1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/sample/fd.c b/contrib/syslinux-4.02/sample/fd.c
new file mode 100644
index 0000000..a1b1a51
--- /dev/null
+++ b/contrib/syslinux-4.02/sample/fd.c
@@ -0,0 +1,59 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2003-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   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, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * fd.c
+ *
+ * Chainload a floppy disk (currently rather braindead.)
+ */
+
+#include <com32.h>
+#define NULL ((void *)0)
+
+int printf(const char *, ...);
+unsigned int atou(const char *);
+
+int __start(void)
+{
+    int whichfd = atou(__com32.cs_cmdline);
+    static com32sys_t inreg, outreg;	/* In bss, so zeroed automatically */
+    int retry;
+
+    for (retry = 0; retry < 6; retry++) {
+	printf(">");
+	inreg.eax.w[0] = 0x0201;	/* Read one sector */
+	inreg.ecx.w[0] = 0x0001;	/* Cyl 0 sector 1 */
+	inreg.edx.b[1] = 0;	/* Head 0 */
+	inreg.edx.b[0] = whichfd;	/* Drive number */
+	inreg.es = SEG(__com32.cs_bounce);	/* Read into the bounce buffer */
+	inreg.ebx.w[0] = OFFS(__com32.cs_bounce);
+	__com32.cs_intcall(0x13, &inreg, &outreg);
+
+	if ((outreg.eflags.l & 1) == 0)
+	    break;
+    }
+
+    if ((outreg.eflags.l & 1) == 0) {
+	printf("!\n");
+	inreg.eax.w[0] = 0x000d;
+	inreg.edx.w[0] = 0;
+	inreg.edi.l = (uint32_t) __com32.cs_bounce;
+	inreg.ecx.l = 512;
+	inreg.ebx.l = whichfd & 0xff;
+	inreg.esi.l = 0;	/* No partitions */
+	inreg.ds = 0;		/* No partitions */
+	__com32.cs_intcall(0x22, &inreg, NULL);
+    }
+
+    /* If we get here, badness happened */
+    return 255;
+}