void syscall_gate() {
__asm__("SYSTEM_CALL:");
__asm__("pushl $0");
store_reg();
svc();
restore_reg();
__asm__("add $4, %esp");
iret();
}
/*
* Handle (synchronous) user traps. These are all reflected
* to the current partition, except for the hypervisor reserved
* interrupts when they are issued by the partition OS. When
* a hypervisor interrupt is generate by a partition application
* (ring 3) it is always reflected to the guest OS.
*/
void
trap(struct cpu_thread *thread, uval32 trapno)
{
uval cpl = RPL(thread->tss.srs.regs.cs);
if (likely(trapno >= BASE_HCALL_VECTOR && cpl < 3)) {
switch (trapno) {
case HCALL_VECTOR: /* hcall */
hcall(thread);
break;
case HCALL_VECTOR_IRET: /* iret */
iret(thread);
break;
default:
hprintf("%s: int 0x%ulx in reserved range - ignored\n",
__func__, trapno);
break;
}
return;
}
raise_exception(thread, trapno);
}
void do_irq_finish() {
schedule();
iret();
/* now the system is in user mode */
}
