added global configuration data block and our own "atexit" type mechanism

that doesn't depend on enough free slots in the C library

src/fbinit.c

@@ -6,6 +6,7 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <linux/fb.h>
+#include "config.h"
 #include "log.h"
 #include "fbinit.h"
 #include "scode.h"
@@ -27,13 +28,25 @@ inline static UINT16 makemask(unsigned offset, unsigned length)
   return (UINT16)(((1 << length) - 1) << offset);
 }
 
+static void do_cleanup(void)
+{
+  /* additional cleanup here */
+  
+  memset(Fb_Ptr, 0, local_info.screenbytes);
+  munmap((void *)Fb_Ptr, local_info.screenbytes);
+  Fb_Ptr = NULL;
+  
+  close(fb_fd);
+  fb_fd = -1;
+}
+
 HRESULT Fb_setup(void)
 {
   HRESULT hr = S_OK;
   struct fb_fix_screeninfo fixed;
   struct fb_var_screeninfo var;
   
-  fb_fd = open("/dev/fb1", O_RDWR);
+  fb_fd = open(Gconfig.framebuffer_device, O_RDWR);
   if (fb_fd == -1)
   {
     hr = ERRNO_AS_SCODE;
@@ -89,21 +102,12 @@ HRESULT Fb_setup(void)
 
   /* additional setup here */
 
+  hr = Config_exitfunc(do_cleanup);
+  if (FAILED(hr))
+    do_cleanup();
   return hr;
 }
 
-void Fb_cleanup(void)
-{
-  /* additional cleanup here */
-  
-  memset(Fb_Ptr, 0, local_info.screenbytes);
-  munmap((void *)Fb_Ptr, local_info.screenbytes);
-  Fb_Ptr = NULL;
-  
-  close(fb_fd);
-  fb_fd = -1;
-}
-
 void Fb_clear(void)
 {
   memset(Fb_Ptr, 0, local_info.screenbytes);