freebsd-dev/usr.bin/doscmd/bios.c

/*
 * Copyright (c) 1992, 1993, 1996
 *	Berkeley Software Design, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Berkeley Software
 *	Design, Inc.
 *
 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	BSDI bios.c,v 2.3 1996/04/08 19:32:19 bostic Exp
 *
 * $FreeBSD$
 */

#include "doscmd.h"
#include "mouse.h"
#include "com.h"

#define	BIOS_copyright         0xfe000
#define	BIOS_reset             0xfe05b
#define	BIOS_nmi               0xfe2c3
#define	BIOS_hdisk_table       0xfe401
#define	BIOS_boot              0xfe6f2
#define	BIOS_comm_table        0xfe729
#define	BIOS_comm_io           0xfe739
#define	BIOS_keyboard_io       0xfe82e
#define	BIOS_keyboard_isr      0xfe987
#define	BIOS_fdisk_io          0xfec59
#define	BIOS_fdisk_isr         0xfef57
#define	BIOS_disk_parms        0xfefc7
#define	BIOS_printer_io        0xfefd2
#define	BIOS_video_io          0xff065
#define	BIOS_video_parms       0xff0a4
#define	BIOS_mem_size          0xff841
#define	BIOS_equipment         0xff84d
#define	BIOS_cassette_io       0xff859
#define	BIOS_video_font        0xffa6e
#define	BIOS_time_of_day       0xffe6e
#define	BIOS_timer_int         0xffea5
#define	BIOS_vector            0xffef3
#define	BIOS_dummy_iret        0xfff53
#define	BIOS_print_screen      0xfff54
#define	BIOS_hard_reset        0xffff0
#define	BIOS_date_stamp        0xffff5
#define	BIOS_hardware_id       0xffffe

static u_char disk_params[] = {
    0xdf, 2, 0x25, 2, 0x0f, 0x1b, 0xff, 0x54, 0xf6, 0x0f, 8,
};

static u_short comm_table[] = {
    1047, 768, 384, 192, 96, 48, 24, 12,
};

/* exports */

int		 nfloppies = 0;
int		 ndisks = 0;
int		 nserial = 0;
int		 nparallel = 0;
unsigned long	rom_config;

/*
** BIOS equipment list
*/
static void
int11(regcontext_t *REGS)
{
    R_AX = 
	(nfloppies ? 1:0) |	/* do we have any floppydisks? */
	(0x2 << 4) |		/* 80x25 colour */
	((nfloppies-1) << 6) |	/* how many floppies? */
	(nserial << 9) |	/* serial ports? */
	(nparallel << 14);	/* parallel ports? */
}

/*
** get installed memory
*/
static void
int12(regcontext_t *REGS)
{
    R_AX = 640;
}

/*
** assorted oddments
*/
static void
int15(regcontext_t *REGS)
{
    R_FLAGS &= ~PSL_C;

    switch (R_AH) {
    case 0x00:			/* Get Cassette Status */
	R_AH = 0x86;
	R_FLAGS |= PSL_C;	/* We don't support a cassette */
	break;
    case 0x04:			/* Set ABIOS table */
	R_FLAGS |= PSL_C;	/* We don't support it */
	break;
    case 0x4f:			/* Keyboard intercept */
	debug(D_TRAPS | 0x15, "BIOS: Keyboard intercept\n");
	/* Don't translate scan code. */
	break;
    case 0x88:
        get_raw_extmemory_info(REGS);
	break;
    case 0xc0:			/* Get configuration */
	debug(D_TRAPS | 0x15, "BIOS: Get configuration\n");
	PUTVEC(R_ES, R_BX, rom_config);
        R_AH = 0;
	break;
    case 0xc1:			/* Get extended BIOS data area */
	R_FLAGS |= PSL_C;
	break;
    case 0xc2:			/* Pointing device */
	debug(D_TRAPS | 0x15, "BIOS: Pointing device?\n");
	R_FLAGS |= PSL_C;
	R_AH = 5;	/* No pointer */
	break;
    default:
	unknown_int2(0x15, R_AX, REGS);
	break;
    }
}

void
bios_init(void)
{
    int i, j, k;
    u_char *jtab;
    struct timeval tv;
    time_t tv_sec;
    struct timezone tz;
    struct tm tm;
    u_long vec;

    strcpy((char *)BIOS_copyright,
	   "Copyright (C) 1993 Krystal Technologies/BSDI");

    *(u_short *)BIOS_reset = 0xffcd;
    *(u_short *)BIOS_nmi = 0xffcd;
    *(u_short *)BIOS_boot = 0xffcd;
    *(u_short *)BIOS_comm_io = 0xffcd;
    *(u_short *)BIOS_keyboard_io = 0xffcd;
    *(u_short *)BIOS_keyboard_isr = 0xffcd;
    *(u_short *)BIOS_fdisk_io = 0xffcd;
    *(u_short *)BIOS_fdisk_isr = 0xffcd;
    *(u_short *)BIOS_printer_io = 0xffcd;
    *(u_short *)BIOS_video_io = 0xffcd;
    *(u_short *)BIOS_cassette_io = 0xffcd;
    *(u_short *)BIOS_time_of_day = 0xffcd;
    *(u_short *)BIOS_timer_int = 0xffcd;
    *(u_short *)BIOS_dummy_iret = 0xffcd;
    *(u_short *)BIOS_print_screen = 0xffcd;
    *(u_short *)BIOS_hard_reset = 0xffcd;
    *(u_short *)BIOS_mem_size = 0xffcd;
    *(u_short *)BIOS_equipment = 0xffcd;
    *(u_short *)BIOS_vector = 0xffcd;
    *(u_char *)0xffff2 = 0xcf;			/* IRET */

    memcpy((u_char *)BIOS_disk_parms, disk_params, sizeof(disk_params));
    memcpy((u_char *)BIOS_comm_table, comm_table, sizeof(comm_table));

