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idehd: Actually implement read multiple command. Fixes crash on nbashowt where the vegas driver assumes that the buffer is 16 deep. (nw)

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This commit is contained in:
Ted Green 2018-01-12 12:32:36 -07:00
parent 4b52255746
commit 767c546a90
1 changed files with 19 additions and 7 deletions
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26
src/devices/machine/idehd.cpp
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@ -111,7 +111,7 @@ void ata_mass_storage_device::ide_build_identify_device()
"1.0", 4);
swap_strncpy(&m_identify_buffer[27], /* 27-46: model number */
"MAME Compressed Hard Disk", 20);
m_identify_buffer[47] = 0x8001; /* 47: read/write multiple support */
m_identify_buffer[47] = 0x8010; /* 47: read/write multiple support, value from Seagate Quantum Fireball */
m_identify_buffer[48] = 0; /* 48: reserved */
m_identify_buffer[49] = 0x0f03; /* 49: capabilities */
m_identify_buffer[50] = 0; /* 50: reserved */
@ -406,6 +406,18 @@ void ata_mass_storage_device::fill_buffer()
case IDE_COMMAND_IDENTIFY_DEVICE:
break;
case IDE_COMMAND_READ_MULTIPLE:
/* if there is more data to read, keep going */
if (m_sector_count > 0)
m_sector_count--;
if (m_sector_count > 0)
{
// Read the next sector with no delay
finished_read();
}
break;
default:
/* if there is more data to read, keep going */
if (m_sector_count > 0)
@ -423,23 +435,23 @@ void ata_mass_storage_device::fill_buffer()
void ata_mass_storage_device::finished_read()
{
int lba = lba_address(), count;
int lba = lba_address(), read_status;
set_dasp(CLEAR_LINE);
/* now do the read */
count = read_sector(lba, &m_buffer[0]);
read_status = read_sector(lba, &m_buffer[0]);
/* if we succeeded, advance to the next sector and set the nice bits */
if (count == 1)
if (read_status)
{
/* advance the pointers, unless this is the last sector */
/* Gauntlet: Dark Legacy checks to make sure we stop on the last sector */
if (m_sector_count != 1)
next_sector();
/* signal an interrupt */
if (--m_sectors_until_int == 0 || m_sector_count == 1)
/* signal an interrupt, IDE_COMMAND_READ_MULTIPLE sets the interrupt at the start the block */
if (--m_sectors_until_int == 0 || (m_sector_count == 1 && m_command != IDE_COMMAND_READ_MULTIPLE))
{
m_sectors_until_int = ((m_command == IDE_COMMAND_READ_MULTIPLE) ? m_block_count : 1);
set_irq(ASSERT_LINE);
@ -746,7 +758,7 @@ void ata_mass_storage_device::process_command()
break;
case IDE_COMMAND_SET_BLOCK_COUNT:
LOGPRINT(("IDE Set block count (%02X)\n", m_sector_count));
LOGPRINT(("IDE Set block count (%d)\n", m_sector_count));
m_block_count = m_sector_count;