/tmp/l4check/full_tree/trunk/l4/pkg/dde_linux/lib/src/global.c File Reference

Globally Required Stuff. More...

#include <l4/lock/lock.h>
#include <l4/dde_linux/dde.h>
#include <asm/system.h>
#include "internal.h"
#include <stdlib.h>
#include <linux/spinlock.h>
#include <asm/delay.h>
#include <linux/reboot.h>

Go to the source code of this file.

Synchronization
Linux kernel synchronization is sometimes based on cli()/sti() pairs. As discussed in "Taming Linux" simply disabling Interrupts via cli and sti assembly statements is unacceptable in DROPS. The DDE uses the same lock based scheme as a tamed L4Linux server.
static l4lock_t	irq_lock = L4LOCK_UNLOCKED_INITIALIZER
	Interrupt lock.
void	__global_cli ()
	Global CLear Interrupt flag.
void	__global_sti ()
	Global SeT Interrupt flag.
unsigned long	__global_save_flags ()
	Global save flags.
void	__global_restore_flags (unsigned long flags)
	Global restore flags.
Miscellaneous
spinlock_cacheline_t	kernel_flag_cacheline = {SPIN_LOCK_UNLOCKED}
	BIG kernel lock.
int	get_option (char **str, int *pint)
	Parse integer from an option string (from lib/cmdline.c).
char *	get_options (char *str, int nints, int *ints)
	Parse a string into a list of integers (from lib/cmdline.c).
void	udelay (unsigned long usecs)
	Delay some usecs.
int	l4dde_driver_classes_init (void)
	Dummy for DDE2.6.
int	register_reboot_notifier (struct notifier_block *arg0)
	Dummy .
int	unregister_reboot_notifier (struct notifier_block *arg0)
	Dummy .

---

Detailed Description

Globally Required Stuff.

Date:

08/28/2003

Author:

Christian Helmuth <ch12@os.inf.tu-dresden.de>

Definition in file global.c.

---

Function Documentation

void __global_cli

(

)

Global CLear Interrupt flag.

Acquire irq_lock. Do not grab it twice!

Definition at line 43 of file global.c.

void __global_restore_flags

(

unsigned long

flags

)

Global restore flags.

Parameters:

flags

indicates action

It restores irq_lock state.

See also:

__global_save_flags

Definition at line 84 of file global.c.

unsigned long __global_save_flags

(

)

Global save flags.

Returns:

flags indicating action on __global_restore_flags(flag)

0 - global cli 1 - global sti 2 - local cli <unused> 3 - local sti <unused>

It is used to save the current irq_lock state.

See also:

__global_restore_flags

Definition at line 70 of file global.c.

void __global_sti

(

)

Global SeT Interrupt flag.

Release irq_lock.

Definition at line 53 of file global.c.

int register_reboot_notifier

(

struct notifier_block *

arg0

)

Dummy .

..

Definition at line 172 of file global.c.

void udelay

(

unsigned long

usecs

)

Delay some usecs.

Todo:

consider l4_busy_wait_us() for short delays

Definition at line 156 of file global.c.

int unregister_reboot_notifier

(

struct notifier_block *

arg0

)

Dummy .

..

Definition at line 181 of file global.c.