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authorhpa <hpa>2003-11-24 02:44:42 +0000
committerhpa <hpa>2003-11-24 02:44:42 +0000
commit43cf4dda600db1ccd05d9788c7b1da0cde7c0413 (patch)
tree0c69eaa8d2e0f49bc4ea8770762a97d4552771ad /sample/c32echo.c
parent4a10396ab1f114fc37fa8f276e047fe3c283671c (diff)
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Fix COMBOOT/COM32 command-line generation.syslinux-2.08-pre1
Add test programs.
Diffstat (limited to 'sample/c32echo.c')
-rw-r--r--sample/c32echo.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/sample/c32echo.c b/sample/c32echo.c
new file mode 100644
index 00000000..9733d41f
--- /dev/null
+++ b/sample/c32echo.c
@@ -0,0 +1,49 @@
+#ident "$Id$"
+/* ----------------------------------------------------------------------- *
+ *
+ * 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,
+ * Bostom MA 02111-1307, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * c32echo.c
+ *
+ * Simple COM32 program which only prints out its own command line
+ */
+
+#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");
+}
+
+int __start(void)
+{
+ com32sys_t inreg, outreg;
+ const char *p;
+
+ memset(&inreg, 0, sizeof inreg);
+ inreg.eax.b[1] = 0x02; /* Write Character */
+
+ for ( p = __com32.cs_cmdline ; *p ; p++ ) {
+ inreg.edx.b[0] = *p;
+ __com32.cs_intcall(0x21, &inreg, NULL);
+ }
+
+ inreg.edx.b[0] = '\r';
+ __com32.cs_intcall(0x21, &inreg, NULL);
+ inreg.edx.b[0] = '\n';
+ __com32.cs_intcall(0x21, &inreg, NULL);
+
+ return 0;
+}