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Sample text

You can use register_chrdev() to register and release_chrdev() to release character-oriented devices. The virtual file /proc/devices lists all devices currently known to the kernel. This file is used to find the major number of a driver in the user address space, in case none has been specified during the registration. To be able to use a device that has not been registered yet, you need to first select a driver and generate an entry in the /dev directory. To create this entry, you use the command mknod /dev/name typ major minor, which is passed the name, the type (b or c), the major number of the driver, and the selected minor number for that device.

As long as the activities in the Linux kernel operate independently, there will not be any problem. But as soon as several activities access the same data structures, there can be undesired effects, even in single-processor systems. Figure 2-2 shows an example with two activities, A and B, trying to add the structures skb_a and skb_b to the list queue. At some point, activity A is interrupted by activity B. After some processing of B, A continues with its operations. Figure 2-3 shows the result of this procedure of the two activities.

One of the goals set when developing the APIC timer was to pack as much functionality and tasks as possible into one module to keep the understanding and maintenance simple. Unfortunately, there is no way around changes to the kernel for two reasons: First, you first have to activate the APIC component; second, there is no interface to register an interrupt handling routing for the APIC timer interrupt; request_irq() does not help either. For this reason, the APIC timer handling routing, smp_apic_timer_interrupt(), normally used in an SMP configuration, is overwritten by another one, which allows entry into the use as a freely programmable timer (set_apic_timer_up_handler()).

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