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amic: improve VIA2_IFR and VIA2_IER emulation.

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This commit is contained in:
Maxim Poliakovski 2023-11-01 16:14:57 +01:00
parent ae903082d8
commit 58dacfa263
1 changed files with 8 additions and 4 deletions
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12
devices/ioctrl/amic.cpp
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@ -282,10 +282,13 @@ void AMIC::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
}
break;
case AMICReg::VIA2_IFR:
// for each "1" in value clear the corresponding IRQ bit
// TODO: is bit 7 read only?
this->via2_ifr &= ~(value & 0x7F);
this->update_via2_irq();
// if bit 7 is set, clear the corresponding IRQ bit for each "1" in value
if (value & 0x80) {
this->via2_ifr &= ~(value & 0x7F);
this->update_via2_irq();
} else { // writing any value to VIA2_IFR with bit 7 cleared has no effect
LOG_F(WARNING, "%s: bit 7 of VIA2_IFR is cleared!", this->name.c_str());
}
break;
case AMICReg::VIA2_Slot_IER:
if (value & 0x80)
@ -300,6 +303,7 @@ void AMIC::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
} else {
this->via2_ier &= ~value;
}
this->update_via2_irq();
break;
case AMICReg::Ariel_Clut_Index:
this->def_vid->set_clut_index(value);