BasiliskII/src/disk.cpp

/*
 *  disk.cpp - Generic disk driver
 *
 *  Basilisk II (C) 1997-1999 Christian Bauer
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 *  SEE ALSO
 *    Inside Macintosh: Devices, chapter 1 "Device Manager"
 *    Technote DV 05: "Drive Queue Elements"
 *    Technote DV 23: "Driver Education"
 *    Technote FL 24: "Don't Look at ioPosOffset for Devices"
 */

#include <string.h>

#include "sysdeps.h"
#include "cpu_emulation.h"
#include "main.h"
#include "macos_util.h"
#include "sys.h"
#include "prefs.h"
#include "disk.h"

#define DEBUG 0
#include "debug.h"


// .Disk Disk/drive icon
const uint8 DiskIcon[258] = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
        0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01,
        0x80, 0x00, 0x00, 0x01, 0x8c, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01,
        0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

        0, 0
};


// Struct for each drive
struct DriveInfo {
        DriveInfo()
        {
                next = NULL;
                num = 0;
                fh = NULL;
                read_only = false;
                status = 0;
        }

        DriveInfo *next;        // Pointer to next DriveInfo (must be first in struct!)
        int num;                        // Drive number
        void *fh;                       // File handle
        uint32 num_blocks;      // Size in 512-byte blocks
        bool to_be_mounted;     // Flag: drive must be mounted in accRun
        bool read_only;         // Flag: force write protection
        uint32 status;          // Mac address of drive status record
};

// Linked list of DriveInfos
static DriveInfo *first_drive_info;

// Icon address (Mac address space, set by PatchROM())
uint32 DiskIconAddr;


/*
 *  Get pointer to drive info, NULL = invalid drive number
 */

static DriveInfo *get_drive_info(int num)
{
        DriveInfo *info = first_drive_info;
        while (info != NULL) {
                if (info->num == num)
                        return info;
                info = info->next;
        }
        return NULL;
}


/*
 *  Initialization
 */

void DiskInit(void)
{
        first_drive_info = NULL;

        // No drives specified in prefs? Then add defaults
        if (PrefsFindString("disk", 0) == NULL)
                SysAddDiskPrefs();

        // Add drives specified in preferences
        int32 index = 0;
        const char *str;
        while ((str = PrefsFindString("disk", index++)) != NULL) {
                bool read_only = false;
                if (str[0] == '*') {
                        read_only = true;
                        str++;
                }
                void *fh = Sys_open(str, read_only);
                if (fh) {
                        D(bug(" adding drive '%s'\n", str));
                        DriveInfo *info = new DriveInfo;
                        info->fh = fh;
                        info->read_only = SysIsReadOnly(fh);
                        DriveInfo *p = (DriveInfo *)&first_drive_info;
                        while (p->next != NULL)
                                p = p->next;
                        p->next = info;
                }
        }
}


/*
 *  Deinitialization
 */

void DiskExit(void)
{
        DriveInfo *info = first_drive_info, *next;
        while (info != NULL) {
                Sys_close(info->fh);
                next = info->next;
                delete info;
                info = next;
        }
}


/*
 *  Disk was inserted, flag for mounting
 */

bool DiskMountVolume(void *fh)
{
        DriveInfo *info;
        for (info = first_drive_info; info != NULL && info->fh != fh; info = info->next) ;
        if (info) {
                if (SysIsDiskInserted(info->fh)) {
                        info->read_only = SysIsReadOnly(info->fh);
                        WriteMacInt8(info->status + dsDiskInPlace, 1);  // Inserted removable disk
                        WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0xff : 0);
                        info->num_blocks = SysGetFileSize(info->fh) / 512;
                        WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
                        WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);
                        info->to_be_mounted = true;
                }
                return true;
        } else
                return false;
}


/*
 *  Driver Open() routine
 */

int16 DiskOpen(uint32 pb, uint32 dce)
{
        D(bug("DiskOpen\n"));

        // Set up DCE
        WriteMacInt32(dce + dCtlPosition, 0);

        // Install drives
        for (DriveInfo *info = first_drive_info; info; info = info->next) {

                info->num = FindFreeDriveNumber(1);
                info->to_be_mounted = false;

                if (info->fh) {

                        // Allocate drive status record
                        M68kRegisters r;
                        r.d[0] = SIZEOF_DrvSts;
                        Execute68kTrap(0xa71e, &r);             // NewPtrSysClear()
                        if (r.a[0] == 0)
                                continue;
                        info->status = r.a[0];
                        D(bug(" DrvSts at %08lx\n", info->status));

                        // Set up drive status
                        WriteMacInt16(info->status + dsQType, hard20);
                        WriteMacInt8(info->status + dsInstalled, 1);
                        bool disk_in_place = false;
                        if (SysIsFixedDisk(info->fh)) {
                                WriteMacInt8(info->status + dsDiskInPlace, 8);  // Fixed disk
                                disk_in_place = true;
                        } else if (SysIsDiskInserted(info->fh)) {
                                WriteMacInt8(info->status + dsDiskInPlace, 1);  // Inserted removable disk
                                disk_in_place = true;
                        }
                        if (disk_in_place) {
                                D(bug(" disk inserted\n"));
                                WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0x80 : 0);
                                info->num_blocks = SysGetFileSize(info->fh) / 512;
                                info->to_be_mounted = true;
                        }
                        D(bug(" %ld blocks\n", info->num_blocks));
                        WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
                        WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);

