課程大綱： Embedded GNU/Linux Kernel Internals and Device Drivers培訓(xùn)
Introduction
quick history of GNU/Linux
licensing
kernel versioning
release cycle
kernel trees
mainline
kernel vs. user space
mechanism vs. policy
kernel driver alternatives
RTOS vs. Linux
Memory Management
Virtual memory vs. physical memory
memory allocation in kernel
pages
zones
API
slab
Kernel Patch
life cycle
git
kernel source
create patch
check patch
fix patch
ship patch
audited code
Kernel Modules
get kernel sources
configure/build/install
device drivers (statically linked, loaded at runtime)
init/exit
licensing
EXPORT SYMBOL GPL
out of tree makefile
module-init-tools
module in kernel tree
Kconfig
parameter passing
sparse
Char Drivers
architecture
user/kernel interface
I/O subsystem
VFS
sysfs (devices, bus, drivers, classes),
kobject/ktype/kset
linux kernel driver model
device files
char driver
initialization
registration
open, release
cdev, cdev add, cdev del,...
major/minor numbers
udev, udevmonitor, udevadm
Advanced Charachter Driver Operations
ioctl
unlocked ioctl
compat ioctl
user space API
kernel space API
process lifecycle
sleeping/blocking
sleeping/waking up
wait queue
thundering herd
poll/select
Kernel Debugging
bug
debugging
debugging the kernel
binary search with git
debug support from kernel
printk syslogd, klogd, loglevels, rate limit, debug levels, debug selective subsystems
debugging by querying debugfs
oops debugging, asserting oops
Magic SysRq Key
kgdb/kdb
JTAG
Tracing
gcov
lcov
oprofile
ftrace
nop tracer
function tracer
sched switch tracer
function graph tracer
dynamic tracer
trace-cmd/kernelshark
perf
LTTng
Interrupts
interrupts vs. polling
interrupt
program sections
reentrancy
events
interrupt handler
shared interrupt handler
interrupt flow
interrupt control
Deferring Work
top/bottom halves
softirqs
tasklets
work queues
threaded interrrupts
Concurrency
critical region/section
atomic
race condition
synchronization
locking
locking solutions
deadlock
contention
what to lock?
what can be used?
atomic operations
spin locks
reader-writer spin locks
semaphore
binary semaphore
mutex
reader-writer semaphore
completion variables
sequential locks
disable preemption
orderig and barriers
Time
HZ
Jiffies
big/small delays
kernel timers
Hardware I/O
I/O Ports
I/O Memory
How to deal with side effects accessing registers?
User-Kernel Communication
put(get)_user()
copy to(from)_user()
Kernel I/O
memory mapping
procfs
sysfs
debugfs
relayfs
netlink
ioctl
Portability
word size
opaque types
signed/unsigned char
data alignment
integral promotion
code reuse
endianess
system tick
page size
instruction ordering
SMP/preemption/high memory
Except where otherwise noted content and this course outline are licensed under Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).
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