bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
EXE_Header head;Bitu i;
Bit16u fhandle;Bit16u len;Bit32u pos;
Bit16u pspseg,envseg,loadseg,memsize,readsize;
PhysPt loadaddress;RealPt relocpt;
Bitu headersize,imagesize;
DOS_ParamBlock block(block_pt);
block.LoadData();
if (flags!=LOADNGO && flags!=OVERLAY && flags!=LOAD) {
E_Exit("DOS:Not supported execute mode %d for file %s",flags,name);
}
/* Check for EXE or COM File */
bool iscom=false;
if (!DOS_OpenFile(name,OPEN_READ,&fhandle)) return false;
len=sizeof(EXE_Header);
if (!DOS_ReadFile(fhandle,(Bit8u *)&head,&len)) {
DOS_CloseFile(fhandle);
return false;
}
if (len<sizeof(EXE_Header)) {
if (len==0) {
/* Prevent executing zero byte files */
DOS_SetError(DOSERR_ACCESS_DENIED);
DOS_CloseFile(fhandle);
return false;
}
/* Otherwise must be a .com file */
iscom=true;
} else {
/* Convert the header to correct endian, i hope this works */
HostPt endian=(HostPt)&head;
for (i=0;i<sizeof(EXE_Header)/2;i++) {
*((Bit16u *)endian)=host_readw(endian);
endian+=2;
}
if ((head.signature!=MAGIC1) && (head.signature!=MAGIC2)) iscom=true;
else {
if(head.pages & ~0x07ff) /* 1 MB dos maximum address limit. Fixes TC3 IDE (kippesoep) */
LOG(LOG_EXEC,LOG_NORMAL)("Weird header: head.pages > 1 MB");
head.pages&=0x07ff;
headersize = head.headersize*16;
imagesize = head.pages*512-headersize;
if (imagesize+headersize<512) imagesize = 512-headersize;
}
}
Bit8u * loadbuf=(Bit8u *)new Bit8u[0x10000];
if (flags!=OVERLAY) {
/* Create an environment block */
envseg=block.exec.envseg;
if (!MakeEnv(name,&envseg)) {
DOS_CloseFile(fhandle);
return false;
}
/* Get Memory */
Bit16u minsize,maxsize;Bit16u maxfree=0xffff;DOS_AllocateMemory(&pspseg,&maxfree);
if (iscom) {
minsize=0x1000;maxsize=0xffff;
if (machine==MCH_PCJR) {
/* try to load file into memory below 96k */
pos=0;DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET);
Bit16u dataread=0x1800;
DOS_ReadFile(fhandle,loadbuf,&dataread);
if (dataread<0x1800) maxsize=dataread;
if (minsize>maxsize) minsize=maxsize;
}
} else { /* Exe size calculated from header */
minsize=long2para(imagesize+(head.minmemory<<4)+256);
if (head.maxmemory!=0) maxsize=long2para(imagesize+(head.maxmemory<<4)+256);
else maxsize=0xffff;
}
if (maxfree<minsize) {
DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
DOS_FreeMemory(envseg);
return false;
}
if (maxfree<maxsize) memsize=maxfree;
else memsize=maxsize;
if (!DOS_AllocateMemory(&pspseg,&memsize)) E_Exit("DOS:Exec error in memory");
if (iscom && (machine==MCH_PCJR) && (pspseg<0x2000)) {
maxsize=0xffff;
/* resize to full extent of memory block */
DOS_ResizeMemory(pspseg,&maxsize);
/* now try to lock out memory above segment 0x2000 */
if ((real_readb(0x2000,0)==0x5a) && (real_readw(0x2000,1)==0) && (real_readw(0x2000,3)==0x7ffe)) {
/* MCB after PCJr graphics memory region is still free */
if (pspseg+maxsize==0x17ff) {
DOS_MCB cmcb((Bit16u)(pspseg-1));
