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rtpc: fix mmu invalid i/o access handling

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This commit is contained in:
Patrick Mackinlay 2022-12-23 10:26:41 +07:00
parent 4193639479
commit 5e17cb34d7
1 changed files with 23 additions and 11 deletions
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34
src/mame/ibm/rosetta.cpp
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@ -5,7 +5,7 @@
* IBM Rosetta MMU.
*
* Sources:
* - http://bitsavers.org/pdf/ibm/pc/rt/75X0232_RT_PC_Technical_Reference_Volume_1_Jun87.pdf
* - IBM RT PC Hardware Technical Reference Volume I, 75X0232, March 1987
*
* TODO:
* - tighten error detection/reporting
@ -281,6 +281,15 @@ bool rosetta_device::ior(u32 address, u32 &data)
data = rca_r(offset - 0x1000U);
return true;
}
else
{
// invalid i/o address logic only applies to accesses within the mapped range
LOGMASKED(LOG_INVALID, "ior invalid address 0x%06x (%s)\n", address, machine().describe_context());
m_control[MER] |= MER_O;
set_mear(address, MEMORY);
return bool(m_control[TCR] & TCR_D);
}
break;
}
}
@ -290,11 +299,8 @@ bool rosetta_device::ior(u32 address, u32 &data)
return true;
}
LOGMASKED(LOG_INVALID, "ior invalid address 0x%06x (%s)\n", address, machine().describe_context());
m_control[MER] |= MER_O;
set_mear(address, MEMORY);
return bool(m_control[TCR] & TCR_D);
LOGMASKED(LOG_INVALID, "ior unknown address 0x%06x (%s)\n", address, machine().describe_context());
return false;
}
bool rosetta_device::iow(u32 address, u32 data)
@ -334,6 +340,16 @@ bool rosetta_device::iow(u32 address, u32 data)
rca_w(offset - 0x1000U, data);
return true;
}
else
{
// invalid i/o address logic only applies to accesses within the mapped range
LOGMASKED(LOG_INVALID, "iow invalid address 0x%06x data 0x%08x (%s)\n", address, data, machine().describe_context());
m_control[MER] |= MER_O;
set_mear(address, MEMORY);
set_pchk(true);
return true;
}
break;
}
}
@ -343,11 +359,7 @@ bool rosetta_device::iow(u32 address, u32 data)
return true;
}
LOGMASKED(LOG_INVALID, "iow invalid address 0x%06x data 0x%08x (%s)\n", address, data, machine().describe_context());
m_control[MER] |= MER_O;
set_mear(address, MEMORY);
set_pchk(true);
LOGMASKED(LOG_INVALID, "iow unknown address 0x%06x data 0x%08x (%s)\n", address, data, machine().describe_context());
return true;
}