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Fixed IDE status readout on an absent device 1 with a present device 0, fixes hangs with AMI BIOS'es on hard disk detection in such cases.

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OBattler
2019-11-01 20:47:52 +01:00
parent ccd0df5cff
commit b6ae1098d7
1 changed files with 7 additions and 5 deletions
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12
src/disk/hdc_ide.c
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@@ -9,7 +9,7 @@
* Implementation of the IDE emulation for hard disks and ATAPI
* CD-ROM devices.
*
* Version: @(#)hdc_ide.c 1.0.62 2019/10/31
* Version: @(#)hdc_ide.c 1.0.63 2019/11/01
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
@@ -1631,10 +1631,12 @@ ide_read_data(ide_t *ide, int length)
static uint8_t
ide_status(ide_t *ide, int ch)
ide_status(ide_t *ide, ide_t *ide_other, int ch)
{
if (ide->type == IDE_NONE)
if ((ide->type == IDE_NONE) && ((ide_other->type == IDE_NONE) || !(ch & 1)))
return 0x7F; /* Bit 7 pulled down, all other bits pulled up, per the spec. */
else if ((ide->type == IDE_NONE) && (ch & 1))
return 0x00; /* On real hardware, a slave with a present master always returns a status of 0x00. */
else if (ide->type == IDE_ATAPI)
return (ide->sc->status & ~DSC_STAT) | (ide->service ? SERVICE_STAT : 0);
else
@@ -1727,7 +1729,7 @@ ide_readb(uint16_t addr, void *priv)
DF (drive fault). */
case 0x7: /* Status */
ide_irq_lower(ide);
temp = ide_status(ide, ch);
temp = ide_status(ide, ide_drives[ch ^ 1], ch);
break;
}
@@ -1751,7 +1753,7 @@ ide_read_alt_status(uint16_t addr, void *priv)
/* Per the Seagate ATA-3 specification:
Reading the alternate status does *NOT* clear the IRQ. */
temp = ide_status(ide, ch);
temp = ide_status(ide, ide_drives[ch ^ 1], ch);
ide_log("ide_read_alt_status(%04X, %08X) = %02X\n", addr, priv, temp);
return temp;