/****************************************************************/ /* */ /* 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 "portab.h" #include "init-mod.h" #include "dyndata.h" #include "init-dat.h" char copyright[] = "(C) Copyright 1995-2003 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"; /* These are the far variables from the DOS data segment that we need here. The init procedure uses a different default DS data segment, which is discarded after use. I hope to clean this up to use the DOS List of List and Swappable Data Area obtained via INT21. -- Bart */ extern UBYTE DOSFAR ASM nblkdev, DOSFAR ASM lastdrive; /* value of last drive */ GLOBAL BYTE DOSFAR os_major, /* major version number */ DOSFAR os_minor, /* minor version number */ DOSFAR ASM default_drive; /* default drive for dos */ GLOBAL UBYTE DOSFAR ASM BootDrive; /* Drive we came up from */ GLOBAL BYTE DOSFAR os_release[]; extern struct dpb FAR *DOSFAR ASM DPBp; /* First drive Parameter Block */ extern struct cds FAR *DOSFAR ASM CDSp; /* Current Directory Structure */ extern struct dhdr FAR *DOSFAR ASM clock, /* CLOCK$ device */ FAR * DOSFAR ASM syscon; /* console device */ extern struct dhdr ASM DOSTEXTFAR con_dev, /* console device drive */ DOSTEXTFAR ASM clk_dev, /* Clock device driver */ DOSTEXTFAR ASM blk_dev; /* Block device (Disk) driver */ extern iregs FAR *DOSFAR ASM user_r; /* User registers for int 21h call */ extern BYTE FAR ASM _HMATextEnd[]; extern struct _KernelConfig FAR ASM LowKernelConfig; #ifdef VERSION_STRINGS static BYTE *mainRcsId = "$Id$"; #endif struct _KernelConfig InitKernelConfig = { "", 0, 0, 0, 0, 0, 0, 0 }; extern WORD days[2][13]; extern BYTE FAR *lpOldTop; extern BYTE FAR *lpTop; extern BYTE ASM _ib_start[], ASM _ib_end[], ASM _init_end[]; extern UWORD ram_top; /* How much ram in Kbytes */ 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); void CheckContinueBootFromHarddisk(); extern void Init_clk_driver(void); #ifdef _MSC_VER BYTE _acrtused = 0; #endif #ifdef _MSC_VER __segment DosDataSeg = 0; /* serves for all references to the DOS DATA segment necessary for MSC+our funny linking model */ __segment DosTextSeg = 0; #endif /* little functions - could be ASM but does not really matter in this context */ void memset(void *s, int c, unsigned n) { char *t = s; while(n--) *t++ = c; } void fmemset(void far *s, int c, unsigned n) { char far *t = s; while(n--) *t++ = c; } void strcpy(char *dest, const char *src) { while(*src) *dest++ = *src++; *dest = '\0'; } void fmemcpy(void far *dest, const void far *src, unsigned n) { char far *d = dest; const char far *s = src; while(n--) *d++ = *s++; } void CheckContinueBootFromHarddisk(void); VOID ASMCFUNC FreeDOSmain(void) { #ifdef _MSC_VER extern FAR DATASTART; extern FAR prn_dev; DosDataSeg = (__segment) & DATASTART; DosTextSeg = (__segment) & prn_dev; #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(0x50,0xe0+2), sizeof(InitKernelConfig)); BootDrive = *(BYTE FAR *)MK_FP(0x50,0xe0) + 1; if (BootDrive >= 0x80) BootDrive = 3; /* C: */ *(DWORD FAR *)MK_FP(0x50,0xe0+2) = 0; } else { fmemcpy(&InitKernelConfig, &LowKernelConfig, sizeof(InitKernelConfig)); } 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' + 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' + nblkdev; drive++) { filename[0] = drive; if ((fileno = open(filename, O_RDONLY)) >= 0) close(fileno); } } STATIC void init_kernel(void) { COUNT i; os_major = MAJOR_RELEASE; 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); /* Fake int 21h stack frame */ user_r = (iregs FAR *) MK_FP(DOS_PSP, 0xD0); for (i = 0x20; i <= 0x3f; i++) setvec(i, empty_handler); /* Initialize IO subsystem */ InitIO(); InitPrinters(); /* 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); init_PSPSet(DOS_PSP); init_PSPInit(DOS_PSP); Init_clk_driver(); /* Do first initialization of system variable buffers so that */ /* we can read config.sys later. */ lastdrive = Config.cfgLastdrive; /* init_device((struct dhdr FAR *)&blk_dev, NULL, NULL, 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 < lastdrive; i++) close(i); /* and do final buffer allocation. */ PostConfig(); nblkdev = 0; update_dcb(&blk_dev); /* Init the file system one more time */ FsConfig(); configDone(); InitializeAllBPBs(); } STATIC VOID FsConfig(VOID) { REG COUNT i; struct dpb FAR *dpb; /* Log-in the default drive. */ /* Get the boot drive from the ipl and use it for default. */ default_drive = BootDrive - 1; dpb = DPBp; /* Initialize the current directory structures */ for (i = 0; i < lastdrive; i++) { struct cds FAR *pcds_table = &CDSp[i]; fmemcpy(pcds_table->cdsCurrentPath, "A:\\\0", 4); pcds_table->cdsCurrentPath[0] += i; if (i < 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; } /* 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", (void FAR *)os_release); printf("Kernel compatibility %d.