.5: Fix segment register reloading (in case of bad segments saved
+ *         across BIOS call).
+ *         Stephen Rothwell
+ *    1.6: Cope with complier/assembler differences.
+ *         Only try to turn off the first display device.
+ *         Fix OOPS at power off with no APM BIOS by Jan Echternach
+ *                   <echter@informatik.uni-rostock.de>
+ *         Stephen Rothwell
+ *    1.7: Modify driver's cached copy of the disabled/disengaged flags
+ *         to reflect current state of APM BIOS.
+ *         Chris Rankin <rankinc@bellsouth.net>
+ *         Reset interrupt 0 timer to 100Hz after suspend
+ *         Chad Miller <cmiller@surfsouth.com>
+ *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
+ *         Richard Gooch <rgooch@atnf.csiro.au>
+ *         Allow boot time disabling of APM
+ *         Make boot messages far less verbose by default
+ *         Make asm safer
+ *         Stephen Rothwell
+ *    1.8: Add CONFIG_APM_RTC_IS_GMT
+ *         Richard Gooch <rgooch@atnf.csiro.au>
+ *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
+ *         remove dependency on CONFIG_PROC_FS
+ *         Stephen Rothwell
+ *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
+ *         Try to cope with BIOS's that need to have all display
+ *         devices blanked and not just the first one.
+ *         Ross Paterson <ross@soi.city.ac.uk>
+ *         Fix segment limit setting it has always been wrong as
+ *         the segments needed to have byte granularity.
+ *         Mark a few things __init.
+ *         Add hack to allow power off of SMP systems by popular request.
+ *         Use CONFIG_SMP instead of __SMP__
+ *         Ignore BOUNCES for three seconds.
+ *         Stephen Rothwell
+ *   1.10: Fix for Thinkpad return code.
+ *         Merge 2.2 and 2.3 drivers.
+ *         Remove APM dependencies in arch/i386/kernel/process.c
+ *         Remove APM dependencies in drivers/char/sysrq.c
+ *         Reset time across standby.
+ *         Allow more inititialisation on SMP.
+ *         Remove CONFIG_APM_POWER_OFF and make it boot time
+ *         configurable (default on).
+ *         Make debug only a boot time parameter (remove APM_DEBUG).
+ *         Try to blank all devices on any error.
+ *   1.11: Remove APM dependencies in drivers/char/console.c
+ *         Check nr_running to detect if we are idle (from
+ *         Borislav Deianov <borislav@lix.polytechnique.fr>)
+ *         Fix for bioses that don't zero the top part of the
+ *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
+ *         (reported by Panos Katsaloulis <teras@writeme.com>).
+ *         Real mode power off patch (Walter Hofmann
+ *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
+ *   1.12: Remove CONFIG_SMP as the compiler will optimize
+ *         the code away anyway (smp_num_cpus == 1 in UP)
+ *         noted by Artur Skawina <skawina@geocities.com>.
+ *         Make power off under SMP work again.
+ *         Fix thinko with initial engaging of BIOS.
+ *         Make sure power off only happens on CPU 0
+ *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
+ *         Do error notification to user mode if BIOS calls fail.
+ *         Move entrypoint offset fix to ...boot/setup.S
+ *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
+ *         Remove smp-power-off. SMP users must now specify
+ *         "apm=power-off" on the kernel command line. Suggested
+ *         by Jim Avera <jima@hal.com>, modified by Alan Cox
+ *         <alan@lxorguk.ukuu.org.uk>.
+ *         Register the /proc/apm entry even on SMP so that
+ *         scripts that check for it before doing power off
+ *         work (Jim Avera <jima@hal.com>).
+ *   1.13: Changes for new pm_ interfaces (Andy Henroid
+ *         <andy_henroid@yahoo.com>).
+ *         Modularize the code.
+ *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
+ *         is now the way life works).
+ *         Fix thinko in suspend() (wrong return).
+ *         Notify drivers on critical suspend.
+ *         Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
+ *         modified by sfr).
+ *         Disable interrupts while we are suspended (Andy Henroid
+ *         <andy_henroid@yahoo.com> fixed by sfr).
+ *         Make power off work on SMP again (Tony Hoyle
+ *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
+ *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
+ *         interval is now configurable.
+ *   1.14: Make connection version persist across module unload/load.
+ *         Enable and engage power management earlier.
+ *         Disengage power management on module unload.
+ *         Changed to use the sysrq-register hack for registering the
+ *         power off function called by magic sysrq based upon discussions
+ *         in irc://irc.openprojects.net/#kernelnewbies
+ *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
+ *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
+ *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
+ *         Work around byte swap bug in one of the Vaio's BIOS's
+ *         (Marc Boucher <marc@mbsi.ca>).
+ *         Exposed the disable flag to dmi so that we can handle known
+ *         broken APM (Alan Cox <alan@redhat.com>).
+ *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
+ *         calling it - instead idle. (Alan Cox <alan@redhat.com>)
+ *         If an APM idle fails log it and idle sensibly
+ *   1.15: Don't queue events to clients who open the device O_WRONLY.
+ *         Don't expect replies from clients who open the device O_RDONLY.
+ *         (Idea from Thomas Hood)
+ *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
+ *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
+ *         Notify listeners of standby or suspend events before notifying
+ *         drivers. Return EBUSY to ioctl() if suspend is rejected.
+ *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
+ *         Ignore first resume after we generate our own resume event
+ *         after a suspend (Thomas Hood)
+ *         Daemonize now gets rid of our controlling terminal (sfr).
+ *         CONFIG_APM_CPU_IDLE now just affects the default value of
+ *         idle_threshold (sfr).
+ *         Change name of kernel apm daemon (as it no longer idles) (sfr).
+ *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
+ *	   make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
+ *	   TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
+ *
+ * APM 1.1 Reference:
+ *
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
+ *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
+ *
+ * [This document is available free from Intel by calling 800.628.8686 (fax
+ * 916.356.6100) or 800.548.4725; or via anonymous ftp from
+ * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc.  It is also
+ * available from Microsoft by calling 206.882.8080.]
+ *
+ * APM 1.2 Reference:
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
+ *
+ * [This document is available from Microsoft at:
+ *    http://www.microsoft.com/hwdev/busbios/amp_12.htm]
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/poll.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/timer.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+#include <linux/miscdevice.h>
+#include <linux/apm_bios.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/dmi.h>
+#include <linux/suspend.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/desc.h>
+
+#include "io_ports.h"
+
+extern spinlock_t i8253_lock;
+extern unsigned long get_cmos_time(void);
+extern void machine_real_restart(unsigned char *, int);
+
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+extern int (*console_blank_hook)(int);
+#endif
+
+/*
+ * The apm_bios device is one of the misc char devices.
+ * This is its minor number.
+ */
+#define	APM_MINOR_DEV	134
+
+/*
+ * See Documentation/Config.help for the configuration options.
+ *
+ * Various options can be changed at boot time as follows:
+ * (We allow underscores for compatibility with the modules code)
+ *	apm=on/off			enable/disable APM
+ *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
+ *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
+ *	    [no-]realmode[-_]power[-_]off	switch to real mode before
+ *	    					powering off
+ *	    [no-]debug			log some debugging messages
+ *	    [no-]power[-_]off		power off on shutdown
+ *	    [no-]smp			Use apm even on an SMP box
+ *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
+ *	    				bounces
+ *          idle[-_]threshold=<n>       System idle percentage above which to
+ *                                      make APM BIOS idle calls. Set it to
+ *                                      100 to disable.
+ *          idle[-_]period=<n>          Period (in 1/100s of a second) over
+ *                                      which the idle percentage is
+ *                                      calculated.
+ */
+
+/* KNOWN PROBLEM MACHINES:
+ *
+ * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
+ *                         [Confirmed by TI representative]
+ * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
+ *                    [Confirmed by BIOS disassembly]
+ *                    [This may work now ...]
+ * P: Toshiba 1950S: battery life information only gets updated after resume
+ * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
+ * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
+ * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
+ * 	Neale Banks <neale@lowendale.com.au> December 2000
+ *
+ * Legend: U = unusable with APM patches
+ *         P = partially usable with APM patches
+ */
+
+/*
+ * Define as 1 to make the driver always call the APM BIOS busy
+ * routine even if the clock was not reported as slowed by the
+ * idle routine.  Otherwise, define as 0.
