OS_Develop/FreeDOS
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FreeDOS/kernel/main.c
Bart Oldeman 3e3c05ff22 From Lucho: enable interactive re-execution of the SHELL. 
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@795 6ac86273-5f31-0410-b378-82cca8765d1b
2004-03-07 12:19:43 +00:00

669 lines
17 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, Inc., */
/* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */
/****************************************************************/
#include "portab.h"
#include "init-mod.h"
#include "dyndata.h"
#ifdef VERSION_STRINGS
static BYTE *mainRcsId =
"$Id$";
#endif
static char copyright[] =
"(C) Copyright 1995-2004 Pasquale J. Villani and The FreeDOS Project.\n"
"All Rights Reserved. This is free software and comes with ABSOLUTELY NO\n"
"WARRANTY; you can redistribute it and/or modify it under the terms of the\n"
"GNU General Public License as published by the Free Software Foundation;\n"
"either version 2, or (at your option) any later version.\n";
struct _KernelConfig InitKernelConfig = { "", 0, 0, 0, 0, 0, 0, 0 };
STATIC VOID InitIO(void);
STATIC VOID update_dcb(struct dhdr FAR *);
STATIC VOID init_kernel(VOID);
STATIC VOID signon(VOID);
STATIC VOID kernel(VOID);
STATIC VOID FsConfig(VOID);
STATIC VOID InitPrinters(VOID);
STATIC VOID InitSerialPorts(VOID);
STATIC void CheckContinueBootFromHarddisk(void);
#ifdef _MSC_VER
BYTE _acrtused = 0;
__segment DosDataSeg = 0; /* serves for all references to the DOS DATA segment
necessary for MSC+our funny linking model
*/
__segment DosTextSeg = 0;
struct lol FAR *LoL;
#else
struct lol FAR *LoL = &DATASTART;
#endif
VOID ASMCFUNC FreeDOSmain(void)
{
unsigned char drv;
#ifdef _MSC_VER
extern FAR prn_dev;
DosDataSeg = (__segment) & DATASTART;
DosTextSeg = (__segment) & prn_dev;
LoL = &DATASTART;
#endif
/* if the kernel has been UPX'ed,
CONFIG info is stored at 50:e2 ..fc
and the bootdrive (passed from BIOS)
at 50:e0
*/
if (fmemcmp(MK_FP(0x50,0xe0+2),"CONFIG",6) == 0) /* UPX */
{
fmemcpy(&InitKernelConfig, MK_FP(0,0x5e0+2), sizeof(InitKernelConfig));
drv = *(UBYTE FAR *)MK_FP(0,0x5e0) + 1;
*(DWORD FAR *)MK_FP(0,0x5e0+2) = 0;
}
else
{
drv = LoL->BootDrive + 1;
*(UBYTE FAR *)MK_FP(0,0x5e0) = drv - 1;
fmemcpy(&InitKernelConfig, &LowKernelConfig, sizeof(InitKernelConfig));
}
if (drv >= 0x80)
drv = 3; /* C: */
LoL->BootDrive = drv;
setvec(0, int0_handler); /* zero divide */
setvec(1, empty_handler); /* single step */
setvec(3, empty_handler); /* debug breakpoint */
setvec(6, int6_handler); /* invalid opcode */
CheckContinueBootFromHarddisk();
/* clear the Init BSS area (what normally the RTL does */
memset(_ib_start, 0, _ib_end - _ib_start);
signon();
init_kernel();
#ifdef DEBUG
/* Non-portable message kludge alert! */
printf("KERNEL: Boot drive = %c\n", 'A' + LoL->BootDrive - 1);
#endif
DoInstall();
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(VOID)
{
static char filename[] = "A:-@JUNK@-.TMP";
int drive, fileno;
for (drive = 'C'; drive < 'A' + LoL->nblkdev; drive++)
{
filename[0] = drive;