%d", MAJOR_RELEASE, MINOR_RELEASE); #if defined(__TURBOC__) printf(" - TURBOC"); #elif defined(_MSC_VER) printf(" - MSC"); #elif defined(__WATCOMC__) printf(" - WATCOMC"); #elif defined(__GNUC__) printf(" - GNUC"); /* this is hypothetical only */ #else generate some bullshit error here, as the compiler should be known #endif #if defined (I386) printf(" - 80386 CPU required"); #elif defined (I186) printf(" - 80186 CPU required"); #endif #ifdef WITHFAT32 printf(" - FAT32 support"); #endif printf("\n\n%S", (void FAR *)copyright); } STATIC void kernel() { exec_blk exb; CommandTail Cmd; int rc; extern char MenuSelected; extern unsigned Menus; BYTE master_env[32]; char *masterenv_ptr = master_env; /* build the startup environment */ memset(master_env,0,sizeof(master_env)); /* initial path setting. is this useful ?? */ masterenv_ptr += sprintf(masterenv_ptr, "PATH=."); /* export the current selected config menu */ if (Menus) { masterenv_ptr += sprintf(masterenv_ptr, "CONFIG=%c", MenuSelected+'0'); } exb.exec.env_seg = DOS_PSP + 8; fmemcpy(MK_FP(exb.exec.env_seg, 0), master_env, sizeof(master_env)); /* process 0 */ /* Execute command.com /P from the drive we just booted from */ memset(Cmd.ctBuffer, 0, sizeof(Cmd.ctBuffer)); fmemcpy(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 */ if (Cmd.ctCount < sizeof(Cmd.ctBuffer) - 3) { extern int singleStep; extern int SkipAllConfig; 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]; fmemcpy(p, insertString, 3); Cmd.ctCount += 3; break; } } } } exb.exec.cmd_line = (CommandTail FAR *) & Cmd; exb.exec.fcb_1 = exb.exec.fcb_2 = (fcb FAR *) 0xfffffffful; #ifdef DEBUG printf("Process 0 starting: %s\n\n", Config.cfgInit); #endif while ((rc = init_DosExec(Config.cfgP_0_startmode, &exb, Config.cfgInit)) != SUCCESS) { BYTE *pLine; printf("\nBad or missing Command Interpreter: %d - %s\n", rc, Cmd.ctBuffer); printf ("\nPlease enter the correct location (for example C:\\COMMAND.COM):\n"); rc = read(STDIN, Cmd.ctBuffer, sizeof(Cmd.ctBuffer) - 1); Cmd.ctBuffer[rc] = '\0'; /* Get the string argument that represents the new init pgm */ pLine = GetStringArg(Cmd.ctBuffer, Config.cfgInit); /* Now take whatever tail is left and add it on as a single */ /* string. */ strcpy(Cmd.ctBuffer, pLine); /* and add a DOS new line just to be safe */ strcat(Cmd.ctBuffer, "\r\n"); Cmd.ctCount = rc - (pLine - Cmd.ctBuffer); #ifdef DEBUG printf("Process 0 starting: %s\n\n", Config.cfgInit); #endif } printf("\nSystem shutdown complete\nReboot now.\n"); for (;;) ; } /* 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 (nblkdev == 0) dpb = DPBp; else { for (dpb = 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 = nblkdev; dpb->dpb_subunit = Index; dpb->dpb_device = dhp; dpb->dpb_flags = M_CHANGED; if ((CDSp != 0) && (nblkdev < lastdrive)) { CDSp[nblkdev].cdsDpb = dpb; CDSp[nblkdev].cdsFlags = CDSPHYSDRV; } ++dpb; ++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; int i; char name[8]; char *p; fmemset(name, 0, 8); for (p = cmdLine; *p && *p != ' ' && *p != '\t'; p++); while (p >= cmdLine && *p != '\\' && *p != '/' && *p != ':') p--; p++; for (i = 0; i < 8 && p[i] && p[i] != '.'; i++) name[i] = p[i]; 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 = nblkdev; execrh((request FAR *) & rq, dhp); /* * Added needed Error handle */ if (rq.r_status & 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; KernelAllocPara(FP_SEG(rq.r_endaddr) + (FP_OFF(rq.r_endaddr) + 15)/16 - FP_SEG(dhp), 'D', name, mode); } 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) syscon = dhp; else if (dhp->dh_attr & ATTR_CLOCK) clock = dhp; return FALSE; } STATIC void InitIO(void) { /* Initialize driver chain */ setvec(0x29, int29_handler); /* Requires Fast Con Driver */ init_device(&con_dev, NULL, NULL, lpTop); init_device(&clk_dev, NULL, NULL, lpTop); } /* 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); } } /***************************************************************** 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 */ extern UWORD GetBiosKey(int timeout); EmulatedDriveStatus(int drive,char statusOnly) { iregs r; char buffer[13]; 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; } void CheckContinueBootFromHarddisk(void) { char *bootedFrom = "CD"; iregs r; if (InitKernelConfig.BootHarddiskSeconds == 0) return; if (BootDrive >= 3) { if (!EmulatedDriveStatus(0x80,1)) { /* already booted from HD */ return; } } else { if (!EmulatedDriveStatus(0x00,1)) bootedFrom = "Floppy"; } printf("\n" "\n" "\n" " Hit any key within %d seconds to continue booot from %s\n" " else continue to boot from Harddisk\n", InitKernelConfig.BootHarddiskSeconds, bootedFrom ); if (GetBiosKey(InitKernelConfig.BootHarddiskSeconds) != -1) { /* 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 (far*)()) MK_FP(0x0,0x7c00); (*reboot)(); } }