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ESDI/MFM AT changes:

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Make sure they IRQ activations are more IDE-like and correct.
This commit is contained in:
TC1995
2024-03-01 19:26:32 +01:00
parent d77fc47408
commit ff6964f73d
2 changed files with 31 additions and 27 deletions
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32
src/disk/hdc_st506_at.c
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@@ -134,26 +134,27 @@ st506_at_log(const char *fmt, ...)
# define st506_at_log(fmt, ...)
#endif
static inline void
static __inline void
irq_raise(mfm_t *mfm)
{
if (!(mfm->fdisk & 2))
picint(1 << 14);
mfm->irqstat = 1;
if (!(mfm->fdisk & 2))
picint_common(1 << 14, PIC_IRQ_EDGE, 1, NULL);
}
static inline void
irq_lower(UNUSED(mfm_t *mfm))
static __inline void
irq_lower(mfm_t *mfm)
{
picintc(1 << 14);
mfm->irqstat = 0;
if (!(mfm->fdisk & 2))
picint_common(1 << 14, PIC_IRQ_EDGE, 0, NULL);
}
static void
static __inline void
irq_update(mfm_t *mfm)
{
if (mfm->irqstat && !((pic2.irr | pic2.isr) & 0x40) && !(mfm->fdisk & 2))
picint(1 << 14);
uint8_t set = !(mfm->fdisk & 2) && mfm->irqstat;
picint_common(1 << 14, PIC_IRQ_EDGE, set, NULL);
}
/*
@@ -378,6 +379,7 @@ static void
mfm_write(uint16_t port, uint8_t val, void *priv)
{
mfm_t *mfm = (mfm_t *) priv;
uint8_t old;
st506_at_log("WD1003 write(%04x, %02x)\n", port, val);
@@ -408,7 +410,7 @@ mfm_write(uint16_t port, uint8_t val, void *priv)
case 0x01f6: /* drive/head */
mfm->head = val & 0xF;
mfm->drvsel = (val & 0x10) ? 1 : 0;
mfm->drvsel = !!(val & 0x10);
if (mfm->drives[mfm->drvsel].present)
mfm->status = STAT_READY | STAT_DSC;
else
@@ -425,15 +427,15 @@ mfm_write(uint16_t port, uint8_t val, void *priv)
timer_set_delay_u64(&mfm->callback_timer, 500 * MFM_TIME);
mfm->reset = 1;
mfm->status = STAT_BUSY;
}
if (val & 0x04) {
} else if (!(mfm->fdisk & 0x04) && (val & 0x04)) {
/* Drive held in reset. */
timer_disable(&mfm->callback_timer);
mfm->status = STAT_BUSY;
}
old = mfm->fdisk;
mfm->fdisk = val;
irq_update(mfm);
if (!(val & 0x02) && (old & 0x02))
irq_update(mfm);
break;
default: