1 files changed, 67 insertions, 0 deletions
diff --git a/i386/pc/i16/i16_init.c b/i386/pc/i16/i16_init.c
new file mode 100644
index 0000000..23a51df
--- /dev/null
+++ b/i386/pc/i16/i16_init.c
@@ -0,0 +1,67 @@
+/* 
+ * Copyright (c) 1995-1994 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+
+#include <mach/machine/code16.h>
+#include <mach/machine/proc_reg.h>
+
+#include "vm_param.h"
+
+
+/* Code segment we originally had when we started in real mode.  */
+unsigned short real_cs;
+
+/* Virtual address of physical memory.  */
+vm_offset_t phys_mem_va;
+
+/* Physical address of start of boot image.  */
+vm_offset_t boot_image_pa;
+
+/* Upper limit of known physical memory.  */
+vm_offset_t phys_mem_max;
+
+
+CODE16
+
+#include "i16_bios.h"
+
+/* Called by i16_crt0 (or the equivalent)
+   to set up our basic 16-bit runtime environment
+   before calling i16_main().  */
+void i16_init(void)
+{
+	/* Find our code/data/everything segment.  */
+	real_cs = get_cs();
+
+	/* Find out where in physical memory we got loaded.  */
+	boot_image_pa = real_cs << 4;
+
+	/* Find out where the bottom of physical memory is.
+	   (We won't be able to directly use it for 32-bit accesses
+	   until we actually get into 32-bit mode.)  */
+	phys_mem_va = -boot_image_pa;
+
+	/* The base of linear memory is at the same place,
+	   at least until we turn paging on.  */
+	linear_base_va = phys_mem_va;
+}
+