path: root/src/dos/dos_ioctl.cpp

/*
 *  Copyright (C) 2002-2021  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 02110-1301, USA.
 */


#include <string.h>
#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "regs.h"
#include "bios_disk.h"
#include "dos_inc.h"
#include "drives.h"

bool DOS_IOCTL_AX440D_CH08(uint8_t drive,bool query) {
    PhysPt ptr	= SegPhys(ds)+reg_dx;
    switch (reg_cl) {
        case 0x40:		/* Set device parameters */
			{
				if (Drives[drive]->GetType() != DosDriveType::Fat) {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}
				fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
				if (fdp == NULL || fdp->readonly) {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}

				if (query) break;

				FAT_BootSector::bpb_union_t bpb=fdp->GetBPB();
				if (fdp->loadedDisk != NULL)
					fdp->loadedDisk->cylinders = mem_readw(ptr+4);				 // number of cylinders

				if (mem_readw(ptr+0xd) == 0 && mem_readw(ptr+0xf) == 0 && mem_readw(ptr+0x12) == 0) { // FAT32 BPB?
					bpb.v32.BPB_BytsPerSec = mem_readw(ptr+7);                   // bytes per sector (Win3 File Mgr. uses it)
					bpb.v32.BPB_SecPerClus = mem_readb(ptr+9);                   // sectors per cluster
					bpb.v32.BPB_RsvdSecCnt = mem_readw(ptr+0xa);                 // number of reserved sectors
					bpb.v32.BPB_NumFATs = mem_readb(ptr+0xc);                    // number of FATs
					bpb.v32.BPB_RootEntCnt = mem_readw(ptr+0xd);                 // number of root entries (Fake, the real BPB value is zero)
					bpb.v32.BPB_TotSec16 = mem_readw(ptr+0xf);                   // number of small sectors (always zero on BPB and returned by Win98)
					bpb.v32.BPB_Media = mem_readb(ptr+0x11);                     // media type
					bpb.v32.BPB_FATSz32 = (uint16_t)mem_readw(ptr+0x12);         // sectors per FAT (FIXME: What does Win98 do if this value > 0xFFFF?)
					bpb.v32.BPB_SecPerTrk = (uint16_t)mem_readw(ptr+0x14);       // sectors per track
					bpb.v32.BPB_NumHeads = (uint16_t)mem_readw(ptr+0x16);	     // number of heads
					bpb.v32.BPB_HiddSec = (uint32_t)mem_readd(ptr+0x18);         // number of hidden sectors
					bpb.v32.BPB_TotSec32 = (uint32_t)mem_readd(ptr+0x1c);        // number of big sectors
				} else {
					bpb.v.BPB_BytsPerSec = mem_readw(ptr+7);                     // bytes per sector (Win3 File Mgr. uses it)
					bpb.v.BPB_SecPerClus = mem_readb(ptr+9);                     // sectors per cluster
					bpb.v.BPB_RsvdSecCnt = mem_readw(ptr+0xa);                   // number of reserved sectors
					bpb.v.BPB_NumFATs = mem_readb(ptr+0xc);                      // number of FATs
					bpb.v.BPB_RootEntCnt = mem_readw(ptr+0xd);			         // number of root entries
					bpb.v.BPB_TotSec16 = mem_readw(ptr+0xf);                     // number of small sectors
					bpb.v.BPB_Media = mem_readb(ptr+0x11);                       // media type
					bpb.v.BPB_FATSz16 = (uint16_t)mem_readw(ptr+0x12);           // sectors per FAT
					bpb.v.BPB_SecPerTrk = (uint16_t)mem_readw(ptr+0x14);         // sectors per track
					bpb.v.BPB_NumHeads = (uint16_t)mem_readw(ptr+0x16);          // number of heads
					bpb.v.BPB_HiddSec = (uint32_t)mem_readd(ptr+0x18);           // number of hidden sectors
					bpb.v.BPB_TotSec32 = (uint32_t)mem_readd(ptr+0x1c);          // number of big sectors
				}
				fdp->SetBPB(bpb);
				break;
			}
        case 0x60:		/* Get device parameters */
			if (query) break;
			{
                //mem_writeb(ptr+0,0);					// special functions (call value)
                mem_writeb(ptr+1,(drive>=2)?0x05:0x07);	// type: hard disk(5), 1.44 floppy(7)
                mem_writew(ptr+2,(drive>=2)?0x01:0x00);	// attributes: bit 0 set for nonremovable
                mem_writew(ptr+4,(drive>=2)?0x3FF:0x50);// number of cylinders
                mem_writeb(ptr+6,0x00);					// media type (00=other type)
                // bios parameter block following
                fatDrive *fdp;
                FAT_BootSector::bpb_union_t bpb;
                bool usereal=false;
                if (Drives[drive]->GetType() == DosDriveType::Fat) {
                    fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                    if (fdp != NULL) {
                        bpb=fdp->GetBPB();
                        if (bpb.v.BPB_BytsPerSec && bpb.v.BPB_Media)
                            usereal=true;
                    }
                }
                if (usereal) {
                    if (fdp->loadedDisk != NULL)
                        mem_writew(ptr+4,fdp->loadedDisk->cylinders);				// number of cylinders

