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dosbox-x/src/dos/dos_misc.cpp

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/*
* Copyright (C) 2002-2019 The DOSBox Team
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA.
*/
#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "regs.h"
#include "dos_inc.h"
#include <list>
Bit32u DOS_HMA_LIMIT();
Bit32u DOS_HMA_FREE_START();
Bit32u DOS_HMA_GET_FREE_SPACE();
void DOS_HMA_CLAIMED(Bit16u bytes);
bool ANSI_SYS_installed();
extern bool enable_share_exe_fake;
extern Bitu XMS_EnableA20(bool enable);
bool enable_a20_on_windows_init = false;
static Bitu call_int2f,call_int2a;
static std::list<MultiplexHandler*> Multiplex;
typedef std::list<MultiplexHandler*>::iterator Multiplex_it;
const char *Win_NameThatVXD(Bit16u devid) {
switch (devid) {
case 0x0006: return "V86MMGR";
case 0x000C: return "VMD";
case 0x000D: return "VKD";
case 0x0010: return "BLOCKDEV";
case 0x0014: return "VNETBIOS";
case 0x0015: return "DOSMGR";
case 0x0018: return "VMPOLL";
case 0x0021: return "PAGEFILE";
case 0x002D: return "W32S";
case 0x0040: return "IFSMGR";
case 0x0446: return "VADLIBD";
case 0x0484: return "IFSMGR";
case 0x0487: return "NWSUP";
case 0x28A1: return "PHARLAP";
case 0x7A5F: return "SIWVID";
}
return NULL;
}
void DOS_AddMultiplexHandler(MultiplexHandler * handler) {
Multiplex.push_front(handler);
}
void DOS_DelMultiplexHandler(MultiplexHandler * handler) {
for(Multiplex_it it =Multiplex.begin();it != Multiplex.end();++it) {
if(*it == handler) {
Multiplex.erase(it);
return;
}
}
}
static Bitu INT2F_Handler(void) {
for(Multiplex_it it = Multiplex.begin();it != Multiplex.end();++it)
if( (*it)() ) return CBRET_NONE;
LOG(LOG_DOSMISC,LOG_ERROR)("DOS:INT 2F Unhandled call AX=%4X",reg_ax);
return CBRET_NONE;
}
static Bitu INT2A_Handler(void) {
return CBRET_NONE;
}
extern RealPt DOS_DriveDataListHead; // INT 2Fh AX=0803h DRIVER.SYS drive data table list
// INT 2F
static bool DOS_MultiplexFunctions(void) {
char name[256];
switch (reg_ax) {
case 0x0800: /* DRIVER.SYS function */
case 0x0801: /* DRIVER.SYS function */
case 0x0802: /* DRIVER.SYS function */
LOG(LOG_MISC,LOG_DEBUG)("Unhandled DRIVER.SYS call AX=%04x BX=%04x CX=%04x DX=%04x BP=%04x",reg_ax,reg_bx,reg_cx,reg_dx,reg_bp);
break;
case 0x0803: /* DRIVER.SYS function */
LOG(LOG_MISC,LOG_DEBUG)("Unhandled DRIVER.SYS call AX=%04x BX=%04x CX=%04x DX=%04x BP=%04x",reg_ax,reg_bx,reg_cx,reg_dx,reg_bp);
// FIXME: Windows 95 SCANDISK.EXE relies on the drive data table list pointer provided by this call.
// Returning DS:DI unmodified or set to 0:0 will only send it off into the weeds chasing random data
// as a linked list. However looking at the code DI=0xFFFF is sufficient to prevent that until
// DOSBox-X emulates DRIVER.SYS functions and provides the information it expects according to RBIL.
// BUT, Windows 95 setup checks if the pointer is NULL, and considers 0:FFFF valid >_<.
// It's just easier to return a pointer to a dummy table.
