Return to i16_dos.h CVS log

Up to [GnuMach] / Gnu-Mach / i386 / dos / i16

Annotation of Gnu-Mach/i386/dos/i16/i16_dos.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Copyright (c) 1995-1994 The University of Utah and
                      3:  * the Computer Systems Laboratory at the University of Utah (CSL).
                      4:  * All rights reserved.
                      5:  *
                      6:  * Permission to use, copy, modify and distribute this software is hereby
                      7:  * granted provided that (1) source code retains these copyright, permission,
                      8:  * and disclaimer notices, and (2) redistributions including binaries
                      9:  * reproduce the notices in supporting documentation, and (3) all advertising
                     10:  * materials mentioning features or use of this software display the following
                     11:  * acknowledgement: ``This product includes software developed by the
                     12:  * Computer Systems Laboratory at the University of Utah.''
                     13:  *
                     14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
                     15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
                     16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     17:  *
                     18:  * CSL requests users of this software to return to [email protected] any
                     19:  * improvements that they make and grant CSL redistribution rights.
                     20:  *
                     21:  *      Author: Bryan Ford, University of Utah CSL
                     22:  */
                     23: #ifndef _I16DOS_H_
                     24: #define _I16DOS_H_
                     25: 
                     26: #include <mach/inline.h>
                     27: #include <mach/machine/far_ptr.h>
                     28: 
                     29: 
                     30: /* Returns 16-bit DOS version number:
                     31:    major version number in high byte, minor in low byte.  */
                     32: MACH_INLINE unsigned short i16_dos_version(void)
                     33: {
                     34:        unsigned short dos_version_swapped;
                     35:        asm volatile("int $0x21" : "=a" (dos_version_swapped) : "a" (0x3000));
                     36:        return (dos_version_swapped >> 8) | (dos_version_swapped << 8);
                     37: }
                     38: 
                     39: MACH_INLINE void i16_dos_putchar(int c)
                     40: {
                     41:        asm volatile("int $0x21" : : "a" (0x0200), "d" (c));
                     42: }
                     43: 
                     44: MACH_INLINE void i16_dos_exit(int rc)
                     45: {
                     46:        asm volatile("int $0x21" : : "a" (0x4c00 | (rc & 0xff)));
                     47: }
                     48: 
                     49: MACH_INLINE void i16_dos_get_int_vec(int vecnum, struct far_pointer_16 *out_vec)
                     50: {
                     51:        asm volatile("
                     52:                pushw   %%es
                     53:                int     $0x21
                     54:                movw    %%es,%0
                     55:                popw    %%es
                     56:        " : "=r" (out_vec->seg), "=b" (out_vec->ofs)
                     57:          : "a" (0x3500 | vecnum));
                     58: }
                     59: 
                     60: MACH_INLINE void i16_dos_set_int_vec(int vecnum, struct far_pointer_16 *new_vec)
                     61: {
                     62:        asm volatile("
                     63:                pushw   %%ds
                     64:                movw    %1,%%ds
                     65:                int     $0x21
                     66:                popw    %%ds
                     67:        " :
                     68:          : "a" (0x2500 | vecnum),
                     69:            "r" (new_vec->seg), "d" (new_vec->ofs));
                     70: }
                     71: 
                     72: /* Open a DOS file and return the new file handle.
                     73:    Returns -1 if an error occurs.  */
                     74: MACH_INLINE int i16_dos_open(const char *filename, int access)
                     75: {
                     76:        int fh;
                     77:        asm volatile("
                     78:                int     $0x21
                     79:                jnc     1f
                     80:                movl    $-1,%%eax
                     81:        1:
                     82:        " : "=a" (fh) : "a" (0x3d00 | access), "d" (filename));
                     83:        return fh;
                     84: }
                     85: 
                     86: MACH_INLINE void i16_dos_close(int fh)
                     87: {
                     88:        asm volatile("int $0x21" : : "a" (0x3e00), "b" (fh));
                     89: }
                     90: 
                     91: MACH_INLINE int i16_dos_get_device_info(int fh)
                     92: {
                     93:        int info_word;
                     94:        asm volatile("
                     95:                int     $0x21
                     96:                jnc     1f
                     97:                movl    $-1,%%edx
                     98:        1:
                     99:        " : "=d" (info_word) : "a" (0x4400), "b" (fh), "d" (0));
                    100:        return info_word;
                    101: }
                    102: 
                    103: MACH_INLINE int i16_dos_get_output_status(int fh)
                    104: {
                    105:        int status;
                    106:        asm volatile("
                    107:                int     $0x21
                    108:                movzbl  %%al,%%eax
                    109:                jnc     1f
                    110:                movl    $-1,%%eax
                    111:        1:
                    112:        " : "=a" (status) : "a" (0x4407), "b" (fh));
                    113:        return status;
                    114: }
                    115: 
                    116: MACH_INLINE int i16_dos_alloc(unsigned short *inout_paras)
                    117: {
                    118:        int seg;
                    119:        asm volatile("
                    120:                int     $0x21
                    121:                jnc     1f
                    122:                movl    $-1,%%eax
                    123:        1:
                    124:        " : "=a" (seg), "=b" (*inout_paras)
                    125:          : "a" (0x4800), "b" (*inout_paras));
                    126:        return seg;
                    127: }
                    128: 
                    129: MACH_INLINE int i16_dos_free(unsigned short seg)
                    130: {
                    131:        asm volatile("
                    132:                pushw   %%es
                    133:                movw    %1,%%es
                    134:                int     $0x21
                    135:                popw    %%es
                    136:        " : : "a" (0x4900), "r" (seg) : "eax");
                    137: }
                    138: 
                    139: MACH_INLINE unsigned short i16_dos_get_psp_seg(void)
                    140: {
                    141:        unsigned short psp_seg;
                    142:        asm volatile("int $0x21" : "=b" (psp_seg) : "a" (0x6200));
                    143:        return psp_seg;
                    144: }
                    145: 
                    146: #endif _I16DOS_H_

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.