                    if (bpb.is_fat32()) {
                        /* Windows 98 behavior: Some of the FAT32 BPB fields are translated into FAT16 BPB fields even though those fields are zero in the actual BPB */
                        mem_writew(ptr+7,bpb.v32.BPB_BytsPerSec);                   // bytes per sector (Win3 File Mgr. uses it)
                        mem_writeb(ptr+9,bpb.v32.BPB_SecPerClus);                   // sectors per cluster
                        mem_writew(ptr+0xa,bpb.v32.BPB_RsvdSecCnt);                 // number of reserved sectors
                        mem_writeb(ptr+0xc,bpb.v32.BPB_NumFATs);                    // number of FATs
                        mem_writew(ptr+0xd,0x200);                                  // number of root entries (Fake, the real BPB value is zero)
                        mem_writew(ptr+0xf,0);                                      // number of small sectors (always zero on BPB and returned by Win98)
                        mem_writeb(ptr+0x11,bpb.v32.BPB_Media);                     // media type
                        mem_writew(ptr+0x12,(uint16_t)bpb.v32.BPB_FATSz32);         // sectors per FAT (FIXME: What does Win98 do if this value > 0xFFFF?)
                        mem_writew(ptr+0x14,(uint16_t)bpb.v32.BPB_SecPerTrk);       // sectors per track
                        mem_writew(ptr+0x16,(uint16_t)bpb.v32.BPB_NumHeads);	    // number of heads
                        mem_writed(ptr+0x18,(uint32_t)bpb.v32.BPB_HiddSec);         // number of hidden sectors
                        mem_writed(ptr+0x1c,(uint32_t)bpb.v32.BPB_TotSec32);        // number of big sectors
                    }
                    else {
                        mem_writew(ptr+7,bpb.v.BPB_BytsPerSec);                     // bytes per sector (Win3 File Mgr. uses it)
                        mem_writeb(ptr+9,bpb.v.BPB_SecPerClus);                     // sectors per cluster
                        mem_writew(ptr+0xa,bpb.v.BPB_RsvdSecCnt);                   // number of reserved sectors
                        mem_writeb(ptr+0xc,bpb.v.BPB_NumFATs);                      // number of FATs
                        mem_writew(ptr+0xd,bpb.v.BPB_RootEntCnt);			        // number of root entries
                        mem_writew(ptr+0xf,bpb.v.BPB_TotSec16);                     // number of small sectors
                        mem_writeb(ptr+0x11,bpb.v.BPB_Media);                       // media type
                        mem_writew(ptr+0x12,(uint16_t)bpb.v.BPB_FATSz16);           // sectors per FAT
                        mem_writew(ptr+0x14,(uint16_t)bpb.v.BPB_SecPerTrk);         // sectors per track
                        mem_writew(ptr+0x16,(uint16_t)bpb.v.BPB_NumHeads);          // number of heads
                        mem_writed(ptr+0x18,(uint32_t)bpb.v.BPB_HiddSec);           // number of hidden sectors
                        mem_writed(ptr+0x1c,(uint32_t)bpb.v.BPB_TotSec32);          // number of big sectors
                    }
                } else {
                    mem_writew(ptr+7,0x0200);									// bytes per sector (Win3 File Mgr. uses it)
                    mem_writew(ptr+9,(drive>=2)?0x20:0x01);						// sectors per cluster
                    mem_writew(ptr+0xa,0x0001);									// number of reserved sectors
                    mem_writew(ptr+0xc,0x02);									// number of FATs
                    mem_writew(ptr+0xd,(drive>=2)?0x0200:0x00E0);				// number of root entries
                    mem_writew(ptr+0xf,(drive>=2)?0x0000:0x0B40);				// number of small sectors
                    mem_writew(ptr+0x11,(drive>=2)?0xF8:0xF0);					// media type
                    mem_writew(ptr+0x12,(drive>=2)?0x00C9:0x0009);				// sectors per FAT
                    mem_writew(ptr+0x14,(drive>=2)?0x003F:0x0012);				// sectors per track
                    mem_writew(ptr+0x16,(drive>=2)?0x10:0x02);					// number of heads
                    mem_writed(ptr+0x18,0); 									// number of hidden sectors
                    mem_writed(ptr+0x1c,(drive>=2)?0x31F11:0x00); 				// number of big sectors
                }
                for (int i=0x20; i<0x22; i++)
                    mem_writeb(ptr+i,0);
                break;
            }
        case 0x42:  /* Format and verify logical device track (FORMAT.COM) */
            {
                /* 01h    WORD    number of disk head
                 * 03h    WORD    number of disk cylinder
                 * ---BYTE 00h bit 1 set---
                 * 05h    WORD    number of tracks to format */
                uint8_t flags = mem_readb(ptr+0);
                uint16_t head = mem_readw(ptr+1);
                uint16_t cyl = mem_readw(ptr+3);
                uint16_t ntracks = (flags & 0x1) ? mem_readw(ptr+5) : 1;
                uint16_t sect = 0;

                fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                if (fdp == NULL || fdp->readonly) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                if (query) break;

                /* BUT: These are C/H/S values relative to the partition!
                 * FIXME: MS-DOS may not adjust sector value, or maybe it does...
                 * perhaps there is a reason Linux fdisk warns about sector alignment to sect/track for MS-DOS partitions? */
                {
                    uint32_t adj = fdp->GetPartitionOffset();
                    sect += adj % fdp->loadedDisk->sectors;
                    adj /= fdp->loadedDisk->sectors;
                    head += adj % fdp->loadedDisk->heads;
                    adj /= fdp->loadedDisk->heads;
                    cyl += adj;

                    while (sect >= fdp->loadedDisk->sectors) {
                        sect -= fdp->loadedDisk->sectors;
                        head++;
                    }
                    while (head >= fdp->loadedDisk->heads) {
                        head -= fdp->loadedDisk->heads;
                        cyl++;
                    }

                    /* finally, MS-DOS counts sectors from 0 and BIOS INT 13h counts from 1 */
                    sect++;
                }

                // STUB!
                LOG_INFO("DOS:IOCTL Call 0D:42 Drive %2X pretending to format device track C/H/S=%u/%u/%u ntracks=%u",drive,cyl,head,sect,ntracks);
            }
            break;
        case 0x62:	/* Verify logical device track (FORMAT.COM) */
            {
                /* 01h    WORD    number of disk head
                 * 03h    WORD    number of disk cylinder
                 * 05h    WORD    number of tracks to verify */
                uint16_t head = mem_readw(ptr+1);
                uint16_t cyl = mem_readw(ptr+3);
                uint16_t ntracks = mem_readw(ptr+5);
                uint16_t sect = 0;

                fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                if (fdp == NULL) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                if (query) break;

                /* BUT: These are C/H/S values relative to the partition!
                 * FIXME: MS-DOS may not adjust sector value, or maybe it does...
                 * perhaps there is a reason Linux fdisk warns about sector alignment to sect/track for MS-DOS partitions? */
                {
                    uint32_t adj = fdp->GetPartitionOffset();
                    sect += adj % fdp->loadedDisk->sectors;
                    adj /= fdp->loadedDisk->sectors;
                    head += adj % fdp->loadedDisk->heads;
                    adj /= fdp->loadedDisk->heads;
                    cyl += adj;

                    while (sect >= fdp->loadedDisk->sectors) {
                        sect -= fdp->loadedDisk->sectors;
                        head++;
                    }
                    while (head >= fdp->loadedDisk->heads) {
                        head -= fdp->loadedDisk->heads;
                        cyl++;
                    }

                    /* finally, MS-DOS counts sectors from 0 and BIOS INT 13h counts from 1 */
                    sect++;
                }

                // STUB!
                LOG_INFO("DOS:IOCTL Call 0D:62 Drive %2X pretending to verify device track C/H/S=%u/%u/%u ntracks=%u",drive,cyl,head,sect,ntracks);
            }
            break;
        case 0x46:	/* Set volume serial number */
			if (query) break;
			{
				fatDrive* fdp = dynamic_cast<fatDrive*>(Drives[drive]);
				if (fdp == NULL || fdp->readonly) {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}

