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03 module task #119

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03 module task #119

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20139aa
SIMPLEMODULE: Add Makefile and source file
marynamalakhova Mar 16, 2021
24c6a2a
SIMPLEMODULE: Add module init parameter
marynamalakhova Mar 16, 2021
8557dc5
SIMPLEMODULE: Improve param value
marynamalakhova Mar 16, 2021
da90cc1
SIMPLEMODULE: Add log
marynamalakhova Mar 16, 2021
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7 changes: 7 additions & 0 deletions 03_module/simple_module/Makefile
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
TARGET = msimplemodule
obj-m += $(TARGET).o
default:
$(MAKE) -C $(BUILD_KERNEL) M=$(CURDIR) modules

clean:
$(MAKE) -C $(BUILD_KERNEL) M=$(CURDIR) clean
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Makefile expects BUILD_KERNEL being defined in environment,
but neither code, nor commit message don't explain this.

51 changes: 51 additions & 0 deletions 03_module/simple_module/log.txt
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/mnt # uname -a
Linux (none) 4.19.176 #4 SMP Tue Mar 16 12:55:37 EET 2021 armv7l GNU/Linux
/mnt # lsmod
/mnt # insmod msimplemodule.ko
[ 400.031994] simple module: iparam = -1
insmod: can't insert 'msimplemodule.ko': Operation not permitted
/mnt #
/mnt #
/mnt #
/mnt # dmesg -c
[ 400.031994] simple module: iparam = -1
/mnt #
/mnt # lsmod
/mnt #
/mnt #
/mnt # insmod msimplemodule.ko iparam=0
[ 477.652962] simple module: iparam = 0
/mnt # dmesg -c
[ 477.652962] simple module: iparam = 0
/mnt #
/mnt #
/mnt # lsmod
msimplemodule 16384 0 - Live 0xbf020000 (O)
/mnt # rmmod msimplemodule.ko
/mnt # insmod msimplemodule.ko iparam=1
[ 498.952910] simple module: iparam = 1
insmod: can't insert 'msimplemodule.ko': Operation not permitted
/mnt #
/mnt #
/mnt #
/mnt # lsmod
/mnt # dmesg -c
[ 498.952910] simple module: iparam = 1
/mnt # insmod msimplemodule.ko iparam=-1
[ 518.104298] simple module: iparam = -1
insmod: can't insert 'msimplemodule.ko': Operation not permitted
/mnt # dmesg -c
[ 518.104298] simple module: iparam = -1
/mnt #
/mnt #
/mnt # lsmod
/mnt # insmod msimplemodule.ko iparam=0
[ 531.005574] simple module: iparam = 0
/mnt #
/mnt #
/mnt #
/mnt # lsmod
msimplemodule 16384 0 - Live 0xbf038000 (O)
/mnt # dmesg
[ 531.005574] simple module: iparam = 0
/mnt # rmmod msimplemodule.ko
31 changes: 31 additions & 0 deletions 03_module/simple_module/msimplemodule.c
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// SPDX-License-Identifier: GPL-3.0
#define pr_fmt(fmt) "%s: " fmt, KBUILD_MODNAME
#include <linux/init.h> // Macros used to mark up functions __init __exit
#include <linux/module.h> // Core header for loading LKMs into the kernel
#include <linux/kernel.h> // Contains types, macros, functions for the kernel
#include <linux/moduleparam.h>

static int iparam = -1;
module_param(iparam, int, 0);

static int __init hello_init(void)
{
pr_debug("loading started\n");
pr_info("iparam = %d\n", iparam);
iparam = iparam > 0 ? -iparam : iparam;
return iparam;
}

static void __exit hello_exit(void)
{
pr_debug("module exits\n");
}


module_init(hello_init);
module_exit(hello_exit);

MODULE_AUTHOR("Malakhova.Maryna <[email protected]>");
MODULE_DESCRIPTION("Simple Kernel module");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");