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

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