+ */
+#define ALWAYS_CALL_BUSY   1
+
+/*
+ * Define to make the APM BIOS calls zero all data segment registers (so
+ * that an incorrect BIOS implementation will cause a kernel panic if it
+ * tries to write to arbitrary memory).
+ */
+#define APM_ZERO_SEGS
+
+#include "apm.h"
+
+/*
+ * Define to make all _set_limit calls use 64k limits.  The APM 1.1 BIOS is
+ * supposed to provide limit information that it recognizes.  Many machines
+ * do this correctly, but many others do not restrict themselves to their
+ * claimed limit.  When this happens, they will cause a segmentation
+ * violation in the kernel at boot time.  Most BIOS's, however, will
+ * respect a 64k limit, so we use that.  If you want to be pedantic and
+ * hold your BIOS to its claims, then undefine this.
+ */
+#define APM_RELAX_SEGMENTS
+
+/*
+ * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
+ * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
+ * David Chen <chen@ctpa04.mit.edu>
+ */
+#undef INIT_TIMER_AFTER_SUSPEND
+
+#ifdef INIT_TIMER_AFTER_SUSPEND
+#include <linux/timex.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#endif
+
+/*
+ * Need to poll the APM BIOS every second
+ */
+#define APM_CHECK_TIMEOUT	(HZ)
+
+/*
+ * Ignore suspend events for this amount of time after a resume
+ */
+#define DEFAULT_BOUNCE_INTERVAL		(3 * HZ)
+
+/*
+ * Maximum number of events stored
+ */
+#define APM_MAX_EVENTS		20
+
+/*
+ * The per-file APM data
+ */
+struct apm_user {
+	int		magic;
+	struct apm_user *	next;
+	int		suser: 1;
+	int		writer: 1;
+	int		reader: 1;
+	int		suspend_wait: 1;
+	int		suspend_result;
+	int		suspends_pending;
+	int		standbys_pending;
+	int		suspends_read;
+	int		standbys_read;
+	int		event_head;
+	int		event_tail;
+	apm_event_t	events[APM_MAX_EVENTS];
+};
+
+/*
+ * The magic number in apm_user
+ */
+#define APM_BIOS_MAGIC		0x4101
+
+/*
+ * idle percentage above which bios idle calls are done
+ */
+#ifdef CONFIG_APM_CPU_IDLE
+#define DEFAULT_IDLE_THRESHOLD	95
+#else
+#define DEFAULT_IDLE_THRESHOLD	100
+#endif
+#define DEFAULT_IDLE_PERIOD	(100 / 3)
+
+/*
+ * Local variables
+ */
+static struct {
+	unsigned long	offset;
+	unsigned short	segment;
+}				apm_bios_entry;
+static int			clock_slowed;
+static int			idle_threshold = DEFAULT_IDLE_THRESHOLD;
+static int			idle_period = DEFAULT_IDLE_PERIOD;
+static int			set_pm_idle;
+static int			suspends_pending;
+static int			standbys_pending;
+static int			ignore_sys_suspend;
+static int			ignore_normal_resume;
+static int			bounce_interval = DEFAULT_BOUNCE_INTERVAL;
+
+#ifdef CONFIG_APM_RTC_IS_GMT
+#	define	clock_cmos_diff	0
+#	define	got_clock_diff	1
+#else
+static long			clock_cmos_diff;
+static int			got_clock_diff;
+#endif
+static int			debug;
+static int			smp;
+static int			apm_disabled = -1;
+#ifdef CONFIG_SMP
+static int			power_off;
+#else
+static int			power_off = 1;
+#endif
+#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
+static int			realmode_power_off = 1;
+#else
+static int			realmode_power_off;
+#endif
+static int			exit_kapmd;
+static int			kapmd_running;
+#ifdef CONFIG_APM_ALLOW_INTS
+static int			allow_ints = 1;
+#else
+static int			allow_ints;
+#endif
+static int			broken_psr;
+
+static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
+static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
+static struct apm_user *	user_list;
+static DEFINE_SPINLOCK(user_list_lock);
+static struct desc_struct	bad_bios_desc = { 0, 0x00409200 };
+
+static char			driver_version[] = "1.16ac";	/* no spaces */
+
+/*
+ *	APM event names taken from the APM 1.2 specification. These are
+ *	the message codes that the BIOS uses to tell us about events
+ */
+static char *	apm_event_name[] = {
+	"system standby",
+	"system suspend",
+	"normal resume",
+	"critical resume",
+	"low battery",
+	"power status change",
+	"update time",
+	"critical suspend",
+	"user standby",
+	"user suspend",
+	"system standby resume",
+	"capabilities change"
+};
+#define NR_APM_EVENT_NAME	\
+		(sizeof(apm_event_name) / sizeof(apm_event_name[0]))
+
+typedef struct lookup_t {
+	int	key;
+	char *	msg;
+} lookup_t;
+
+/*
+ *	The BIOS returns a set of standard error codes in AX when the
+ *	carry flag is set.
+ */
+ 
+static const lookup_t error_table[] = {
+/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
+	{ APM_DISABLED,		"Power management disabled" },
+	{ APM_CONNECTED,	"Real mode interface already connected" },
+	{ APM_NOT_CONNECTED,	"Interface not connected" },
+	{ APM_16_CONNECTED,	"16 bit interface already connected" },
+/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
+	{ APM_32_CONNECTED,	"32 bit interface already connected" },
+	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
+	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
+	{ APM_BAD_PARAM,	"Parameter out of range" },
+	{ APM_NOT_ENGAGED,	"Interface not engaged" },
+	{ APM_BAD_FUNCTION,     "Function not supported" },
+	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
+	{ APM_BAD_STATE,	"Unable to enter requested state" },
+/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
+	{ APM_NO_ERROR,		"BIOS did not set a return code" },
+	{ APM_NOT_PRESENT,	"No APM present" }
+};
+#define ERROR_COUNT	(sizeof(error_table)/sizeof(lookup_t))
+
+/**
+ *	apm_error	-	display an APM error
+ *	@str: information string
+ *	@err: APM BIOS return code
+ *
+ *	Write a meaningful log entry to the kernel log in the event of
+ *	an APM error.
+ */
+ 
+static void apm_error(char *str, int err)
+{
+	int	i;
+
+	for (i = 0; i < ERROR_COUNT; i++)
+		if (error_table[i].key == err) break;
+	if (i < ERROR_COUNT)
+		printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
+	else
+		printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
+			str, err);
+}
+
+/*
+ * Lock APM functionality to physical CPU 0
+ */
+ 
+#ifdef CONFIG_SMP
+
+static cpumask_t apm_save_cpus(void)
+{
+	cpumask_t x = current->cpus_allowed;
+	/* Some bioses don't like being called from CPU != 0 */
+	set_cpus_allowed(current, cpumask_of_cpu(0));
+	BUG_ON(smp_processor_id() != 0);
+	return x;
+}
+
+static inline void apm_restore_cpus(cpumask_t mask)
+{
+	set_cpus_allowed(current, mask);
+}
+
+#else
+
+/*
+ *	No CPU lockdown needed on a uniprocessor
+ */
+ 
+#define apm_save_cpus()		(current->cpus_allowed)
+#define apm_restore_cpus(x)	(void)(x)
+
+#endif
+
+/*
+ * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
+ * apm_info.allow_ints, we are being really paranoid here!  Not only
+ * are interrupts disabled, but all the segment registers (except SS)
+ * are saved and zeroed this means that if the BIOS tries to reference
+ * any data without explicitly loading the segment registers, the kernel
+ * will fault immediately rather than have some unforeseen circumstances
+ * for the rest of the kernel.  And it will be very obvious!  :-) Doing
+ * this depends on CS referring to the same physical memory as DS so that
+ * DS can be zeroed before the call. Unfortunately, we can't do anything
+ * about the stack segment/pointer.  Also, we tell the compiler that
+ * everything could change.
+ *
+ * Also, we KNOW that for the non error case of apm_bios_call, there
+ * is no useful data returned in the low order 8 bits of eax.
