Ignore a few more "harmless" functions when optimizing.

[cc65] / include / em.h

diff --git a/include/em.h b/include/em.h
index dbeb419458c69a044aa56a9b2530a413ee70b792..f61a8a74fe3444c13e591aeffe30a1834c9eb91b 100644 (file)
--- a/include/em.h
+++ b/include/em.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2002      Ullrich von Bassewitz                                       */
-/*               Wacholderweg 14                                             */
-/*               D-70597 Stuttgart                                           */
-/* EMail:        uz@musoftware.de                                            */
+/* (C) 2002-2011, Ullrich von Bassewitz                                      */
+/*                Roemerstrasse 52                                           */
+/*                D-70794 Filderstadt                                        */
+/* EMail:         uz@cc65.org                                                */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -76,24 +76,41 @@ struct em_copy {
 
 
 unsigned char __fastcall__ em_load_driver (const char* driver);
-/* Load an extended memory driver and return an error code */
+/* Load and install an extended memory driver. Return an error code. */
 
 unsigned char em_unload (void);
-/* Unload the currently loaded driver. */
+/* Uninstall, then unload the currently loaded driver. */
+
+unsigned char __fastcall__ em_install (void* driver);
+/* Install an already loaded driver. Return an error code. */
+
+unsigned char em_uninstall (void);
+/* Uninstall the currently loaded driver and return an error code.
+ * Note: This call does not free allocated memory.
+ */
 
 unsigned em_pagecount (void);
 /* Return the total number of 256 byte pages available in extended memory. */
 
 void* __fastcall__ em_map (unsigned page);
 /* Unmap the current page from memory and map a new one. The function returns
- * a pointer to the location of the page in memory. Note: Without calling 
+ * a pointer to the location of the page in memory. Note: Without calling
  * em_commit, the old contents of the memory window may be lost!
  */
 
-void __fastcall__ em_commit (void);
+void* __fastcall__ em_use (unsigned page);
+/* Tell the driver that the memory window is associated with a given page.
+ * This call is very similar to em_map. The difference is that the driver
+ * does not necessarily transfer the current contents of the extended
+ * memory into the returned window. If you're going to just write to the
+ * window and the current contents of the window are invalid or no longer
+ * use, this call may perform better than em_map.
+ */
+
+void em_commit (void);
 /* Commit changes in the memory window to extended storage. If the contents
  * of the memory window have been changed, these changes may be lost if
- * em_map, em_copyfrom or em_copyto are called without calling em_commit 
+ * em_map, em_copyfrom or em_copyto are called without calling em_commit
  * first. Note: Not calling em_commit does not mean that the changes are
  * discarded, it does just mean that some drivers will discard the changes.
  */