ARM GIC Driver

A Rust driver for the ARM Generic Interrupt Controller (GIC), designed for bare-metal and OS kernel environments.

Features

• Multi-version Support: Compatible with GICv1, GICv2, GICv3
• Memory Safety: Written in safe Rust with zero-cost abstractions
• No Standard Library: #![no_std] compatible for embedded environments
• Type Safety: Strong typing for interrupt IDs and register access
• Comprehensive Testing: Extensive test suites for different GIC versions

Basic Usage

use arm_gic_driver::v3::*;

let mut gic = unsafe { Gic::new(0xF901_0000.into(), 0xF902_0000.into()) };
gic.init();

// Every CPU should initialize its own CPU interface
let mut cpu = gic.cpu_interface();
cpu.init_current_cpu().unwrap();

// It implements `Send` and `Sync` traits, so it can be used as static value in trap handler easily.
let trap = cpu.trap_operations();

// Enable an Timer interrupt
let irq_id = IntId::ppi(14);
gic.set_irq_enable(irq_id, true);

// Set interrupt priority
gic.set_priority(irq_id, 0x80);

// Acknowledge and handle interrupts group1
let ack = trap.ack1();
if !ack.is_special() {
    trap.eoi1(ack);
    if trap.eoi_mode() {
        trap.dir(ack);
    }
}

Architecture Support

This driver supports multiple ARM GIC versions:

• GICv1: Legacy interrupt controller
• GICv2: Supports up to 8 CPU cores
• GICv3: Scalable to many cores, supports message-based interrupts

Building

Prerequisites

• Rust nightly toolchain (specified in rust-toolchain.toml)
• QEMU (for running platform tests)

Testing

The project includes comprehensive test suites for different platforms and GIC versions:

Running Platform Tests

# Test GICv2 on AArch64
./test.sh

# Test with EL2 support
./test-el2.sh

# Test GICv3
./test_v3.sh

API Overview

Core Types

• VirtAddr: Type-safe virtual address wrapper
• IntId: Interrupt identifier with validation
• v2::Gic, v3::Gic: Version-specific GIC implementations

Examples

See the itest/ directory for comprehensive examples of using the driver in different scenarios.

Contributing

Contributions are welcome! Please ensure that:

1. All tests pass: cargo test --workspace
2. Code is properly formatted: cargo fmt
3. No clippy warnings: cargo clippy
4. Platform tests pass on relevant architectures

License

This project is licensed under the Mulan PSL v2 License. See the LICENSE file for details.