static void t11_set_context(void *src)
{
if (src)
t11 = *(t11_Regs *)src;
change_pc(PC);
t11_check_irqs();
}
static CPU_EXECUTE( t11 )
{
t11_state *cpustate = get_safe_token(device);
t11_check_irqs(cpustate);
if (cpustate->wait_state)
{
cpustate->icount = 0;
goto getout;
}
do
{
UINT16 op;
cpustate->ppc = cpustate->reg[7]; /* copy PC to previous PC */
debugger_instruction_hook(device, cpustate->PCD);
op = ROPCODE(cpustate);
(*opcode_table[op >> 3])(cpustate, op);
} while (cpustate->icount > 0);
getout:
;
}
static void set_irq_line(int irqline, int state)
{
/* set the appropriate bit */
if (state == CLEAR_LINE)
t11.irq_state &= ~(1 << irqline);
else
t11.irq_state |= 1 << irqline;
/* recheck for interrupts */
t11_check_irqs();
}
static void t11_check_irqs(void)
{
const struct irq_table_entry *irq = &irq_table[t11.irq_state & 15];
int priority = PSW & 0xe0;
/* compare the priority of the interrupt to the PSW */
if (irq->priority > priority)
{
int vector = irq->vector;
int new_pc, new_psw;
/* call the callback; if we don't get -1 back, use the return value as our vector */
if (t11.irq_callback != NULL)
{
int new_vector = (*t11.irq_callback)(t11.irq_state & 15);
if (new_vector != -1)
vector = new_vector;
}
/* fetch the new PC and PSW from that vector */
assert((vector & 3) == 0);
new_pc = RWORD(vector);
new_psw = RWORD(vector + 2);
/* push the old state, set the new one */
PUSH(PSW);
PUSH(PC);
PCD = new_pc;
PSW = new_psw;
change_pc(PC);
t11_check_irqs();
/* count cycles and clear the WAIT flag */
t11.interrupt_cycles += 114;
t11.wait_state = 0;
}
}
static void t11_check_irqs(t11_state *cpustate)
{
const struct irq_table_entry *irq = &irq_table[cpustate->irq_state & 15];
int priority = cpustate->PSW & 0xe0;
/* compare the priority of the interrupt to the PSW */
if (irq->priority > priority)
{
int vector = irq->vector;
int new_pc, new_psw;
/* call the callback; if we don't get -1 back, use the return value as our vector */
if (cpustate->irq_callback != NULL)
{
int new_vector = (*cpustate->irq_callback)(cpustate->device, cpustate->irq_state & 15);
if (new_vector != -1)
vector = new_vector;
}
/* fetch the new PC and PSW from that vector */
assert((vector & 3) == 0);
new_pc = RWORD(cpustate, vector);
new_psw = RWORD(cpustate, vector + 2);
/* push the old state, set the new one */
PUSH(cpustate, cpustate->PSW);
PUSH(cpustate, cpustate->PC);
cpustate->PCD = new_pc;
cpustate->PSW = new_psw;
t11_check_irqs(cpustate);
/* count cycles and clear the WAIT flag */
cpustate->icount -= 114;
cpustate->wait_state = 0;
}
}
