A simple loop multi-channel program kernel code implementation

Zhang Han + original works reproduced please specify the source + "Linux kernel analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000

First of all. Read the core code of the program

void __init My_start_kernel (void)
{
int i = 0;
while (1)
{
i++;
if (i%100000 = = 0)
PRINTK (kern_notice "My_start_kernel here%d \ n", i);

}
}

This is the startup function of the kernel code. C language writing. The loop portion is 100,000 times per run. Outputs a statement.

void My_timer_handler (void)
{
PRINTK (kern_notice "\n>>>>>>>>>>>>>>>>>my_timer_handler here <<<<<<<<<<<<<<<<<<\n\n ");
}

This code is called when the time is interrupted. Output a statement each time it is called.

It then consolidates the code that was written and then consolidates it into the Linux Kernel-3.9.4.

or download Mykernel_for_linux3.9.4sc.patch directly

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Then download the Linux kernel-3.9.4

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After the download is complete, unzip.

Enter the extracted directory:

• CD linux-3.9.4

compile your own code into the linux-3.9.4 .

• Patch-p1 <. /mykernel_for_linux3.9.4sc.patch
• Make Allnoconfig
• Make

Finally, install QEMU and execute kernel.

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last. Execution Kernel
execution results. The display of the terminal is in fact constantly changing. A section (assuming that the flicker is too fast, to increase the value of the function to slow down the speed of change)

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A simple loop multi-channel program kernel code implementation