if ((fileno = open(filename, O_RDONLY)) >= 0)
close(fileno);
}
}
STATIC void init_kernel(void)
{
COUNT i;
LoL->os_setver_major = LoL->os_major = MAJOR_RELEASE;
LoL->os_setver_minor = LoL->os_minor = MINOR_RELEASE;
/* Init oem hook - returns memory size in KB */
ram_top = init_oem();
/* move kernel to high conventional RAM, just below the init code */
lpTop = MK_FP(ram_top * 64 - (FP_OFF(_init_end) + 15) / 16 -
(FP_OFF(_HMATextEnd) + 15) / 16, 0);
MoveKernel(FP_SEG(lpTop));
lpOldTop = lpTop = MK_FP(FP_SEG(lpTop) - 0xfff, 0xfff0);
for (i = 0x20; i <= 0x3f; i++)
setvec(i, empty_handler);
/* Initialize IO subsystem */
InitIO();
InitPrinters();
InitSerialPorts();
/* 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);
pokeb(0, 0x30 * 4, 0xea);
pokel(0, 0x30 * 4 + 1, (ULONG)cpm_entry);
init_PSPSet(DOS_PSP);
set_DTA(MK_FP(DOS_PSP, 0x80));
init_PSPInit(DOS_PSP);
((psp far *)MK_FP(DOS_PSP, 0))->ps_environ = DOS_PSP + 8;
Init_clk_driver();
/* Do first initialization of system variable buffers so that */
/* we can read config.sys later. */
LoL->lastdrive = Config.cfgLastdrive;
/* init_device((struct dhdr FAR *)&blk_dev, NULL, 0, &ram_top); */
blk_dev.dh_name[0] = dsk_init();
PreConfig();
/* Number of units */
if (blk_dev.dh_name[0] > 0)
update_dcb(&blk_dev);
/* Now config the temporary file system */
FsConfig();
/* Now process CONFIG.SYS */
DoConfig(0);
DoConfig(1);
/* initialize near data and MCBs */
PreConfig2();
/* and process CONFIG.SYS one last time for device drivers */
DoConfig(2);
/* Close all (device) files */
for (i = 0; i < 20; i++)
close(i);
/* and do final buffer allocation. */
PostConfig();
/* Init the file system one more time */
FsConfig();
configDone();
InitializeAllBPBs();
}
STATIC VOID FsConfig(VOID)
{
struct dpb FAR *dpb = LoL->DPBp;
int i;
/* Initialize the current directory structures */
for (i = 0; i < LoL->lastdrive; i++)
{
struct cds FAR *pcds_table = &LoL->CDSp[i];
fmemcpy(pcds_table->cdsCurrentPath, "A:\\\0", 4);
pcds_table->cdsCurrentPath[0] += i;
if (i < LoL->nblkdev && (ULONG) dpb != 0xffffffffl)
{
pcds_table->cdsDpb = dpb;
pcds_table->cdsFlags = CDSPHYSDRV;
dpb = dpb->dpb_next;
}
else
{
pcds_table->cdsFlags = 0;
}
pcds_table->cdsStrtClst = 0xffff;
pcds_table->cdsParam = 0xffff;
pcds_table->cdsStoreUData = 0xffff;
pcds_table->cdsJoinOffset = 2;
}
/* Log-in the default drive. */
init_setdrive(LoL->BootDrive - 1);
/* The system file tables need special handling and are "hand */
/* built. Included is the stdin, stdout, stdaux and stdprn. */
/* a little bit of shuffling is necessary for compatibility */
/* sft_idx=0 is /dev/aux */
open("AUX", O_RDWR);
/* handle 1, sft_idx=1 is /dev/con (stdout) */
open("CON", O_RDWR);
/* 3 is /dev/aux */
dup2(STDIN, STDAUX);
/* 0 is /dev/con (stdin) */
dup2(STDOUT, STDIN);
/* 2 is /dev/con (stdin) */
dup2(STDOUT, STDERR);
/* 4 is /dev/prn */
open("PRN", O_WRONLY);
/* Initialize the disk buffer management functions */
/* init_call_init_buffers(); done from CONFIG.C */
}
STATIC VOID signon()
{
printf("\r%S", MK_FP(FP_SEG(LoL), FP_OFF(LoL->os_release)));
