--- qemu/exec.c	Sat Sep  4 15:51:23 2004
+++ qemu/exec.c	Sat Sep  4 16:12:05 2004
@@ -18,6 +18,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include "config.h"
+#ifdef _WIN32
+#include <windows.h>
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
@@ -127,13 +130,35 @@
 
 static void page_init(void)
 {
+#ifdef _WIN32
+    SYSTEM_INFO system_info;
+    DWORD old_protect;
+#else
+    unsigned long address;
+    unsigned long length;
+#endif
+
     /* NOTE: we can always suppose that qemu_host_page_size >=
        TARGET_PAGE_SIZE */
 #ifdef _WIN32
-    qemu_real_host_page_size = 4096;
+    GetSystemInfo(&system_info);
+    qemu_real_host_page_size = system_info.dwPageSize;
+
+    VirtualProtect(code_gen_buffer, sizeof(code_gen_buffer),
+                   PAGE_EXECUTE_READWRITE, &old_protect);
 #else
     qemu_real_host_page_size = getpagesize();
+
+    address = (unsigned long)code_gen_buffer;
+    address &= ~(qemu_real_host_page_size - 1);
+
+    length = sizeof(code_gen_buffer);
+    length += qemu_real_host_page_size - 1;
+    length &= ~(qemu_real_host_page_size - 1);
+
+    mprotect(address, length, PROT_READ | PROT_WRITE | PROT_EXEC);
 #endif
+
     if (qemu_host_page_size == 0)
         qemu_host_page_size = qemu_real_host_page_size;
     if (qemu_host_page_size < TARGET_PAGE_SIZE)