added mm_bootstrap() skeleton function

git-svn-id: svn://anubis/hos/trunk@31 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/boot/k_bootstrap.c

@@ -40,5 +40,12 @@ u32_t k_bootstrap(mb_info_t * mb_info, u32_t mb_magic)
 
     DEBUG_LETTER(3, 'd');
 
+    /*
+     * These functions could destroy the multiboot information block and
+     * associated structures, so we must be finished reading those structures
+     * before calling them.
+     */
+    mm_bootstrap();
+
     return 0;
 }

kernel/mm/mm.c

@@ -28,3 +28,27 @@ void mm_record_mmap_entry(mb_mmap_t * mmap)
         k_early_panic("Too many mmap_entries!");
     }
 }
+
+/**************************************************************************
+ * This function is run in segmented memory before paging is in effect.   *
+ * It is run after the bootloader information has been read, so we can    *
+ * overwrite that memory now.                                             *
+ *************************************************************************/
+void mm_bootstrap()
+{
+    if (mm_mmap_num_entries < 1)
+    {
+        k_early_panic("No mmap entries read from bootloader!");
+    }
+
+    int mmap_idx, i;
+    for (mmap_idx = 0; mmap_idx < mm_mmap_num_entries; mmap_idx++)
+    {
+    }
+
+    /* Clear the page directory */
+    for (i = 0; i < sizeof(page_directory) / sizeof(page_directory[0]); i++)
+    {
+        page_directory[i] = 0;
+    }
+}

kernel/mm/mm.h

@@ -20,6 +20,7 @@ typedef struct
 } mm_mem_range_t;
 
 void mm_record_mmap_entry(mb_mmap_t * mmap);
+void mm_bootstrap();
 
 #endif