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99f39bebec
FreeDOS/kernel/main.c
Bart Oldeman 99f39bebec Truly got DOS=HIGH reporting for INT21/AX=0x3306 working now. 
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@182 6ac86273-5f31-0410-b378-82cca8765d1b
2001-03-30 20:11:14 +00:00

611 lines
18 KiB
C
Raw Blame History

/****************************************************************/
/* */
/* main.c */
/* DOS-C */
/* */
/* Main Kernel Functions */
/* */
/* Copyright (c) 1995, 1996 */
/* Pasquale J. Villani */
/* All Rights Reserved */
/* */
/* This file is part of DOS-C. */
/* */
/* DOS-C is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version */
/* 2, or (at your option) any later version. */
/* */
/* DOS-C is distributed in the hope that it will be useful, but */
/* WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
/* the GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public */
/* License along with DOS-C; see the file COPYING. If not, */
/* write to the Free Software Foundation, 675 Mass Ave, */
/* Cambridge, MA 02139, USA. */
/****************************************************************/
#include "init-mod.h"
#define MAIN
#include "portab.h"
#include "globals.h"
#ifdef VERSION_STRINGS
static BYTE *mainRcsId = "$Id$";
#endif
/*
* $Log$
* Revision 1.11 2001/03/30 20:11:14 bartoldeman
* Truly got DOS=HIGH reporting for INT21/AX=0x3306 working now.
*
* Revision 1.10 2001/03/30 19:30:06 bartoldeman
* Misc fixes and implementation of SHELLHIGH. See history.txt for details.
*
* Revision 1.9 2001/03/25 17:11:54 bartoldeman
* Fixed sys.com compilation. Updated to 2023. Also: see history.txt.
*
* Revision 1.8 2001/03/21 02:56:26 bartoldeman
* See history.txt for changes. Bug fixes and HMA support are the main ones.
*
* Revision 1.7 2000/08/06 05:50:17 jimtabor
* Add new files and update cvs with patches and changes
*
* Revision 1.6 2000/06/21 18:16:46 jimtabor
* Add UMB code, patch, and code fixes
*
* Revision 1.5 2000/05/26 19:25:19 jimtabor
* Read History file for Change info
*
* Revision 1.4 2000/05/25 20:56:21 jimtabor
* Fixed project history
*
* Revision 1.3 2000/05/17 19:15:12 jimtabor
* Cleanup, add and fix source.
*
* Revision 1.2 2000/05/08 04:30:00 jimtabor
* Update CVS to 2020
*
* Revision 1.1.1.1 2000/05/06 19:34:53 jhall1
* The FreeDOS Kernel. A DOS kernel that aims to be 100% compatible with
* MS-DOS. Distributed under the GNU GPL.
*
* Revision 1.14 2000/03/31 05:40:09 jtabor
* Added Eric W. Biederman Patches
*
* Revision 1.13 2000/03/09 06:07:11 kernel
* 2017f updates by James Tabor
*
* Revision 1.12 1999/09/23 04:40:48 jprice
* *** empty log message ***
*
* Revision 1.10 1999/08/25 03:18:09 jprice
* ror4 patches to allow TC 2.01 compile.
*
* Revision 1.9 1999/04/16 21:43:40 jprice
* ror4 multi-sector IO
*
* Revision 1.8 1999/04/16 12:21:22 jprice
* Steffen c-break handler changes
*
* Revision 1.7 1999/04/16 00:53:33 jprice
* Optimized FAT handling
*
* Revision 1.6 1999/04/12 03:21:17 jprice
* more ror4 patches. Changes for multi-block IO
*
* Revision 1.5 1999/04/11 04:33:39 jprice
* ror4 patches
*
* Revision 1.3 1999/04/04 22:57:47 jprice
* no message
*
* Revision 1.2 1999/04/04 18:51:43 jprice
* no message
*
* Revision 1.1.1.1 1999/03/29 15:41:18 jprice
* New version without IPL.SYS
*
* Revision 1.5 1999/02/08 05:55:57 jprice
* Added Pat's 1937 kernel patches
*
* Revision 1.4 1999/02/01 01:48:41 jprice
* Clean up; Now you can use hex numbers in config.sys. added config.sys screen function to change screen mode (28 or 43/50 lines)
*
* Revision 1.3 1999/01/30 08:28:12 jprice
* Clean up; Fixed bug with set attribute function.