cmcb.SetType(0x5a); // last block
}
}
}
loadseg=pspseg+16;
if (!iscom) {
/* Check if requested to load program into upper part of allocated memory */
if ((head.minmemory == 0) && (head.maxmemory == 0))
loadseg = ((pspseg+memsize)*0x10-imagesize)/0x10;
}
} else loadseg=block.overlay.loadseg;
/* Load the executable */
loadaddress=PhysMake(loadseg,0);
if (iscom) { /* COM Load 64k - 256 bytes max */
pos=0;DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET);
readsize=0xffff-256;
DOS_ReadFile(fhandle,loadbuf,&readsize);
MEM_BlockWrite(loadaddress,loadbuf,readsize);
} else { /* EXE Load in 32kb blocks and then relocate */
pos=headersize;DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET);
while (imagesize>0x7FFF) {
readsize=0x8000;DOS_ReadFile(fhandle,loadbuf,&readsize);
MEM_BlockWrite(loadaddress,loadbuf,readsize);
// if (readsize!=0x8000) LOG(LOG_EXEC,LOG_NORMAL)("Illegal header");
loadaddress+=0x8000;imagesize-=0x8000;
}
if (imagesize>0) {
readsize=(Bit16u)imagesize;DOS_ReadFile(fhandle,loadbuf,&readsize);
MEM_BlockWrite(loadaddress,loadbuf,readsize);
// if (readsize!=imagesize) LOG(LOG_EXEC,LOG_NORMAL)("Illegal header");
}
/* Relocate the exe image */
Bit16u relocate;
if (flags==OVERLAY) relocate=block.overlay.relocation;
else relocate=loadseg;
pos=head.reloctable;DOS_SeekFile(fhandle,&pos,0);
for (i=0;i<head.relocations;i++) {
readsize=4;DOS_ReadFile(fhandle,(Bit8u *)&relocpt,&readsize);
relocpt=host_readd((HostPt)&relocpt); //Endianize
PhysPt address=PhysMake(RealSeg(relocpt)+loadseg,RealOff(relocpt));
mem_writew(address,mem_readw(address)+relocate);
}
}
delete[] loadbuf;
DOS_CloseFile(fhandle);
/* Setup a psp */
if (flags!=OVERLAY) {
// Create psp after closing exe, to avoid dead file handle of exe in copied psp
SetupPSP(pspseg,memsize,envseg);
SetupCMDLine(pspseg,block);
};
CALLBACK_SCF(false); /* Carry flag cleared for caller if successfull */
if (flags==OVERLAY) return true; /* Everything done for overlays */
RealPt csip,sssp;
if (iscom) {
csip=RealMake(pspseg,0x100);
sssp=RealMake(pspseg,0xfffe);
mem_writew(PhysMake(pspseg,0xfffe),0);
} else {
csip=RealMake(loadseg+head.initCS,head.initIP);
sssp=RealMake(loadseg+head.initSS,head.initSP);
}
if (flags==LOAD) {
DOS_PSP callpsp(dos.psp());
/* Save the SS:SP on the PSP of calling program */
callpsp.SetStack(RealMakeSeg(ss,reg_sp));
/* Switch the psp's */
dos.psp(pspseg);
DOS_PSP newpsp(dos.psp());
dos.dta(RealMake(newpsp.GetSegment(),0x80));
block.exec.initsssp = sssp;
block.exec.initcsip = csip;
block.SaveData();
return true;
}
if (flags==LOADNGO) {
/* Get Caller's program CS:IP of the stack and set termination address to that */
RealSetVec(0x22,RealMake(mem_readw(SegPhys(ss)+reg_sp+2),mem_readw(SegPhys(ss)+reg_sp)));
SaveRegisters();
DOS_PSP callpsp(dos.psp());
/* Save the SS:SP on the PSP of calling program */
callpsp.SetStack(RealMakeSeg(ss,reg_sp));
/* Switch the psp's and set new DTA */
