kỹ thuật điện hệ điều hành os+thí nghiệm +build+kernel+pub sinhvienzone com

Prepare for disaster!2 SinhVienZone.com https://fb.com/sinhvienzonevn... Compile Kernel, the Ubuntu ways4 SinhVienZone.com https://fb.com/sinhvienzonevn... Tools & source code $sudo apt

BUILD LINUX KERNEL

Based on EPFL assignment

2015

Prepare for disaster!

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Ubuntu 12.04 in Virtual Box

Compile Kernel, the Ubuntu ways

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 https://www.youtube.com/watch?v=Wm3-lBW8o4s

 https://www.youtube.com/watch?v=cc8082h0fS0

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Tools & source code

 $sudo apt-get install dpkg-dev git

 $sudo apt-get build-dep linux-image-$(uname -r)

 $git clone precise.git

Verify and checkout

 $cd ubuntu-precise

 $git tag -l Ubuntu-lts-3.11*

 $git checkout -b os_assignment_1 15.25

Ubuntu-lts-3.11.0-7

 $sudo apt-get install fakeroot

 $sudo fakeroot debian/rules clean

 $sudo fakeroot debian/rules headers generic

binary-8

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Tips on recompile process

 $sudo apt-get install ccache

 $ls /*.deb

 15.25~precise1_amd64.deb

/linux-headers-3.11.0-15-generic_3.11.0- 15.25~precise1_amd64.deb

/linux-image-3.11.0-15-generic_3.11.0- 15.25~precise1_amd64.deb

/linux-tools-3.11.0-15-generic_3.11.0-10

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Load new kernel

 $sudo dpkg -i *.deb

 $sudo reboot

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 $uname -a

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Compile kernel, geeky ways

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Get kernel source

 $uname –a

 $wget 3.11.5.tar.xz

https://www.kernel.org/pub/linux/kernel/v3.x/linux- $tar xjvf 3.11.5.tar.xz

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 $sudo apt-get install ncurses-dev

 Ncurse: toolkit for developing "GUI-like" application software that runs under a terminal emulator.

 $sudo make menuconfig

 (Use old config: sudo make oldconfig)

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Here it is!

 # reboot

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Add system call

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Your first system call!

 Return a system wide unique identier each time it is called

 sys_get_unique_id (int * uuid )

 uuid: location to store the unique identifier after the call

 return:

 0 for success

 (minus) error code otherwise

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System call list

Header file

 include/linux/syscalls.h

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Source code

 get_unique_id.c:

# include < linux / linkage h>

asmlinkage long sys_get_unique_id (int * uuid ) {

// your code }

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Change Makefile

 obj-y =

 get_unique_id.o

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long get_unique_id ( int* uuid ) {

return syscall ( NR_get_unique_id , uuid ) ? errno : 0; }

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Test (cont.)

int main () {

int uuid ; int res;

res = get_unique_id (& uuid );

printf (" Syscall returned %d, uuid is %d\n", res , uuid ); res = get_unique_id (& uuid );

printf (" Syscall returned %d, uuid is %d\n", res , uuid ); res = get_unique_id (47424742); // arbitrary memory address

printf (" Syscall returned %d\n", res );

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