+ */
+#define APM_DO_CLI	\
+	if (apm_info.allow_ints) \
+		local_irq_enable(); \
+	else \
+		local_irq_disable();
+
+#ifdef APM_ZERO_SEGS
+#	define APM_DECL_SEGS \
+		unsigned int saved_fs; unsigned int saved_gs;
+#	define APM_DO_SAVE_SEGS \
+		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
+#	define APM_DO_RESTORE_SEGS \
+		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
+#else
+#	define APM_DECL_SEGS
+#	define APM_DO_SAVE_SEGS
+#	define APM_DO_RESTORE_SEGS
+#endif
+
+/**
+ *	apm_bios_call	-	Make an APM BIOS 32bit call
+ *	@func: APM function to execute
+ *	@ebx_in: EBX register for call entry
+ *	@ecx_in: ECX register for call entry
+ *	@eax: EAX register return
+ *	@ebx: EBX register return
+ *	@ecx: ECX register return
+ *	@edx: EDX register return
+ *	@esi: ESI register return
+ *
+ *	Make an APM call using the 32bit protected mode interface. The
+ *	caller is responsible for knowing if APM BIOS is configured and
+ *	enabled. This call can disable interrupts for a long period of
+ *	time on some laptops.  The return value is in AH and the carry
+ *	flag is loaded into AL.  If there is an error, then the error
+ *	code is returned in AH (bits 8-15 of eax) and this function
+ *	returns non-zero.
+ */
+ 
+static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
+	u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
+{
+	APM_DECL_SEGS
+	unsigned long		flags;
+	cpumask_t		cpus;
+	int			cpu;
+	struct desc_struct	save_desc_40;
+
+	cpus = apm_save_cpus();
+	
+	cpu = get_cpu();
+	save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
+	per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+
+	local_save_flags(flags);
+	APM_DO_CLI;
+	APM_DO_SAVE_SEGS;
+	apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
+	APM_DO_RESTORE_SEGS;
+	local_irq_restore(flags);
+	per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = save_desc_40;
+	put_cpu();
+	apm_restore_cpus(cpus);
+	
+	return *eax & 0xff;
+}
+
+/**
+ *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
+ *	@func: APM function to invoke
+ *	@ebx_in: EBX register value for BIOS call
+ *	@ecx_in: ECX register value for BIOS call
+ *	@eax: EAX register on return from the BIOS call
+ *
+ *	Make a BIOS call that does only returns one value, or just status.
+ *	If there is an error, then the error code is returned in AH
+ *	(bits 8-15 of eax) and this function returns non-zero. This is
+ *	used for simpler BIOS operations. This call may hold interrupts
+ *	off for a long time on some laptops.
+ */
+
+static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
+{
+	u8			error;
+	APM_DECL_SEGS
+	unsigned long		flags;
+	cpumask_t		cpus;
+	int			cpu;
+	struct desc_struct	save_desc_40;
+
+
+	cpus = apm_save_cpus();
+	
+	cpu = get_cpu();
+	save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
+	per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+
+	local_save_flags(flags);
+	APM_DO_CLI;
+	APM_DO_SAVE_SEGS;
+	error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
+	APM_DO_RESTORE_SEGS;
+	local_irq_restore(flags);
+	__get_cpu_var(cpu_gdt_table)[0x40 / 8] = save_desc_40;
+	put_cpu();
+	apm_restore_cpus(cpus);
+	return error;
+}
+
+/**
+ *	apm_driver_version	-	APM driver version
+ *	@val:	loaded with the APM version on return
+ *
+ *	Retrieve the APM version supported by the BIOS. This is only
+ *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
+ *	probably present.
+ *
+ *	On entry val should point to a value indicating the APM driver
+ *	version with the high byte being the major and the low byte the
+ *	minor number both in BCD
+ *
+ *	On return it will hold the BIOS revision supported in the
+ *	same format.
+ */
+
+static int apm_driver_version(u_short *val)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
+		return (eax >> 8) & 0xff;
+	*val = eax;
+	return APM_SUCCESS;
+}
+
+/**
+ *	apm_get_event	-	get an APM event from the BIOS
+ *	@event: pointer to the event
+ *	@info: point to the event information
+ *
+ *	The APM BIOS provides a polled information for event
+ *	reporting. The BIOS expects to be polled at least every second
+ *	when events are pending. When a message is found the caller should
+ *	poll until no more messages are present.  However, this causes
+ *	problems on some laptops where a suspend event notification is
+ *	not cleared until it is acknowledged.
+ *
+ *	Additional information is returned in the info pointer, providing
+ *	that APM 1.2 is in use. If no messges are pending the value 0x80
+ *	is returned (No power management events pending).
+ */
+ 
+static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
+{
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	dummy;
+
+	if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
+			&dummy, &dummy))
+		return (eax >> 8) & 0xff;
+	*event = ebx;
+	if (apm_info.connection_version < 0x0102)
+		*info = ~0; /* indicate info not valid */
+	else
+		*info = ecx;
+	return APM_SUCCESS;
+}
+
+/**
+ *	set_power_state	-	set the power management state
+ *	@what: which items to transition
+ *	@state: state to transition to
+ *
+ *	Request an APM change of state for one or more system devices. The
+ *	processor state must be transitioned last of all. what holds the
+ *	class of device in the upper byte and the device number (0xFF for
+ *	all) for the object to be transitioned.
+ *
+ *	The state holds the state to transition to, which may in fact
+ *	be an acceptance of a BIOS requested state change.
+ */
+ 
+static int set_power_state(u_short what, u_short state)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
+		return (eax >> 8) & 0xff;
+	return APM_SUCCESS;
+}
+
+/**
+ *	set_system_power_state - set system wide power state
+ *	@state: which state to enter
+ *
+ *	Transition the entire system into a new APM power state.
+ */
+ 
+static int set_system_power_state(u_short state)
+{
+	return set_power_state(APM_DEVICE_ALL, state);
+}
+
+/**
+ *	apm_do_idle	-	perform power saving
+ *
+ *	This function notifies the BIOS that the processor is (in the view
+ *	of the OS) idle. It returns -1 in the event that the BIOS refuses
+ *	to handle the idle request. On a success the function returns 1
+ *	if the BIOS did clock slowing or 0 otherwise.
+ */
+ 
+static int apm_do_idle(void)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
+		static unsigned long t;
+
+		/* This always fails on some SMP boards running UP kernels.
+		 * Only report the failure the first 5 times.
+		 */
+		if (++t < 5)
+		{
+			printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
+					(eax >> 8) & 0xff);
+			t = jiffies;
+		}
+		return -1;
+	}
+	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
+	return clock_slowed;
+}
+
+/**
+ *	apm_do_busy	-	inform the BIOS the CPU is busy
+ *
+ *	Request that the BIOS brings the CPU back to full performance. 
+ */
+ 
+static void apm_do_busy(void)
+{
+	u32	dummy;
+
+	if (clock_slowed || ALWAYS_CALL_BUSY) {
+		(void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
+		clock_slowed = 0;
+	}
+}
+
+/*
+ * If no process has really been interested in
+ * the CPU for some time, we want to call BIOS
+ * power management - we probably want
+ * to conserve power.
+ */
+#define IDLE_CALC_LIMIT   (HZ * 100)
+#define IDLE_LEAKY_MAX    16
+
+static void (*original_pm_idle)(void);
+
+extern void default_idle(void);
+
+/**
+ * apm_cpu_idle		-	cpu idling for APM capable Linux
+ *
+ * This is the idling function the kernel executes when APM is available. It 
+ * tries to do BIOS powermanagement based on the average system idle time.
+ * Furthermore it calls the system default idle routine.
+ */
+
+static void apm_cpu_idle(void)
+{
+	static int use_apm_idle; /* = 0 */
+	static unsigned int last_jiffies; /* = 0 */
+	static unsigned int last_stime; /* = 0 */
+
+	int apm_idle_done = 0;
+	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
+	unsigned int bucket;
+
+recalc:
+	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
+		use_apm_idle = 0;
+		last_jiffies = jiffies;
+		last_stime = current->stime;
+	} else if (jiffies_since_last_check > idle_period) {
+		unsigned int idle_percentage;
+
+		idle_percentage = current->stime - last_stime;
+		idle_percentage *= 100;
+		idle_percentage /= jiffies_since_last_check;
+		use_apm_idle = (idle_percentage > idle_threshold);
+		if (apm_info.forbid_idle)
+			use_apm_idle = 0;
+		last_jiffies = jiffies;
+		last_stime = current->stime;
+	}
+
+	bucket = IDLE_LEAKY_MAX;
+
+	while (!need_resched()) {
+		if (use_apm_idle) {
+			unsigned int t;
+
+			t = jiffies;
+			switch (apm_do_idle()) {
+			case 0: apm_idle_done = 1;
+				if (t != jiffies) {
+					if (bucket) {
+						bucket = IDLE_LEAKY_MAX;
+						continue;
+					}
+				} else if (bucket) {
+					bucket--;
+					continue;
+				}
+				break;
+			case 1: apm_idle_done = 1;
+				break;
+			default: /* BIOS refused */
+				break;
+			}
+		}
+		if (original_pm_idle)
+			original_pm_idle();
+		else
+			default_idle();
+		jiffies_since_last_check = jiffies - last_jiffies;
+		if (jiffies_since_last_check > idle_period)
+			goto recalc;
+	}
+
+	if (apm_idle_done)
+		apm_do_busy();
+}
+
+/**
+ *	apm_power_off	-	ask the BIOS to power off
+ *
+ *	Handle the power off sequence. This is the one piece of code we
+ *	will execute even on SMP machines. In order to deal with BIOS
+ *	bugs we support real mode APM BIOS power off calls. We also make
+ *	the SMP call on CPU0 as some systems will only honour this call
+ *	on their first cpu.
