externals: Add zycore

Merge commit '80d62f2249' as 'externals/zycore'

externals/zycore/src/API/Memory.c

@@ -0,0 +1,128 @@
+/***************************************************************************************************
+
+  Zyan Core Library (Zycore-C)
+
+  Original Author : Florian Bernd
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+
+***************************************************************************************************/
+
+#include <Zycore/API/Memory.h>
+
+#if   defined(ZYAN_WINDOWS)
+
+#elif defined(ZYAN_POSIX)
+#   include <unistd.h>
+#else
+#   error "Unsupported platform detected"
+#endif
+
+/* ============================================================================================== */
+/* Exported functions                                                                             */
+/* ============================================================================================== */
+
+/* ---------------------------------------------------------------------------------------------- */
+/* General                                                                                        */
+/* ---------------------------------------------------------------------------------------------- */
+
+ZyanU32 ZyanMemoryGetSystemPageSize()
+{
+#if defined(ZYAN_WINDOWS)
+
+    SYSTEM_INFO system_info;
+    GetSystemInfo(&system_info);
+
+    return system_info.dwPageSize;
+
+#elif defined(ZYAN_POSIX)
+
+    return sysconf(_SC_PAGE_SIZE);
+
+#endif
+}
+
+ZyanU32 ZyanMemoryGetSystemAllocationGranularity()
+{
+#if defined(ZYAN_WINDOWS)
+
+    SYSTEM_INFO system_info;
+    GetSystemInfo(&system_info);
+
+    return system_info.dwAllocationGranularity;
+
+#elif defined(ZYAN_POSIX)
+
+    return sysconf(_SC_PAGE_SIZE);
+
+#endif
+}
+
+/* ---------------------------------------------------------------------------------------------- */
+/* Memory management                                                                              */
+/* ---------------------------------------------------------------------------------------------- */
+
+ZyanStatus ZyanMemoryVirtualProtect(void* address, ZyanUSize size, 
+    ZyanMemoryPageProtection protection)
+{
+#if defined(ZYAN_WINDOWS)
+
+    DWORD old;
+    if (!VirtualProtect(address, size, protection, &old))
+    {
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+#elif defined(ZYAN_POSIX)
+
+    if (mprotect(address, size, protection))
+    {
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+#endif
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanStatus ZyanMemoryVirtualFree(void* address, ZyanUSize size)
+{
+#if defined(ZYAN_WINDOWS)
+
+    ZYAN_UNUSED(size);
+    if (!VirtualFree(address, 0, MEM_RELEASE))
+    {
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+#elif defined(ZYAN_POSIX)
+
+    if (munmap(address, size))
+    {
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+#endif
+
+    return ZYAN_STATUS_SUCCESS;    
+}
+
+/* ---------------------------------------------------------------------------------------------- */
+
+/* ============================================================================================== */