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Annotation of Gnu-Mach/i386/pc/i16/i16_bios.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 _I16_BIOS_H_
        !            24: #define _I16_BIOS_H_
        !            25: 
        !            26: #include <mach/inline.h>
        !            27: 
        !            28: 
        !            29: MACH_INLINE void i16_bios_putchar(int c)
        !            30: {
        !            31:        asm volatile("int $0x10" : : "a" (0x0e00 | (c & 0xff)), "b" (0x07));
        !            32: }
        !            33: 
        !            34: MACH_INLINE int i16_bios_getchar()
        !            35: {
        !            36:        int c;
        !            37:        asm volatile("int $0x16" : "=a" (c) : "a" (0x0000));
        !            38:        c &= 0xff;
        !            39:        return c;
        !            40: }
        !            41: 
        !            42: MACH_INLINE void i16_bios_warm_boot(void)
        !            43: {
        !            44:        asm volatile("
        !            45:                cli
        !            46:                movw    $0x40,%ax
        !            47:                movw    %ax,%ds
        !            48:                movw    $0x1234,0x72
        !            49:                ljmp    $0xffff,$0x0000
        !            50:        ");
        !            51: }
        !            52: 
        !            53: MACH_INLINE void i16_bios_cold_boot(void)
        !            54: {
        !            55:        asm volatile("
        !            56:                cli
        !            57:                movw    $0x40,%ax
        !            58:                movw    %ax,%ds
        !            59:                movw    $0x0000,0x72
        !            60:                ljmp    $0xffff,$0x0000
        !            61:        ");
        !            62: }
        !            63: 
        !            64: MACH_INLINE unsigned char i16_bios_copy_ext_mem(
        !            65:        unsigned src_la, unsigned dest_la, unsigned short word_count)
        !            66: {
        !            67:        char buf[48];
        !            68:        unsigned short i, rc;
        !            69: 
        !            70:        /* Initialize the descriptor structure.  */
        !            71:        for (i = 0; i < sizeof(buf); i++)
        !            72:                buf[i] = 0;
        !            73:        *((unsigned short*)(buf+0x10)) = 0xffff; /* source limit */
        !            74:        *((unsigned long*)(buf+0x12)) = src_la; /* source linear address */
        !            75:        *((unsigned char*)(buf+0x15)) = 0x93; /* source access rights */
        !            76:        *((unsigned short*)(buf+0x18)) = 0xffff; /* dest limit */
        !            77:        *((unsigned long*)(buf+0x1a)) = dest_la; /* dest linear address */
        !            78:        *((unsigned char*)(buf+0x1d)) = 0x93; /* dest access rights */
        !            79: 
        !            80: #if 0
        !            81:        i16_puts("buf:");
        !            82:        for (i = 0; i < sizeof(buf); i++)
        !            83:                i16_writehexb(buf[i]);
        !            84:        i16_puts("");
        !            85: #endif
        !            86: 
        !            87:        /* Make the BIOS call to perform the copy.  */
        !            88:        asm volatile("
        !            89:                int     $0x15
        !            90:        " : "=a" (rc)
        !            91:          : "a" ((unsigned short)0x8700),
        !            92:            "c" (word_count),
        !            93:            "S" ((unsigned short)(unsigned)buf));
        !            94: 
        !            95:        return rc >> 8;
        !            96: }
        !            97: 
        !            98: #endif _I16_BIOS_H_

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