From bf68656e8fedf58fa3cf303d8bd7175a6720a2e8 Mon Sep 17 00:00:00 2001
From: SarahW <pcem@pcem-emulator.co.uk>
Date: Tue, 30 Jun 2020 21:07:21 +0100
Subject: [PATCH] Implement CPUID cache register for Pentium Pro/II.

---
 src/cpu.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/cpu.c b/src/cpu.c
index 2de3673..a08f2f1 100644
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -1629,7 +1629,7 @@ void cpu_CPUID()
                 case CPU_PENTIUMPRO:
                 if (!EAX)
                 {
-                        EAX = 0x00000001;
+                        EAX = 0x00000002;
                         EBX = 0x756e6547;
                         EDX = 0x49656e69;
                         ECX = 0x6c65746e;
@@ -1640,6 +1640,13 @@ void cpu_CPUID()
                         EBX = ECX = 0;
                         EDX = CPUID_FPU | CPUID_VME | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_CMPXCHG8B | CPUID_CMOV | CPUID_SEP;
                 }
+                else if (EAX == 2)
+                {
+                        EAX = 0x03020101;
+                        EBX = 0;
+                        ECX = 0;
+                        EDX = 0x06040a42;
+                }
                 else
                         EAX = EBX = ECX = EDX = 0;
                 break;
@@ -1647,7 +1654,7 @@ void cpu_CPUID()
                 case CPU_PENTIUM_2:
                 if (!EAX)
                 {
-                        EAX = 0x00000001;
+                        EAX = 0x00000002;
                         EBX = 0x756e6547;
                         EDX = 0x49656e69;
                         ECX = 0x6c65746e;
@@ -1658,6 +1665,13 @@ void cpu_CPUID()
                         EBX = ECX = 0;
                         EDX = CPUID_FPU | CPUID_VME | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_CMPXCHG8B | CPUID_CMOV | CPUID_MMX | CPUID_SEP;
                 }
+                else if (EAX == 2)
+                {
+                        EAX = 0x03020101;
+                        EBX = 0;
+                        ECX = 0;
+                        EDX = 0x08040c43;
+                }
                 else
                         EAX = EBX = ECX = EDX = 0;
                 break;