Linux kernel code explained in detail see the document inside the pdf file. A very good document, but a bit older version.

linux-0.11\linux-0.11\Makefile
..........\..........\boot\head.s
..........\..........\....\setup.s
..........\..........\....\bootsect.s
..........\..........\fs\stat.c
..........\..........\..\Makefile
..........\..........\..\read_write.c
..........\..........\..\block_dev.c
..........\..........\..\buffer.c
..........\..........\..\inode.c
..........\..........\..\file_table.c
..........\..........\..\open.c
..........\..........\..\char_dev.c
..........\..........\..\exec.c
..........\..........\..\file_dev.c
..........\..........\..\fcntl.c
..........\..........\..\super.c
..........\..........\..\namei.c
..........\..........\..\ioctl.c
..........\..........\..\pipe.c
..........\..........\..\truncate.c
..........\..........\..\bitmap.c
..........\..........\include\sys\stat.h
..........\..........\.......\...\types.h
..........\..........\.......\...\times.h
..........\..........\.......\...\utsname.h
..........\..........\.......\...\wait.h
..........\..........\.......\unistd.h
..........\..........\.......\time.h
..........\..........\.......\termios.h
..........\..........\.......\stddef.h
..........\..........\.......\stdarg.h
..........\..........\.......\fcntl.h
..........\..........\.......\utime.h
..........\..........\.......\string.h
..........\..........\.......\errno.h
..........\..........\.......\signal.h
..........\..........\.......\const.h
..........\..........\.......\a.out.h
..........\..........\.......\ctype.h
..........\..........\.......\linux\hdreg.h
..........\..........\.......\.....\kernel.h
..........\..........\.......\.....\sched.h
..........\..........\.......\.....\sys.h
..........\..........\.......\.....\tty.h
..........\..........\.......\.....\fs.h
..........\..........\.......\.....\mm.h
..........\..........\.......\.....\head.h
..........\..........\.......\.....\config.h
..........\..........\.......\.....\fdreg.h
..........\..........\.......\asm\io.h
..........\..........\.......\...\memory.h
..........\..........\.......\...\system.h
..........\..........\.......\...\segment.h
..........\..........\..it\main.c
..........\..........\kernel\Makefile
..........\..........\......\sched.c
..........\..........\......\system_call.s
..........\..........\......\exit.c
..........\..........\......\fork.c
..........\..........\......\panic.c
..........\..........\......\traps.c
..........\..........\......\asm.s
..........\..........\......\signal.c
..........\..........\......\printk.c
..........\..........\......\sys.c
..........\..........\......\mktime.c
..........\..........\......\vsprintf.c
..........\..........\......\chr_drv\keyboard.S
..........\..........\......\.......\Makefile
..........\..........\......\.......\rs_io.s
..........\..........\......\.......\console.c
..........\..........\......\.......\tty_io.c
..........\..........\......\.......\serial.c
..........\..........\......\.......\tty_ioctl.c
..........\..........\......\math\Makefile
..........\..........\......\....\math_emulate.c
..........\..........\......\blk_drv\hd.c
..........\..........\......\.......\ll_rw_blk.c
..........\..........\......\.......\floppy.c
..........\..........\......\.......\Makefile
..........\..........\......\.......\blk.h
..........\..........\......\.......\ramdisk.c
..........\..........\lib\Makefile
..........\..........\...\ctype.c
..........\..........\...\close.c
..........\..........\...\dup.c
..........\..........\...\_exit.c
..........\..........\...\open.c
..........\..........\...\errno.c
..........\..........\...\execve.c
..........\..........\...\setsid.c
..........\..........\...\string.c
..........\..........\...\wait.c
..........\..........\...\write.c
..........\..........\...\malloc.c
..........\..........\mm\Makefile
..........\..........\..\page.s
..........\..........\..\memory.c
..........\..........\tools\build.c

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