+ */
+ 
+static void apm_power_off(void)
+{
+	unsigned char	po_bios_call[] = {
+		0xb8, 0x00, 0x10,	/* movw  $0x1000,ax  */
+		0x8e, 0xd0,		/* movw  ax,ss       */
+		0xbc, 0x00, 0xf0,	/* movw  $0xf000,sp  */
+		0xb8, 0x07, 0x53,	/* movw  $0x5307,ax  */
+		0xbb, 0x01, 0x00,	/* movw  $0x0001,bx  */
+		0xb9, 0x03, 0x00,	/* movw  $0x0003,cx  */
+		0xcd, 0x15		/* int   $0x15       */
+	};
+
+	/*
+	 * This may be called on an SMP machine.
+	 */
+#ifdef CONFIG_SMP
+	/* Some bioses don't like being called from CPU != 0 */
+	set_cpus_allowed(current, cpumask_of_cpu(0));
+	BUG_ON(smp_processor_id() != 0);
+#endif
+	if (apm_info.realmode_power_off)
+	{
+		(void)apm_save_cpus();
+		machine_real_restart(po_bios_call, sizeof(po_bios_call));
+	}
+	else
+		(void) set_system_power_state(APM_STATE_OFF);
+}
+
+#ifdef CONFIG_APM_DO_ENABLE
+
+/**
+ *	apm_enable_power_management - enable BIOS APM power management
+ *	@enable: enable yes/no
+ *
+ *	Enable or disable the APM BIOS power services. 
+ */
+ 
+static int apm_enable_power_management(int enable)
+{
+	u32	eax;
+
+	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
+		return APM_NOT_ENGAGED;
+	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
+			enable, &eax))
+		return (eax >> 8) & 0xff;
+	if (enable)
+		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
+	else
+		apm_info.bios.flags |= APM_BIOS_DISABLED;
+	return APM_SUCCESS;
+}
+#endif
+
+/**
+ *	apm_get_power_status	-	get current power state
+ *	@status: returned status
+ *	@bat: battery info
+ *	@life: estimated life
+ *
+ *	Obtain the current power status from the APM BIOS. We return a
+ *	status which gives the rough battery status, and current power
+ *	source. The bat value returned give an estimate as a percentage
+ *	of life and a status value for the battery. The estimated life
+ *	if reported is a lifetime in secodnds/minutes at current powwer
+ *	consumption.
+ */
+ 
+static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
+{
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	edx;
+	u32	dummy;
+
+	if (apm_info.get_power_status_broken)
+		return APM_32_UNSUPPORTED;
+	if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
+			&eax, &ebx, &ecx, &edx, &dummy))
+		return (eax >> 8) & 0xff;
+	*status = ebx;
+	*bat = ecx;
+	if (apm_info.get_power_status_swabinminutes) {
+		*life = swab16((u16)edx);
+		*life |= 0x8000;
+	} else
+		*life = edx;
+	return APM_SUCCESS;
+}
+
+#if 0
+static int apm_get_battery_status(u_short which, u_short *status,
+				  u_short *bat, u_short *life, u_short *nbat)
+{
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	edx;
+	u32	esi;
+
+	if (apm_info.connection_version < 0x0102) {
+		/* pretend we only have one battery. */
+		if (which != 1)
+			return APM_BAD_DEVICE;
+		*nbat = 1;
+		return apm_get_power_status(status, bat, life);
+	}
+
+	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
+			&ebx, &ecx, &edx, &esi))
+		return (eax >> 8) & 0xff;
+	*status = ebx;
+	*bat = ecx;
+	*life = edx;
+	*nbat = esi;
+	return APM_SUCCESS;
+}
+#endif
+
+/**
+ *	apm_engage_power_management	-	enable PM on a device
+ *	@device: identity of device
+ *	@enable: on/off
+ *
+ *	Activate or deactive power management on either a specific device
+ *	or the entire system (%APM_DEVICE_ALL).
+ */
+ 
+static int apm_engage_power_management(u_short device, int enable)
+{
+	u32	eax;
+
+	if ((enable == 0) && (device == APM_DEVICE_ALL)
+	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
+		return APM_DISABLED;
+	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
+		return (eax >> 8) & 0xff;
+	if (device == APM_DEVICE_ALL) {
+		if (enable)
+			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
+		else
+			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
+	}
+	return APM_SUCCESS;
+}
+
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+
+/**
+ *	apm_console_blank	-	blank the display
+ *	@blank: on/off
+ *
+ *	Attempt to blank the console, firstly by blanking just video device
+ *	zero, and if that fails (some BIOSes don't support it) then it blanks
+ *	all video devices. Typically the BIOS will do laptop backlight and
+ *	monitor powerdown for us.
+ */
+ 
+static int apm_console_blank(int blank)
+{
+	int	error;
+	u_short	state;
+
+	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
+	/* Blank the first display device */
+	error = set_power_state(0x100, state);
+	if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
+		/* try to blank them all instead */
+		error = set_power_state(0x1ff, state);
+		if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
+			/* try to blank device one instead */
+			error = set_power_state(0x101, state);
+	}
+	if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
+		return 1;
+	if (error == APM_NOT_ENGAGED) {
+		static int tried;
+		int eng_error;
+		if (tried++ == 0) {
+			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
+			if (eng_error) {
+				apm_error("set display", error);
+				apm_error("engage interface", eng_error);
+				return 0;
+			} else
+				return apm_console_blank(blank);
+		}
+	}
+	apm_error("set display", error);
+	return 0;
+}
+#endif
+
+static int queue_empty(struct apm_user *as)
+{
+	return as->event_head == as->event_tail;
+}
+
+static apm_event_t get_queued_event(struct apm_user *as)
+{
+	as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
+	return as->events[as->event_tail];
+}
+
+static void queue_event(apm_event_t event, struct apm_user *sender)
+{
+	struct apm_user *	as;
+
+	spin_lock(&user_list_lock);
+	if (user_list == NULL)
+		goto out;
+	for (as = user_list; as != NULL; as = as->next) {
+		if ((as == sender) || (!as->reader))
+			continue;
+		as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
+		if (as->event_head == as->event_tail) {
+			static int notified;
+
+			if (notified++ == 0)
+			    printk(KERN_ERR "apm: an event queue overflowed\n");
+			as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
+		}
+		as->events[as->event_head] = event;
+		if ((!as->suser) || (!as->writer))
+			continue;
+		switch (event) {
+		case APM_SYS_SUSPEND:
+		case APM_USER_SUSPEND:
+			as->suspends_pending++;
+			suspends_pending++;
+			break;
+
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+			as->standbys_pending++;
+			standbys_pending++;
+			break;
+		}
+	}
+	wake_up_interruptible(&apm_waitqueue);
+out:
+	spin_unlock(&user_list_lock);
+}
+
+static void set_time(void)
+{
+	if (got_clock_diff) {	/* Must know time zone in order to set clock */
+		xtime.tv_sec = get_cmos_time() + clock_cmos_diff;
+		xtime.tv_nsec = 0; 
+	} 
+}
+
+static void get_time_diff(void)
+{
+#ifndef CONFIG_APM_RTC_IS_GMT
+	/*
+	 * Estimate time zone so that set_time can update the clock
+	 */
+	clock_cmos_diff = -get_cmos_time();
+	clock_cmos_diff += get_seconds();
+	got_clock_diff = 1;
+#endif
+}
+
+static void reinit_timer(void)
+{
+#ifdef INIT_TIMER_AFTER_SUSPEND
+	unsigned long	flags;
+	extern spinlock_t i8253_lock;
+
+	spin_lock_irqsave(&i8253_lock, flags);
+	/* set the clock to 100 Hz */
+	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
+	udelay(10);
+	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
+	udelay(10);
+	outb(LATCH >> 8, PIT_CH0);	/* MSB */
+	udelay(10);
+	spin_unlock_irqrestore(&i8253_lock, flags);
+#endif
+}
+
+static int suspend(int vetoable)
+{
+	int		err;
+	struct apm_user	*as;
+
+	if (pm_send_all(PM_SUSPEND, (void *)3)) {
+		/* Vetoed */
+		if (vetoable) {
+			if (apm_info.connection_version > 0x100)
+				set_system_power_state(APM_STATE_REJECT);
+			err = -EBUSY;
+			ignore_sys_suspend = 0;
+			printk(KERN_WARNING "apm: suspend was vetoed.\n");
+			goto out;
+		}
+		printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
+	}
+
+	device_suspend(PMSG_SUSPEND);
+	local_irq_disable();
+	device_power_down(PMSG_SUSPEND);
+
+	/* serialize with the timer interrupt */
+	write_seqlock(&xtime_lock);
+
+	/* protect against access to timer chip registers */
+	spin_lock(&i8253_lock);
+
+	get_time_diff();
+	/*
+	 * Irq spinlock must be dropped around set_system_power_state.
