The RAM Management

How much RAM do we have?

Qemu is a virtual environment... meaning we get to define how much RAM our machine has. We are humble and efficient... so we choose 128 MBs only... right?

The RAM that we are dealing with is only 128 MBs as specified in our Qemu configuration : You can see a " -m 128M" setting in the build and run Config file :

[target.riscv64gc-unknown-none-elf]
runner = "qemu-system-riscv64 -machine virt -cpu rv64 -d guest_errors,unimp -smp 4 -m 128M -drive if=none,format=raw,file=hdd.dsk,id=foo -device virtio-blk-device,scsi=off,drive=foo -serial mon:stdio -bios none -device virtio-rng-device -device virtio-gpu-device -device virtio-net-device -device virtio-tablet-device -device virtio-keyboard-device  -kernel "

If you want to add more RAM, go ahead... so wasteful... look at you.

How will we manage the RAM ?

To manage the RAM we need to do the following tasks well. Really well:

1. Safely Abstracting the physical memory, so that we can manipulate it.
2. Define methods of correctly allocating memory.
3. Define methods of correctly deallocating memory.
4. Defining mechanisms that make sure that programs only access the correct memory sections.
5. Provide a clean API for all of the above functions