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[NTVDM] : Implement getMSW and setMSW for getting and setting the Machine Status Word (lower word of CR0).

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[FAST486]: MSW = Machine Status Word

svn path=/branches/ntvdm/; revision=61044
This commit is contained in:
Hermès Bélusca-Maïto 2013-11-18 20:25:10 +00:00
parent 74933952b5
commit 8998a96d56
2 changed files with 10 additions and 8 deletions
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12
lib/fast486/opgroups.c
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@ -1803,7 +1803,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
/* SMSW */
case 4:
{
/* Store the lower 16 bits of CR0 */
/* Store the lower 16 bits (Machine Status Word) of CR0 */
return Fast486WriteModrmWordOperands(State,
&ModRegRm,
FALSE,
@ -1813,7 +1813,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
/* LMSW */
case 6:
{
USHORT MasterStatusWord, Dummy;
USHORT MachineStatusWord, Dummy;
/* This is a privileged instruction */
if (Fast486GetCurrentPrivLevel(State) != 0)
@ -1822,8 +1822,8 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
return FALSE;
}
/* Read the new master status word */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Dummy, &MasterStatusWord))
/* Read the new Machine Status Word */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Dummy, &MachineStatusWord))
{
/* Exception occurred */
return FALSE;
@ -1831,7 +1831,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
/* This instruction cannot be used to return to real mode */
if ((State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
&& !(MasterStatusWord & FAST486_CR0_PE))
&& !(MachineStatusWord & FAST486_CR0_PE))
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return FALSE;
@ -1839,7 +1839,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
/* Set the lowest 4 bits */
State->ControlRegisters[FAST486_REG_CR0] &= 0xFFFFFFF0;
State->ControlRegisters[FAST486_REG_CR0] |= MasterStatusWord & 0x0F;
State->ControlRegisters[FAST486_REG_CR0] |= MachineStatusWord & 0x0F;
return TRUE;
}