(2006-08-06) rescue-bootcd

extra/syslinux-3.09/sample/hello2.c

@@ -0,0 +1,61 @@
+#ident "$Id: hello2.c,v 1.4 2004/12/14 22:46:25 hpa Exp $"
+/* ----------------------------------------------------------------------- *
+ *   
+ *   Copyright 2002 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * hello2.c
+ *
+ * Simple COM32 image
+ *
+ * This version shows how to use the bounce buffer for data transfer
+ * to the BIOS or COMBOOT system calls.
+ */
+
+#include <com32.h>
+
+#define NULL ((void *)0)
+
+static inline void memset(void *buf, int ch, unsigned int len)
+{
+  asm volatile("cld; rep; stosb"
+	       : "+D" (buf), "+c" (len) : "a" (ch) : "memory");
+}
+
+static void strcpy(char *dst, const char *src)
+{
+  while ( *src )
+    *dst++ = *src++;
+
+  *dst = '\0';
+}
+
+static void writemsg(const char *msg)
+{
+  com32sys_t inreg;
+
+  memset(&inreg, 0, sizeof inreg);
+
+  strcpy(__com32.cs_bounce, msg);
+  inreg.eax.w[0] = 0x0002;	/* Write string */
+  inreg.ebx.w[0] = OFFS(__com32.cs_bounce);
+  inreg.es       = SEG(__com32.cs_bounce);
+  __com32.cs_intcall(0x22, &inreg, NULL);
+};  
+
+int __start(void)
+{
+  writemsg("Hello, World!\r\n"
+	   "cmdline = ");
+  writemsg(__com32.cs_cmdline);
+  writemsg("\r\n");
+  return 0;
+}