Low level assumptions in `asmc`

This is a (currently incomplete and informal) list of things asmc currently assumes on the underlying computing platform.

Processor

An x86 CPU which implements at least the following features and instructions.

Standard stuff used all over

CPU capable of running in 32 bit protected mode with flat segmenting, no paging and disabled interrupts.
Stack manipulation instructions: push, pop
Arithmetic instructions: mov, add, sub, cmp, mul, div, neg
Bit manipulation instructions: and, or, xor, not, shl, shr, sar, test
Control flow instructions: near call, near ret, near jmp, jcc, hlt
IO instructions: in, out

Boot loader

CPU capable of running in 16 bit real mode.
Segmenting instructions: mov to segment, far jump, lgdt
Interrupt instructions: int, cli

Kernel and G compiler

G compiler generated code

Arithmetic instructions: lea, idiv, imul, cdq

64 bit numbers support

Firmware

A standard-ish BIOS interface.

Devices

A standard disk controller accessible through its ATA PIO mode interface on ports 0x1f0-0x1f7.