Very simple KVM based hypervisor. Runs your code and nothing more.
System requirements:
- x86_64 CPU with virtualization support
- GNU/Linux with recent enough kernel
- gcc, nasm and cmake for building
Usage: blankvm [-RPL] [-m mem_size] [-e entry] [-p page_table] image
-R real mode (16-bit)
-P protected mode (32-bit)
-L long mode (64-bit)
-m memory size
-e entry point address
-p page table address (only for long mode)
Examples:
blankvm -R test16.bin
blankvm -P test32.bin
blankvm -L test64.bin
Image is always loaded at physical address 0.
For real mode segment registers are set to 0. For protected mode segments are tuned to base=0, limit=0xFFFFFFFF. Values of other registers are unspecified.
Long mode requires a page table. Page table with 1:1 mapping is generated automatically.
If you need different mapping, you can add table to the image and specify its address with -p option.
Virtual serial port is mapped to 0x3F8 and linked to the stdin and stdout.