Assume that your linux source base directory is /usr/src/linux.

Kernel files to be modified are listed below:

1. /usr/src/linux/arch/i386/kernel/syscall_table.S

2. /usr/src/linux/include/asm-i386/unistd.h

3. /usr/src/linux/include/linux/syscalls.h

4. /usr/src/linux/Makefile

New kernel files/directories to be created are listed below:

1. /usr/src/linux/mycall - Directory that will contain the source file, header file and the Makefile for our system call (You can also implement your system call in an existing file).

2. /usr/src/linux/mycall/mycall.c - Source file containing our system call code.

3. /usr/src/linux/mycall/Makefile - Makefile

New user space files, to be created, to test our system call are listed below:

1. testmycall.c - Source file that will call our system call.

2. testmycall.h - Header file.