[Qemu-devel] [PATCH 2/3] [x86] Core 2 Duo specification v2

[Alexander Graf <agraf@suse.de>]

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This patch adds a Core 2 Duo CPU to the available CPU types. The CPU
definition tries to resemble a real CPU as good as possible, whilst not
exposing features qemu does not implement.
The patch also includes some minor additions that Core 2 Duo CPUs have:

- New MSR: MSR_IA32_PERF_STATUS
- CPUID up to level 5 (cache info and mwait)

Signed-off-by: Alexander Graf <agraf@suse.de>




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Index: qemu/target-i386/cpu.h
===================================================================
--- qemu.orig/target-i386/cpu.h
+++ qemu/target-i386/cpu.h
@@ -242,6 +242,8 @@
 #define MSR_MCG_STATUS                  0x17a
 #define MSR_MCG_CTL                     0x17b
 
+#define MSR_IA32_PERF_STATUS            0x198
+
 #define MSR_PAT                         0x277
 
 #define MSR_EFER                        0xc0000080
@@ -341,6 +343,9 @@
 #define CPUID_VENDOR_AMD_2   0x69746e65 /* "enti" */ 
 #define CPUID_VENDOR_AMD_3   0x444d4163 /* "cAMD" */
 
+#define CPUID_MWAIT_IBE     (1 << 1) /* Interrupts can exit capability */
+#define CPUID_MWAIT_EMX     (0 << 1) /* enumeration supported */
+
 #define EXCP00_DIVZ	0
 #define EXCP01_SSTP	1
 #define EXCP02_NMI	2
Index: qemu/target-i386/helper.c
===================================================================
--- qemu.orig/target-i386/helper.c
+++ qemu/target-i386/helper.c
@@ -165,6 +165,23 @@ static x86_def_t x86_defs[] = {
         .xlevel = 0x8000000A,
         .model_id = "QEMU Virtual CPU version " QEMU_VERSION,
     },
+    {
+        .name = "core2duo",
+        /* original is on level 10 */
+        .level = 5,
+        .family = 6,
+        .model = 15,
+        .stepping = 11,
+        /* the original CPU does have many more features that are not implemented yet */
+        .features = PPRO_FEATURES | 
+            CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
+            CPUID_PSE36,
+        .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR,
+        .ext2_features = (PPRO_FEATURES & 0x0183F3FF) | 
+             CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
+        .xlevel = 0x8000000A,
+        .model_id = "Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz",
+    },
 #endif
     {
         .name = "qemu32",
Index: qemu/target-i386/op_helper.c
===================================================================
--- qemu.orig/target-i386/op_helper.c
+++ qemu/target-i386/op_helper.c
@@ -1915,6 +1915,43 @@ void helper_cpuid(void)
         ECX = 0;
         EDX = 0x2c307d;
         break;
+    case 4:
+        /* cache info: needed for Core compatibility */
+        switch (ECX) {
+            case 0: /* L1 dcache info */
+                EAX = 0x0000121;
+                EBX = 0x1c0003f;
+                ECX = 0x000003f;
+                EDX = 0x0000001;
+                break;
+            case 1: /* L1 icache info */
+                EAX = 0x0000122;
+                EBX = 0x1c0003f;
+                ECX = 0x000003f;
+                EDX = 0x0000001;
+                break;
+            case 2: /* L2 cache info */
+                EAX = 0x0000143;
+                EBX = 0x3c0003f;
+                ECX = 0x0000fff;
+                EDX = 0x0000001;
+                break;
+            default: /* end of info */
+                EAX = 0;
+                EBX = 0;
+                ECX = 0;
+                EDX = 0;
+                break;
+        }
+
+        break;
+    case 5:
+        /* mwait info: needed for Core compatibility */
+        EAX = 0; /* Smallest monitor-line size in bytes */
+        EBX = 0; /* Largest monitor-line size in bytes */
+        ECX = CPUID_MWAIT_EMX | CPUID_MWAIT_IBE;
+        EDX = 0;
+        break;
     case 0x80000000:
         EAX = env->cpuid_xlevel;
         EBX = env->cpuid_vendor1;
@@ -3085,6 +3122,12 @@ void helper_wrmsr(void)
     case MSR_VM_HSAVE_PA:
         env->vm_hsave = val;
         break;
+    case MSR_IA32_PERF_STATUS:
+        /* tsc_increment_by_tick */ 
+        val = 1000ULL;
+        /* CPU multiplier */
+        val |= (((uint64_t)4ULL) << 40);
+        break;
 #ifdef TARGET_X86_64
     case MSR_LSTAR:
         env->lstar = val;