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Diffstat (limited to 'src/devices/cpu/i386/i486ops.hxx')
-rw-r--r--src/devices/cpu/i386/i486ops.hxx8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/devices/cpu/i386/i486ops.hxx b/src/devices/cpu/i386/i486ops.hxx
index 77e9ee3dd2d..6946e463796 100644
--- a/src/devices/cpu/i386/i486ops.hxx
+++ b/src/devices/cpu/i386/i486ops.hxx
@@ -44,13 +44,15 @@ void i386_device::i486_cpuid() // Opcode 0x0F A2
void i386_device::i486_invd() // Opcode 0x0f 08
{
- // Nothing to do ?
+ // TODO: manage the cache if present
+ opcode_invd();
CYCLES(CYCLES_INVD);
}
void i386_device::i486_wbinvd() // Opcode 0x0f 09
{
- // Nothing to do ?
+ // TODO: manage the cache if present
+ opcode_wbinvd();
}
void i386_device::i486_cmpxchg_rm8_r8() // Opcode 0x0f b0
@@ -233,6 +235,8 @@ void i386_device::i486_group0F01_16() // Opcode 0x0f 01
ea = GetEA(modrm,1);
}
WRITE16(ea, m_gdtr.limit);
+ // Win32s requires all 32 bits to be stored here, despite various Intel docs
+ // claiming that the upper 8 bits are either zeroed or undefined in 16-bit mode
WRITE32(ea + 2, m_gdtr.base);
CYCLES(CYCLES_SGDT);
break;