dos.psp(pspseg);
DOS_PSP newpsp(dos.psp());
dos.dta(RealMake(newpsp.GetSegment(),0x80));
/* save vectors */
newpsp.SaveVectors();
/* copy fcbs */
newpsp.SetFCB1(block.exec.fcb1);
newpsp.SetFCB2(block.exec.fcb2);
/* Set the stack for new program */
SegSet16(ss,RealSeg(sssp));reg_sp=RealOff(sssp);
/* Add some flags and CS:IP on the stack for the IRET */
reg_sp-=6;
mem_writew(SegPhys(ss)+reg_sp+0,RealOff(csip));
mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(csip));
/* DOS starts programs with a RETF, so our IRET
should not modify critical flags (IOPL in v86 mode);
interrupt flag is set explicitly, test flags cleared */
mem_writew(SegPhys(ss)+reg_sp+4,(reg_flags&(~FMASK_TEST))|FLAG_IF);
/* Setup the rest of the registers */
reg_ax=reg_bx=0;reg_cx=0xff;
reg_dx=pspseg;
reg_si=RealOff(csip);
reg_di=RealOff(sssp);
reg_bp=0x91c; /* DOS internal stack begin relict */
SegSet16(ds,pspseg);SegSet16(es,pspseg);
#if C_DEBUG
/* Started from debug.com, then set breakpoint at start */
DEBUG_CheckExecuteBreakpoint(RealSeg(csip),RealOff(csip));
#endif
/* Add the filename to PSP and environment MCB's */
char stripname[8];Bitu index=0;
while (char chr=*name++) {
switch (chr) {
case ':':case '\\':case '/':index=0;break;
default:if (index<8) stripname[index++]=toupper(chr);
}
}
index=0;
while (index<8) {
if (stripname[index]=='.') break;
if (!stripname[index]) break;
index++;
}
memset(&stripname[index],0,8-index);
DOS_MCB pspmcb(dos.psp()-1);
pspmcb.SetFileName(stripname);
DOS_UpdatePSPName();
return true;
}
return false;
}
void SHELL_Init() {
/* Add messages */
MSG_Add("SHELL_ILLEGAL_PATH","Illegal Path.\n");
MSG_Add("SHELL_CMD_HELP","If you want a list of all supported commands type \033[33;1mhelp /all\033[0m .\nA short list of the most often used commands:\n");
MSG_Add("SHELL_CMD_ECHO_ON","ECHO is on.\n");
MSG_Add("SHELL_CMD_ECHO_OFF","ECHO is off.\n");
MSG_Add("SHELL_ILLEGAL_SWITCH","Illegal switch: %s.\n");
MSG_Add("SHELL_MISSING_PARAMETER","Required parameter missing.\n");
MSG_Add("SHELL_CMD_CHDIR_ERROR","Unable to change to: %s.\n");
MSG_Add("SHELL_CMD_CHDIR_HINT","To change to different drive type \033[31m%c:\033[0m\n");
MSG_Add("SHELL_CMD_CHDIR_HINT_2","directoryname is longer than 8 characters and/or contains spaces.\nTry \033[31mcd %s\033[0m\n");
MSG_Add("SHELL_CMD_CHDIR_HINT_3","You are still on drive Z:, change to a mounted drive with \033[31mC:\033[0m.\n");
MSG_Add("SHELL_CMD_MKDIR_ERROR","Unable to make: %s.\n");
MSG_Add("SHELL_CMD_RMDIR_ERROR","Unable to remove: %s.\n");
MSG_Add("SHELL_CMD_DEL_ERROR","Unable to delete: %s.\n");
MSG_Add("SHELL_SYNTAXERROR","The syntax of the command is incorrect.\n");
MSG_Add("SHELL_CMD_SET_NOT_SET","Environment variable %s not defined.\n");
MSG_Add("SHELL_CMD_SET_OUT_OF_SPACE","Not enough environment space left.\n");
MSG_Add("SHELL_CMD_IF_EXIST_MISSING_FILENAME","IF EXIST: Missing filename.\n");