+	 * We'll undo any timer changes due to interrupts below.
+	 */
+	spin_unlock(&i8253_lock);
+	write_sequnlock(&xtime_lock);
+	local_irq_enable();
+
+	save_processor_state();
+	err = set_system_power_state(APM_STATE_SUSPEND);
+	restore_processor_state();
+
+	local_irq_disable();
+	write_seqlock(&xtime_lock);
+	spin_lock(&i8253_lock);
+	reinit_timer();
+	set_time();
+	ignore_normal_resume = 1;
+
+	spin_unlock(&i8253_lock);
+	write_sequnlock(&xtime_lock);
+
+	if (err == APM_NO_ERROR)
+		err = APM_SUCCESS;
+	if (err != APM_SUCCESS)
+		apm_error("suspend", err);
+	err = (err == APM_SUCCESS) ? 0 : -EIO;
+	device_power_up();
+	local_irq_enable();
+	device_resume();
+	pm_send_all(PM_RESUME, (void *)0);
+	queue_event(APM_NORMAL_RESUME, NULL);
+ out:
+	spin_lock(&user_list_lock);
+	for (as = user_list; as != NULL; as = as->next) {
+		as->suspend_wait = 0;
+		as->suspend_result = err;
+	}
+	spin_unlock(&user_list_lock);
+	wake_up_interruptible(&apm_suspend_waitqueue);
+	return err;
+}
+
+static void standby(void)
+{
+	int	err;
+
+	local_irq_disable();
+	device_power_down(PMSG_SUSPEND);
+	/* serialize with the timer interrupt */
+	write_seqlock(&xtime_lock);
+	/* If needed, notify drivers here */
+	get_time_diff();
+	write_sequnlock(&xtime_lock);
+	local_irq_enable();
+
+	err = set_system_power_state(APM_STATE_STANDBY);
+	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
+		apm_error("standby", err);
+
+	local_irq_disable();
+	device_power_up();
+	local_irq_enable();
+}
+
+static apm_event_t get_event(void)
+{
+	int		error;
+	apm_event_t	event;
+	apm_eventinfo_t	info;
+
+	static int notified;
+
+	/* we don't use the eventinfo */
+	error = apm_get_event(&event, &info);
+	if (error == APM_SUCCESS)
+		return event;
+
+	if ((error != APM_NO_EVENTS) && (notified++ == 0))
+		apm_error("get_event", error);
+
+	return 0;
+}
+
+static void check_events(void)
+{
+	apm_event_t		event;
+	static unsigned long	last_resume;
+	static int		ignore_bounce;
+
+	while ((event = get_event()) != 0) {
+		if (debug) {
+			if (event <= NR_APM_EVENT_NAME)
+				printk(KERN_DEBUG "apm: received %s notify\n",
+				       apm_event_name[event - 1]);
+			else
+				printk(KERN_DEBUG "apm: received unknown "
+				       "event 0x%02x\n", event);
+		}
+		if (ignore_bounce
+		    && ((jiffies - last_resume) > bounce_interval))
+			ignore_bounce = 0;
+
+		switch (event) {
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+			queue_event(event, NULL);
+			if (standbys_pending <= 0)
+				standby();
+			break;
+
+		case APM_USER_SUSPEND:
+#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
+			if (apm_info.connection_version > 0x100)
+				set_system_power_state(APM_STATE_REJECT);
+			break;
+#endif
+		case APM_SYS_SUSPEND:
+			if (ignore_bounce) {
+				if (apm_info.connection_version > 0x100)
+					set_system_power_state(APM_STATE_REJECT);
+				break;
+			}
+			/*
+			 * If we are already processing a SUSPEND,
+			 * then further SUSPEND events from the BIOS
+			 * will be ignored.  We also return here to
+			 * cope with the fact that the Thinkpads keep
+			 * sending a SUSPEND event until something else
+			 * happens!
+			 */
+			if (ignore_sys_suspend)
+				return;
+			ignore_sys_suspend = 1;
+			queue_event(event, NULL);
+			if (suspends_pending <= 0)
+				(void) suspend(1);
+			break;
+
+		case APM_NORMAL_RESUME:
+		case APM_CRITICAL_RESUME:
+		case APM_STANDBY_RESUME:
+			ignore_sys_suspend = 0;
+			last_resume = jiffies;
+			ignore_bounce = 1;
+			if ((event != APM_NORMAL_RESUME)
+			    || (ignore_normal_resume == 0)) {
+				write_seqlock_irq(&xtime_lock);
+				set_time();
+				write_sequnlock_irq(&xtime_lock);
+				device_resume();
+				pm_send_all(PM_RESUME, (void *)0);
+				queue_event(event, NULL);
+			}
+			ignore_normal_resume = 0;
+			break;
+
+		case APM_CAPABILITY_CHANGE:
+		case APM_LOW_BATTERY:
+		case APM_POWER_STATUS_CHANGE:
+			queue_event(event, NULL);
+			/* If needed, notify drivers here */
+			break;
+
+		case APM_UPDATE_TIME:
+			write_seqlock_irq(&xtime_lock);
+			set_time();
+			write_sequnlock_irq(&xtime_lock);
+			break;
+
+		case APM_CRITICAL_SUSPEND:
+			/*
+			 * We are not allowed to reject a critical suspend.
+			 */
+			(void) suspend(0);
+			break;
+		}
+	}
+}
+
+static void apm_event_handler(void)
+{
+	static int	pending_count = 4;
+	int		err;
+
+	if ((standbys_pending > 0) || (suspends_pending > 0)) {
+		if ((apm_info.connection_version > 0x100) &&
+				(pending_count-- <= 0)) {
+			pending_count = 4;
+			if (debug)
+				printk(KERN_DEBUG "apm: setting state busy\n");
+			err = set_system_power_state(APM_STATE_BUSY);
+			if (err)
+				apm_error("busy", err);
+		}
+	} else
+		pending_count = 4;
+	check_events();
+}
+
+/*
+ * This is the APM thread main loop.
+ */
+
+static void apm_mainloop(void)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	add_wait_queue(&apm_waitqueue, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+	for (;;) {
+		schedule_timeout(APM_CHECK_TIMEOUT);
+		if (exit_kapmd)
+			break;
+		/*
+		 * Ok, check all events, check for idle (and mark us sleeping
+		 * so as not to count towards the load average)..