				FAT_BootSector::bpb_union_t bpb=fdp->GetBPB();
				unsigned long serial_number=mem_readd(ptr+2)?mem_readd(ptr+2):0x1234;
				if (bpb.is_fat32())
					bpb.v32.BS_VolID=serial_number;
				else
					bpb.v.BPB_VolID=serial_number;
				fdp->SetBPB(bpb);
			}
            break;
        case 0x66:	/* Get volume serial number */
			if (query) break;
			{
                char const* bufin=Drives[drive]->GetLabel();
                char buffer[11];memset(buffer,' ',11);

                char const* find_ext=strchr(bufin,'.');
                if (find_ext) {
                    Bitu size=(Bitu)(find_ext-bufin);
                    if (size>8) size=8;
                    memcpy(buffer,bufin,size);
                    find_ext++;
                    memcpy(buffer+8,find_ext,(strlen(find_ext)>3) ? 3 : strlen(find_ext)); 
                } else {
                    memcpy(buffer,bufin,(strlen(bufin) > 8) ? 8 : strlen(bufin));
                }

                char buf2[8]={ 'F','A','T','1','6',' ',' ',' '};
                if(drive<2) buf2[4] = '2'; //FAT12 for floppies

                //mem_writew(ptr+0,0);			//Info level (call value)
				unsigned long serial_number=0x1234;
				if (Drives[drive]->GetType() == DosDriveType::Fat) {
					fatDrive* fdp = dynamic_cast<fatDrive*>(Drives[drive]);
					if (fdp != NULL) serial_number=fdp->GetSerial();
				}
                mem_writed(ptr+2,serial_number);//Serial number
                MEM_BlockWrite(ptr+6,buffer,11);//volumename
                MEM_BlockWrite(ptr+0x11,buf2,8);//filesystem
            }
            break;
        case 0x41:  /* Write logical device track */
			{
                fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                if (fdp == NULL || fdp->readonly) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                uint8_t sectbuf[SECTOR_SIZE_MAX];

                if (fdp->loadedDisk == NULL) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                if (query) break;

                /* (RBIL) [http://www.ctyme.com/intr/rb-2896.htm]
                 * Offset  Size    Description     (Table 01562)
                 * 00h    BYTE    special functions (reserved, must be zero)
                 * 01h    WORD    number of disk head
                 * 03h    WORD    number of disk cylinder
                 * 05h    WORD    number of first sector to read/write
                 * 07h    WORD    number of sectors
                 * 09h    DWORD   transfer address */
                uint16_t head = mem_readw(ptr+1);
                uint16_t cyl = mem_readw(ptr+3);
                uint16_t sect = mem_readw(ptr+5);
                uint16_t nsect = mem_readw(ptr+7);
                uint32_t xfer_addr = mem_readd(ptr+9);
                PhysPt xfer_ptr = ((xfer_addr>>16u)<<4u)+(xfer_addr&0xFFFFu);
                uint16_t sectsize = fdp->loadedDisk->getSectSize();

                /* BUT: These are C/H/S values relative to the partition!
                 * FIXME: MS-DOS may not adjust sector value, or maybe it does...
                 * perhaps there is a reason Linux fdisk warns about sector alignment to sect/track for MS-DOS partitions? */
                {
                    uint32_t adj = fdp->GetPartitionOffset();
                    sect += adj % fdp->loadedDisk->sectors;
                    adj /= fdp->loadedDisk->sectors;
                    head += adj % fdp->loadedDisk->heads;
                    adj /= fdp->loadedDisk->heads;
                    cyl += adj;

                    while (sect >= fdp->loadedDisk->sectors) {
                        sect -= fdp->loadedDisk->sectors;
                        head++;
                    }
                    while (head >= fdp->loadedDisk->heads) {
                        head -= fdp->loadedDisk->heads;
                        cyl++;
                    }

                    /* finally, MS-DOS counts sectors from 0 and BIOS INT 13h counts from 1 */
                    sect++;
                }

                LOG_INFO("DOS:IOCTL Call 0D:41 Write Logical Device Track from Drive %2X C/H/S=%u/%u/%u num=%u from %04x:%04x sz=%u",
                        drive,cyl,head,sect,nsect,xfer_addr >> 16,xfer_addr & 0xFFFF,sectsize);

                while (nsect > 0) {
                    MEM_BlockRead(xfer_ptr,sectbuf,sectsize);

                    uint8_t status = fdp->loadedDisk->Write_Sector(head,cyl,sect,sectbuf);
                    if (status != 0) {
                        LOG_INFO("IOCTL 0D:61 write error at C/H/S %u/%u/%u",cyl,head,sect);
                        DOS_SetError(DOSERR_ACCESS_DENIED);//FIXME
                        return false;
                    }

                    xfer_ptr += sectsize;
                    nsect--;
                    sect++;
                }
            }
            break;
        case 0x61:  /* Read logical device track */
            {
                fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                if (fdp == NULL) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                uint8_t sectbuf[SECTOR_SIZE_MAX];

                if (fdp->loadedDisk == NULL) {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }

                if (query) break;