    *(u_short *)BIOS_video_font = 0xffcd;
	
    jtab = (u_char *)BIOS_date_stamp;
    *jtab++ = '1';
    *jtab++ = '0';
    *jtab++ = '/';
    *jtab++ = '3';
    *jtab++ = '1';
    *jtab++ = '/';
    *jtab++ = '9';
    *jtab++ = '3';

    *(u_char *)BIOS_hardware_id = 0xfc;           /* Identify as a PC/AT */

    /*
     * Interrupt revectors F000:0000 - F000:03ff
     */
    for (i = 0, j = 0, k = 0; i < 0x100; ++i) {
	if ((i >= 0x60 && i < 0x68) ||
	    (i >= 0x78 && i < 0xe2))
	    continue;
	if ((i >= 0x00 && i < 0x2f) ||
	    (i >= 0x30 && i < 0xfe)) {
	    ivec[i] = 0xF0300000L | (k * 1);
	    jtab = (u_char *)VECPTR(ivec[i]);
	    *jtab++ = 0xf4;	/* HLT */
	    ++k;
	} else {
	    ivec[i] = 0xF0000000L | (j * 6);
	    jtab = (u_char *)VECPTR(ivec[i]);
	    *jtab++ = 0xcd;	/* INT i */
	    *jtab++ = i;
	    *jtab++ = 0xca;	/* RETF 2 */
	    *jtab++ = 2;
	    *jtab++ = 0;
	    ++j;
	}
    }

    /*
     * Misc variables from F000:0400 - F000:0fff
     */
    rom_config = 0xF0000400;
    jtab = (u_char *)VECPTR(rom_config);
    *jtab++ = 20;	    /* length of entry */
    *jtab++ = 0;
    *jtab++ = *(u_char *)BIOS_hardware_id;
    *jtab++ = 0x00;         /* Sub model */
    *jtab++ = 0x01;         /* Bios Rev Enhanced kbd w/3.5" floppy */
    *jtab++ = 0x20;         /* real time clock present */
    *jtab++ = 0;            /* Reserved */
    *jtab++ = 0;
    *jtab++ = 0;
    *jtab++ = 0;
    strcpy((char *)jtab, "BSDI BIOS");
    *jtab += 10;

    InDOS = jtab++;
    *InDOS = 0;

    mouse_area = jtab;
    jtab += 0x10;

    *(u_short *)&BIOSDATA[0x10] = 
	(1 << 0) |		/* Diskette avail for boot */
	(1 << 1) |		/* Math co-processor */
	(nmice << 2) |		/* No pointing device */
	(2 << 4) |		/* Initial video (80 x 25 C) */
	((nfloppies - 1) << 6) |	/* Number of floppies - 1 */
	(nserial << 9) |	/* Number of serial devices */
	(nparallel << 14);	/* Number of parallel devices */


    *(u_short *)&BIOSDATA[0x13] = 640;	/* Amount of memory */
    BIOSDATA[0x75] = ndisks;		/* number of fixed disks */
    
    BIOSDATA[0x8F] = 0;
    if (nfloppies >= 1) {
	BIOSDATA[0x8F] |= 0x04;
	BIOSDATA[0x90] = 0x40;
    }
    if (nfloppies >= 2) {
	BIOSDATA[0x8F] |= 0x40;
	BIOSDATA[0x91] = 0x40;
    }

    gettimeofday(&tv, &tz);
    tv_sec = tv.tv_sec;
    tm = *localtime(&tv_sec);
    *(u_long *)&BIOSDATA[0x6c] =
	(((tm.tm_hour * 60 + tm.tm_min) * 60) + tm.tm_sec) * 182 / 10; 

    vec = insert_softint_trampoline();
    ivec[0x11] = vec;
    register_callback(vec, int11, "int 11");
    
    vec = insert_softint_trampoline();
    ivec[0x12] = vec;
    register_callback(vec, int12, "int 12");

    vec = insert_softint_trampoline();
    ivec[0x14] = vec;
    register_callback(vec, int14, "int 14");

    vec = insert_softint_trampoline();
    ivec[0x15] = vec;
    register_callback(vec, int15, "int 15");

    vec = insert_softint_trampoline();
    ivec[0x16] = vec;
    register_callback(vec, int16, "int 16");

    vec = insert_softint_trampoline();
    ivec[0x17] = vec;
    register_callback(vec, int17, "int 17");

    vec = insert_softint_trampoline();
    ivec[0x1a] = vec;
    register_callback(vec, int1a, "int 1a");
}