printf("Kernel compatibility %d.%d - ", MAJOR_RELEASE, MINOR_RELEASE);
printf(
#if defined(__BORLANDC__)
"BORLANDC"
#elif defined(__TURBOC__)
"TURBOC"
#elif defined(_MSC_VER)
"MSC"
#elif defined(__WATCOMC__)
"WATCOMC"
#elif defined(__GNUC__)
"GNUC" /* this is hypothetical only */
#else
#error Unknown compiler
generate some bullshit error here, as the compiler should be known
#endif
#if defined (I386)
" - 80386 CPU required"
#elif defined (I186)
" - 80186 CPU required"
#endif
#ifdef WITHFAT32
" - FAT32 support"
#endif
"\n\n%S", (void FAR *)copyright);
}
STATIC void kernel()
{
CommandTail Cmd;
if (master_env[0] == '\0') /* some shells panic on empty master env. */
strcpy(master_env, "PATH=.");
fmemcpy(MK_FP(DOS_PSP + 8, 0), master_env, sizeof(master_env));
/* process 0 */
/* Execute command.com from the drive we just booted from */
memset(Cmd.ctBuffer, 0, sizeof(Cmd.ctBuffer));
memcpy(Cmd.ctBuffer, Config.cfgInitTail, sizeof(Config.cfgInitTail));
for (Cmd.ctCount = 0; Cmd.ctCount < sizeof(Cmd.ctBuffer); Cmd.ctCount++)
if (Cmd.ctBuffer[Cmd.ctCount] == '\r')
break;
/* if stepping CONFIG.SYS (F5/F8), tell COMMAND.COM about it */
/* 3 for string + 2 for "\r\n" */
if (Cmd.ctCount < sizeof(Cmd.ctBuffer) - 5)
{
char *insertString = NULL;
if (singleStep)
insertString = " /Y"; /* single step AUTOEXEC */
if (SkipAllConfig)
insertString = " /D"; /* disable AUTOEXEC */
if (insertString)
{
/* insert /D, /Y as first argument */
char *p, *q;
for (p = Cmd.ctBuffer; p < &Cmd.ctBuffer[Cmd.ctCount]; p++)
{
if (*p == ' ' || *p == '\t' || *p == '\r')
{
for (q = &Cmd.ctBuffer[Cmd.ctCount + 1]; q >= p; q--)
q[3] = q[0];
memcpy(p, insertString, 3);
break;
}
}
strcpy(Config.cfgInitTail, Cmd.ctBuffer); /* save buffer */
}
}
init_call_p_0(&Config); /* go execute process 0 (the shell) */
}
/* check for a block device and update device control block */
STATIC VOID update_dcb(struct dhdr FAR * dhp)
{
REG COUNT Index;
COUNT nunits = dhp->dh_name[0];
struct dpb FAR *dpb;
if (LoL->nblkdev == 0)
dpb = LoL->DPBp;
else
{
for (dpb = LoL->DPBp; (ULONG) dpb->dpb_next != 0xffffffffl;
dpb = dpb->dpb_next)
;
dpb = dpb->dpb_next =
KernelAlloc(nunits * sizeof(struct dpb), 'E', Config.cfgDosDataUmb);
}
for (Index = 0; Index < nunits; Index++)
{
dpb->dpb_next = dpb + 1;
dpb->dpb_unit = LoL->nblkdev;
dpb->dpb_subunit = Index;
dpb->dpb_device = dhp;
dpb->dpb_flags = M_CHANGED;
if ((LoL->CDSp != 0) && (LoL->nblkdev < LoL->lastdrive))
{
LoL->CDSp[LoL->nblkdev].cdsDpb = dpb;
LoL->CDSp[LoL->nblkdev].cdsFlags = CDSPHYSDRV;
}
++dpb;
++LoL->nblkdev;
}
(dpb - 1)->dpb_next = (void FAR *)0xFFFFFFFFl;
}
/* If cmdLine is NULL, this is an internal driver */
BOOL init_device(struct dhdr FAR * dhp, char *cmdLine, COUNT mode,
char FAR **r_top)
{
request rq;
char name[8];
if (cmdLine) {
char *p, *q, ch;
int i;
p = q = cmdLine;
for (;;)
{
ch = *p;
if (ch == '\0' || ch == ' ' || ch == '\t')
break;
p++;
if (ch == '\\' || ch == '/' || ch == ':')
q = p; /* remember position after path */
}
for (i = 0; i < 8; i++) {
ch = '\0';
if (p != q && *q != '.')