                /* (RBIL) [http://www.ctyme.com/intr/rb-2896.htm]
                 * Offset  Size    Description     (Table 01562)
                 * 00h    BYTE    special functions (reserved, must be zero)
                 * 01h    WORD    number of disk head
                 * 03h    WORD    number of disk cylinder
                 * 05h    WORD    number of first sector to read/write
                 * 07h    WORD    number of sectors
                 * 09h    DWORD   transfer address */
                uint16_t head = mem_readw(ptr+1);
                uint16_t cyl = mem_readw(ptr+3);
                uint16_t sect = mem_readw(ptr+5);
                uint16_t nsect = mem_readw(ptr+7);
                uint32_t xfer_addr = mem_readd(ptr+9);
                PhysPt xfer_ptr = ((xfer_addr>>16u)<<4u)+(xfer_addr&0xFFFFu);
                uint16_t sectsize = fdp->loadedDisk->getSectSize();

                /* BUT: These are C/H/S values relative to the partition!
                 * FIXME: MS-DOS may not adjust sector value, or maybe it does...
                 * perhaps there is a reason Linux fdisk warns about sector alignment to sect/track for MS-DOS partitions? */
                {
                    uint32_t adj = fdp->GetPartitionOffset();;
                    sect += adj % fdp->loadedDisk->sectors;
                    adj /= fdp->loadedDisk->sectors;
                    head += adj % fdp->loadedDisk->heads;
                    adj /= fdp->loadedDisk->heads;
                    cyl += adj;

                    while (sect >= fdp->loadedDisk->sectors) {
                        sect -= fdp->loadedDisk->sectors;
                        head++;
                    }
                    while (head >= fdp->loadedDisk->heads) {
                        head -= fdp->loadedDisk->heads;
                        cyl++;
                    }

                    /* finally, MS-DOS counts sectors from 0 and BIOS INT 13h counts from 1 */
                    sect++;
                }

                LOG_INFO("DOS:IOCTL Call 0D:61 Read Logical Device Track from Drive %2X C/H/S=%u/%u/%u num=%u to %04x:%04x sz=%u",
                        drive,cyl,head,sect,nsect,xfer_addr >> 16,xfer_addr & 0xFFFF,sectsize);

                while (nsect > 0) {
                    uint8_t status = fdp->loadedDisk->Read_Sector(head,cyl,sect,sectbuf);
                    if (status != 0) {
                        LOG_INFO("IOCTL 0D:61 read error at C/H/S %u/%u/%u",cyl,head,sect);
                        DOS_SetError(DOSERR_ACCESS_DENIED);//FIXME
                        return false;
                    }

                    MEM_BlockWrite(xfer_ptr,sectbuf,sectsize);
                    xfer_ptr += sectsize;
                    nsect--;
                    sect++;
                }
            }
            break;
        case 0x4A:
        case 0x4B:
        case 0x6A:
        case 0x6B:
			if (query) break;
			LOG(LOG_IOCTL,LOG_ERROR)("DOS:IOCTL Call 0D:%2X Drive %2X volume/drive locking IOCTL, faking it",reg_cl,drive);
            break;
		case 0x67: /* Get access flag (whether allowed by driver) */
			if (query) break;
			/* In DOSBox-X, disk access is always allowed.
			 * Real MS-DOS might be more restrictive, especially Windows 95 which requires volume locking before disk access is allowed */
			/* FDISK.EXE needs this IOCTL to determine whether it can read the partition and therefore whether the "system type" is "FAT16", "FAT12", "unknown" etc. */
			/* ptr+0 = special function (always zero)
			 * ptr+1 = return whether access allowed */
			mem_writeb(ptr+1,0x01);
			break;
        default:
            LOG_WARNING("DOS:IOCTL %s %2X:%2X Drive %2X unhandled (CH=08h)",query?"Query":"Call",reg_al,reg_cl,drive);
            DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
            return false;
    }
    reg_ax=0;
    return true;
}

bool DOS_IOCTL_AX440D_CH48(uint8_t drive,bool query) {
    PhysPt ptr	= SegPhys(ds)+reg_dx;
    switch (reg_cl) {
        case 0x40:		/* Set device parameters */
			{
				if (Drives[drive]->GetType() != DosDriveType::Fat) {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}
				fatDrive *fdp = dynamic_cast<fatDrive*>(Drives[drive]);
				if (fdp == NULL || fdp->readonly) {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}

				if (query) break;

