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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* Boot self-tests for the Trap/IRQ subsystem.
*
* Tests MD→MI translation, IrqManager register/dispatch/unregister,
* and stvec installation verification.
*/
#include <lume/types.h>
#include <lume/selftest.h>
#include <lume/trap.h>
#include <lume/irq.h>
#include <lume/errno.h>
#include <lume/console.h>
#include <arch/trap.h>
TrapCause trap_translate_scause(uint64 scause);
/* ========================================================================
* IrqManager test helpers
* ======================================================================== */
static volatile uint32 g_test_irq_fired = 0;
static volatile void* g_test_irq_arg = nullptr;
static void test_irq_handler(uint32 irq, void* arg)
{
g_test_irq_fired = irq;
g_test_irq_arg = arg;
}
/* ========================================================================
* Test cases
* ======================================================================== */
static bool test_stvec_installed() {
uint64 vec = arch::trap::get_vector();
return vec != 0;
}
static bool test_scause_exception_translation() {
/* Verify all exception causes map correctly */
bool ok = true;
ok = ok && (trap_translate_scause(EXC_LOAD_PAGE_FAULT) == TrapCause::PageFaultLoad);
ok = ok && (trap_translate_scause(EXC_STORE_PAGE_FAULT) == TrapCause::PageFaultStore);
ok = ok && (trap_translate_scause(EXC_INST_PAGE_FAULT) == TrapCause::PageFaultExec);
ok = ok && (trap_translate_scause(EXC_ECALL_FROM_U) == TrapCause::Syscall);
ok = ok && (trap_translate_scause(EXC_ILLEGAL_INST) == TrapCause::IllegalInst);
ok = ok && (trap_translate_scause(EXC_BREAKPOINT) == TrapCause::Breakpoint);
ok = ok && (trap_translate_scause(EXC_LOAD_ACCESS_FAULT) == TrapCause::AccessFault);
ok = ok && (trap_translate_scause(EXC_INST_MISALIGNED) == TrapCause::AlignFault);
return ok;
}
static bool test_scause_interrupt_translation() {
bool ok = true;
ok = ok && (trap_translate_scause(SCAUSE_INTERRUPT | IRQ_S_TIMER) == TrapCause::IrqTimer);
ok = ok && (trap_translate_scause(SCAUSE_INTERRUPT | IRQ_S_SOFTWARE) == TrapCause::IrqSoftware);
ok = ok && (trap_translate_scause(SCAUSE_INTERRUPT | IRQ_S_EXTERNAL) == TrapCause::IrqExternal);
ok = ok && (trap_translate_scause(SCAUSE_INTERRUPT | 99) == TrapCause::Unknown);
return ok;
}
static bool test_scause_unknown() {
/* ecall from S-mode should map to Unknown (we only handle U-mode ecall) */
return trap_translate_scause(EXC_ECALL_FROM_S) == TrapCause::Unknown;
}
static bool test_irqmanager_register_dispatch() {
IrqManager mgr;
mgr.init();
g_test_irq_fired = 0;
g_test_irq_arg = nullptr;
int dummy_arg = 42;
int ret = mgr.register_handler(10, test_irq_handler, &dummy_arg);
if (ret != 0) return false;
/* Dispatch IRQ 10 — handler should be called */
mgr.dispatch(10);
if (g_test_irq_fired != 10) return false;
if (g_test_irq_arg != &dummy_arg) return false;
return true;
}
static bool test_irqmanager_unregister() {
IrqManager mgr;
mgr.init();
g_test_irq_fired = 0;
mgr.register_handler(5, test_irq_handler, nullptr);
mgr.unregister_handler(5);
/* Dispatch after unregister — handler should NOT be called */
mgr.dispatch(5);
return g_test_irq_fired == 0;
}
static bool test_irqmanager_double_register() {
IrqManager mgr;
mgr.init();
int ret1 = mgr.register_handler(7, test_irq_handler, nullptr);
int ret2 = mgr.register_handler(7, test_irq_handler, nullptr);
return ret1 == 0 && ret2 == -EBUSY;
}
static bool test_irqmanager_invalid_irq() {
IrqManager mgr;
mgr.init();
int ret = mgr.register_handler(999, test_irq_handler, nullptr);
return ret == -EINVAL;
}
static bool test_irqmanager_has_handler() {
IrqManager mgr;
mgr.init();
if (mgr.has_handler(10)) return false; /* not yet registered */
mgr.register_handler(10, test_irq_handler, nullptr);
if (!mgr.has_handler(10)) return false; /* now registered */
mgr.unregister_handler(10);
if (mgr.has_handler(10)) return false; /* unregistered */
return true;
}
static bool test_irqmanager_spurious_dispatch() {
IrqManager mgr;
mgr.init();
g_test_irq_fired = 0;
/* Dispatch an unregistered IRQ — should not crash or fire */
mgr.dispatch(0);
mgr.dispatch(63);
return g_test_irq_fired == 0;
}
/* ========================================================================
* Test runner
* ======================================================================== */
void selftest_trap()
{
st_begin("trap: stvec is installed");
ST_ASSERT(test_stvec_installed());
st_pass();
st_begin("trap: scause exception translation");
ST_ASSERT(test_scause_exception_translation());
st_pass();
st_begin("trap: scause interrupt translation");
ST_ASSERT(test_scause_interrupt_translation());
st_pass();
st_begin("trap: scause unknown (ecall from S)");
ST_ASSERT(test_scause_unknown());
st_pass();
st_begin("trap: IrqManager register/dispatch");
ST_ASSERT(test_irqmanager_register_dispatch());
st_pass();
st_begin("trap: IrqManager unregister");
ST_ASSERT(test_irqmanager_unregister());
st_pass();
st_begin("trap: IrqManager double register");
ST_ASSERT(test_irqmanager_double_register());
st_pass();
st_begin("trap: IrqManager invalid IRQ");
ST_ASSERT(test_irqmanager_invalid_irq());
st_pass();
st_begin("trap: IrqManager has_handler");
ST_ASSERT(test_irqmanager_has_handler());
st_pass();
st_begin("trap: IrqManager spurious dispatch");
ST_ASSERT(test_irqmanager_spurious_dispatch());
st_pass();
}
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