diff options
| -rw-r--r-- | md/notes/kernel/create_sysfs_entry.md | 16 | ||||
| -rw-r--r-- | md/notes/kernel/irq_handler.md | 64 | ||||
| -rw-r--r-- | md/notes/kernel/topics.md | 27 |
3 files changed, 100 insertions, 7 deletions
diff --git a/md/notes/kernel/create_sysfs_entry.md b/md/notes/kernel/create_sysfs_entry.md new file mode 100644 index 0000000..2af3cca --- /dev/null +++ b/md/notes/kernel/create_sysfs_entry.md @@ -0,0 +1,16 @@ +title:Create sysfs entry +keywords:kernel,linux,threads + +# Create sysfs entry + +## Starting point + + +## Links + +https://man7.org/linux/man-pages/man5/sysfs.5.html +https://embetronicx.com/tutorials/linux/device-drivers/sysfs-in-linux-kernel/ +https://elixir.bootlin.com/linux/v6.1.64/source/include/linux/sysfs.h +https://docs.kernel.org/filesystems/sysfs.html + + diff --git a/md/notes/kernel/irq_handler.md b/md/notes/kernel/irq_handler.md new file mode 100644 index 0000000..a4ce3cd --- /dev/null +++ b/md/notes/kernel/irq_handler.md @@ -0,0 +1,64 @@ +title:IRQ handler +keywords:kernel,linux,irq + +# IRQ handler + +Lets extend hello world driver. + +## Starting point + +__Makefile__ +```Makefile +obj-m += procfs_entry.o + +KDIR ?= /lib/modules/$(shell uname -r)/build + +all: + make -C $(KDIR) M=$(PWD) modules + +clean: + make -C $(KDIR) M=$(PWD) clean +``` + +__procfs_entry.c__ +```c +#include <linux/module.h> /* Needed by all modules */ +#include <linux/kernel.h> + +int procfs_entry_init( void ) +{ + printk(KERN_DEBUG "Hello Procfs!\n"); + return 0; +} + +void procfs_entry_exit( void ) +{ + printk(KERN_DEBUG "Exit Procfs!\n"); +} + +module_init( procfs_entry_init ); +module_exit( procfs_entry_exit ); + +MODULE_LICENSE("GPL"); +``` + + + +## List of procfs functions used + +| Function name | Note | +|---|---| +| proc_mkdir | Create procfs directory | +| proc_create | Create procfs file | +| proc_remove | Remove procfs entry | + +## Final result + + + +## Links + + + + + diff --git a/md/notes/kernel/topics.md b/md/notes/kernel/topics.md index b959bad..86ce50c 100644 --- a/md/notes/kernel/topics.md +++ b/md/notes/kernel/topics.md @@ -3,20 +3,33 @@ keywords:blog,projects # -Linux kernel programming topics +Linux kernel programming topics, mostly for those who have some programming +experience and linux command line expertise. Making notes on all fundamental +kernel API's. ## Topic +### Basics + [Compile kernel](/writeup/compile_linux_kernel.md) [Hello world driver](/writeup/kernel_hello_world.md) -<!-- DMA programming --> -<!--[Create thread](/notes/kernel/create_thread.md) --> -<!-- Sysfs --> +[Create thread](/notes/kernel/create_thread.md) +[Sysfs](/notes/kernel/create_sysfs_entry.md) [Procfs](/notes/kernel/create_procfs_entry.md) +[User mode helpers](/notes/kernel/usermode_helper.md) + <!-- Ramfs --> -<!-- Systemcalls --> +<!-- Add new syscall --> <!-- Write files to user space --> <!-- Read files from user space --> +<!-- Create character device --> +<!-- Create netfilter firewall --> +<!-- DMA programming --> + +### Intermediate + +[Kernel /dev/hwrng](/writeup/kernel_dev_hwrng.md) <!-- Netlink --> -<!--[User mode helpers](/notes/kernel/usermode_helper.md) --> -[Kernel /dev/hwrng](/writeup/kernel_dev_hwrng.md) + +### Deep into kernel + |