void DOS_InfoBlock::SetLocation(Bit16u segment) {
seg = segment;
pt=PhysMake(seg,0);
/* Clear the initial Block */
for(Bitu i=0;i<sizeof(sDIB);i++) mem_writeb(pt+i,0xff);
for(Bitu i=0;i<14;i++) mem_writeb(pt+i,0);
sSave(sDIB,regCXfrom5e,(Bit16u)0);
sSave(sDIB,countLRUcache,(Bit16u)0);
sSave(sDIB,countLRUopens,(Bit16u)0);
sSave(sDIB,protFCBs,(Bit16u)0);
sSave(sDIB,specialCodeSeg,(Bit16u)0);
sSave(sDIB,joindedDrives,(Bit8u)0);
sSave(sDIB,lastdrive,(Bit8u)0x01);//increase this if you add drives to cds-chain
sSave(sDIB,diskInfoBuffer,RealMake(segment,offsetof(sDIB,diskBufferHeadPt)));
sSave(sDIB,setverPtr,(Bit32u)0);
sSave(sDIB,a20FixOfs,(Bit16u)0);
sSave(sDIB,pspLastIfHMA,(Bit16u)0);
sSave(sDIB,blockDevices,(Bit8u)0);
sSave(sDIB,bootDrive,(Bit8u)0);
sSave(sDIB,useDwordMov,(Bit8u)1);
sSave(sDIB,extendedSize,(Bit16u)(MEM_TotalPages()*4-1024));
sSave(sDIB,magicWord,(Bit16u)0x0001); // dos5+
sSave(sDIB,sharingCount,(Bit16u)0);
sSave(sDIB,sharingDelay,(Bit16u)0);
sSave(sDIB,ptrCONinput,(Bit16u)0); // no unread input available
sSave(sDIB,maxSectorLength,(Bit16u)0x200);
sSave(sDIB,dirtyDiskBuffers,(Bit16u)0);
sSave(sDIB,lookaheadBufPt,(Bit32u)0);
sSave(sDIB,lookaheadBufNumber,(Bit16u)0);
sSave(sDIB,bufferLocation,(Bit8u)0); // buffer in base memory, no workspace
sSave(sDIB,workspaceBuffer,(Bit32u)0);
sSave(sDIB,minMemForExec,(Bit16u)0);
sSave(sDIB,memAllocScanStart,(Bit16u)DOS_MEM_START);
sSave(sDIB,startOfUMBChain,(Bit16u)0xffff);
sSave(sDIB,chainingUMB,(Bit8u)0);
sSave(sDIB,nulNextDriver,(Bit32u)0xffffffff);
sSave(sDIB,nulAttributes,(Bit16u)0x8004);
sSave(sDIB,nulStrategy,(Bit32u)0x00000000);
sSave(sDIB,nulString[0],(Bit8u)0x4e);
sSave(sDIB,nulString[1],(Bit8u)0x55);
sSave(sDIB,nulString[2],(Bit8u)0x4c);
sSave(sDIB,nulString[3],(Bit8u)0x20);
sSave(sDIB,nulString[4],(Bit8u)0x20);
sSave(sDIB,nulString[5],(Bit8u)0x20);
sSave(sDIB,nulString[6],(Bit8u)0x20);
sSave(sDIB,nulString[7],(Bit8u)0x20);
/* Create a fake SFT, so programs think there are 100 file handles */
Bit16u sftOffset=offsetof(sDIB,firstFileTable)+0xa2;
sSave(sDIB,firstFileTable,RealMake(segment,sftOffset));
real_writed(segment,sftOffset+0x00,RealMake(segment+0x26,0)); //Next File Table
real_writew(segment,sftOffset+0x04,100); //File Table supports 100 files
real_writed(segment+0x26,0x00,0xffffffff); //Last File Table
real_writew(segment+0x26,0x04,100); //File Table supports 100 files
}
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;
}
