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authorThomas Bushnell <thomas@gnu.org>1997-02-25 21:28:37 +0000
committerThomas Bushnell <thomas@gnu.org>1997-02-25 21:28:37 +0000
commitf07a4c844da9f0ecae5bbee1ab94be56505f26f7 (patch)
tree12b07c7e578fc1a5f53dbfde2632408491ff2a70 /i386/dos/i16/i16_dos.h
Initial source
Diffstat (limited to 'i386/dos/i16/i16_dos.h')
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diff --git a/i386/dos/i16/i16_dos.h b/i386/dos/i16/i16_dos.h
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+++ 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_