// [http://www.ctyme.com/intr/rb-4283.htm]
SegSet16(ds,DOS_DriveDataListHead >> 16);
reg_di = DOS_DriveDataListHead;
break;
/* ert, 20100711: Locking extensions */
case 0x1000: /* SHARE.EXE installation check */
if (enable_share_exe_fake) {
reg_al = 0xff; /* Pretend that share.exe is installed.. Of course it's a bloody LIE! */
}
return true;
case 0x1216: /* GET ADDRESS OF SYSTEM FILE TABLE ENTRY */
// reg_bx is a system file table entry, should coincide with
// the file handle so just use that
LOG(LOG_DOSMISC,LOG_ERROR)("Some BAD filetable call used bx=%X",reg_bx);
if(reg_bx <= DOS_FILES) CALLBACK_SCF(false);
else CALLBACK_SCF(true);
if (reg_bx<16) {
RealPt sftrealpt=mem_readd(Real2Phys(dos_infoblock.GetPointer())+4);
PhysPt sftptr=Real2Phys(sftrealpt);
Bit32u sftofs=0x06u+reg_bx*0x3bu;
if (Files[reg_bx]) mem_writeb(sftptr+sftofs, (Bit8u)(Files[reg_bx]->refCtr));
else mem_writeb(sftptr+sftofs,0);
if (!Files[reg_bx]) return true;
Bit32u handle=RealHandle(reg_bx);
if (handle>=DOS_FILES) {
mem_writew(sftptr+sftofs+0x02,0x02); // file open mode
mem_writeb(sftptr+sftofs+0x04,0x00); // file attribute
mem_writew(sftptr+sftofs+0x05,Files[reg_bx]->GetInformation()); // device info word
mem_writed(sftptr+sftofs+0x07,0); // device driver header
mem_writew(sftptr+sftofs+0x0d,0); // packed time
mem_writew(sftptr+sftofs+0x0f,0); // packed date
mem_writew(sftptr+sftofs+0x11,0); // size
mem_writew(sftptr+sftofs+0x15,0); // current position
} else {
Bit8u drive=Files[reg_bx]->GetDrive();
mem_writew(sftptr+sftofs+0x02,(Bit16u)(Files[reg_bx]->flags&3)); // file open mode
mem_writeb(sftptr+sftofs+0x04,(Bit8u)(Files[reg_bx]->attr)); // file attribute
mem_writew(sftptr+sftofs+0x05,0x40|drive); // device info word
mem_writed(sftptr+sftofs+0x07,RealMake(dos.tables.dpb,drive*dos.tables.dpb_size)); // dpb of the drive
mem_writew(sftptr+sftofs+0x0d,Files[reg_bx]->time); // packed file time
mem_writew(sftptr+sftofs+0x0f,Files[reg_bx]->date); // packed file date
Bit32u curpos=0;
Files[reg_bx]->Seek(&curpos,DOS_SEEK_CUR);
Bit32u endpos=0;
Files[reg_bx]->Seek(&endpos,DOS_SEEK_END);
mem_writed(sftptr+sftofs+0x11,endpos); // size
mem_writed(sftptr+sftofs+0x15,curpos); // current position
Files[reg_bx]->Seek(&curpos,DOS_SEEK_SET);
}
// fill in filename in fcb style
// (space-padded name (8 chars)+space-padded extension (3 chars))
const char* filename=(const char*)Files[reg_bx]->GetName();
if (strrchr(filename,'\\')) filename=strrchr(filename,'\\')+1;
if (strrchr(filename,'/')) filename=strrchr(filename,'/')+1;
if (!filename) return true;
const char* dotpos=strrchr(filename,'.');
if (dotpos) {
dotpos++;
size_t nlen=strlen(filename);
size_t extlen=strlen(dotpos);
Bits nmelen=(Bits)nlen-(Bits)extlen;
if (nmelen<1) return true;
nlen-=(extlen+1);
if (nlen>8) nlen=8;
size_t i;
for (i=0; i<nlen; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20u+i),(unsigned char)filename[i]);
for (i=nlen; i<8; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20u+i),(unsigned char)' ');
if (extlen>3) extlen=3;
for (i=0; i<extlen; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x28u+i),(unsigned char)dotpos[i]);
for (i=extlen; i<3; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x28u+i),(unsigned char)' ');
} else {
size_t i;
size_t nlen=strlen(filename);
if (nlen>8) nlen=8;
for (i=0; i<nlen; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20u+i),(unsigned char)filename[i]);
for (i=nlen; i<11; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20u+i),(unsigned char)' ');
}
SegSet16(es,RealSeg(sftrealpt));
reg_di=RealOff(sftrealpt+sftofs);
reg_ax=0xc000;
}
return true;
case 0x1300:
case 0x1302:
reg_ax=0;
return true;
case 0x1612:
reg_ax=0;
name[0]=1;
name[1]=0;
MEM_BlockWrite(SegPhys(es)+reg_bx,name,0x20);
return true;
case 0x1613: /* Get SYSTEM.DAT path */
strcpy(name,"C:\\WINDOWS\\SYSTEM.DAT");
MEM_BlockWrite(SegPhys(es)+reg_di,name,(Bitu)(strlen(name)+1));
reg_ax=0;
reg_cx=strlen(name);
return true;
case 0x1600: /* Windows enhanced mode installation check */
// Leave AX as 0x1600, indicating that neither Windows 3.x enhanced mode, Windows/386 2.x
// nor Windows 95 are running, nor is XMS version 1 driver installed
return true;
case 0x1605: /* Windows init broadcast */
if (enable_a20_on_windows_init) {
/* This hack exists because Windows 3.1 doesn't seem to enable A20 first during an
* initial critical period where it assumes it's on, prior to checking and enabling/disabling it.
