Initial source

1 files changed, 146 insertions, 0 deletions

diff --git a/i386/dos/i16/i16_dos.h b/i386/dos/i16/i16_dos.h
new file mode 100644
index 0000000..27b0ca4
--- /dev/null
+++ b/i386/dos/i16/i16_dos.h
@@ -0,0 +1,146 @@
+/* 
+ * 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
+ */
+#ifndef _I16DOS_H_
+#define _I16DOS_H_
+
+#include <mach/inline.h>
+#include <mach/machine/far_ptr.h>
+
+
+/* Returns 16-bit DOS version number:
+   major version number in high byte, minor in low byte.  */
+MACH_INLINE unsigned short i16_dos_version(void)
+{
+	unsigned short dos_version_swapped;
+	asm volatile("int $0x21" : "=a" (dos_version_swapped) : "a" (0x3000));
+	return (dos_version_swapped >> 8) | (dos_version_swapped << 8);
+}
+
+MACH_INLINE void i16_dos_putchar(int c)
+{
+	asm volatile("int $0x21" : : "a" (0x0200), "d" (c));
+}
+
+MACH_INLINE void i16_dos_exit(int rc)
+{
+	asm volatile("int $0x21" : : "a" (0x4c00 | (rc & 0xff)));
+}
+
+MACH_INLINE void i16_dos_get_int_vec(int vecnum, struct far_pointer_16 *out_vec)
+{
+	asm volatile("
+		pushw	%%es
+		int	$0x21
+		movw	%%es,%0
+		popw	%%es
+	" : "=r" (out_vec->seg), "=b" (out_vec->ofs)
+	  : "a" (0x3500 | vecnum));
+}
+
+MACH_INLINE void i16_dos_set_int_vec(int vecnum, struct far_pointer_16 *new_vec)
+{
+	asm volatile("
+		pushw	%%ds
+		movw	%1,%%ds
+		int	$0x21
+		popw	%%ds
+	" :
+	  : "a" (0x2500 | vecnum),
+	    "r" (new_vec->seg), "d" (new_vec->ofs));
+}
+
+/* Open a DOS file and return the new file handle.
+   Returns -1 if an error occurs.  */
+MACH_INLINE int i16_dos_open(const char *filename, int access)
+{
+	int fh;
+	asm volatile("
+		int	$0x21
+		jnc	1f
+		movl	$-1,%%eax
+	1:
+	" : "=a" (fh) : "a" (0x3d00 | access), "d" (filename));
+	return fh;
+}
+
+MACH_INLINE void i16_dos_close(int fh)
+{
+	asm volatile("int $0x21" : : "a" (0x3e00), "b" (fh));
+}
+
+MACH_INLINE int i16_dos_get_device_info(int fh)
+{
+	int info_word;
+	asm volatile("
+		int	$0x21
+		jnc	1f
+		movl	$-1,%%edx
+	1:
+	" : "=d" (info_word) : "a" (0x4400), "b" (fh), "d" (0));
+	return info_word;
+}
+
+MACH_INLINE int i16_dos_get_output_status(int fh)
+{
+	int status;
+	asm volatile("
+		int	$0x21
+		movzbl	%%al,%%eax
+		jnc	1f
+		movl	$-1,%%eax
+	1:
+	" : "=a" (status) : "a" (0x4407), "b" (fh));
+	return status;
+}
+
+MACH_INLINE int i16_dos_alloc(unsigned short *inout_paras)
+{
+	int seg;
+	asm volatile("
+		int	$0x21
+		jnc	1f
+		movl	$-1,%%eax
+	1:
+	" : "=a" (seg), "=b" (*inout_paras)
+	  : "a" (0x4800), "b" (*inout_paras));
+	return seg;
+}
+
+MACH_INLINE int i16_dos_free(unsigned short seg)
+{
+	asm volatile("
+		pushw	%%es
+		movw	%1,%%es
+		int	$0x21
+		popw	%%es
+	" : : "a" (0x4900), "r" (seg) : "eax");
+}
+
+MACH_INLINE unsigned short i16_dos_get_psp_seg(void)
+{
+	unsigned short psp_seg;
+	asm volatile("int $0x21" : "=b" (psp_seg) : "a" (0x6200));
+	return psp_seg;
+}
+
+#endif _I16DOS_H_