MSG_Add("SHELL_CMD_IF_ERRORLEVEL_MISSING_NUMBER","IF ERRORLEVEL: Missing number.\n");
MSG_Add("SHELL_CMD_IF_ERRORLEVEL_INVALID_NUMBER","IF ERRORLEVEL: Invalid number.\n");
MSG_Add("SHELL_CMD_GOTO_MISSING_LABEL","No label supplied to GOTO command.\n");
MSG_Add("SHELL_CMD_GOTO_LABEL_NOT_FOUND","GOTO: Label %s not found.\n");
MSG_Add("SHELL_CMD_FILE_NOT_FOUND","File %s not found.\n");
MSG_Add("SHELL_CMD_FILE_EXISTS","File %s already exists.\n");
MSG_Add("SHELL_CMD_DIR_INTRO","Directory of %s.\n");
MSG_Add("SHELL_CMD_DIR_BYTES_USED","%5d File(s) %17s Bytes.\n");
MSG_Add("SHELL_CMD_DIR_BYTES_FREE","%5d Dir(s) %17s Bytes free.\n");
MSG_Add("SHELL_EXECUTE_DRIVE_NOT_FOUND","Drive %c does not exist!\nYou must \033[31mmount\033[0m it first. Type \033[1;33mintro\033[0m or \033[1;33mintro mount\033[0m for more information.\n");
MSG_Add("SHELL_EXECUTE_ILLEGAL_COMMAND","Illegal command: %s.\n");
MSG_Add("SHELL_CMD_PAUSE","Press any key to continue.\n");
MSG_Add("SHELL_CMD_PAUSE_HELP","Waits for 1 keystroke to continue.\n");
MSG_Add("SHELL_CMD_COPY_FAILURE","Copy failure : %s.\n");
MSG_Add("SHELL_CMD_COPY_SUCCESS"," %d File(s) copied.\n");
MSG_Add("SHELL_CMD_SUBST_NO_REMOVE","Removing drive not supported. Doing nothing.\n");
MSG_Add("SHELL_CMD_SUBST_FAILURE","SUBST failed. You either made an error in your commandline or the target drive is already used.\nIt's only possible to use SUBST on Local drives");
MSG_Add("SHELL_STARTUP_BEGIN",
"\033[44;1m\xC9\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xBB\n"
"\xBA \033[32mWelcome to DOSBox v%-8s\033[37m \xBA\n"
"\xBA \xBA\n"
// "\xBA DOSBox runs real and protected mode games. \xBA\n"
"\xBA For a short introduction for new users type: \033[33mINTRO\033[37m \xBA\n"
"\xBA For supported shell commands type: \033[33mHELP\033[37m \xBA\n"
"\xBA \xBA\n"
"\xBA To adjust the emulated CPU speed, use \033[31mctrl-F11\033[37m and \033[31mctrl-F12\033[37m. \xBA\n"
"\xBA To activate the keymapper \033[31mctrl-F1\033[37m. \xBA\n"
"\xBA For more information read the \033[36mREADME\033[37m file in the DOSBox directory. \xBA\n"
"\xBA \xBA\n"
);
MSG_Add("SHELL_STARTUP_CGA","\xBA DOSBox supports Composite CGA mode. \xBA\n"
"\xBA Use \033[31m(alt-)F11\033[37m to change the colours when in this mode. \xBA\n"
"\xBA \xBA\n"
);
MSG_Add("SHELL_STARTUP_HERC","\xBA Use \033[31mF11\033[37m to cycle through white, amber, and green monochrome color. \xBA\n"
"\xBA \xBA\n"
);
MSG_Add("SHELL_STARTUP_DEBUG",
"\xBA Press \033[31malt-Pause\033[37m to enter the debugger or start the exe with \033[33mDEBUG\033[37m. \xBA\n"
"\xBA \xBA\n"
);
MSG_Add("SHELL_STARTUP_END",
"\xBA \033[32mHAVE FUN!\033[37m \xBA\n"
"\xBA \033[32mThe DOSBox Team \033[33mhttp://www.dosbox.com\033[37m \xBA\n"
"\xC8\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
"\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xBC\033[0m\n"
//"\n" //Breaks the startup message if you type a mount and a drive change.