ch = *q++;
/* copy name, without extension */
name[i] = ch;
}
}
rq.r_unit = 0;
rq.r_status = 0;
rq.r_command = C_INIT;
rq.r_length = sizeof(request);
rq.r_endaddr = *r_top;
rq.r_bpbptr = (void FAR *)(cmdLine ? cmdLine : "\n");
rq.r_firstunit = LoL->nblkdev;
execrh((request FAR *) & rq, dhp);
/*
* Added needed Error handle
*/
if ((rq.r_status & (S_ERROR | S_DONE)) == S_ERROR)
return TRUE;
if (cmdLine)
{
/* Don't link in device drivers which do not take up memory */
if (rq.r_endaddr == (BYTE FAR *) dhp)
return TRUE;
/* Fix for multisegmented device drivers: */
/* If there are multiple device drivers in a single driver file, */
/* only the END ADDRESS returned by the last INIT call should be */
/* the used. It is recommended that all the device drivers in */
/* the file return the same address */
if (FP_OFF(dhp->dh_next) == 0xffff)
{
KernelAllocPara(FP_SEG(rq.r_endaddr) + (FP_OFF(rq.r_endaddr) + 15)/16
- FP_SEG(dhp), 'D', name, mode);
}
/* Another fix for multisegmented device drivers: */
/* To help emulate the functionallity experienced with other DOS */
/* operating systems when calling multiple device drivers in a */
/* single driver file, save the end address returned from the */
/* last INIT call which will then be passed as the end address */
/* for the next INIT call. */
*r_top = (char FAR *)rq.r_endaddr;
}
if (!(dhp->dh_attr & ATTR_CHAR) && (rq.r_nunits != 0))
{
dhp->dh_name[0] = rq.r_nunits;
update_dcb(dhp);
}
if (dhp->dh_attr & ATTR_CONIN)
LoL->syscon = dhp;
else if (dhp->dh_attr & ATTR_CLOCK)
LoL->clock = dhp;
return FALSE;
}
STATIC void InitIO(void)
{
struct dhdr far *device = &LoL->nul_dev;
/* Initialize driver chain */
setvec(0x29, int29_handler); /* Requires Fast Con Driver */
do {
init_device(device, NULL, 0, &lpTop);
device = device->dh_next;
}
while (FP_OFF(device) != 0xffff);
}
/* issue an internal error message */
VOID init_fatal(BYTE * err_msg)
{
printf("\nInternal kernel error - %s\nSystem halted\n", err_msg);
for (;;) ;
}
/*
Initialize all printers
this should work. IMHO, this might also be done on first use
of printer, as I never liked the noise by a resetting printer, and
I usually much more often reset my system, then I print :-)
*/
STATIC VOID InitPrinters(VOID)
{
iregs r;
int num_printers, i;
init_call_intr(0x11, &r); /* get equipment list */
num_printers = (r.a.x >> 14) & 3; /* bits 15-14 */
for (i = 0; i < num_printers; i++)
{
r.a.x = 0x0100; /* initialize printer */
r.d.x = i;
init_call_intr(0x17, &r);
}
}
STATIC VOID InitSerialPorts(VOID)
{
iregs r;
int serial_ports, i;
init_call_intr(0x11, &r); /* get equipment list */
serial_ports = (r.a.x >> 9) & 7; /* bits 11-9 */
for (i = 0; i < serial_ports; i++)
{
r.a.x = 0xA3; /* initialize serial port to 2400,n,8,1 */
r.d.x = i;
init_call_intr(0x14, &r);
}
}
/*****************************************************************
if kernel.config.BootHarddiskSeconds is set,
the default is to boot from harddisk, because
the user is assumed to just have forgotten to
remove the floppy/bootable CD from the drive.
user has some seconds to hit ANY key to continue
to boot from floppy/cd, else the system is
booted from HD
*/
EmulatedDriveStatus(int drive,char statusOnly)
{
iregs r;
char buffer[0x13];
buffer[0] = 0x13;
r.a.b.h = 0x4b; /* bootable CDROM - get status */
r.a.b.l = statusOnly;
r.d.b.l = (char)drive;
r.si = (int)buffer;
init_call_intr(0x13, &r);
if (r.flags & 1)
return FALSE;
return TRUE;
}
STATIC void CheckContinueBootFromHarddisk(void)
{
char *bootedFrom = "Floppy/CD";
iregs r;
int key;
if (InitKernelConfig.BootHarddiskSeconds == 0)
return;
if (LoL->BootDrive >= 3)
{
#if 0
if (!EmulatedDriveStatus(0x80,1))
#endif
{
/* already booted from HD */
return;
}
}
else {
#if 0
if (!EmulatedDriveStatus(0x00,1))
#endif
bootedFrom = "Floppy";
}
printf("\n"
"\n"
"\n"
" Hit any key within %d seconds to continue booot from %s\n"
" Hit 'H' or wait %d seconds to boot from Harddisk\n",
InitKernelConfig.BootHarddiskSeconds,
bootedFrom,
InitKernelConfig.BootHarddiskSeconds
);
key = GetBiosKey(InitKernelConfig.BootHarddiskSeconds);
if (key != -1 && (key & 0xff) != 'h' && (key & 0xff) != 'H')
{
/* user has hit a key, continue to boot from floppy/CD */
printf("\n");
return;
}
/* reboot from harddisk */
EmulatedDriveStatus(0x00,0);
EmulatedDriveStatus(0x80,0);
/* now jump and run */
r.a.x = 0x0201;
r.c.x = 0x0001;
r.d.x = 0x0080;
r.b.x = 0x7c00;
r.es = 0;
init_call_intr(0x13, &r);
{
void (far *reboot)(void) = (void (far*)(void)) MK_FP(0x0,0x7c00);
(*reboot)();
}
}
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