Add support for cpuid 4

Signed-off-by: Alexey Romko <[email protected]>

Author: nevilad

core/vcpu.c

@@ -2715,7 +2715,43 @@ static void handle_cpuid_virtual(struct vcpu_t *vcpu, uint32_t a, uint32_t c)
         case 3:                         // Reserved
         case 4: {                       // Deterministic Cache Parameters
             // [31:26] cores per package - 1
-            state->_eax = state->_ebx = state->_ecx = state->_edx = 0;
+            // Using QEMU's values
+            if( 0 == c )
+            {
+              //1 0 01 00001 data cache, level 1, fully associative cache
+              state->_eax = 0x121;
+              state->_ebx = 0x1C0003F;
+              state->_ecx = 0x3F;
+              state->_edx = 0x1;
+            }
+            else if( 1 == c )
+            {
+              //1 0 01 00010 instr cache, level 1, fully associative cache
+              state->_eax = 0x122;
+              state->_ebx = 0x1C0003F;
+              state->_ecx = 0x3F;
+              state->_edx = 0x1;
+            }
+            else if( 2 == c )
+            {
+              //1 0 10 00011 unified cache, level 2, fully associative cache
+              state->_eax = 0x143;
+              state->_ebx = 0x3C0003F;
+              state->_ecx = 0xFFF;
+              state->_edx = 0x1;
+            }
+            else if( 3 == c )
+            {
+              //1 0 11 00011 unified cache, level 3, fully associative cache
+              state->_eax = 0x163;
+              state->_ebx = 0x3C0003F;
+              state->_ecx = 0x3FFF;
+              state->_edx = 0x6;
+            }
+            else
+            {
+              state->_eax = state->_ebx = state->_ecx = state->_edx = 0;
+            }
             return;
         }
         case 5:                         // MONITOR/MWAIT