*
* Note that Windows 3.1 also makes this mistake in Standard/286 mode, but it doesn't even
* make this callout, so this hack is useless unless you are using Enhanced/386 mode.
* If you want to run Windows 3.1 Standard mode with a20=mask you will have to run builtin
* command "a20gate on" to turn on the A20 gate prior to starting Windows. */
LOG_MSG("Enabling A20 gate for Windows in response to INIT broadcast");
XMS_EnableA20(true);
}
/* TODO: Maybe future parts of DOSBox-X will do something with this */
/* TODO: Don't show this by default. Show if the user wants it by a) setting something to "true" in dosbox.conf or b) running a builtin command in Z:\ */
LOG_MSG("DEBUG: INT 2Fh Windows 286/386 DOSX init broadcast issued (ES:BX=%04x:%04x DS:SI=%04x:%04x CX=%04x DX=%04x DI=%04x(aka version %u.%u))",
SegValue(es),reg_bx,
SegValue(ds),reg_si,
reg_cx,reg_dx,reg_di,
reg_di>>8,reg_di&0xFF);
if (reg_dx & 0x0001)
LOG_MSG(" [286 DOS extender]");
else
LOG_MSG(" [Enhanced mode]");
LOG_MSG("\n");
/* NTS: The way this protocol works, is that when you (the program hooking this call) receive it,
* you first pass the call down to the previous INT 2Fh handler with registers unmodified,
* and then when the call unwinds back up the chain, THEN you modify the results to notify
* yourself to Windows. So logically, since we're the DOS kernel at the end of the chain,
* we should still see ES:BX=0000:0000 and DS:SI=0000:0000 and CX=0000 unmodified from the
* way the Windows kernel issued the call. If that's not the case, then we need to issue
* a warning because some bastard on the call chain is ruining it for all of us. */
if (SegValue(es) != 0 || reg_bx != 0 || SegValue(ds) != 0 || reg_si != 0 || reg_cx != 0) {
LOG_MSG("WARNING: Some registers at this point (the top of the call chain) are nonzero.\n");
LOG_MSG(" That means a TSR or other entity has modified registers on the way down\n");
LOG_MSG(" the call chain. The Windows init broadcast is supposed to be handled\n");
LOG_MSG(" going down the chain by calling the previous INT 2Fh handler with registers\n");
LOG_MSG(" unmodified, and only modify registers on the way back up the chain!\n");
}
return false; /* pass it on to other INT 2F handlers */
case 0x1606: /* Windows exit broadcast */
/* TODO: Maybe future parts of DOSBox-X will do something with this */
/* TODO: Don't show this by default. Show if the user wants it by a) setting something to "true" in dosbox.conf or b) running a builtin command in Z:\ */
LOG_MSG("DEBUG: INT 2Fh Windows 286/386 DOSX exit broadcast issued (DX=0x%04x)",reg_dx);
if (reg_dx & 0x0001)
LOG_MSG(" [286 DOS extender]");
else
LOG_MSG(" [Enhanced mode]");
LOG_MSG("\n");
return false; /* pass it on to other INT 2F handlers */
case 0x1607:
/* TODO: Don't show this by default. Show if the user wants it by a) setting something to "true" in dosbox.conf or b) running a builtin command in Z:\
* Additionally, if the user WANTS to see every invocation of the IDLE call, then allow them to enable that too */
if (reg_bx != 0x18) { /* don't show the idle call. it's used too often */
const char *str = Win_NameThatVXD(reg_bx);
if (str == NULL) str = "??";
LOG_MSG("DEBUG: INT 2Fh Windows virtual device '%s' callout (BX(deviceID)=0x%04x CX(function)=0x%04x)\n",
str,reg_bx,reg_cx);