*
* Revision 1.2 1999/01/22 04:13:26 jprice
* Formating
*
* Revision 1.1.1.1 1999/01/20 05:51:01 jprice
* Imported sources
*
*
* Rev 1.12 06 Dec 1998 8:45:30 patv
* Changed due to new I/O subsystem.
*
* Rev 1.11 22 Jan 1998 4:09:24 patv
* Fixed pointer problems affecting SDA
*
* Rev 1.10 04 Jan 1998 23:15:20 patv
* Changed Log for strip utility
*
* Rev 1.9 04 Jan 1998 17:26:16 patv
* Corrected subdirectory bug
*
* Rev 1.8 03 Jan 1998 8:36:48 patv
* Converted data area to SDA format
*
* Rev 1.7 06 Feb 1997 21:35:46 patv
* Modified to support new version format and changed debug message to
* output drive letter instead of number.
*
* Rev 1.6 22 Jan 1997 13:05:02 patv
* Now does correct default drive initialization.
*
* Rev 1.5 16 Jan 1997 12:47:00 patv
* pre-Release 0.92 feature additions
*
* Rev 1.3 29 May 1996 21:03:32 patv
* bug fixes for v0.91a
*
* Rev 1.2 19 Feb 1996 3:21:36 patv
* Added NLS, int2f and config.sys processing
*
* Rev 1.1 01 Sep 1995 17:54:18 patv
* First GPL release.
*
* Rev 1.0 02 Jul 1995 8:33:18 patv
* Initial revision.
*/
extern UWORD DaysSinceEpoch;
extern WORD days[2][13];
extern BYTE FAR * lpBase;
extern BYTE FAR * upBase;
INIT BOOL ReadATClock(BYTE *, BYTE *, BYTE *, BYTE *);
VOID FAR init_call_WritePCClock(ULONG);
VOID FAR reloc_call_WritePCClock(ULONG);
INIT VOID configDone(VOID);
INIT static void InitIO(void);
INIT static COUNT BcdToByte(COUNT);
INIT static COUNT BcdToDay(BYTE *);
INIT static VOID init_kernel(VOID);
INIT static VOID signon(VOID);
INIT VOID kernel(VOID);
INIT VOID FsConfig(VOID);
#ifdef __TURBOC__
void __int__(int); /* TC 2.01 requires this. :( -- ror4 */
#endif
INIT VOID main(void)
{
setvec(0, int0_handler); /* zero divide */
setvec(1, empty_handler); /* single step */
setvec(3, empty_handler); /* debug breakpoint */
#ifdef KDB
BootDrive = 1;
#endif
{ /* clear the BSS area (what normally the RTL does */
extern BYTE _bssstart[],_bssend[];
fmemset(_bssstart,0,_bssend-_bssstart);
}
init_kernel();
#ifdef DEBUG
/* Non-portable message kludge alert! */
printf("KERNEL: Boot drive = %c\n", 'A' + BootDrive - 1);
#endif
signon();
kernel();
}
/*
InitializeAllBPBs()
or MakeNortonDiskEditorHappy()
it has been determined, that FDOS's BPB tables are initialized,
only when used (like DIR H:).
at least one known utility (norton DE) seems to access them directly.
