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feat(arm64): port 17 integration tests from x86-64 #151

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Merged
ryanbreen merged 5 commits into from
Feb 4, 2026
Merged

feat(arm64): port 17 integration tests from x86-64 #151

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9b17f2f
feat(arm64): port 17 integration tests from x86-64
ryanbreen Feb 4, 2026
658d1b2
fix(arm64): correct test markers and thresholds
ryanbreen Feb 4, 2026
a62770b
feat(arm64): add EL0 syscall marker for test validation
ryanbreen Feb 4, 2026
4cc4236
fix(arm64): include ext2 disk in test harness for userspace testing
ryanbreen Feb 4, 2026
7182bac
fix(arm64): correct EL0 marker strings to match kernel output
ryanbreen Feb 4, 2026
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25 changes: 25 additions & 0 deletions kernel/src/arch_impl/aarch64/syscall_entry.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,24 @@ pub fn is_el0_confirmed() -> bool {
EL0_CONFIRMED.load(Ordering::Relaxed)
}

/// Emit one-time marker when first syscall from EL0 (userspace) is received.
/// Uses raw UART writes to avoid any locks (safe in syscall context).
#[inline(never)]
fn emit_el0_syscall_marker() {
// PL011 UART virtual address (physical 0x0900_0000 mapped via HHDM)
// The HHDM base is 0xFFFF_0000_0000_0000, so UART is at that + 0x0900_0000
const HHDM_BASE: u64 = 0xFFFF_0000_0000_0000;
const PL011_PHYS: u64 = 0x0900_0000;
const PL011_VIRT: u64 = HHDM_BASE + PL011_PHYS;

let msg = b"EL0_SYSCALL: First syscall from userspace (SPSR confirms EL0)\n[ OK ] syscall path verified\n";
for &byte in msg {
unsafe {
core::ptr::write_volatile(PL011_VIRT as *mut u8, byte);
}
}
}

/// Main syscall handler called from assembly.
///
/// This is the ARM64 equivalent of `rust_syscall_handler` for x86_64.
Expand All @@ -63,6 +81,13 @@ pub extern "C" fn rust_syscall_handler_aarch64(frame: &mut Aarch64ExceptionFrame
return;
}

// One-time marker for first syscall from EL0 (userspace confirmed)
// This is the ARM64 equivalent of x86_64's RING3_CONFIRMED marker
if !EL0_CONFIRMED.swap(true, Ordering::Relaxed) {
// First syscall from userspace! Print marker via raw UART (no locks)
emit_el0_syscall_marker();
}

let syscall_num = frame.syscall_number();
let arg1 = frame.arg1();
let arg2 = frame.arg2();
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