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NEC INM/OUTM instructions (#14)

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This commit is contained in:
Cacodemon345
2022-09-08 01:58:42 +06:00
committed by GitHub
parent 7b29c30819
commit 25b2e16a27
1 changed files with 72 additions and 0 deletions
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72
src/cpu/808x.c
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@@ -1678,6 +1678,27 @@ cpu_data_opff_rm(void) {
}
}
uint16_t
cpu_inw(uint16_t port) {
if (is8086 && !(port & 1)) {
wait(4, 0);
} else {
wait(8, 0);
}
return inw(port);
}
void
cpu_outw(uint16_t port, uint16_t val) {
if (is8086 && !(port & 1)) {
wait(4, 0);
} else {
wait(8, 0);
}
return outw(port, val);
}
/* Executes instructions up to the specified number of cycles. */
void
@@ -1710,6 +1731,57 @@ execx86(int cycs)
// pclog("[%04X:%04X] Opcode: %02X\n", CS, cpu_state.pc, opcode);
if (is186) {
switch (opcode) {
case 0x6c: case 0x6d: /* INM dst, DW/INS dst, DX */
{
bits = 8 << (opcode & 1);
if (!repeating) wait(2, 0);
if (rep_action(bits)) {
break;
} else if (!repeating) {
wait(7, 0);
}
if (bits == 16) {
writememw(es, DI, cpu_inw(DX));
DI += (cpu_state.flags & D_FLAG) ? -2 : 2;
} else {
wait(4, 0);
writememb(es, DI, inb(DX));
DI += (cpu_state.flags & D_FLAG) ? -1 : 1;
}
if (in_rep == 0) {
break;
}
repeating = 1;
clock_end();
break;
}
case 0x6e: case 0x6f: /* OUTM DW, src/OUTS DX, src */
{
uint32_t dest_seg = ovr_seg ? *ovr_seg : ds;
bits = 8 << (opcode & 1);
if (!repeating) wait(2, 0);
if (rep_action(bits)) {
break;
} else if (!repeating) {
wait(7, 0);
}
if (bits == 16) {
cpu_outw(DX, readmemw(dest_seg, SI));
SI += (cpu_state.flags & D_FLAG) ? -2 : 2;
} else {
wait(4, 0);
outb(DX, readmemb(dest_seg + SI));
SI += (cpu_state.flags & D_FLAG) ? -1 : 1;
}
if (in_rep == 0) {
break;
}
repeating = 1;
clock_end();
break;
}
case 0xC8: /* ENTER/PREPARE */
{
uint16_t temp = 0;