ok, so we access for all drives, that the stuff gets build
*/
void InitializeAllBPBs()
{
static char filename[] = "A:-@JUNK@-.TMP";
int drive,fileno;
for (drive = 'Z'; drive >= 'C'; drive--)
{
filename[0] = drive;
if ((fileno = dos_open((BYTE FAR *) filename, O_RDONLY)) >= 0)
dos_close(fileno);
}
}
INIT void init_kernel(void)
{
COUNT i;
os_major = MAJOR_RELEASE;
os_minor = MINOR_RELEASE;
cu_psp = DOS_PSP;
nblkdev = 0;
maxbksize = 0x200;
switchar = '/';
dosidle_flag = 1;
/* Init oem hook - returns memory size in KB */
ram_top = init_oem();
UMB_top = 0;
umb_start = 0;
/* Fake int 21h stack frame */
user_r = (iregs FAR *) DOS_PSP + 0xD0;
/* Set Init DTA to Tempbuffer */
dta = (BYTE FAR *) &TempBuffer;
#ifndef KDB
for (i = 0x20; i <= 0x3f; i++)
setvec(i, empty_handler);
#endif
/* Initialize IO subsystem */
InitIO();
syscon = (struct dhdr FAR *)&con_dev;
clock = (struct dhdr FAR *)&clk_dev;
#ifndef KDB
/* set interrupt vectors */
setvec(0x1b, got_cbreak);
setvec(0x20, int20_handler);
setvec(0x21, int21_handler);
setvec(0x22, int22_handler);
setvec(0x23, empty_handler);
setvec(0x24, int24_handler);
setvec(0x25, low_int25_handler);
setvec(0x26, low_int26_handler);
setvec(0x27, int27_handler);
setvec(0x28, int28_handler);
setvec(0x2a, int2a_handler);
setvec(0x2f, int2f_handler);
#endif
/* Initialize the screen handler for backspaces */
scr_pos = 0;
break_ena = TRUE;
/* Do first initialization of system variable buffers so that */
/* we can read config.sys later. */
lastdrive = Config.cfgLastdrive;
PreConfig();
/* Now config the temporary file system */
FsConfig();
#ifndef KDB
/* Now process CONFIG.SYS */
DoConfig();
/* and do final buffer allocation. */
PostConfig();
/* Init the file system on emore time */
FsConfig();
/* and process CONFIG.SYS one last time to load device drivers. */
DoConfig();
configDone();
/* Now config the final file system */
FsConfig();
#endif
/* Now to initialize all special flags, etc. */
mem_access_mode = FIRST_FIT;
verify_ena = FALSE;
InDOS = 0;
pDirFileNode = 0;
dosidle_flag = 0;
InitializeAllBPBs();
}
INIT VOID FsConfig(VOID)
{
REG COUNT i;
date Date;
time Time;
/* Get the start-up date and time */
Date = dos_getdate();
Time = dos_gettime();
/* Initialize the file tables */
for (i = 0; i < Config.cfgFiles; i++)
f_nodes[i].f_count = 0;
/* The system file tables need special handling and are "hand */
/* built. Included is the stdin, stdout, stdaux and atdprn. */
sfthead->sftt_next = (sfttbl FAR *) - 1;
sfthead->sftt_count = Config.cfgFiles;
for (i = 0; i < sfthead->sftt_count; i++)
{
sfthead->sftt_table[i].sft_count = 0;
sfthead->sftt_table[i].sft_status = -1;
}
/* 0 is /dev/con (stdin) */
sfthead->sftt_table[0].sft_count = 1;
sfthead->sftt_table[0].sft_mode = SFT_MREAD;
sfthead->sftt_table[0].sft_attrib = 0;
sfthead->sftt_table[0].sft_flags =
((con_dev.dh_attr & ~SFT_MASK) & ~SFT_FSHARED) | SFT_FDEVICE | SFT_FEOF | SFT_FCONIN | SFT_FCONOUT;
sfthead->sftt_table[0].sft_psp = DOS_PSP;
sfthead->sftt_table[0].sft_date = Date;
sfthead->sftt_table[0].sft_time = Time;
fbcopy(
(VOID FAR *) "CON ",
(VOID FAR *) sfthead->sftt_table[0].sft_name, 11);
sfthead->sftt_table[0].sft_dev = (struct dhdr FAR *)&con_dev;
