static void I486OP(cmpxchg_rm8_r8)(i386_state *cpustate) // Opcode 0x0f b0
{
UINT8 modrm = FETCH(cpustate);
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
STORE_RM8(modrm, src);
cpustate->ZF = 1;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_T);
} else {
REG8(AL) = dst;
cpustate->ZF = 0;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_REG_F);
}
} else {
UINT32 ea = GetEA(cpustate,modrm);
UINT8 dst = READ8(cpustate,ea);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
WRITE8(cpustate,modrm, src);
cpustate->ZF = 1;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_T);
} else {
REG8(AL) = dst;
cpustate->ZF = 0;
CYCLES(cpustate,CYCLES_CMPXCHG_REG_MEM_F);
}
}
}
void i386_device::i486_cmpxchg_rm8_r8() // Opcode 0x0f b0
{
UINT8 modrm = FETCH();
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
STORE_RM8(modrm, src);
m_ZF = 1;
CYCLES(CYCLES_CMPXCHG_REG_REG_T);
} else {
REG8(AL) = dst;
m_ZF = 0;
CYCLES(CYCLES_CMPXCHG_REG_REG_F);
}
} else {
// TODO: Check write if needed
UINT32 ea = GetEA(modrm,0);
UINT8 dst = READ8(ea);
UINT8 src = LOAD_REG8(modrm);
if( REG8(AL) == dst ) {
WRITE8(ea, src);
m_ZF = 1;
CYCLES(CYCLES_CMPXCHG_REG_MEM_T);
} else {
REG8(AL) = dst;
m_ZF = 0;
CYCLES(CYCLES_CMPXCHG_REG_MEM_F);
}
}
}
static void I486OP(xadd_rm8_r8)(i386_state *cpustate) // Opcode 0x0f c0
{
UINT8 modrm = FETCH(cpustate);
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
STORE_RM16(modrm, dst + src);
STORE_REG16(modrm, dst);
CYCLES(cpustate,CYCLES_XADD_REG_REG);
} else {
UINT32 ea = GetEA(cpustate,modrm);
UINT8 dst = READ8(cpustate,ea);
UINT8 src = LOAD_REG8(modrm);
WRITE8(cpustate,ea, dst + src);
STORE_REG8(modrm, dst);
CYCLES(cpustate,CYCLES_XADD_REG_MEM);
}
}
void i386_device::i486_xadd_rm8_r8() // Opcode 0x0f c0
{
UINT8 modrm = FETCH();
if( modrm >= 0xc0 ) {
UINT8 dst = LOAD_RM8(modrm);
UINT8 src = LOAD_REG8(modrm);
STORE_REG8(modrm, dst);
STORE_RM8(modrm, dst + src);
CYCLES(CYCLES_XADD_REG_REG);
} else {
UINT32 ea = GetEA(modrm,1);
UINT8 dst = READ8(ea);
UINT8 src = LOAD_REG8(modrm);
WRITE8(ea, dst + src);
STORE_REG8(modrm, dst);
CYCLES(CYCLES_XADD_REG_MEM);
}
}
static void I486OP(group0F01_16)(i386_state *cpustate) // Opcode 0x0f 01
{
UINT8 modrm = FETCH(cpustate);
UINT16 address;
UINT32 ea;
switch( (modrm >> 3) & 0x7 )
{
case 0: /* SGDT */
{
if( modrm >= 0xc0 ) {
address = LOAD_RM16(modrm);
ea = i386_translate( cpustate, CS, address );
} else {
ea = GetEA(cpustate,modrm);
}
WRITE16(cpustate,ea, cpustate->gdtr.limit);
WRITE32(cpustate,ea + 2, cpustate->gdtr.base & 0xffffff);
CYCLES(cpustate,CYCLES_SGDT);
break;
}
case 1: /* SIDT */
{
if (modrm >= 0xc0)
{
address = LOAD_RM16(modrm);
ea = i386_translate( cpustate, CS, address );
}
else
{
ea = GetEA(cpustate,modrm);
}
WRITE16(cpustate,ea, cpustate->idtr.limit);
WRITE32(cpustate,ea + 2, cpustate->idtr.base & 0xffffff);
CYCLES(cpustate,CYCLES_SIDT);
break;
}
case 2: /* LGDT */
{
if( modrm >= 0xc0 ) {
address = LOAD_RM16(modrm);
ea = i386_translate( cpustate, CS, address );
} else {
ea = GetEA(cpustate,modrm);
}
cpustate->gdtr.limit = READ16(cpustate,ea);
cpustate->gdtr.base = READ32(cpustate,ea + 2) & 0xffffff;
CYCLES(cpustate,CYCLES_LGDT);
break;
}
case 3: /* LIDT */
{
if( modrm >= 0xc0 ) {
address = LOAD_RM16(modrm);
ea = i386_translate( cpustate, CS, address );
} else {
ea = GetEA(cpustate,modrm);
}
cpustate->idtr.limit = READ16(cpustate,ea);
cpustate->idtr.base = READ32(cpustate,ea + 2) & 0xffffff;
CYCLES(cpustate,CYCLES_LIDT);
break;
}
case 4: /* SMSW */
{
if( modrm >= 0xc0 ) {
STORE_RM16(modrm, cpustate->cr[0]);
CYCLES(cpustate,CYCLES_SMSW_REG);
} else {
ea = GetEA(cpustate,modrm);
WRITE16(cpustate,ea, cpustate->cr[0]);
CYCLES(cpustate,CYCLES_SMSW_MEM);
}
break;
}
case 6: /* LMSW */
{
// TODO: Check for protection fault
UINT8 b;
if( modrm >= 0xc0 ) {
b = LOAD_RM8(modrm);
CYCLES(cpustate,CYCLES_LMSW_REG);
} else {
ea = GetEA(cpustate,modrm);
CYCLES(cpustate,CYCLES_LMSW_MEM);
b = READ8(cpustate,ea);
}
cpustate->cr[0] &= ~0x03;
cpustate->cr[0] |= b & 0x03;
break;
}
case 7: /* INVLPG */
{
// Nothing to do ?
break;
}
default:
fatalerror("i486: unimplemented opcode 0x0f 01 /%d at %08X", (modrm >> 3) & 0x7, cpustate->eip - 2);
break;
}
}