				FAT_BootSector::bpb_union_t bpb=fdp->GetBPB();
				if (fdp->loadedDisk != NULL)
					fdp->loadedDisk->cylinders = mem_readw(ptr+4);	             // number of cylinders

				if (mem_readw(ptr+0xd) == 0 && mem_readw(ptr+0xf) == 0 && mem_readw(ptr+0x12) == 0) { // FAT32 BPB?
					bpb.v.BPB_BytsPerSec = mem_readw(ptr+7);                     // bytes per sector (Win3 File Mgr. uses it)
					bpb.v.BPB_SecPerClus = mem_readb(ptr+9);                     // sectors per cluster
					bpb.v.BPB_RsvdSecCnt = mem_readw(ptr+0xa);                   // number of reserved sectors
					bpb.v.BPB_NumFATs = mem_readb(ptr+0xc);                      // number of FATs
					bpb.v.BPB_RootEntCnt = mem_readw(ptr+0xd);			         // number of root entries
					bpb.v.BPB_TotSec16 = mem_readw(ptr+0xf);                     // number of small sectors
					bpb.v.BPB_Media = mem_readb(ptr+0x11);                       // media type
					bpb.v.BPB_FATSz16 = (uint16_t)mem_readw(ptr+0x12);           // sectors per FAT
					bpb.v.BPB_SecPerTrk = (uint16_t)mem_readw(ptr+0x14);         // sectors per track
					bpb.v.BPB_NumHeads = (uint16_t)mem_readw(ptr+0x16);          // number of heads
					bpb.v.BPB_HiddSec = (uint32_t)mem_readd(ptr+0x18);           // number of hidden sectors
					bpb.v.BPB_TotSec32 = (uint32_t)mem_readd(ptr+0x1c);          // number of big sectors
					bpb.v32.BPB_FATSz32 = (uint32_t)mem_readd(ptr+0x20);         // sectors per FAT
					bpb.v32.BPB_ExtFlags = (uint16_t)mem_readw(ptr+0x24);
					bpb.v32.BPB_FSVer = (uint16_t)mem_readw(ptr+0x26);
					bpb.v32.BPB_RootClus = (uint32_t)mem_readd(ptr+0x28);
					bpb.v32.BPB_FSInfo = (uint16_t)mem_readw(ptr+0x2C);
					bpb.v32.BPB_BkBootSec = (uint16_t)mem_readw(ptr+0x2E);
					fdp->SetBPB(bpb);
				} else {
					DOS_SetError(DOSERR_ACCESS_DENIED);
					return false;
				}
				break;
			}
        case 0x60:		/* Get device parameters */
			if (query) break;
			{
                //mem_writeb(ptr+0,0);					// special functions (call value)
                mem_writeb(ptr+1,(drive>=2)?0x05:0x07);	// type: hard disk(5), 1.44 floppy(7)
                mem_writew(ptr+2,(drive>=2)?0x01:0x00);	// attributes: bit 0 set for nonremovable
                mem_writew(ptr+4,(drive>=2)?0x3FF:0x50);// num of cylinders
                mem_writeb(ptr+6,0x00);					// media type (00=other type)
                // bios parameter block following
                fatDrive *fdp;
                FAT_BootSector::bpb_union_t bpb;
                bool usereal=false;
                if (Drives[drive]->GetType() == DosDriveType::Fat) {
                    fdp = dynamic_cast<fatDrive*>(Drives[drive]);
                    if (fdp != NULL) {
                        bpb=fdp->GetBPB();
                        if (bpb.v.BPB_BytsPerSec && bpb.v.BPB_Media)
                            usereal=true;
                    }
                }
                if (usereal) {
                    if (fdp->loadedDisk != NULL)
                        mem_writew(ptr+4,fdp->loadedDisk->cylinders);           // num of cylinders

