/* Process the current interrupt if there is one. This operation must
be called after each instruction to handle the interrupts. If interrupts
are masked, it does nothing. */
int
interrupts_process (struct interrupts *interrupts)
{
int id;
uint8 ccr;
/* See if interrupts are enabled/disabled and keep track of the
number of cycles the interrupts are masked. Such information is
then reported by the info command. */
ccr = cpu_get_ccr (interrupts->cpu);
if (ccr & M6811_I_BIT)
{
if (interrupts->start_mask_cycle < 0)
interrupts->start_mask_cycle = cpu_current_cycle (interrupts->cpu);
}
else if (interrupts->start_mask_cycle >= 0
&& (ccr & M6811_I_BIT) == 0)
{
signed64 t = cpu_current_cycle (interrupts->cpu);
t -= interrupts->start_mask_cycle;
if (t < interrupts->min_mask_cycles)
interrupts->min_mask_cycles = t;
if (t > interrupts->max_mask_cycles)
interrupts->max_mask_cycles = t;
interrupts->start_mask_cycle = -1;
interrupts->last_mask_cycles = t;
}
if (ccr & M6811_X_BIT)
{
if (interrupts->xirq_start_mask_cycle < 0)
interrupts->xirq_start_mask_cycle
= cpu_current_cycle (interrupts->cpu);
}
else if (interrupts->xirq_start_mask_cycle >= 0
&& (ccr & M6811_X_BIT) == 0)
{
signed64 t = cpu_current_cycle (interrupts->cpu);
t -= interrupts->xirq_start_mask_cycle;
if (t < interrupts->xirq_min_mask_cycles)
interrupts->xirq_min_mask_cycles = t;
if (t > interrupts->xirq_max_mask_cycles)
interrupts->xirq_max_mask_cycles = t;
interrupts->xirq_start_mask_cycle = -1;
interrupts->xirq_last_mask_cycles = t;
}
id = interrupts_get_current (interrupts);
if (id >= 0)
{
uint16 addr;
struct interrupt_history *h;
/* Implement the breakpoint-on-interrupt. */
if (interrupts->interrupts[id].stop_mode & SIM_STOP_WHEN_TAKEN)
{
sim_io_printf (CPU_STATE (interrupts->cpu),
"Interrupt %s will be handled\n",
interrupt_names[id]);
sim_engine_halt (CPU_STATE (interrupts->cpu),
interrupts->cpu,
0, cpu_get_pc (interrupts->cpu),
sim_stopped,
SIM_SIGTRAP);
}
cpu_push_all (interrupts->cpu);
addr = memory_read16 (interrupts->cpu,
interrupts->vectors_addr + id * 2);
cpu_call (interrupts->cpu, addr);
/* Now, protect from nested interrupts. */
if (id == M6811_INT_XIRQ)
{
cpu_set_ccr_X (interrupts->cpu, 1);
}
else
{
cpu_set_ccr_I (interrupts->cpu, 1);
}
/* Update the interrupt history table. */
h = &interrupts->interrupts_history[interrupts->history_index];
h->type = id;
h->taken_cycle = cpu_current_cycle (interrupts->cpu);
h->raised_cycle = interrupts->interrupts[id].cpu_cycle;
if (interrupts->history_index >= MAX_INT_HISTORY-1)
interrupts->history_index = 0;
else
interrupts->history_index++;
interrupts->nb_interrupts_raised++;
cpu_add_cycles (interrupts->cpu, 14);
return 1;
}
return 0;
}
/* Process the current interrupt if there is one. This operation must
be called after each instruction to handle the interrupts. If interrupts
are masked, it does nothing. */
int
interrupts_process (struct interrupts *interrupts)
{
int id;
uint8 ccr;
/* See if interrupts are enabled/disabled and keep track of the
number of cycles the interrupts are masked. Such information is
then reported by the info command. */
ccr = cpu_get_ccr (interrupts->cpu);
if (ccr & M6811_I_BIT)
{
if (interrupts->start_mask_cycle < 0)
interrupts->start_mask_cycle = cpu_current_cycle (interrupts->cpu);
}
else if (interrupts->start_mask_cycle >= 0
&& (ccr & M6811_I_BIT) == 0)
{
signed64 t = cpu_current_cycle (interrupts->cpu);
t -= interrupts->start_mask_cycle;
if (t < interrupts->min_mask_cycles)
interrupts->min_mask_cycles = t;
if (t > interrupts->max_mask_cycles)
interrupts->max_mask_cycles = t;
interrupts->start_mask_cycle = -1;
interrupts->last_mask_cycles = t;
}
if (ccr & M6811_X_BIT)
{
if (interrupts->xirq_start_mask_cycle < 0)
interrupts->xirq_start_mask_cycle
= cpu_current_cycle (interrupts->cpu);
}
else if (interrupts->xirq_start_mask_cycle >= 0
&& (ccr & M6811_X_BIT) == 0)
{
signed64 t = cpu_current_cycle (interrupts->cpu);
t -= interrupts->xirq_start_mask_cycle;
if (t < interrupts->xirq_min_mask_cycles)
interrupts->xirq_min_mask_cycles = t;
if (t > interrupts->xirq_max_mask_cycles)
interrupts->xirq_max_mask_cycles = t;
interrupts->xirq_start_mask_cycle = -1;
interrupts->xirq_last_mask_cycles = t;
}
id = interrupts_get_current (interrupts);
if (id >= 0)
{
uint16 addr;
cpu_push_all (interrupts->cpu);
addr = memory_read16 (interrupts->cpu,
interrupts->vectors_addr + id * 2);
cpu_call (interrupts->cpu, addr);
/* Now, protect from nested interrupts. */
if (id == M6811_INT_XIRQ)
{
cpu_set_ccr_X (interrupts->cpu, 1);
}
else
{
cpu_set_ccr_I (interrupts->cpu, 1);
}
interrupts->nb_interrupts_raised++;
cpu_add_cycles (interrupts->cpu, 14);
return 1;
}
return 0;
}