Bitu XMS_Handler(void) {
// LOG(LOG_MISC,LOG_ERROR)("XMS: CALL %02X",reg_ah);
switch (reg_ah) {
case XMS_GET_VERSION: /* 00 */
reg_ax=XMS_VERSION;
reg_bx=XMS_DRIVER_VERSION;
reg_dx=0; /* No we don't have HMA */
break;
case XMS_ALLOCATE_HIGH_MEMORY: /* 01 */
reg_ax=0;
reg_bl=HIGH_MEMORY_NOT_EXIST;
break;
case XMS_FREE_HIGH_MEMORY: /* 02 */
reg_ax=0;
reg_bl=HIGH_MEMORY_NOT_EXIST;
break;
case XMS_GLOBAL_ENABLE_A20: /* 03 */
case XMS_LOCAL_ENABLE_A20: /* 05 */
SET_RESULT(XMS_EnableA20(true));
break;
case XMS_GLOBAL_DISABLE_A20: /* 04 */
case XMS_LOCAL_DISABLE_A20: /* 06 */
SET_RESULT(XMS_EnableA20(false));
break;
case XMS_QUERY_A20: /* 07 */
reg_ax = XMS_GetEnabledA20();
reg_bl = 0;
break;
case XMS_QUERY_FREE_EXTENDED_MEMORY: /* 08 */
reg_bl = XMS_QueryFreeMemory(reg_ax,reg_dx);
break;
case XMS_ALLOCATE_ANY_MEMORY: /* 89 */
reg_edx &= 0xffff;
// fall through
case XMS_ALLOCATE_EXTENDED_MEMORY: /* 09 */
{
Bit16u handle = 0;
SET_RESULT(XMS_AllocateMemory(reg_dx,handle));
reg_dx = handle;
}; break;
case XMS_FREE_EXTENDED_MEMORY: /* 0a */
SET_RESULT(XMS_FreeMemory(reg_dx));
break;
case XMS_MOVE_EXTENDED_MEMORY_BLOCK: /* 0b */
SET_RESULT(XMS_MoveMemory(SegPhys(ds)+reg_si),false);
break;
case XMS_LOCK_EXTENDED_MEMORY_BLOCK: { /* 0c */
Bit32u address;
Bitu res = XMS_LockMemory(reg_dx, address);
if(res) reg_bl = (Bit8u)res;
reg_ax = (res==0);
if (res==0) { // success
reg_bx=(Bit16u)(address & 0xFFFF);
reg_dx=(Bit16u)(address >> 16);
};
}; break;
case XMS_UNLOCK_EXTENDED_MEMORY_BLOCK: /* 0d */
SET_RESULT(XMS_UnlockMemory(reg_dx));
break;
case XMS_GET_EMB_HANDLE_INFORMATION: /* 0e */
SET_RESULT(XMS_GetHandleInformation(reg_dx,reg_bh,reg_bl,reg_dx),false);
break;
case XMS_RESIZE_ANY_EXTENDED_MEMORY_BLOCK: /* 0x8f */
if(reg_ebx > reg_bx) LOG_MSG("64MB memory limit!");
//fall through
case XMS_RESIZE_EXTENDED_MEMORY_BLOCK: /* 0f */
SET_RESULT(XMS_ResizeMemory(reg_dx, reg_bx));
break;
case XMS_ALLOCATE_UMB: { /* 10 */
if (!umb_available) {
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
break;
}
Bit16u umb_start=dos_infoblock.GetStartOfUMBChain();
if (umb_start==0xffff) {
reg_ax=0;
reg_bl=UMB_NO_BLOCKS_AVAILABLE;
reg_dx=0; // no upper memory available
break;
}
/* Save status and linkage of upper UMB chain and link upper
memory to the regular MCB chain */
Bit8u umb_flag=dos_infoblock.GetUMBChainState();
if ((umb_flag&1)==0) DOS_LinkUMBsToMemChain(1);
Bit8u old_memstrat=DOS_GetMemAllocStrategy()&0xff;
DOS_SetMemAllocStrategy(0x40); // search in UMBs only
Bit16u size=reg_dx;Bit16u seg;
if (DOS_AllocateMemory(&seg,&size)) {
reg_ax=1;
reg_bx=seg;
} else {
reg_ax=0;
if (size==0) reg_bl=UMB_NO_BLOCKS_AVAILABLE;
else reg_bl=UMB_ONLY_SMALLER_BLOCK;
reg_dx=size; // size of largest available UMB
}
/* Restore status and linkage of upper UMB chain */
Bit8u current_umb_flag=dos_infoblock.GetUMBChainState();
if ((current_umb_flag&1)!=(umb_flag&1)) DOS_LinkUMBsToMemChain(umb_flag);
DOS_SetMemAllocStrategy(old_memstrat);
}
break;
case XMS_DEALLOCATE_UMB: /* 11 */
if (!umb_available) {
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
break;
}
if (dos_infoblock.GetStartOfUMBChain()!=0xffff) {
if (DOS_FreeMemory(reg_dx)) {
reg_ax=0x0001;
break;
}
}
reg_ax=0x0000;
reg_bl=UMB_NO_BLOCKS_AVAILABLE;
break;
case XMS_QUERY_ANY_FREE_MEMORY: /* 88 */
reg_bl = XMS_QueryFreeMemory(reg_ax,reg_dx);
reg_eax &= 0xffff;
reg_edx &= 0xffff;
reg_ecx = (MEM_TotalPages()*MEM_PAGESIZE)-1; // highest known physical memory address
break;
case XMS_GET_EMB_HANDLE_INFORMATION_EXT: { /* 8e */
Bit8u free_handles;
Bitu result = XMS_GetHandleInformation(reg_dx,reg_bh,free_handles,reg_dx);
if (result != 0) reg_bl = result;
else {
reg_edx &= 0xffff;
reg_cx = free_handles;
}
reg_ax = (result==0);
} break;
default:
LOG(LOG_MISC,LOG_ERROR)("XMS: unknown function %02X",reg_ah);
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
}
static bool DOS_MultiplexFunctions(void) {
switch (reg_ax) {
/* ert, 20100711: Locking extensions */
case 0x1000: /* SHARE.EXE installation check */
if (enable_share_exe_fake) {
reg_ax=0xffff; /* Pretend that share.exe is installed.. Of course it's a bloody LIE! */
}
else {
return false; /* pass it on */
}
break;
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);
Bitu sftofs=0x06+reg_bx*0x3b;
if (Files[reg_bx]) mem_writeb(sftptr+sftofs,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)); // 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+0x20+i),filename[i]);
for (i=nlen; i<8; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20+i),' ');
if (extlen>3) extlen=3;
for (i=0; i<extlen; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x28+i),dotpos[i]);
for (i=extlen; i<3; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x28+i),' ');
} 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+0x20+i),filename[i]);
for (i=nlen; i<11; i++)
mem_writeb((PhysPt)(sftptr+sftofs+0x20+i),' ');
}
SegSet16(es,RealSeg(sftrealpt));
reg_di=RealOff(sftrealpt+sftofs);
reg_ax=0xc000;
}
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;
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",reg_bx);
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;
}
return false;
}
