Linux Device Drivers - Communicating with Hardware
Linux Kernel Programming for IO Mapped and Memory Mapped devices
- Descrição
- Currículo
- FAQ
- Revisões
Tempo de leitura less than a minute
What you will learn in this course:
-
Two modes of communication with hardware – IO Mapped IO and Memory Mapped IO
-
Kernel Drivers/Modules for IO Mapped IO – Speaker, RTC, Keyboard
-
Kernel Drivers/Modules for Memory Mapped IO – Hardware Random Generator, GPIO, UART
-
Accessing IO Mapped IO and Memory Mapped IO from user space
-
PCI and SMBIOS
API’s/Macros/Structures
-
inb, outb, inw, outw, inl, outl
-
inb_p, outb_p, inw_p, outw_p, inl_p, outl_p
-
struct resource, request_region, release_region
-
ioperm, iopl, geteuid
-
request_mem_region, release_mem_region, ioremap, iounmap, ioread8, ioread16, ioread32, iowrite8, iowrite16, iowrite32
-
ioport_map, ioport_unmap,mmap
Files:
/dev/port, /dev/mem, /proc/iomem, /proc/ioports
Commands
-
hwclock
-
date
-
showkey
-
hexdump
-
strings
-
dd
-
lspci
-
biosdecode
-
dmidecode
IO Mapped IO
RTC
-
4
X86 I/O ports -
5
Accessing I/O Ports
-
6
Requesting I/O Ports
-
7
Linux Kernel Module Example for requesting i/o ports
-
8
Why read value is not same as write
-
9
Why all ports are not listed in /proc/ioports
-
10
Where to find information of processor ioports
-
11
Linux Kernel Module to enable the Speaker
-
12
Ports list
Keyboard
User Space IO Access
-
20
Introduction to PC Keyboard
-
21
Scancodes
-
22
How to find out scancode of a key
-
23
Typematic
-
24
Reset Command
-
25
I/O Ports of keyboard
-
26
Linux Kernel Module sending keyboard controller commands
-
27
Linux Kernel Module Enabling and Disabling mouse
-
28
Linux Kernel Module Enabling and Disabling keyboard
-
29
Linux Kernel Module reading command byte after disabling keyboard
-
30
Status Register
-
31
Linux Kernel Module to print keys typed
-
32
Linux Kernel Module to turn on keyboard leds
Memory Mapped IO
-
33
Introduction
-
34
ioperm system call
-
35
Add an error message to normal user
-
36
What happens when you dont call ioperm and access IO Ports from userspace
-
37
Accessing RTC Registers from user space
-
38
iopl
-
39
Accessing RTC Registers after iopl
-
40
Pushing keys from user space process
-
41
Restart Your Computer using keyboard port
-
42
Restart Your Computer using Reset PCI Port
-
43
Enabling and Disabling speaker
-
44
8254 Timers and speakers
-
45
/dev/port
SMBIOS
-
46
Introduction
-
47
Requesting IO Memory
-
48
Accessing IO Memory
-
49
Why cant we directly access IO memory
-
50
Linux Kernel Module example calling request mem region failed case
-
51
Linux Kernel Module example calling request mem region success case
-
52
Linux Kernel Module example calling ioremap and iounmap
-
53
Linux Kernel Module example writing to memory
-
54
Linux Kernel Module example calling ioread and iowrite
-
55
Hardware Random Number Generator
-
56
Registers in Hardware Random Number Generator
-
57
Ports access as IO Memory
-
58
Accessing memory mapped io from user space
-
59
CONFIG_STRICT_DEVMEM
-
60
devmem utility
-
61
Simple implementation of devmem utility in c
-
62
Updated code to print string
-
63
Configure GPIO using devmem
-
64
RTC on qemu arm
-
65
Dump BIOS data on file
-
66
Writing string into RAM and reading back
PCI
Notes
-
72
Introduction
-
73
PCI Address Space
-
74
PCI Configuration Space
-
75
How to access registers in PCI Configuration Space
-
76
lspci
-
77
Access configuration address space from Linux Kernel Module
-
78
Linux Kernel Module to print full address space
-
79
What happens when we try to read a device which doesnt exist
-
80
Base Address Registers
-
81
Base Address of Base Address Register
-
82
Find out amount of memory consumed by PCI Device
-
83
Introduction to PCI Express
How long do I have access to the course materials?
You can view and review the lecture materials indefinitely, like an on-demand channel.
Can I take my courses with me wherever I go?
Definitely! If you have an internet connection, courses on Udemy are available on any device at any time. If you don't have an internet connection, some instructors also let their students download course lectures. That's up to the instructor though, so make sure you get on their good side!
Estrelas 5
41
Estrelas 4
46
Estrelas 3
21
Estrelas 2
13
Estrelas 1
4
Course details
Vídeo
3 hours
Sessões de Formação
1
Certificate of Completion
Popular courses
