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drivers: add more descriptions for irq reg functions

This commit is contained in:
Guokai Chen 2022-05-02 17:37:28 +08:00
parent a2eb9369ec
commit f62a0a2d12
1 changed files with 45 additions and 1 deletions
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46
am/src/nemu/isa/riscv/cte.c
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@ -14,7 +14,10 @@ void __am_switch(_Context *c);
_Context* (*interrupt_handler[INTERRUPT_CAUSE_SIZE])(_Event *ev, _Context *c);
_Context* (*exception_handler[EXCEPTION_CAUSE_SIZE])(_Event *ev, _Context *c);
/*
* default handler for all possible irqs
* just panic
*/
_Context* __am_irq_default_handler(_Event *ev, _Context *c) {
printf("unregisted irq detected, scause=%d, sepc=%llx\n", c->scause, c->sepc);
ev->event = _EVENT_ERROR;
@ -22,6 +25,12 @@ _Context* __am_irq_default_handler(_Event *ev, _Context *c) {
// should never reach here
return c;
}
/*
* default handler for Supervisor Timer Interrupt
* set event to IRQ_TIMER
* may call custom timer handler if registered
*/
_Context* __am_irq_STIP_handler(_Event *ev, _Context *c) {
#if __riscv_xlen == 64
asm volatile ("csrwi sip, 0");
@ -37,6 +46,12 @@ _Context* __am_irq_STIP_handler(_Event *ev, _Context *c) {
// printf("STIP handler finished\n");
return c;
}
/*
* default handler for Supervisor External Interrupt
* set event to IEQ_IODEV
* may call custom external handler if registered
*/
_Context* __am_irq_SEIP_handler(_Event *ev, _Context *c) {
// WARNING: this has no effect since in S mode only SSIP can be cleared.
// It's not deleted because we want to test sip write mask.
@ -48,6 +63,11 @@ _Context* __am_irq_SEIP_handler(_Event *ev, _Context *c) {
return c;
}
/*
* default handler for Supervisor Ecall Exception
* set event to YIELD or SYSCALL according to a7
* may call custom secall handler if registered
*/
_Context* __am_irq_SECALL_handler(_Event *ev, _Context *c) {
ev->event = (c->GPR1 == -1) ? _EVENT_YIELD : _EVENT_SYSCALL;
c->sepc += 4;
@ -88,16 +108,35 @@ _Context* __am_irq_handle(_Context *c) {
extern void __am_asm_trap(void);
/*
* Supervisor timer interrupt custom handler register function
* handler: the function to be registered
*/
void stip_handler_reg(_Context*(*handler)(_Event, _Context*)) {
custom_timer_handler = handler;
}
/*
* Supervisor external interrupt custom handler register function
* handler: the function to be registered
*/
void seip_handler_reg(_Context*(*handler)(_Event, _Context*)) {
custom_external_handler = handler;
}
/*
* Supervisor ecall exception custom handler register function
* handler: the function to be registered
*/
void secall_handler_reg(_Context*(*handler)(_Event, _Context*)) {
custom_secall_handler = handler;
}
/*
* Generic interrupt/exception CUSTOM handler register function
* code: scause code
* handler: the function to be registered
*/
void custom_handler_reg(uintptr_t code, _Context*(*handler)(_Event, _Context*)) {
switch (code) {
#if __riscv_xlen == 64
@ -118,6 +157,11 @@ void custom_handler_reg(uintptr_t code, _Context*(*handler)(_Event, _Context*))
}
}
/*
* Generic interrupt/exception handler register function
* code: scause code
* handler: the function to be registered
*/
void irq_handler_reg(uintptr_t code, _Context*(*handler)(_Event*, _Context*)) {
uintptr_t offset = (code << 1) >> 1;
if (INTR_BIT & code) {