/* 1 is /dev/con (stdout) */
sfthead->sftt_table[1].sft_count = 1;
sfthead->sftt_table[1].sft_mode = SFT_MWRITE;
sfthead->sftt_table[1].sft_attrib = 0;
sfthead->sftt_table[1].sft_flags =
((con_dev.dh_attr & ~SFT_MASK) & ~SFT_FSHARED) | SFT_FDEVICE | SFT_FEOF | SFT_FCONIN | SFT_FCONOUT;
sfthead->sftt_table[1].sft_psp = DOS_PSP;
sfthead->sftt_table[1].sft_date = Date;
sfthead->sftt_table[1].sft_time = Time;
fbcopy(
(VOID FAR *) "CON ",
(VOID FAR *) sfthead->sftt_table[1].sft_name, 11);
sfthead->sftt_table[1].sft_dev = (struct dhdr FAR *)&con_dev;
/* 2 is /dev/con (stderr) */
sfthead->sftt_table[2].sft_count = 1;
sfthead->sftt_table[2].sft_mode = SFT_MWRITE;
sfthead->sftt_table[2].sft_attrib = 0;
sfthead->sftt_table[2].sft_flags =
((con_dev.dh_attr & ~SFT_MASK) & ~SFT_FSHARED) | SFT_FDEVICE | SFT_FEOF | SFT_FCONIN | SFT_FCONOUT;
sfthead->sftt_table[2].sft_psp = DOS_PSP;
sfthead->sftt_table[2].sft_date = Date;
sfthead->sftt_table[2].sft_time = Time;
fbcopy(
(VOID FAR *) "CON ",
(VOID FAR *) sfthead->sftt_table[2].sft_name, 11);
sfthead->sftt_table[2].sft_dev = (struct dhdr FAR *)&con_dev;
/* 3 is /dev/aux */
sfthead->sftt_table[3].sft_count = 1;
sfthead->sftt_table[3].sft_mode = SFT_MRDWR;
sfthead->sftt_table[3].sft_attrib = 0;
sfthead->sftt_table[3].sft_flags =
((aux_dev.dh_attr & ~SFT_MASK) & ~SFT_FSHARED) | SFT_FDEVICE;
sfthead->sftt_table[3].sft_psp = DOS_PSP;
sfthead->sftt_table[3].sft_date = Date;
sfthead->sftt_table[3].sft_time = Time;
fbcopy(
(VOID FAR *) "AUX ",
(VOID FAR *) sfthead->sftt_table[3].sft_name, 11);
sfthead->sftt_table[3].sft_dev = (struct dhdr FAR *)&aux_dev;
/* 4 is /dev/prn */
sfthead->sftt_table[4].sft_count = 1;
sfthead->sftt_table[4].sft_mode = SFT_MWRITE;
sfthead->sftt_table[4].sft_attrib = 0;
sfthead->sftt_table[4].sft_flags =
((prn_dev.dh_attr & ~SFT_MASK) & ~SFT_FSHARED) | SFT_FDEVICE;
sfthead->sftt_table[4].sft_psp = DOS_PSP;
sfthead->sftt_table[4].sft_date = Date;
sfthead->sftt_table[4].sft_time = Time;
fbcopy(
(VOID FAR *) "PRN ",
(VOID FAR *) sfthead->sftt_table[4].sft_name, 11);
sfthead->sftt_table[4].sft_dev = (struct dhdr FAR *)&prn_dev;
/* Log-in the default drive. */
/* Get the boot drive from the ipl and use it for default. */
default_drive = BootDrive - 1;
/* Initialzie the current directory structures */
for (i = 0; i < lastdrive ; i++)
{
struct cds FAR *pcds_table = &CDSp->cds_table[i];
fbcopy((VOID FAR *) "A:\\\0",
(VOID FAR *) pcds_table->cdsCurrentPath, 4);
pcds_table->cdsCurrentPath[0] += i;
if (i < nblkdev)
{
pcds_table->cdsDpb = &blk_devices[i];
pcds_table->cdsFlags = CDSPHYSDRV;
}
else
{
pcds_table->cdsFlags = 0;
}
pcds_table->cdsStrtClst = 0xffff;
pcds_table->cdsParam = 0xffff;
pcds_table->cdsStoreUData = 0xffff;
pcds_table->cdsJoinOffset = 2;
}
/* Initialze the disk buffer management functions */
/* init_call_init_buffers(); done from CONFIG.C */
}
INIT VOID signon()
{
printf("\nFreeDOS Kernel compatibility %d.%d\n%s\n",
os_major, os_minor, copyright);
printf(os_release,
REVISION_MAJOR, REVISION_MINOR, REVISION_SEQ,
BUILD);
}
INIT void kernel()
{
seg asize;
BYTE FAR *ep,
*sp;
#ifndef KDB
static BYTE *path = "PATH=.";
#endif
#ifdef KDB