);
MSG_Add("SHELL_CMD_CHDIR_HELP","Displays/changes the current directory.\n");
MSG_Add("SHELL_CMD_CHDIR_HELP_LONG","CHDIR [drive:][path]\n"
"CHDIR [..]\n"
"CD [drive:][path]\n"
"CD [..]\n\n"
" .. Specifies that you want to change to the parent directory.\n\n"
"Type CD drive: to display the current directory in the specified drive.\n"
"Type CD without parameters to display the current drive and directory.\n");
MSG_Add("SHELL_CMD_CLS_HELP","Clear screen.\n");
MSG_Add("SHELL_CMD_DIR_HELP","Directory View.\n");
MSG_Add("SHELL_CMD_ECHO_HELP","Display messages and enable/disable command echoing.\n");
MSG_Add("SHELL_CMD_EXIT_HELP","Exit from the shell.\n");
MSG_Add("SHELL_CMD_HELP_HELP","Show help.\n");
MSG_Add("SHELL_CMD_MKDIR_HELP","Make Directory.\n");
MSG_Add("SHELL_CMD_MKDIR_HELP_LONG","MKDIR [drive:][path]\n"
"MD [drive:][path]\n");
MSG_Add("SHELL_CMD_RMDIR_HELP","Remove Directory.\n");
MSG_Add("SHELL_CMD_RMDIR_HELP_LONG","RMDIR [drive:][path]\n"
"RD [drive:][path]\n");
MSG_Add("SHELL_CMD_SET_HELP","Change environment variables.\n");
MSG_Add("SHELL_CMD_IF_HELP","Performs conditional processing in batch programs.\n");
MSG_Add("SHELL_CMD_GOTO_HELP","Jump to a labeled line in a batch script.\n");
MSG_Add("SHELL_CMD_SHIFT_HELP","Leftshift commandline parameters in a batch script.\n");
MSG_Add("SHELL_CMD_TYPE_HELP","Display the contents of a text-file.\n");
MSG_Add("SHELL_CMD_TYPE_HELP_LONG","TYPE [drive:][path][filename]\n");
MSG_Add("SHELL_CMD_REM_HELP","Add comments in a batch file.\n");
MSG_Add("SHELL_CMD_REM_HELP_LONG","REM [comment]\n");
MSG_Add("SHELL_CMD_NO_WILD","This is a simple version of the command, no wildcards allowed!\n");
MSG_Add("SHELL_CMD_RENAME_HELP","Renames one or more files.\n");
MSG_Add("SHELL_CMD_RENAME_HELP_LONG","RENAME [drive:][path]filename1 filename2.\n"
"REN [drive:][path]filename1 filename2.\n\n"
"Note that you can not specify a new drive or path for your destination file.\n");
MSG_Add("SHELL_CMD_DELETE_HELP","Removes one or more files.\n");
MSG_Add("SHELL_CMD_COPY_HELP","Copy files.\n");
MSG_Add("SHELL_CMD_CALL_HELP","Start a batch file from within another batch file.\n");
MSG_Add("SHELL_CMD_SUBST_HELP","Assign an internal directory to a drive.\n");
MSG_Add("SHELL_CMD_LOADHIGH_HELP","Loads a program into upper memory (requires xms=true,umb=true).\n");
MSG_Add("SHELL_CMD_CHOICE_HELP","Waits for a keypress and sets ERRORLEVEL.\n");
MSG_Add("SHELL_CMD_CHOICE_HELP_LONG","CHOICE [/C:choices] [/N] [/S] text\n"
" /C[:]choices - Specifies allowable keys. Default is: yn.\n"
" /N - Do not display the choices at end of prompt.\n"
" /S - Enables case-sensitive choices to be selected.\n"
" text - The text to display as a prompt.\n");
MSG_Add("SHELL_CMD_ATTRIB_HELP","Does nothing. Provided for compatibility.\n");
MSG_Add("SHELL_CMD_PATH_HELP","Provided for compatibility.\n");
MSG_Add("SHELL_CMD_VER_HELP","View and set the reported DOS version.\n");