}
if (reg_bx == 0x15) { /* DOSMGR */
switch (reg_cx) {
case 0x0000: // query instance
reg_cx = 0x0001;
reg_dx = 0x50; // dos driver segment
SegSet16(es,0x50); // patch table seg
reg_bx = 0x60; // patch table ofs
return true;
case 0x0001: // set patches
reg_ax = 0xb97c;
reg_bx = (reg_dx & 0x16);
reg_dx = 0xa2ab;
return true;
case 0x0003: // get size of data struc
if (reg_dx==0x0001) {
// CDS size requested
reg_ax = 0xb97c;
reg_dx = 0xa2ab;
reg_cx = 0x000e; // size
}
return true;
case 0x0004: // instanced data
reg_dx = 0; // none
return true;
case 0x0005: // get device driver size
reg_ax = 0;
reg_dx = 0;
return true;
default:
return false;
}
}
else if (reg_bx == 0x18) { /* VMPoll (idle) */
return true;
}
else return false;
case 0x1680: /* RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE */
//TODO Maybe do some idling but could screw up other systems :)
return true; //So no warning in the debugger anymore
case 0x1689: /* Kernel IDLE CALL */
case 0x168f: /* Close awareness crap */
/* Removing warning */
return true;
#ifdef WIN32
case 0x1700:
reg_al = 1;
reg_ah = 1;
return true;
case 0x1701:
reg_ax=OpenClipboard(NULL)?1:0;
return true;
case 0x1702:
reg_ax=0;
if (OpenClipboard(NULL))
{
reg_ax=EmptyClipboard()?1:0;
CloseClipboard();
}
return true;
case 0x1703:
reg_ax=0;
if ((reg_dx==1||reg_dx==7)&&OpenClipboard(NULL))
{
char *text, *buffer;
text = new char[reg_cx];
MEM_StrCopy(SegPhys(es)+reg_bx,text,reg_cx);
*(text+reg_cx-1)=0;
HGLOBAL clipbuffer;
EmptyClipboard();
clipbuffer = GlobalAlloc(GMEM_DDESHARE, strlen(text)+1);
buffer = (char*)GlobalLock(clipbuffer);
strcpy(buffer, text);
delete[] text;
GlobalUnlock(clipbuffer);
SetClipboardData(reg_dx==1?CF_TEXT:CF_OEMTEXT,clipbuffer);
reg_ax++;
CloseClipboard();
}
return true;
case 0x1704:
reg_ax=0;
if ((reg_dx==1||reg_dx==7)&&OpenClipboard(NULL))
{
if (HANDLE text = GetClipboardData(reg_dx==1?CF_TEXT:CF_OEMTEXT))
{
reg_ax=(Bit16u)strlen((char *)text)+1;
reg_dx=(Bit16u)((strlen((char *)text)+1)/65536);
}
CloseClipboard();
}
return true;
case 0x1705:
reg_ax=0;
if ((reg_dx==1||reg_dx==7)&&OpenClipboard(NULL))
{
if (HANDLE text = GetClipboardData(reg_dx==1?CF_TEXT:CF_OEMTEXT))
{
MEM_BlockWrite(SegPhys(es)+reg_bx,text,(Bitu)(strlen((char *)text)+1));
reg_ax++;
}
CloseClipboard();
}
return true;
case 0x1708:
reg_ax=CloseClipboard()?1:0;
return true;
#endif
case 0x1a00: /* ANSI.SYS installation check (MS-DOS 4.0 or higher) */
if (IS_PC98_ARCH) {
/* NTS: PC-98 MS-DOS has ANSI handling directly within the kernel HOWEVER it does NOT
* respond to this INT 2Fh call. */
return true;
}
else if (ANSI_SYS_installed()) {
/* See also: [http://www.delorie.com/djgpp/doc/rbinter/id/71/46.html] */
/* Reported behavior was confirmed with ANSI.SYS loaded on a Windows 95 MS-DOS boot disk, result AX=1AFF */
reg_al = 0xFF; /* DOSBox/DOSBox-X console device emulates ANSI.SYS, so respond like it's installed */
return true;
}
else {
/* MS-DOS without ANSI.SYS loaded doesn't modify any registers in response to this call. */
return true;
}
break;
case 0x4680: /* Windows v3.0 check */
// Leave AX as 0x4680, indicating that Windows 3.0 is not running in real (/R) or standard (/S) mode,
// nor is DOS 5 DOSSHELL active
return true;
case 0x4a01: { /* Query free hma space */
Bit32u limit = DOS_HMA_LIMIT();
