.Author
Misa.Z misa.zhu@gmail.com
.About
A microkernel OS for learning operating system. versatilepb ported well, raspi2 todo....
-mmu
-multi processes
-multi thread
-ipc
-virtual fs service(everythig is a file)
-very simple ramdisk for initrd
-framebuffer device service for graphics
-uart device service
-SD card
.Environment & Tools
QEMU:
download modified qemu-4.2.0 from https://github.com/MisaZhu/qemu_raspi
./configure --enable-kvm --enable-hax --target-list=arm-softmmu
make and make install
Linux:
Ubuntu Linux 16.04 with "gcc-arm-none-eabi","gdb-arm-none-eabi","fuseext2"
installed(can install by "apt")
Mac OSX(with brew installed):
brew tap PX4/homebrew-px4
brew install gcc-arm-none-eabi-49
(set the right PATH environment after installed)
download usb to ttl driver https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
How to create/mount ext2 image in macosx
===============prepair================
brew install e2fsprogs
brew cask install osxfuse
brew install libtool
brew install autoconf
brew install automake
(download https://github.com/alperakcan/fuse-ext2)
./autogen.sh
CFLAGS="-idirafter/opt/gnu/include -idirafter/usr/local/include/osxfuse/ -idirafter/$(brew --prefix e2fsprogs)/include" LDFLAGS="-L/usr/local/opt/glib -L/usr/local/lib -L$(brew --prefix e2fsprogs)/lib" ./configure
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
make
sudo make install
=================example==============
dd if=/dev/zero of=img bs=1024 count=16384
mke2fs img
mkdir -p tmp
fuse-ext2 -o force,rw+ img tmp
(copy files)
umount ./tmp
rm -r tmp
.make and run
"cd system; make; make sd":
build EwokOS rootfs apps and sd file system.
"cd kernel; make":
build EwokOS kernel image.
"make run":
run EwokOS;
"qemu-system-arm -kernel build/EwokOS.bin -serial mon:stdio -initrd ../system/build/rootfs.img"
boot kernel file and mount initrd.
"make debug":
run EwokOS at debug server-mode.
"make gdb":
debug EwokOS (debug client-mode).
.commands
Most of commands are in 'rootfs/sbin' directory, like:
ls, ps, pwd, test ......
.Source code read-guide Tips: Don't fall in love with assembly too much;).
. Kernel init memory map
PhyMem VMem Desc
----------------------------------------------------
0x00000000 0xFFFF0000 interrupt table
0x00010000 0x80010000 Kernel start (load to)
*** *** (_init_stack, _irq_stack, _startup_page_dir)
*** *** Kernel end, Kernel PageDir Table start
+16KB +16KB Kernel PageDir Table end.
+128KB +128KB kernel malloc base
+32M +32M kernel malloc end (size=2M).
......
0x08000000 0x08000000 init ramdisk base (load initrd to)
0x08020000 0x08020000 init ramdisk end (size=2M).
......
physical ram top Share memory start base
......
MMIO_BASE_PHY MMIO_BASE MMIO base (arch)
......