MSG_Add("SHELL_CMD_VER_VER","DOSBox version %s. Reported DOS version %d.%02d.\n");
#ifdef IPHONEOS
MSG_Add("SHELL_CMD_UNZIP_HELP","Extract zip file to current directory.\n");
#endif
/* Regular startup */
call_shellstop=CALLBACK_Allocate();
/* Setup the startup CS:IP to kill the last running machine when exitted */
RealPt newcsip=CALLBACK_RealPointer(call_shellstop);
SegSet16(cs,RealSeg(newcsip));
reg_ip=RealOff(newcsip);
CALLBACK_Setup(call_shellstop,shellstop_handler,CB_IRET,"shell stop");
PROGRAMS_MakeFile("COMMAND.COM",SHELL_ProgramStart);
/* Now call up the shell for the first time */
Bit16u psp_seg=DOS_FIRST_SHELL;
Bit16u env_seg=DOS_FIRST_SHELL+19; //DOS_GetMemory(1+(4096/16))+1;
Bit16u stack_seg=DOS_GetMemory(2048/16);
SegSet16(ss,stack_seg);
reg_sp=2046;
/* Set up int 24 and psp (Telarium games) */
real_writeb(psp_seg+16+1,0,0xea); /* far jmp */
real_writed(psp_seg+16+1,1,real_readd(0,0x24*4));
real_writed(0,0x24*4,((Bit32u)psp_seg<<16) | ((16+1)<<4));
/* Set up int 23 to "int 20" in the psp. Fixes what.exe */
real_writed(0,0x23*4,((Bit32u)psp_seg<<16));
/* Setup MCBs */
DOS_MCB pspmcb((Bit16u)(psp_seg-1));
pspmcb.SetPSPSeg(psp_seg); // MCB of the command shell psp
pspmcb.SetSize(0x10+2);
pspmcb.SetType(0x4d);
DOS_MCB envmcb((Bit16u)(env_seg-1));
envmcb.SetPSPSeg(psp_seg); // MCB of the command shell environment
envmcb.SetSize(DOS_MEM_START-env_seg);
envmcb.SetType(0x4d);
/* Setup environment */
PhysPt env_write=PhysMake(env_seg,0);
MEM_BlockWrite(env_write,path_string,(Bitu)(strlen(path_string)+1));
env_write += (PhysPt)(strlen(path_string)+1);
MEM_BlockWrite(env_write,comspec_string,(Bitu)(strlen(comspec_string)+1));
env_write += (PhysPt)(strlen(comspec_string)+1);
mem_writeb(env_write++,0);
mem_writew(env_write,1);
env_write+=2;
MEM_BlockWrite(env_write,full_name,(Bitu)(strlen(full_name)+1));
DOS_PSP psp(psp_seg);
psp.MakeNew(0);
dos.psp(psp_seg);
/* The start of the filetable in the psp must look like this:
* 01 01 01 00 02
* In order to achieve this: First open 2 files. Close the first and
* duplicate the second (so the entries get 01) */
Bit16u dummy=0;
DOS_OpenFile("CON",OPEN_READWRITE,&dummy); /* STDIN */
DOS_OpenFile("CON",OPEN_READWRITE,&dummy); /* STDOUT */
DOS_CloseFile(0); /* Close STDIN */
DOS_ForceDuplicateEntry(1,0); /* "new" STDIN */
DOS_ForceDuplicateEntry(1,2); /* STDERR */
DOS_OpenFile("CON",OPEN_READWRITE,&dummy); /* STDAUX */
DOS_OpenFile("CON",OPEN_READWRITE,&dummy); /* STDPRN */
psp.SetParent(psp_seg);
/* Set the environment */
psp.SetEnvironment(env_seg);
/* Set the command line for the shell start up */
CommandTail tail;
tail.count=(Bit8u)strlen(init_line);
strcpy(tail.buffer,init_line);
MEM_BlockWrite(PhysMake(psp_seg,128),&tail,128);
/* Setup internal DOS Variables */
dos.dta(RealMake(psp_seg,0x80));
dos.psp(psp_seg);
SHELL_ProgramStart(&first_shell);
first_shell->Run();
delete first_shell;
first_shell = 0;//Make clear that it shouldn't be used anymore
}
