Initial revision

kern/main.c

@@ -0,0 +1,86 @@
+/*
+ *  PUPA  --  Preliminary Universal Programming Architecture for GRUB
+ *  Copyright (C) 2002  Yoshinori K. Okuji <okuji@enbug.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <pupa/kernel.h>
+#include <pupa/misc.h>
+#include <pupa/mm.h>
+#include <pupa/symbol.h>
+#include <pupa/dl.h>
+#include <pupa/term.h>
+#include <pupa/rescue.h>
+
+/* Return the end of the core image.  */
+pupa_addr_t
+pupa_get_end_addr (void)
+{
+  return pupa_total_module_size + pupa_end_addr;
+}
+
+/* Load all modules in core.  */
+static void
+pupa_load_modules (void)
+{
+  struct pupa_module_header *header;
+
+  for (header = (struct pupa_module_header *) pupa_end_addr;
+       header < (struct pupa_module_header *) pupa_get_end_addr ();
+       header = (struct pupa_module_header *) ((char *) header + header->size))
+    {
+      if (! pupa_dl_load_core ((char *) header + header->offset,
+			       (header->size - header->offset)))
+	pupa_fatal ("%s", pupa_errmsg);
+    }
+}
+
+/* Add the region where modules reside into dynamic memory.  */
+static void
+pupa_add_unused_region (void)
+{
+  if (pupa_total_module_size)
+    pupa_mm_init_region ((void *) pupa_end_addr, pupa_total_module_size);
+}
+
+/* The main routine.  */
+void
+pupa_main (void)
+{
+  void (*normal_func) (void);
+  
+  /* First of all, initialize the machine.  */
+  pupa_machine_init ();
+
+  /* Hello.  */
+  pupa_setcolorstate (PUPA_TERM_COLOR_HIGHLIGHT);
+  pupa_printf ("Welcome to PUPA!");
+  pupa_setcolorstate (PUPA_TERM_COLOR_STANDARD);
+  pupa_printf ("\n\n");
+
+  pupa_register_exported_symbols ();
+  pupa_load_modules ();
+  pupa_add_unused_region ();
+
+  /* If the function pupa_enter_normal_mode is present, call it.  */
+  normal_func = pupa_dl_resolve_symbol ("pupa_enter_normal_mode");
+  if (normal_func)
+    (*normal_func) ();
+
+  /* If pupa_enter_normal_mode fails or doesn't exist, enter rescue mode.  */
+  pupa_printf ("Entering into rescue mode...\n");
+  pupa_enter_rescue_mode ();
+}