                        // Add drive to drive queue
                        D(bug(" adding drive %d\n", info->num));
                        r.d[0] = (info->num << 16) | (DiskRefNum & 0xffff);
                        r.a[0] = info->status + dsQLink;
                        Execute68kTrap(0xa04e, &r);     // AddDrive()
                }
        }
        return noErr;
}


/*
 *  Driver Prime() routine
 */

int16 DiskPrime(uint32 pb, uint32 dce)
{
        WriteMacInt32(pb + ioActCount, 0);

        // Drive valid and disk inserted?
        DriveInfo *info;
        if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
                return nsDrvErr;
        if (!ReadMacInt8(info->status + dsDiskInPlace))
                return offLinErr;

        // Get parameters
        void *buffer = Mac2HostAddr(ReadMacInt32(pb + ioBuffer));
        size_t length = ReadMacInt32(pb + ioReqCount);
        loff_t position = ReadMacInt32(dce + dCtlPosition);
        if (ReadMacInt16(pb + ioPosMode) & 0x100)       // 64 bit positioning
                position = ((loff_t)ReadMacInt32(pb + ioWPosOffset) << 32) || ReadMacInt32(pb + ioWPosOffset + 4);
        if ((length & 0x1ff) || (position & 0x1ff))
                return paramErr;

        size_t actual = 0;
        if ((ReadMacInt16(pb + ioTrap) & 0xff) == aRdCmd) {

                // Read
                actual = Sys_read(info->fh, buffer, position, length);
                if (actual != length)
                        return readErr;

        } else {

                // Write
                if (info->read_only)
                        return wPrErr;
                actual = Sys_write(info->fh, buffer, position, length);
                if (actual != length)
                        return writErr;
        }

        // Update ParamBlock and DCE
        WriteMacInt32(pb + ioActCount, actual);
        WriteMacInt32(dce + dCtlPosition, ReadMacInt32(dce + dCtlPosition) + actual);
        return noErr;
}


/*
 *  Driver Control() routine
 */

int16 DiskControl(uint32 pb, uint32 dce)
{
        uint16 code = ReadMacInt16(pb + csCode);
        D(bug("DiskControl %d\n", code));

        // General codes
        switch (code) {
                case 1:         // KillIO
                        return noErr;

                case 65: {      // Periodic action ("insert" disks on startup and check for disk changes)
                        DriveInfo *info = first_drive_info;
                        while (info != NULL) {

                                // Disk in drive?
                                if (!ReadMacInt8(info->status + dsDiskInPlace)) {

                                        // No, check if disk was inserted
                                        if (SysIsDiskInserted(info->fh))
                                                DiskMountVolume(info->fh);
                                }

                                // Mount disk if flagged
                                if (info->to_be_mounted) {
                                        D(bug(" mounting drive %d\n", info->num));
                                        M68kRegisters r;
                                        r.d[0] = info->num;
                                        r.a[0] = 7;     // diskEvent
                                        Execute68kTrap(0xa02f, &r);             // PostEvent()
                                        info->to_be_mounted = false;
                                }

                                info = info->next;
                        }
                        return noErr;
                }
        }

        // Drive valid?
        DriveInfo *info;
        if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
                return nsDrvErr;

        // Drive-specific codes
        switch (code) {
                case 5:         // Verify disk
                        if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
                                return noErr;
                        else
                                return offLinErr;

                case 6:         // Format disk
                        if (info->read_only)
                                return wPrErr;
                        else if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
                                return noErr;
                        else
                                return offLinErr;

                case 7:         // Eject disk
                        if (ReadMacInt8(info->status + dsDiskInPlace) == 8) {
                                // Fixed disk, re-insert
                                M68kRegisters r;
                                r.d[0] = info->num;
                                r.a[0] = 7;     // diskEvent
                                Execute68kTrap(0xa02f, &r);             // PostEvent()
                        } else if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
                                SysEject(info->fh);
                                WriteMacInt8(info->status + dsDiskInPlace, 0);
                        }
                        return noErr;

                case 21:        // Get drive icon
                case 22:        // Get disk icon
                        WriteMacInt32(pb + csParam, DiskIconAddr);
                        return noErr;

                case 23:        // Get drive info
                        if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
                                WriteMacInt32(pb + csParam, 0x0601);    // Unspecified fixed SCSI disk
                        else
                                WriteMacInt32(pb + csParam, 0x0201);    // Unspecified SCSI disk
                        return noErr;

                case 24:        // Get partition size
                        if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
                                WriteMacInt32(pb + csParam, info->num_blocks);
                                return noErr;
                        } else
                                return offLinErr;

                default:
                        printf("WARNING: Unknown DiskControl(%d)\n", code);
                        return controlErr;
        }
}


