i386: prepare shared kernel/apm.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 2403 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
deleted file mode 100644
index f02a8aca826b..000000000000
--- a/arch/i386/kernel/apm.c
+++ /dev/null
@@ -1,2403 +0,0 @@
-/* -*- 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/whdc/archive/amp_12.mspx]
- */
-
-#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/seq_file.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/pm_legacy.h>
-#include <linux/capability.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/freezer.h>
-#include <linux/smp.h>
-#include <linux/dmi.h>
-#include <linux/suspend.h>
-#include <linux/kthread.h>
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/desc.h>
-#include <asm/i8253.h>
-#include <asm/paravirt.h>
-#include <asm/reboot.h>
-
-#include "io_ports.h"
-
-#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 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;
-	unsigned int	suser: 1;
-	unsigned int	writer: 1;
-	unsigned int	reader: 1;
-	unsigned 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 __read_mostly = DEFAULT_IDLE_THRESHOLD;
-static int			idle_period __read_mostly = 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 __read_mostly = DEFAULT_BOUNCE_INTERVAL;
-
-static int			debug __read_mostly;
-static int			smp __read_mostly;
-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
-#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 const struct desc_struct	bad_bios_desc = { 0, 0x00409200 };
-
-static const char		driver_version[] = "1.16ac";	/* no spaces */
-
-static struct task_struct *kapmd_task;
-
-/*
- *	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 const char *	const 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 ARRAY_SIZE(apm_event_name)
-
-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	ARRAY_SIZE(error_table)
-
-/**
- *	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.
- */
-
-static inline unsigned long __apm_irq_save(void)
-{
-	unsigned long flags;
-	local_save_flags(flags);
-	if (apm_info.allow_ints) {
-		if (irqs_disabled_flags(flags))
-			local_irq_enable();
-	} else
-		local_irq_disable();
-
-	return flags;
-}
-
-#define apm_irq_save(flags) \
-	do { flags = __apm_irq_save(); } while (0)
-
-static inline void apm_irq_restore(unsigned long flags)
-{
-	if (irqs_disabled_flags(flags))
-		local_irq_disable();
-	else if (irqs_disabled())
-		local_irq_enable();
-}
-
-#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;
-	struct desc_struct	*gdt;
-
-	cpus = apm_save_cpus();
-	
-	cpu = get_cpu();
-	gdt = get_cpu_gdt_table(cpu);
-	save_desc_40 = gdt[0x40 / 8];
-	gdt[0x40 / 8] = bad_bios_desc;
-
-	apm_irq_save(flags);
-	APM_DO_SAVE_SEGS;
-	apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
-	APM_DO_RESTORE_SEGS;
-	apm_irq_restore(flags);
-	gdt[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 returns one value only, 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;
-	struct desc_struct	*gdt;
-
-	cpus = apm_save_cpus();
-	
-	cpu = get_cpu();
-	gdt = get_cpu_gdt_table(cpu);
-	save_desc_40 = gdt[0x40 / 8];
-	gdt[0x40 / 8] = bad_bios_desc;
-
-	apm_irq_save(flags);
-	APM_DO_SAVE_SEGS;
-	error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
-	APM_DO_RESTORE_SEGS;
-	apm_irq_restore(flags);
-	gdt[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;
-	u8	ret = 0;
-	int	idled = 0;
-	int	polling;
-
-	polling = !!(current_thread_info()->status & TS_POLLING);
-	if (polling) {
-		current_thread_info()->status &= ~TS_POLLING;
-		/*
-		 * TS_POLLING-cleared state must be visible before we
-		 * test NEED_RESCHED:
-		 */
-		smp_mb();
-	}
-	if (!need_resched()) {
-		idled = 1;
-		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
-	}
-	if (polling)
-		current_thread_info()->status |= TS_POLLING;
-
-	if (!idled)
-		return 0;
-
-	if (ret) {
-		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) __read_mostly;
-
-/**
- * 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       */
-	};
-
-	/* Some bioses don't like being called from CPU != 0 */
-	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;
-