+		 */
+		set_current_state(TASK_INTERRUPTIBLE);
+		apm_event_handler();
+	}
+	remove_wait_queue(&apm_waitqueue, &wait);
+}
+
+static int check_apm_user(struct apm_user *as, const char *func)
+{
+	if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
+		printk(KERN_ERR "apm: %s passed bad filp\n", func);
+		return 1;
+	}
+	return 0;
+}
+
+static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
+{
+	struct apm_user *	as;
+	int			i;
+	apm_event_t		event;
+
+	as = fp->private_data;
+	if (check_apm_user(as, "read"))
+		return -EIO;
+	if ((int)count < sizeof(apm_event_t))
+		return -EINVAL;
+	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
+		return -EAGAIN;
+	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
+	i = count;
+	while ((i >= sizeof(event)) && !queue_empty(as)) {
+		event = get_queued_event(as);
+		if (copy_to_user(buf, &event, sizeof(event))) {
+			if (i < count)
+				break;
+			return -EFAULT;
+		}
+		switch (event) {
+		case APM_SYS_SUSPEND:
+		case APM_USER_SUSPEND:
+			as->suspends_read++;
+			break;
+
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+			as->standbys_read++;
+			break;
+		}
+		buf += sizeof(event);
+		i -= sizeof(event);
+	}
+	if (i < count)
+		return count - i;
+	if (signal_pending(current))
+		return -ERESTARTSYS;
+	return 0;
+}
+
+static unsigned int do_poll(struct file *fp, poll_table * wait)
+{
+	struct apm_user * as;
+
+	as = fp->private_data;
+	if (check_apm_user(as, "poll"))
+		return 0;
+	poll_wait(fp, &apm_waitqueue, wait);
+	if (!queue_empty(as))
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static int do_ioctl(struct inode * inode, struct file *filp,
+		    u_int cmd, u_long arg)
+{
+	struct apm_user *	as;
+
+	as = filp->private_data;
+	if (check_apm_user(as, "ioctl"))
+		return -EIO;
+	if ((!as->suser) || (!as->writer))
+		return -EPERM;
+	switch (cmd) {
+	case APM_IOC_STANDBY:
+		if (as->standbys_read > 0) {
+			as->standbys_read--;
+			as->standbys_pending--;
+			standbys_pending--;
+		} else
+			queue_event(APM_USER_STANDBY, as);
+		if (standbys_pending <= 0)
+			standby();
+		break;
+	case APM_IOC_SUSPEND:
+		if (as->suspends_read > 0) {
+			as->suspends_read--;
+			as->suspends_pending--;
+			suspends_pending--;
+		} else
+			queue_event(APM_USER_SUSPEND, as);
+		if (suspends_pending <= 0) {
+			return suspend(1);
+		} else {
+			as->suspend_wait = 1;
+			wait_event_interruptible(apm_suspend_waitqueue,
+					as->suspend_wait == 0);
+			return as->suspend_result;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int do_release(struct inode * inode, struct file * filp)
+{
+	struct apm_user *	as;
+
+	as = filp->private_data;
+	if (check_apm_user(as, "release"))
+		return 0;
+	filp->private_data = NULL;
+	if (as->standbys_pending > 0) {
+		standbys_pending -= as->standbys_pending;
+		if (standbys_pending <= 0)
+			standby();
+	}
+	if (as->suspends_pending > 0) {
+		suspends_pending -= as->suspends_pending;
+		if (suspends_pending <= 0)
+			(void) suspend(1);
+	}
+  	spin_lock(&user_list_lock);
+	if (user_list == as)
+		user_list = as->next;
+	else {
+		struct apm_user *	as1;
+
+		for (as1 = user_list;
+		     (as1 != NULL) && (as1->next != as);
+		     as1 = as1->next)
+			;
+		if (as1 == NULL)
+			printk(KERN_ERR "apm: filp not in user list\n");
+		else
+			as1->next = as->next;
+	}
+	spin_unlock(&user_list_lock);
+	kfree(as);
+	return 0;
+}
+
+static int do_open(struct inode * inode, struct file * filp)
+{
+	struct apm_user *	as;
+
+	as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
+	if (as == NULL) {
+		printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
+		       sizeof(*as));
+		return -ENOMEM;
+	}
+	as->magic = APM_BIOS_MAGIC;
+	as->event_tail = as->event_head = 0;
+	as->suspends_pending = as->standbys_pending = 0;
+	as->suspends_read = as->standbys_read = 0;
+	/*
+	 * XXX - this is a tiny bit broken, when we consider BSD
+         * process accounting. If the device is opened by root, we
+	 * instantly flag that we used superuser privs. Who knows,
+	 * we might close the device immediately without doing a
+	 * privileged operation -- cevans
+	 */
+	as->suser = capable(CAP_SYS_ADMIN);
+	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
+	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
+	spin_lock(&user_list_lock);
+	as->next = user_list;
+	user_list = as;
+	spin_unlock(&user_list_lock);
+	filp->private_data = as;
+	return 0;
+}
+
+static int apm_get_info(char *buf, char **start, off_t fpos, int length)
+{
+	char *		p;
+	unsigned short	bx;
+	unsigned short	cx;
+	unsigned short	dx;
+	int		error;
+	unsigned short  ac_line_status = 0xff;
+	unsigned short  battery_status = 0xff;
+	unsigned short  battery_flag   = 0xff;
+	int		percentage     = -1;
+	int             time_units     = -1;
+	char            *units         = "?";
+
+	p = buf;
+
+	if ((num_online_cpus() == 1) &&
+	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
+		ac_line_status = (bx >> 8) & 0xff;
+		battery_status = bx & 0xff;
+		if ((cx & 0xff) != 0xff)
+			percentage = cx & 0xff;
+
+		if (apm_info.connection_version > 0x100) {
+			battery_flag = (cx >> 8) & 0xff;
+			if (dx != 0xffff) {
+				units = (dx & 0x8000) ? "min" : "sec";
+				time_units = dx & 0x7fff;
+			}
+		}
+	}
+	/* Arguments, with symbols from linux/apm_bios.h.  Information is
+	   from the Get Power Status (0x0a) call unless otherwise noted.
+
+	   0) Linux driver version (this will change if format changes)
+	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
+	   2) APM flags from APM Installation Check (0x00):
+	      bit 0: APM_16_BIT_SUPPORT
+	      bit 1: APM_32_BIT_SUPPORT
+	      bit 2: APM_IDLE_SLOWS_CLOCK
+	      bit 3: APM_BIOS_DISABLED
+	      bit 4: APM_BIOS_DISENGAGED
+	   3) AC line status
+	      0x00: Off-line
+	      0x01: On-line
+	      0x02: On backup power (BIOS >= 1.1 only)
+	      0xff: Unknown
+	   4) Battery status
+	      0x00: High
+	      0x01: Low
+	      0x02: Critical
+	      0x03: Charging
+	      0x04: Selected battery not present (BIOS >= 1.2 only)
+	      0xff: Unknown
+	   5) Battery flag
+	      bit 0: High
+	      bit 1: Low
+	      bit 2: Critical
+	      bit 3: Charging
+	      bit 7: No system battery
+	      0xff: Unknown
+	   6) Remaining battery life (percentage of charge):
+	      0-100: valid
+	      -1: Unknown
+	   7) Remaining battery life (time units):
+	      Number of remaining minutes or seconds
+	      -1: Unknown
+	   8) min = minutes; sec = seconds */
+
+	p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
+		     driver_version,
+		     (apm_info.bios.version >> 8) & 0xff,
+		     apm_info.bios.version & 0xff,
+		     apm_info.bios.flags,
+		     ac_line_status,
+		     battery_status,
+		     battery_flag,
+		     percentage,
+		     time_units,
+		     units);
+
+	return p - buf;
+}
+
+static int apm(void *unused)
+{
+	unsigned short	bx;
+	unsigned short	cx;
+	unsigned short	dx;
+	int		error;
+	char *		power_stat;
+	char *		bat_stat;
+
+	kapmd_running = 1;
+
+	daemonize("kapmd");
+
+	current->flags |= PF_NOFREEZE;
+
+#ifdef CONFIG_SMP
+	/* 2002/08/01 - WT
+	 * This is to avoid random crashes at boot time during initialization
+	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
+	 * Some bioses don't like being called from CPU != 0.
+	 * Method suggested by Ingo Molnar.
+	 */
+	set_cpus_allowed(current, cpumask_of_cpu(0));
+	BUG_ON(smp_processor_id() != 0);
+#endif
+
+	if (apm_info.connection_version == 0) {
+		apm_info.connection_version = apm_info.bios.version;
+		if (apm_info.connection_version > 0x100) {
+			/*
+			 * We only support BIOSs up to version 1.2
+			 */
+			if (apm_info.connection_version > 0x0102)
+				apm_info.connection_version = 0x0102;
+			error = apm_driver_version(&apm_info.connection_version);
+			if (error != APM_SUCCESS) {
+				apm_error("driver version", error);
+				/* Fall back to an APM 1.0 connection. */
+				apm_info.connection_version = 0x100;
+			}
+		}
+	}
+
+	if (debug)
+		printk(KERN_INFO "apm: Connection version %d.%d\n",
+			(apm_info.connection_version >> 8) & 0xff,
+			apm_info.connection_version & 0xff);
+
+#ifdef CONFIG_APM_DO_ENABLE
+	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
+		/*
+		 * This call causes my NEC UltraLite Versa 33/C to hang if it
+		 * is booted with PM disabled but not in the docking station.