kdb();
#else
/* create the master environment area */
if (DosMemAlloc(0x20, FIRST_FIT, (seg FAR *) & master_env, (seg FAR *) & asize) < 0)
fatal("cannot allocate master environment space");
/* populate it with the minimum environment */
++master_env;
ep = MK_FP(master_env, 0);
for (sp = path; *sp != 0;)
*ep++ = *sp++;
*ep++ = '\0';
*ep++ = '\0';
*((int FAR *)ep) = 0;
ep += sizeof(int);
#endif
RootPsp = ~0;
init_call_p_0();
}
/* If cmdLine is NULL, this is an internal driver */
BOOL init_device(struct dhdr FAR * dhp, BYTE FAR * cmdLine, COUNT mode, COUNT r_top)
{
request rq;
ULONG memtop = ((ULONG) r_top) << 10;
ULONG maxmem = memtop - ((ULONG) FP_SEG(dhp) << 4);
if (maxmem >= 0x10000)
maxmem = 0xFFFF;
rq.r_unit = 0;
rq.r_status = 0;
rq.r_command = C_INIT;
rq.r_length = sizeof(request);
rq.r_endaddr = MK_FP(FP_SEG(dhp), maxmem);
rq.r_bpbptr = (void FAR *)(cmdLine ? cmdLine : "\n");
rq.r_firstunit = nblkdev;
execrh((request FAR *) & rq, dhp);
/*
* Added needed Error handle
*/
if (rq.r_status & S_ERROR)
return TRUE;
if(cmdLine){
if (mode)
upBase = rq.r_endaddr;
else
lpBase = rq.r_endaddr;
}
/* check for a block device and update device control block */
if (!(dhp->dh_attr & ATTR_CHAR) && (rq.r_nunits != 0))
{
REG COUNT Index;
for (Index = 0; Index < rq.r_nunits; Index++)
{
struct dpb *pblk_devices = &blk_devices[nblkdev];
if (nblkdev)
(pblk_devices-1)->dpb_next = pblk_devices;
pblk_devices->dpb_next = (void FAR *)0xFFFFFFFF;
pblk_devices->dpb_unit = nblkdev;
pblk_devices->dpb_subunit = Index;
pblk_devices->dpb_device = dhp;
pblk_devices->dpb_flags = M_CHANGED;
if ((CDSp != 0) && (nblkdev <= lastdrive))
{
CDSp->cds_table[nblkdev].cdsDpb = pblk_devices;
CDSp->cds_table[nblkdev].cdsFlags = CDSPHYSDRV;
}
++nblkdev;
}
}
DPBp = &blk_devices[0];
return FALSE;
}
INIT static void InitIO(void)
{
BYTE bcd_days[4],
bcd_minutes,
bcd_hours,
bcd_seconds;
ULONG ticks;
/* Initialize driver chain */
nul_dev.dh_next = (struct dhdr FAR *)&con_dev;
setvec(0x29, int29_handler); /* Requires Fast Con Driver */
init_device((struct dhdr FAR *)&con_dev, NULL, NULL, ram_top);
init_device((struct dhdr FAR *)&clk_dev, NULL, NULL, ram_top);
init_device((struct dhdr FAR *)&blk_dev, NULL, NULL, ram_top);
/* If AT clock exists, copy AT clock time to system clock */
if (!ReadATClock(bcd_days, &bcd_hours, &bcd_minutes, &bcd_seconds))
{
DaysSinceEpoch = DaysFromYearMonthDay(
100 * BcdToByte(bcd_days[3]) + BcdToByte(bcd_days[2]),
BcdToByte(bcd_days[1]),
BcdToByte(bcd_days[0]) );
/*
* This is a rather tricky calculation. The number of timer ticks per
* second is not exactly 18.2, but rather 0x1800b0 / 86400 = 19663 / 1080
* (the timer interrupt updates the midnight flag when the tick count
* reaches 0x1800b0). Fortunately, 86400 * 19663 = 1698883200 < ULONG_MAX,
* so we can simply multiply the number of seconds by 19663 without
* worrying about overflow. :) -- ror4
*/
ticks = (3600ul * BcdToByte(bcd_hours) +
60ul * BcdToByte(bcd_minutes) +
BcdToByte(bcd_seconds)) * 19663ul / 1080ul;
WritePCClock(ticks);
}
}
INIT static COUNT BcdToByte(COUNT x)
{
return ((((x) >> 4) & 0xf) * 10 + ((x) & 0xf));
}
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