[common] cpuinfo: implement for Windows

common/src/platform/windows/CMakeLists.txt

@@ -36,6 +36,7 @@ add_library(lg_common_platform_code STATIC
     windebug.c
     ivshmem.c
     time.c
+    cpuinfo.c
 )
 
 target_link_libraries(lg_common_platform_code

common/src/platform/windows/cpuinfo.c

@@ -0,0 +1,94 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2021 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "common/cpuinfo.h"
+#include "common/debug.h"
+#include "common/windebug.h"
+
+#include <windows.h>
+
+static void getProcessorCount(int * procs)
+{
+  if (!procs)
+    return;
+
+  SYSTEM_INFO si;
+  GetSystemInfo(&si);
+  *procs = si.dwNumberOfProcessors;
+}
+
+static bool getCPUModel(char * model, size_t modelSize)
+{
+  if (!model)
+    return true;
+
+  LRESULT lr;
+  DWORD cb = modelSize;
+
+  if ((lr = RegGetValueA(HKEY_LOCAL_MACHINE, "HARDWARE\\DESCRIPTION\\SYSTEM\\CentralProcessor\\0",
+    "ProcessorNameString", RRF_RT_REG_SZ, NULL, model, &cb)))
+  {
+    DEBUG_WINERROR("Failed to query registry", lr);
+    return false;
+  }
+
+  return true;
+}
+
+static bool getCoreCount(int * cores)
+{
+  if (!cores)
+    return true;
+
+  DWORD cb = 0;
+  GetLogicalProcessorInformationEx(RelationProcessorCore, NULL, &cb);
+  if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+  {
+    DEBUG_WINERROR("Failed to call GetLogicalProcessorInformationEx", GetLastError());
+    return false;
+  }
+
+  BYTE buffer[cb];
+  if (!GetLogicalProcessorInformationEx(RelationProcessorCore,
+      (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX) buffer, &cb))
+  {
+    DEBUG_WINERROR("Failed to call GetLogicalProcessorInformationEx", GetLastError());
+    return false;
+  }
+
+  *cores = 0;
+  DWORD offset = 0;
+  while (offset < cb)
+  {
+    PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX lpi =
+      (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX) (buffer + offset);
+    if (lpi->Relationship == RelationProcessorCore)
+      ++*cores;
+    offset += lpi->Size;
+  }
+
+  return true;
+}
+
+bool lgCPUInfo(char * model, size_t modelSize, int * procs, int * cores)
+{
+  getProcessorCount(procs);
+  return getCPUModel(model, modelSize) && getCoreCount(cores);
+}