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Emulator: Implement DI/EI opcodes, finish RETI opcode

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Riyyi
2022-09-02 22:44:24 +02:00
parent 5b4dbdc9a4
commit cd2673909c
1 changed files with 16 additions and 3 deletions
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src/cpu.cpp
+16 -3
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@@ -127,8 +127,6 @@ void CPU::update()
switch (opcode) {
case 0x10: /* TODO */ m_pc += 2; break;
case 0xf3: /* TODO */ m_pc += 1; break;
case 0xfb: /* TODO */ m_pc += 1; break;
case 0x00: nop(); break;
case 0x01: ldi16(); break;
@@ -363,12 +361,14 @@ void CPU::update()
case 0xf0: ldff8(); break;
case 0xf1: pop(); break;
case 0xf2: ldff8(); break;
case 0xf3: misc(); break;
case 0xf5: push(); break;
case 0xf6: or8(); break;
case 0xf7: rst(); break;
case 0xf8: ldr16(); break;
case 0xf9: ldr16(); break;
case 0xfa: lda8(); break;
case 0xfb: misc(); break;
case 0xfe: cp(); break;
case 0xff: rst(); break;
@@ -1601,8 +1601,8 @@ void CPU::ret()
case 0xd8: /* RET C,i16 */ function_return(m_cf); break;
case 0xd9: /* RETI */ {
// Return from subroutine
// TODO: and enable interrupts.
function_return(true);
m_ime = true;
break;
}
default:
@@ -1669,6 +1669,19 @@ void CPU::misc()
// Invert carry
m_cf = (m_cf) ? 0 : 1;
break;
case 0xf3: // DI
m_wait_cycles += 4;
// Disable Interrupts by clearing the IME flag
m_ime = 0;
break;
case 0xfb: // EI
m_wait_cycles += 4;
// Enable Interrupts by setting the IME flag.
// The flag is only set after the instruction following EI
m_should_enable_ime = true;
break;
default:
VERIFY_NOT_REACHED();
}