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-sgi_mc_device: Fixed Graphics-to-Host DMAs to happen a qword at a time, nw

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This commit is contained in:
MooglyGuy 2019-02-16 13:05:22 +01:00
parent bd0d1cf5da
commit 6df1235c3f
1 changed files with 16 additions and 3 deletions
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19
src/mame/machine/sgi.cpp
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@ -223,9 +223,22 @@ void sgi_mc_device::dma_tick()
}
else
{
m_space->write_byte(addr, m_space->read_byte(m_dma_gio64_addr));
m_dma_mem_addr++;
m_dma_count--;
const uint32_t remaining = m_dma_count & 0x0000ffff;
uint32_t length = 8;
uint64_t shift = 56;
if (remaining < 8)
length = remaining;
uint64_t data = m_space->read_qword(m_dma_gio64_addr);
for (uint32_t i = 0; i < length; i++)
{
m_space->write_byte(addr, (uint8_t)(data >> shift));
addr++;
shift -= 8;
}
m_dma_mem_addr += length;
m_dma_count -= length;
}
}
else