Initial /boot stuff (from Mickey)

1 files changed, 51 insertions, 0 deletions

diff --git a/sys/arch/i386/stand/libsa/exec_i386.c b/sys/arch/i386/stand/libsa/exec_i386.c
new file mode 100644
index 00000000000..3a437498264
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/exec_i386.c
@@ -0,0 +1,51 @@
+
+/* $OpenBSD: exec_i386.c,v 1.1 1997/03/31 03:12:13 weingart Exp $ */
+
+#include <sys/param.h>
+#include <sys/exec.h>
+#include <sys/reboot.h>
+#include <libsa.h>
+
+
+void
+machdep_start(startaddr, howto, loadaddr, ssym, esym)
+	char *startaddr, *loadaddr, *ssym, *esym;
+	int howto;
+{
+	static int argv[9];
+	static int (*x_entry)() = 0;
+
+	x_entry = (void *)startaddr;
+	(int)startaddr &= 0xffffff;
+
+	/*
+	 *  We now pass the various bootstrap parameters to the loaded
+	 *  image via the argument list
+	 *
+	 *  arg0 = 8 (magic)
+	 *  arg1 = boot flags
+	 *  arg2 = boot device
+	 *  arg3 = start of symbol table (0 if not loaded)
+	 *  arg4 = end of symbol table (0 if not loaded)
+	 *  arg5 = transfer address from image
+	 *  arg6 = transfer address for next image pointer
+	 *  arg7 = conventional memory size (640)
+	 *  arg8 = extended memory size (8196)
+	 */
+	argv[0] = 8;
+	argv[1] = howto;
+	argv[2] = 0;		/* Boot device */
+	argv[3] = 0;		/* Cyl offset */
+	argv[4] = (int)esym;
+	argv[5] = (int)startaddr;
+	argv[6] = (int)&x_entry;
+	argv[7] = 0;
+	argv[8] = 0;
+
+	/****************************************************************/
+	/* copy that first page and overwrite any BIOS variables        */
+	/****************************************************************/
+	printf("entry point at 0x%x\n", (int)startaddr);
+	startprog(startaddr, argv);
+}
+