+		 * Unfortunate ...
+		 */
+		error = apm_enable_power_management(1);
+		if (error) {
+			apm_error("enable power management", error);
+			return -1;
+		}
+	}
+#endif
+
+	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
+	    && (apm_info.connection_version > 0x0100)) {
+		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
+		if (error) {
+			apm_error("engage power management", error);
+			return -1;
+		}
+	}
+
+	if (debug && (num_online_cpus() == 1 || smp )) {
+		error = apm_get_power_status(&bx, &cx, &dx);
+		if (error)
+			printk(KERN_INFO "apm: power status not available\n");
+		else {
+			switch ((bx >> 8) & 0xff) {
+			case 0: power_stat = "off line"; break;
+			case 1: power_stat = "on line"; break;
+			case 2: power_stat = "on backup power"; break;
+			default: power_stat = "unknown"; break;
+			}
+			switch (bx & 0xff) {
+			case 0: bat_stat = "high"; break;
+			case 1: bat_stat = "low"; break;
+			case 2: bat_stat = "critical"; break;
+			case 3: bat_stat = "charging"; break;
+			default: bat_stat = "unknown"; break;
+			}
+			printk(KERN_INFO
+			       "apm: AC %s, battery status %s, battery life ",
+			       power_stat, bat_stat);
+			if ((cx & 0xff) == 0xff)
+				printk("unknown\n");
+			else
+				printk("%d%%\n", cx & 0xff);
+			if (apm_info.connection_version > 0x100) {
+				printk(KERN_INFO
+				       "apm: battery flag 0x%02x, battery life ",
+				       (cx >> 8) & 0xff);
+				if (dx == 0xffff)
+					printk("unknown\n");
+				else
+					printk("%d %s\n", dx & 0x7fff,
+						(dx & 0x8000) ?
+						"minutes" : "seconds");
+			}
+		}
+	}
+
+	/* Install our power off handler.. */
+	if (power_off)
+		pm_power_off = apm_power_off;
+
+	if (num_online_cpus() == 1 || smp) {
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+		console_blank_hook = apm_console_blank;
+#endif
+		apm_mainloop();
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+		console_blank_hook = NULL;
+#endif
+	}
+	kapmd_running = 0;
+
+	return 0;
+}
+
+#ifndef MODULE
+static int __init apm_setup(char *str)
+{
+	int	invert;
+
+	while ((str != NULL) && (*str != '\0')) {
+		if (strncmp(str, "off", 3) == 0)
+			apm_disabled = 1;
+		if (strncmp(str, "on", 2) == 0)
+			apm_disabled = 0;
+		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
+		    (strncmp(str, "bounce_interval=", 16) == 0))
+			bounce_interval = simple_strtol(str + 16, NULL, 0);
+		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
+		    (strncmp(str, "idle_threshold=", 15) == 0))
+			idle_threshold = simple_strtol(str + 15, NULL, 0);
+		if ((strncmp(str, "idle-period=", 12) == 0) ||
+		    (strncmp(str, "idle_period=", 12) == 0))
+			idle_period = simple_strtol(str + 12, NULL, 0);
+		invert = (strncmp(str, "no-", 3) == 0) ||
+			(strncmp(str, "no_", 3) == 0);
+		if (invert)
+			str += 3;
+		if (strncmp(str, "debug", 5) == 0)
+			debug = !invert;
+		if ((strncmp(str, "power-off", 9) == 0) ||
+		    (strncmp(str, "power_off", 9) == 0))
+			power_off = !invert;
+		if (strncmp(str, "smp", 3) == 0)
+		{
+			smp = !invert;
+			idle_threshold = 100;
+		}
+		if ((strncmp(str, "allow-ints", 10) == 0) ||
+		    (strncmp(str, "allow_ints", 10) == 0))
+ 			apm_info.allow_ints = !invert;
+		if ((strncmp(str, "broken-psr", 10) == 0) ||
+		    (strncmp(str, "broken_psr", 10) == 0))
+			apm_info.get_power_status_broken = !invert;
+		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
+		    (strncmp(str, "realmode_power_off", 18) == 0))
+			apm_info.realmode_power_off = !invert;
+		str = strchr(str, ',');
+		if (str != NULL)
+			str += strspn(str, ", \t");
+	}
+	return 1;
+}
+
+__setup("apm=", apm_setup);
+#endif
+
+static struct file_operations apm_bios_fops = {
+	.owner		= THIS_MODULE,
+	.read		= do_read,
+	.poll		= do_poll,
+	.ioctl		= do_ioctl,
+	.open		= do_open,
+	.release	= do_release,
+};
+
+static struct miscdevice apm_device = {
+	APM_MINOR_DEV,
+	"apm_bios",
+	&apm_bios_fops
+};
+
+
+/* Simple "print if true" callback */
+static int __init print_if_true(struct dmi_system_id *d)
+{
+	printk("%s\n", d->ident);
+	return 0;
+}
+
+/*
+ * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
+ * disabled before the suspend. Linux used to get terribly confused by that.
+ */
+static int __init broken_ps2_resume(struct dmi_system_id *d)
+{
+	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
+	return 0;
+}
+
+/* Some bioses have a broken protected mode poweroff and need to use realmode */
+static int __init set_realmode_power_off(struct dmi_system_id *d)
+{
+	if (apm_info.realmode_power_off == 0) {
+		apm_info.realmode_power_off = 1;
+		printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
+	}
+	return 0;
+}
+
+/* Some laptops require interrupts to be enabled during APM calls */
+static int __init set_apm_ints(struct dmi_system_id *d)
+{
+	if (apm_info.allow_ints == 0) {
+		apm_info.allow_ints = 1;
+		printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
+	}
+	return 0;
+}
+
+/* Some APM bioses corrupt memory or just plain do not work */
+static int __init apm_is_horked(struct dmi_system_id *d)
+{
+	if (apm_info.disabled == 0) {
+		apm_info.disabled = 1;
+		printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
+	}
+	return 0;
+}
+
+static int __init apm_is_horked_d850md(struct dmi_system_id *d)
+{
+	if (apm_info.disabled == 0) {
+		apm_info.disabled = 1;
+		printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
+		printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
+		printk(KERN_INFO "download from support.intel.com \n");
+	}
+	return 0;
+}
+
+/* Some APM bioses hang on APM idle calls */
+static int __init apm_likes_to_melt(struct dmi_system_id *d)
+{
+	if (apm_info.forbid_idle == 0) {
+		apm_info.forbid_idle = 1;
+		printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
+	}
+	return 0;
+}
+
+/*
+ *  Check for clue free BIOS implementations who use
+ *  the following QA technique
+ *
+ *      [ Write BIOS Code ]<------
+ *               |                ^
+ *      < Does it Compile >----N--
+ *               |Y               ^
+ *	< Does it Boot Win98 >-N--
+ *               |Y
+ *           [Ship It]
+ *
+ *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
+ *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
+ */
+static int __init broken_apm_power(struct dmi_system_id *d)
+{
+	apm_info.get_power_status_broken = 1;
+	printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
+	return 0;
+}
+
+/*
+ * This bios swaps the APM minute reporting bytes over (Many sony laptops
+ * have this problem).
