[v0.22] Add check to properly detect TigerLake GT2 80/96 EUs

src/intel/cpuid.cpp

@@ -0,0 +1,71 @@
+#include "../common/global.hpp"
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <cstdio>
+
+#define CPU_VENDOR_MAX_LENGTH   13
+#define CPU_NAME_MAX_LENGTH     49
+#define CPU_VENDOR_INTEL_STRING "GenuineIntel"
+
+void cpuid(uint32_t level, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx) {
+        __asm volatile("cpuid"
+            : "=a" (*eax),
+              "=b" (*ebx),
+              "=c" (*ecx),
+              "=d" (*edx)
+            : "0" (level), "2" (*ecx));
+}
+
+char* get_cpu_vendor() {
+  uint32_t vendor[3];
+  uint32_t dummy;
+  char * name = (char *) emalloc(sizeof(char) * CPU_VENDOR_MAX_LENGTH);
+  memset(name, 0, CPU_VENDOR_MAX_LENGTH);
+
+  cpuid(0x00000000, &dummy, vendor+0x0, vendor+0x2, vendor+0x1);
+
+  snprintf(name, CPU_VENDOR_MAX_LENGTH, "%s", (char *) vendor);
+
+  return name;
+}
+
+char* get_str_cpu_name_internal() {
+  uint32_t brand[12];
+  char * name = (char *) emalloc(sizeof(char) * CPU_NAME_MAX_LENGTH);
+  memset(name, 0, CPU_NAME_MAX_LENGTH);
+
+  cpuid(0x80000002, brand+0x0, brand+0x1, brand+0x2, brand+0x3);
+  cpuid(0x80000003, brand+0x4, brand+0x5, brand+0x6, brand+0x7);
+  cpuid(0x80000004, brand+0x8, brand+0x9, brand+0xa, brand+0xb);
+
+  snprintf(name, CPU_NAME_MAX_LENGTH, "%s", (char *) brand);
+
+  return name;
+}
+
+bool is_corei5() {
+  uint32_t eax = 0;
+  uint32_t ebx = 0;
+  uint32_t ecx = 0;
+  uint32_t edx = 0;
+
+  // Get CPU vendor
+  char* cpu_vendor = get_cpu_vendor();
+
+  if(strcmp(CPU_VENDOR_INTEL_STRING, cpu_vendor) != 0) {
+    printBug("is_corei5: invalid CPU vendor: %s", cpu_vendor);
+    return false;
+  }
+
+  cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
+
+  if (eax < 0x80000004){
+    printBug("is_corei5: unexpected max extended level: 0x%.8X", eax);
+    return false;
+  }
+
+  // Get CPU name
+  char* cpu_name = get_str_cpu_name_internal();
+  return strstr(cpu_name, "i5") != NULL;
+}