                    if (bpb.is_fat32()) {
                        mem_writew(ptr+7,bpb.v.BPB_BytsPerSec);                     // bytes per sector (Win3 File Mgr. uses it)
                        mem_writeb(ptr+9,bpb.v.BPB_SecPerClus);                     // sectors per cluster
                        mem_writew(ptr+0xa,bpb.v.BPB_RsvdSecCnt);                   // number of reserved sectors
                        mem_writeb(ptr+0xc,bpb.v.BPB_NumFATs);                      // number of FATs
                        mem_writew(ptr+0xd,bpb.v.BPB_RootEntCnt);			        // number of root entries
                        mem_writew(ptr+0xf,bpb.v.BPB_TotSec16);                     // number of small sectors
                        mem_writeb(ptr+0x11,bpb.v.BPB_Media);                       // media type
                        mem_writew(ptr+0x12,(uint16_t)bpb.v.BPB_FATSz16);           // sectors per FAT
                        mem_writew(ptr+0x14,(uint16_t)bpb.v.BPB_SecPerTrk);         // sectors per track
                        mem_writew(ptr+0x16,(uint16_t)bpb.v.BPB_NumHeads);          // number of heads
                        mem_writed(ptr+0x18,(uint32_t)bpb.v.BPB_HiddSec);           // number of hidden sectors
                        mem_writed(ptr+0x1c,(uint32_t)bpb.v.BPB_TotSec32);          // number of big sectors
                        mem_writed(ptr+0x20,(uint32_t)bpb.v32.BPB_FATSz32);         // sectors per FAT
                        mem_writew(ptr+0x24,(uint16_t)bpb.v32.BPB_ExtFlags);
                        mem_writew(ptr+0x26,(uint16_t)bpb.v32.BPB_FSVer);
                        mem_writed(ptr+0x28,(uint32_t)bpb.v32.BPB_RootClus);
                        mem_writew(ptr+0x2C,(uint16_t)bpb.v32.BPB_FSInfo);
                        mem_writew(ptr+0x2E,(uint16_t)bpb.v32.BPB_BkBootSec);
                    }
                    else {
                        DOS_SetError(DOSERR_ACCESS_DENIED);
                        return false;
                    }
                } else {
                    DOS_SetError(DOSERR_ACCESS_DENIED);
                    return false;
                }
                break;
            }
        case 0x42:
        case 0x46:
        case 0x4A:
        case 0x4B:
        case 0x61:
        case 0x62:
        case 0x66:
        case 0x6A:
        case 0x6B:
            return DOS_IOCTL_AX440D_CH08(drive,query);
        default:
            LOG(LOG_IOCTL,LOG_ERROR)("DOS:IOCTL Call %02X:%2X Drive %2X unhandled (CH=48h)",reg_al,reg_cl,drive);
            DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
            return false;
    }
    reg_ax=0;
    return true;
}