+ */
+static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
+{
+	apm_info.get_power_status_swabinminutes = 1;
+	printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
+	return 0;
+}
+
+static struct dmi_system_id __initdata apm_dmi_table[] = {
+	{
+		print_if_true,
+		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
+	},
+	{	/* Handle problems with APM on the C600 */
+		broken_ps2_resume, "Dell Latitude C600",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
+	},
+	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
+		set_apm_ints, "Dell Latitude",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Dell Inspiron 2500",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
+			DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+	},
+	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
+		set_apm_ints, "Dell Inspiron", {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
+	},
+	{	/* Handle problems with APM on Inspiron 5000e */
+		broken_apm_power, "Dell Inspiron 5000e",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
+			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
+	},
+	{	/* Handle problems with APM on Inspiron 2500 */
+		broken_apm_power, "Dell Inspiron 2500",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
+			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Dell Dimension 4100",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
+			DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
+			DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+	},
+	{	/* Allow interrupts during suspend on Compaq Laptops*/
+		set_apm_ints, "Compaq 12XL125",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
+			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
+	},
+	{	/* Allow interrupts during APM or the clock goes slow */
+		set_apm_ints, "ASUSTeK",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
+	},
+	{	/* APM blows on shutdown */
+		apm_is_horked, "ABIT KX7-333[R]",
+		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
+			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Trigem Delhi3",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Fujitsu-Siemens",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
+			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked_d850md, "Intel D850MD",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Intel D810EMO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Dell XPS-Z",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Sharp PC-PJ/AX",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
+			DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
+			DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
+	},
+	{	/* APM crashes */
+		apm_is_horked, "Dell Inspiron 2500",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
+			DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+	},
+	{	/* APM idle hangs */
+		apm_likes_to_melt, "Jabil AMD",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
+	},
+	{	/* APM idle hangs */
+		apm_likes_to_melt, "AMI Bios",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
+			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
+			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
+			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
+			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
+			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
+			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
+			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
+			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
+			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
+			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
+	},
+
+	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
+			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
+			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
+	},
+	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
+		swab_apm_power_in_minutes, "Sony VAIO",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
+			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
+	},
+	{	/* broken PM poweroff bios */
+		set_realmode_power_off, "Award Software v4.60 PGMA",
+		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
+			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
+			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
+	},
+
+	/* Generic per vendor APM settings  */
+
+	{	/* Allow interrupts during suspend on IBM laptops */
+		set_apm_ints, "IBM",
+		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
+	},
+
+	{ }
+};
+
+/*
+ * Just start the APM thread. We do NOT want to do APM BIOS
+ * calls from anything but the APM thread, if for no other reason
+ * than the fact that we don't trust the APM BIOS. This way,
+ * most common APM BIOS problems that lead to protection errors
+ * etc will have at least some level of being contained...
+ *
+ * In short, if something bad happens, at least we have a choice
+ * of just killing the apm thread..
+ */
+static int __init apm_init(void)
+{
+	struct proc_dir_entry *apm_proc;
+	int ret;
+	int i;
+
+	dmi_check_system(apm_dmi_table);
+
+	if (apm_info.bios.version == 0) {
+		printk(KERN_INFO "apm: BIOS not found.\n");
+		return -ENODEV;
+	}
+	printk(KERN_INFO
+		"apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
+		((apm_info.bios.version >> 8) & 0xff),
+		(apm_info.bios.version & 0xff),
+		apm_info.bios.flags,
+		driver_version);
+	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
+		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
+		return -ENODEV;
+	}
+
+	if (allow_ints)
+		apm_info.allow_ints = 1;
+	if (broken_psr)
+		apm_info.get_power_status_broken = 1;
+	if (realmode_power_off)
+		apm_info.realmode_power_off = 1;
+	/* User can override, but default is to trust DMI */
+	if (apm_disabled != -1)
+		apm_info.disabled = apm_disabled;
+
+	/*
+	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
+	 * but is reportedly a 1.0 BIOS.
+	 */
+	if (apm_info.bios.version == 0x001)
+		apm_info.bios.version = 0x100;
+
+	/* BIOS < 1.2 doesn't set cseg_16_len */
+	if (apm_info.bios.version < 0x102)
+		apm_info.bios.cseg_16_len = 0; /* 64k */
+
+	if (debug) {
+		printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
+			apm_info.bios.cseg, apm_info.bios.offset,
+			apm_info.bios.cseg_16, apm_info.bios.dseg);
+		if (apm_info.bios.version > 0x100)
+			printk(" cseg len %x, dseg len %x",
+				apm_info.bios.cseg_len,
+				apm_info.bios.dseg_len);
+		if (apm_info.bios.version > 0x101)
+			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
+		printk("\n");
+	}
+
+	if (apm_info.disabled) {
+		printk(KERN_NOTICE "apm: disabled on user request.\n");
+		return -ENODEV;
+	}
+	if ((num_online_cpus() > 1) && !power_off && !smp) {
+		printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
+		apm_info.disabled = 1;
+		return -ENODEV;
+	}
+	if (PM_IS_ACTIVE()) {
+		printk(KERN_NOTICE "apm: overridden by ACPI.\n");
+		apm_info.disabled = 1;
+		return -ENODEV;
+	}
+	pm_active = 1;
+
+	/*
+	 * Set up a segment that references the real mode segment 0x40
+	 * that extends up to the end of page zero (that we have reserved).
+	 * This is for buggy BIOS's that refer to (real mode) segment 0x40
+	 * even though they are called in protected mode.
+	 */
+	set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
+	_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
+
+	apm_bios_entry.offset = apm_info.bios.offset;
+	apm_bios_entry.segment = APM_CS;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+			 __va((unsigned long)apm_info.bios.cseg << 4));
+		set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+			 __va((unsigned long)apm_info.bios.cseg_16 << 4));
+		set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+			 __va((unsigned long)apm_info.bios.dseg << 4));
+#ifndef APM_RELAX_SEGMENTS
+		if (apm_info.bios.version == 0x100) {
+#endif
+			/* For ASUS motherboard, Award BIOS rev 110 (and others?) */
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1);
+			/* For some unknown machine. */
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1);
+			/* For the DEC Hinote Ultra CT475 (and others?) */
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1);
+#ifndef APM_RELAX_SEGMENTS
+		} else {
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+				(apm_info.bios.cseg_len - 1) & 0xffff);
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+				(apm_info.bios.cseg_16_len - 1) & 0xffff);
+			_set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+				(apm_info.bios.dseg_len - 1) & 0xffff);
+		      /* workaround for broken BIOSes */
+	                if (apm_info.bios.cseg_len <= apm_info.bios.offset)
+        	                _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1);
+                       if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
+                        	/* for the BIOS that assumes granularity = 1 */
+                        	per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000;
+                        	printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
+        	        }
+		}
+#endif
+	}
+
+	apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
+	if (apm_proc)
+		apm_proc->owner = THIS_MODULE;
+
+	ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
+	if (ret < 0) {
+		printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
+		return -ENOMEM;
+	}
+
+	if (num_online_cpus() > 1 && !smp ) {
+		printk(KERN_NOTICE
+		   "apm: disabled - APM is not SMP safe (power off active).\n");
+		return 0;
+	}
+
+	misc_register(&apm_device);
+
+	if (HZ != 100)
+		idle_period = (idle_period * HZ) / 100;
+	if (idle_threshold < 100) {
+		original_pm_idle = pm_idle;
+		pm_idle  = apm_cpu_idle;
+		set_pm_idle = 1;
+	}
+
+	return 0;
+}
+
+static void __exit apm_exit(void)
+{
+	int	error;
+
+	if (set_pm_idle) {
+		pm_idle = original_pm_idle;
+		/*
+		 * We are about to unload the current idle thread pm callback
+		 * (pm_idle), Wait for all processors to update cached/local
+		 * copies of pm_idle before proceeding.
+		 */
+		cpu_idle_wait();
+	}
+	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
+	    && (apm_info.connection_version > 0x0100)) {
+		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
+		if (error)
+			apm_error("disengage power management", error);
+	}
+	misc_deregister(&apm_device);
+	remove_proc_entry("apm", NULL);
+	if (power_off)
+		pm_power_off = NULL;
+	exit_kapmd = 1;
+	while (kapmd_running)
+		schedule();
+	pm_active = 0;
+}
+
+module_init(apm_init);
+module_exit(apm_exit);
+
+MODULE_AUTHOR("Stephen Rothwell");
+MODULE_DESCRIPTION("Advanced Power Management");
+MODULE_LICENSE("GPL");
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debug mode");
+module_param(power_off, bool, 0444);
+MODULE_PARM_DESC(power_off, "Enable power off");
+module_param(bounce_interval, int, 0444);
+MODULE_PARM_DESC(bounce_interval,
+		"Set the number of ticks to ignore suspend bounces");
+module_param(allow_ints, bool, 0444);
+MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
+module_param(broken_psr, bool, 0444);
+MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
+module_param(realmode_power_off, bool, 0444);
+MODULE_PARM_DESC(realmode_power_off,
+		"Switch to real mode before powering off");
+module_param(idle_threshold, int, 0444);
+MODULE_PARM_DESC(idle_threshold,
+	"System idle percentage above which to make APM BIOS idle calls");
+module_param(idle_period, int, 0444);
+MODULE_PARM_DESC(idle_period,
+	"Period (in sec/100) over which to caculate the idle percentage");
+module_param(smp, bool, 0444);
+MODULE_PARM_DESC(smp,
+	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
+MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);