diff options
Diffstat (limited to 'sim/m68hc11/interrupts.c')
| -rw-r--r-- | sim/m68hc11/interrupts.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/sim/m68hc11/interrupts.c b/sim/m68hc11/interrupts.c index 655c400..44771bb 100644 --- a/sim/m68hc11/interrupts.c +++ b/sim/m68hc11/interrupts.c @@ -102,13 +102,21 @@ interrupts_update_pending (struct interrupts *interrupts) { data = ioregs[idef->enable_paddr]; if (!(data & idef->enabled_mask)) - continue; + { + /* Disable it. */ + interrupts->pending_mask &= ~(1 << idef->int_number); + continue; + } } /* Interrupt is enabled, see if it's there. */ data = ioregs[idef->int_paddr]; if (!(data & idef->int_mask)) - continue; + { + /* Disable it. */ + interrupts->pending_mask &= ~(1 << idef->int_number); + continue; + } /* Ok, raise it. */ interrupts->pending_mask |= (1 << idef->int_number); @@ -159,14 +167,17 @@ interrupts_get_current (struct interrupts *interrupts) } /* Returns the first interrupt number which is pending. - The interrupt priority is specified by the table `interrupt_order'. */ + The interrupt priority is specified by the table `interrupt_order'. + For these interrupts, the pending mask is cleared when the program + performs some actions on the corresponding device. If the device + is not reset, the interrupt remains and will be re-raised when + we return from the interrupt (see 68HC11 pink book). */ for (i = 0; i < M6811_INT_NUMBER; i++) { enum M6811_INT int_number = interrupts->interrupt_order[i]; if (interrupts->pending_mask & (1 << int_number)) { - interrupts->pending_mask &= ~(1 << int_number); return int_number; } } |