LC

Implement Memory-Mapped I/O: Map Address to Print Character

medium4/10

Add Register File: 8 General-Purpose Registers Add Branch Instructions: JMP, JEQ, JGT

Language

Compiler

2.0s Limit 256MB

Implementation

Implement memory-mapped I/O for character output.

Requirements:

Define I/O memory map (UART at specific address)
Implement special handling for I/O addresses
Intercept writes to UART transmit address
Print character when written to UART
Implement status register (ready bit)
Test memory-mapped output
Show character printing

Why This Matters

Memory-mapped I/O is exactly how Linux device drivers talk to hardware: ioremap() maps a peripheral's registers into kernel address space so a driver can use ordinary loads and stores, and it's how the Raspberry Pi's BCM2835 GPIO controller and UART are programmed from bare-metal code. Getting the address decoding wrong is a real class of driver bug that corrupts hardware state instead of just memory.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0