iotguru / BareMetal-OS

Build scripts for BareMetal OS and its related utilities

BareMetal OS build scripts

The easiest way to create a BareMetal OS build environment. These scripts will download and compile all of the components needed for using BareMetal OS.

Prerequisites

NASM (Assembly compiler) is required to build the loader and OS, as well as the apps writen in Assembly. QEMU (computer emulator) is required if you plan on running the OS for quick testing. GCC (C compiler) is required for building the BMFS disk utility, the C applications, as well as Newlib. Git is used for pulling the software from GitHub. FreeType is used for rendering the font glyphs in Alloy.

In Ubuntu this can be completed with the following command:

sudo apt-get install nasm qemu gcc git libfreetype6-dev

There are additional dependencies if you are planning on compiling Newlib. They can be installed with the following command:

sudo apt-get install autoconf automake libtool sed gawk bison flex m4 texinfo texi2html unzip make

Initial configuration

git clone https://github.com/ReturnInfinity/BareMetal-OS.git
cd BareMetal-OS
./setup.sh

setup.sh automatically runs build, format, and install

Rebuilding the source code

./build.sh

Installing to the disk image

./install.sh

Test the install with QEMU

./run.sh

Test the install with Bochs

Bochs does not support SATA drives so this is only useful for debugging the kernel. Make sure bochs and bochs-x are installed.

bochs -f bochs.cfg

Build a VMDK disk image for VMware

./vmdk.sh

Build a VDI disk image for VirtualBox

./vdi.sh

The VDI script rewrites the disk ID with the contents of VDI_UUID.bin to avoid the disk warning in VirtualBox.

Build the project using GNU Make

git submodule update --init --recursive
make

Programs in Assembly

Automatic:

./app.sh sysinfo.asm
./run.sh

With GNU Make:

make sysinfo.app

Manual:

cd src/Coreutils/
nasm sysinfo.asm -o ../../bin/sysinfo.app
cd ../../bin
./bmfs bmfs.image create sysinfo.app 2
./bmfs bmfs.image write sysinfo.app
cd ..
./run.sh

BareMetal OS should be running in the QEMU virtual machine and you should see a '>' prompt. You can now run the application by typing

sysinfo.app

Programs in C

C programs can be compiled to take advantage of the BareMetal system calls. Standard ANSI C calls are available via Newlib (see the Newlib section below).

Automatic:

./app.sh hello-c.c
./run.sh

With GNU Make:

make hello-c.app

Manual (will not work with standard C library):

gcc -c -m64 -nostdlib -nostartfiles -nodefaultlibs -fomit-frame-pointer -mno-red-zone -o bin/program.o program.c
ld -T src/Coreutils/coreutil.ld -o bin/program.app bin/program.o
cd bin
./bmfs bmfs.image create program.app 2
./bmfs bmfs.image write program.app
cd ..
./run.sh

BareMetal OS should be running in the QEMU virtual machine and you should see a '>' prompt. You can now run the application by typing

program.app

Compiling Newlib

./newlib.sh

The Newlib script will build the Newlib library and also compile a test application (test.app) to verify the build process.

The test application can also be built manually:

cd newlib
gcc -I newlib-2.4.0/newlib/libc/include/ -c test.c -o test.o
ld -T app.ld -o test.app crt0.o test.o libc.a
cp test.app ../bin
cd ../bin
./bmfs bmfs.image create test.app 2
./bmfs bmfs.image write test.app
cd ..
./run.sh

BareMetal OS should be running in the QEMU virtual machine and you should see a '>' prompt. You can now run the application by typing

test.app