if (limit == 0) {
/* TODO: What does MS-DOS prior to v5.0? */
reg_bx = 0;
reg_di = 0xFFFF;
SegSet16(es,0xFFFF);
LOG(LOG_MISC,LOG_DEBUG)("HMA query: rejected");
return true;
}
Bit32u start = DOS_HMA_FREE_START();
reg_bx = limit - start; /* free space in bytes */
SegSet16(es,0xffff);
reg_di = (start + 0x10) & 0xFFFF;
LOG(LOG_MISC,LOG_DEBUG)("HMA query: start=0x%06x limit=0x%06x free=0x%06x -> bx=%u %04x:%04x",
start,limit,DOS_HMA_GET_FREE_SPACE(),(int)reg_bx,(int)SegValue(es),(int)reg_di);
} return true;
case 0x4a02: { /* ALLOCATE HMA SPACE */
Bit32u limit = DOS_HMA_LIMIT();
if (limit == 0) {
/* TODO: What does MS-DOS prior to v5.0? */
reg_bx = 0;
reg_di = 0xFFFF;
SegSet16(es,0xFFFF);
LOG(LOG_MISC,LOG_DEBUG)("HMA allocation: rejected");
return true;
}
/* NTS: According to RBIL, Windows 95 adds a deallocate function and changes HMA allocation up to follow a
* MCB chain structure. Which is something we're probably not going to add for awhile. */
/* FIXME: So, according to Ralph Brown Interrupt List, MS-DOS 5 and 6 liked to round up to the next paragraph? */
if (dos.version.major < 7 && (reg_bx & 0xF) != 0)
reg_bx = (reg_bx + 0xF) & (~0xF);
Bit32u start = DOS_HMA_FREE_START();
if ((start+reg_bx) > limit) {
LOG(LOG_MISC,LOG_DEBUG)("HMA allocation: rejected (not enough room) for %u bytes (0x%x + 0x%x > 0x%x)",reg_bx,
(unsigned int)start,(unsigned int)reg_bx,(unsigned int)limit);
reg_bx = 0;
reg_di = 0xFFFF;
SegSet16(es,0xFFFF);
return true;
}
/* convert the start to segment:offset, normalized to FFFF:offset */
reg_di = (start + 0x10) & 0xFFFF;
SegSet16(es,0xFFFF);
/* let HMA emulation know what was claimed */
LOG(LOG_MISC,LOG_DEBUG)("HMA allocation: %u bytes at FFFF:%04x",reg_bx,reg_di);
DOS_HMA_CLAIMED(reg_bx);
} return true;
case 0x4a10: { /* Microsoft SmartDrive (SMARTDRV) API */
LOG(LOG_MISC,LOG_DEBUG)("Unhandled SMARTDRV call AX=%04x BX=%04x CX=%04x DX=%04x BP=%04x",reg_ax,reg_bx,reg_cx,reg_dx,reg_bp);
} return true;
case 0x4a11: { /* Microsoft DoubleSpace (DBLSPACE.BIN) API */
LOG(LOG_MISC,LOG_DEBUG)("Unhandled DBLSPACE call AX=%04x BX=%04x CX=%04x DX=%04x BP=%04x",reg_ax,reg_bx,reg_cx,reg_dx,reg_bp);
} return true;
case 0x4a16: /* Open bootlog */
return true;
case 0x4a17: /* Write bootlog */
MEM_StrCopy(SegPhys(ds)+reg_dx,name,255);
LOG(LOG_DOSMISC,LOG_NORMAL)("BOOTLOG: %s\n",name);
return true;
case 0x4a33: /* Check MS-DOS Version 7 */
if (dos.version.major > 6) {
reg_ax=0;
return true;
}
}
return false;
}
void DOS_SetupMisc(void) {
/* Setup the dos multiplex interrupt */
call_int2f=CALLBACK_Allocate();
CALLBACK_Setup(call_int2f,&INT2F_Handler,CB_IRET,"DOS Int 2f");
RealSetVec(0x2f,CALLBACK_RealPointer(call_int2f));
DOS_AddMultiplexHandler(DOS_MultiplexFunctions);
/* Setup the dos network interrupt */
call_int2a=CALLBACK_Allocate();
CALLBACK_Setup(call_int2a,&INT2A_Handler,CB_IRET,"DOS Int 2a");
RealSetVec(0x2A,CALLBACK_RealPointer(call_int2a));
}
void CALLBACK_DeAllocate(Bitu in);
void DOS_UninstallMisc(void) {
/* these vectors shouldn't exist when booting a guest OS */
if (call_int2a) {
RealSetVec(0x2a,0);
CALLBACK_DeAllocate(call_int2a);
call_int2a=0;
}
if (call_int2f) {
RealSetVec(0x2f,0);
CALLBACK_DeAllocate(call_int2f);
call_int2f=0;
}
}
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