The Linux kernel keeps track of the global variable jiffies, which maintains the number of timer interrupts that have occurred since the system was booted. The jiffies variable is declared in the file . Design a kernel module that creates a /proc file named /proc/jiffies that reports the current value of jiffies when the /proc/jiffies file is read, such as with the command cat /proc/jiffies Be sure to remove /proc/jiffies when the module is removed. This question should be completed using the Linux virtual machine you installed as part of Lab1.
#include <linux/module.h> #include <linux/kernel.h> // part 2 #include <linux/sched.h> // part 2 extra #include <linux/hash.h> #include <linux/gcd.h> #include <asm/param.h> #include <linux/jiffies.h> void print_init_PCB(void) { printk(KERN_INFO "init_task pid:%d\n", init_task.pid); printk(KERN_INFO "init_task state:%lu\n", init_task.state); printk(KERN_INFO "init_task flags:%d\n", init_task.flags); printk(KERN_INFO "init_task runtime priority:%d\n", init_task.rt_priority); printk(KERN_INFO "init_task process policy:%d\n", init_task.policy); printk(KERN_INFO "init_task task group id:%d\n", init_task.tgid); } /* This function is called when the module is loaded. */ int simple_init(void) { printk(KERN_INFO "Loading Module\n"); print_init_PCB(); printk(KERN_INFO "Golden Ration Prime = %lu\n", GOLDEN_RATIO_PRIME); printk(KERN_INFO "HZ = %d\n", HZ); printk(KERN_INFO "enter jiffies = %lu\n", jiffies); return 0; } /* This function is called when the module is removed. */ void simple_exit(void) { printk(KERN_INFO "Removing Module\n"); printk(KERN_INFO "gcd of 3300 and 24 = %lu\n", gcd(3300,24)); printk(KERN_INFO "exit jiffies = %lu\n", jiffies); } /* Macros for registering module entry and exit points. */ module_init( simple_init ); module_exit( simple_exit ); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Simple Module"); MODULE_AUTHOR("SGG");
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