80486DX2-66/86Box-fork
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Implemented the poll mode of the PIC, 386BSD no longer hangs (but now resets the machine after a while).

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OBattler
2020-06-17 02:49:20 +02:00
parent 6450830b51
commit 3470bebd81
1 changed files with 31 additions and 0 deletions
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31
src/pic.c
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@@ -240,11 +240,37 @@ pic_write(uint16_t addr, uint8_t val, void *priv)
pic.ocw3 = val;
if (val & 2)
pic.read=(val & 1);
pic.read |= (val & 5);
}
}
}
static int
pic_highest_req(PIC* target_pic, int pic2)
{
uint8_t pending = target_pic->pend & ~target_pic->mask;
int i, highest = 0;
int min = 0, max = 8;
if (AT && pic2) {
min = 8;
max = 16;
}
for (i = min; i < max; i++) {
if ((!AT || (i != 2)) && (pending & (1 << (i & 7)))) {
highest = (i & 7) | 0x80;
break;
}
}
target_pic->read &= ~4;
return highest;
}
uint8_t
pic_read(uint16_t addr, void *priv)
{
@@ -260,6 +286,8 @@ pic_read(uint16_t addr, void *priv)
ret = ((pic.vector & 0xf8) >> 3) << 0;
else if (addr & 1)
ret = pic.mask;
else if (pic.read & 5)
ret = pic_highest_req(&pic, 0);
else if (pic.read) {
if (AT)
ret = pic.ins | (pic2.ins ? 4 : 0);
@@ -394,6 +422,7 @@ pic2_write(uint16_t addr, uint8_t val, void *priv)
pic2.ocw3 = val;
if (val & 2)
pic2.read=(val & 1);
pic2.read |= (val & 5);
}
}
}
@@ -414,6 +443,8 @@ pic2_read(uint16_t addr, void *priv)
ret = ((pic2.vector & 0xf8) >> 3) << 0;
else if (addr & 1)
ret = pic2.mask;
else if (pic2.read & 5)
ret = pic_highest_req(&pic2, 1);
else if (pic2.read)
ret = pic2.ins;
else