#description

This is an effort to port ucore to ARM, and keep the current x86 version work.

'ucore' is a teaching operating system used by Tsinghua University. Project homepage: [http://ucore.googlecode.com].

Currently the ARM port runs on the S3C2410X microprocessor, which is developed using an ARM920T core.

#running

A recent version of gcc should work just well. My gcc version is 4.6.0.

make TARGET_ARCH=x86 prepare
make TARGET_ARCH=x86 image

Compile for the ARM architecture:

make TARGET_ARCH=arm prepare
make TARGET_ARCH=arm image

#source code organization

• 'arch' contains architecture dependent driver and boot code.
• 'lib' contains architecture independent library code.
• 'kern' contains architecture independent kernel code.
• 'tool' contains various tools such as GDB scripts and emulator configurations.

#current status

• Simple bootloader works, which can load elf kernel from memory.
• Output to UART works. cprintf works.
• Interrupt(IRQ) works.
• PMM works.
• Slab works.

#todo

• Move kernel base to 0xC000000 from 0x3000000.
• Implement mmap.
• Draw a map of memlayout of ARM.
• Clear system stack address.
• Implement syscall.
• Input from UART.
• Swap?
• Processes.

#acknowledgment

Hail all open source software developers.

• Most code is taken from the ucore project, of course.
• Boot and interrupt code is inspired by david leels davidontech@gmail.com.
• div64 code for arm is taken from the Linux kernel.
• Software div/mode code is taken from libgcc.