bool DOS_IOCTL(void) {
//	LOG(LOG_IOCTL,LOG_WARN)("%X %X %X %X",reg_ax,reg_bx,reg_cx,reg_dx);
	uint8_t handle=0; // DOS managed up to 256 file handles (and our 'Files' array is 8-bit)
	uint8_t drive=0;
	/* calls 0-4,6,7,10,12,16 use a file handle */
	if ((reg_al<4) || (reg_al==0x06) || (reg_al==0x07) || (reg_al==0x0a) || (reg_al==0x0c) || (reg_al==0x10)) {
		handle=RealHandle(reg_bx);
		if (handle>=DOS_FILES) {
			DOS_SetError(DOSERR_INVALID_HANDLE);
			return false;
		}
		if (!Files[handle]) {
			DOS_SetError(DOSERR_INVALID_HANDLE);
			return false;
		}
	} else if (reg_al<0x12) { 				/* those use a diskdrive except 0x0b */
		if (reg_al!=0x0b) {
			drive=reg_bl;if (!drive) drive = DOS_GetDefaultDrive();else drive--;
			if( (drive >= 2) && !(( drive < DOS_DRIVES ) && Drives[drive]) ) {
				DOS_SetError(DOSERR_INVALID_DRIVE);
				return false;
			}
		}
	} else {
		LOG(LOG_DOSMISC,LOG_ERROR)("DOS:IOCTL Call %2X unhandled",reg_al);
		DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
		return false;
	}
	switch(reg_al) {
	case 0x00:		/* Get Device Information */
		if (Files[handle]->GetInformation() & 0x8000) {	//Check for device
			reg_dx = Files[handle]->GetInformation() & ~EXT_DEVICE_BIT;
		} else {
			uint8_t hdrive=Files[handle]->GetDrive();
			if (hdrive==0xff) {
				LOG(LOG_IOCTL,LOG_NORMAL)("00:No drive set");
				hdrive=2;	// defaulting to C:
			}
			/* return drive number in lower 5 bits for block devices */
			reg_dx=(Files[handle]->GetInformation()&0xffe0)|hdrive;
		}
		reg_ax=reg_dx; //Destroyed officially
		return true;
	case 0x01:		/* Set Device Information */
		if (reg_dh != 0) {
			DOS_SetError(DOSERR_DATA_INVALID);
			return false;
		} else {
			if (Files[handle]->GetInformation() & 0x8000) {	//Check for device
				reg_al = reinterpret_cast<DOS_Device *>(Files[handle])->GetStatus(true);
			} else {
				DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
				return false;
			}
		}
		return true;
	case 0x02:		/* Read from Device Control Channel */
		if (Files[handle]->GetInformation() & 0xc000) {
			/* is character device with IOCTL support */
			PhysPt bufptr=PhysMake(SegValue(ds),reg_dx);
			uint16_t retcode=0;
			if (((DOS_Device*)(Files[handle]))->ReadFromControlChannel(bufptr,reg_cx,&retcode)) {
				reg_ax=retcode;
				return true;
			}
		}
		DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
		return false;
	case 0x03:		/* Write to Device Control Channel */
		if (Files[handle]->GetInformation() & 0xc000) {
			/* is character device with IOCTL support */
			PhysPt bufptr=PhysMake(SegValue(ds),reg_dx);
			uint16_t retcode=0;
			if (((DOS_Device*)(Files[handle]))->WriteToControlChannel(bufptr,reg_cx,&retcode)) {
				reg_ax=retcode;
				return true;
			}
		}
		DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
		return false;
	case 0x06:      /* Get Input Status */
		if (Files[handle]->GetInformation() & 0x8000) {		//Check for device
			reg_al=(Files[handle]->GetInformation() & 0x40) ? 0x0 : 0xff;
		} else { // FILE
			uint32_t oldlocation=0;
			Files[handle]->Seek(&oldlocation, DOS_SEEK_CUR);
			uint32_t endlocation=0;
			Files[handle]->Seek(&endlocation, DOS_SEEK_END);
			if(oldlocation < endlocation){//Still data available
				reg_al=0xff;
			} else {
				reg_al=0x0; //EOF or beyond
			}
			Files[handle]->Seek(&oldlocation, DOS_SEEK_SET); //restore filelocation
			LOG(LOG_IOCTL,LOG_NORMAL)("06:Used Get Input Status on regular file with handle %u",handle);
		}
		return true;
	case 0x07:		/* Get Output Status */
		if (Files[handle]->GetInformation() & EXT_DEVICE_BIT) {
			reg_al = reinterpret_cast<DOS_Device *>(Files[handle])->GetStatus(false);
			return true;
		}
		LOG(LOG_IOCTL, LOG_NORMAL)("07:Fakes output status is ready for handle %u", handle);
		reg_al = 0xff;
		return true;
	case 0x08:		/* Check if block device removable */
		/* cdrom drives and drive a&b are removable */
		if (drive < 2) reg_ax=0;
		else if (!Drives[drive]->isRemovable()) reg_ax=1;
		else {
			DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
			return false;
		}
		return true;
	case 0x09:		/* Check if block device remote */
		if ((drive >= 2) && Drives[drive]->isRemote()) {
			reg_dx=0x1000;	// device is remote
			// undocumented bits always clear
		} else {
			reg_dx=0x0802;	// Open/Close supported; 32bit access supported (any use? fixes Fable installer)
			// undocumented bits from device attribute word
			// TODO Set bit 9 on drives that don't support direct I/O
		}
		reg_ax=0x300;
		return true;
	case 0x0B:		/* Set sharing retry count */
		if (reg_dx==0) {
			DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
			return false;
		}
		return true;
	case 0x0D:		/* Generic block device request */
	case 0x11:		/* query generic ioctl capability */
		{
			if (drive < 2 && !Drives[drive]) {
				DOS_SetError(DOSERR_ACCESS_DENIED);
				return false;
			}
			if (Drives[drive]->isRemovable()) {
				LOG_INFO("Attempt IOCTL AX=%04x CX=%04x on removable drive",reg_ax,reg_cx);
				DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
				return false;
			}
			if (reg_ch == 0x08) {
				return DOS_IOCTL_AX440D_CH08(drive,reg_al==0x11);
			}
			else if (reg_ch == 0x48) {
				return DOS_IOCTL_AX440D_CH48(drive,reg_al==0x11); // Same functions as CH=08h but for FAT32 drives
			}
			else {
				LOG_INFO("Attempt IOCTL AX=%04x CX=%04x",reg_ax,reg_cx);
				DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
				return false;
			}
		}
	case 0x0E:			/* Get Logical Drive Map */
		if (drive < 2) {
			if (Drives[drive]) reg_al=drive+1;
			else reg_al=1;
		} else if (Drives[drive]->isRemovable()) {
			DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
			return false;
		} else reg_al=0;	/* Only 1 logical drive assigned */
		reg_ah=0x07;
		return true;
	default:
		LOG(LOG_DOSMISC,LOG_ERROR)("DOS:IOCTL Call %2X unhandled",reg_al);
		DOS_SetError(DOSERR_FUNCTION_NUMBER_INVALID);
		break;
	}
	return false;
}


bool DOS_GetSTDINStatus(void) {
	uint32_t handle=RealHandle(STDIN);
	if (handle==0xFF) return false;
	if (Files[handle] && (Files[handle]->GetInformation() & 64)) return false;
	return true;
}