/*
 *  Driver Status() routine
 */

int16 DiskStatus(uint32 pb, uint32 dce)
{
        DriveInfo *info = get_drive_info(ReadMacInt16(pb + ioVRefNum));
        uint16 code = ReadMacInt16(pb + csCode);
        D(bug("DiskStatus %d\n", code));

        // General codes
        switch (code) {
                case 43: {      // Driver gestalt
                        uint32 sel = ReadMacInt32(pb + csParam);
                        D(bug(" driver gestalt %c%c%c%c\n", sel >> 24, sel >> 16,  sel >> 8, sel));
                        switch (sel) {
                                case 'vers':    // Version
                                        WriteMacInt32(pb + csParam + 4, 0x01008000);
                                        break;
                                case 'devt':    // Device type
                                        if (info != NULL) {
                                                if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
                                                        WriteMacInt32(pb + csParam + 4, 'disk');
                                                else
                                                        WriteMacInt32(pb + csParam + 4, 'rdsk');
                                        } else
                                                WriteMacInt32(pb + csParam + 4, 'disk');
                                        break;
                                case 'intf':    // Interface type
                                        WriteMacInt32(pb + csParam + 4, 'basi');
                                        break;
                                case 'sync':    // Only synchronous operation?
                                        WriteMacInt32(pb + csParam + 4, 0x01000000);
                                        break;
                                case 'boot':    // Boot ID
                                        if (info != NULL)
                                                WriteMacInt16(pb + csParam + 4, info->num);
                                        else
                                                WriteMacInt16(pb + csParam + 4, 0);
                                        WriteMacInt16(pb + csParam + 6, (uint16)DiskRefNum);
                                        break;
                                case 'wide':    // 64-bit access supported?
                                        WriteMacInt16(pb + csParam + 4, 0x0100);
                                        break;
                                case 'purg':    // Purge flags
                                        WriteMacInt32(pb + csParam + 4, 0);
                                        break;
                                case 'ejec':    // Eject flags
                                        WriteMacInt32(pb + csParam + 4, 0x00030003);    // Don't eject on shutdown/restart
                                        break;
                                case 'flus':    // Flush flags
                                        WriteMacInt16(pb + csParam + 4, 0);
                                        break;
                                case 'vmop':    // Virtual memory attributes
                                        WriteMacInt32(pb + csParam + 4, 0);     // Drive not available for VM
                                        break;
                                default:
                                        return statusErr;
                        }
                        return noErr;
                }
        }

        // Drive valid?
        if (info == NULL)
                return nsDrvErr;

        // Drive-specific codes
        switch (code) {
                case 8:         // Get drive status
                        memcpy(Mac2HostAddr(pb + csParam), Mac2HostAddr(info->status), 22);
                        return noErr;

                default:
                        printf("WARNING: Unknown DiskStatus(%d)\n", code);
                        return statusErr;
        }
}
Revision:	1.1.1.1 (vendor branch)
Committed:	1999-10-03T14:16:25Z (24 years, 7 months ago) by cebix
Branch:	cebix
CVS Tags:	release-0_7-2, start
Changes since 1.1:	+0 -0 lines
Log Message:	Imported sources
#	User	Rev	Content
1	cebix	1.1	/*
2			* disk.cpp - Generic disk driver
3			*
4			* Basilisk II (C) 1997-1999 Christian Bauer
5			*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			/*
22			* SEE ALSO
23			* Inside Macintosh: Devices, chapter 1 "Device Manager"
24			* Technote DV 05: "Drive Queue Elements"
25			* Technote DV 23: "Driver Education"
26			* Technote FL 24: "Don't Look at ioPosOffset for Devices"
27			*/
28
29			#include <string.h>
30
31			#include "sysdeps.h"
32			#include "cpu_emulation.h"
33			#include "main.h"
34			#include "macos_util.h"
35			#include "sys.h"
36			#include "prefs.h"
37			#include "disk.h"
38
39			#define DEBUG 0
40			#include "debug.h"
41
42
43			// .Disk Disk/drive icon
44			const uint8 DiskIcon[258] = {
45			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
50			0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01,
51			0x80, 0x00, 0x00, 0x01, 0x8c, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x01,
52			0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53
54			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
55			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
57			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
58			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
59			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
60			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
61			0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62
63			0, 0
64			};
65
66
67			// Struct for each drive
68			struct DriveInfo {
69			DriveInfo()
70			{
71			next = NULL;
72			num = 0;
73			fh = NULL;
74			read_only = false;
75			status = 0;
76			}
77
78			DriveInfo *next; // Pointer to next DriveInfo (must be first in struct!)
79			int num; // Drive number
80			void *fh; // File handle
81			uint32 num_blocks; // Size in 512-byte blocks
82			bool to_be_mounted; // Flag: drive must be mounted in accRun
83			bool read_only; // Flag: force write protection
84			uint32 status; // Mac address of drive status record
85			};
86
87			// Linked list of DriveInfos
88			static DriveInfo *first_drive_info;
89
90			// Icon address (Mac address space, set by PatchROM())
91			uint32 DiskIconAddr;
92
93
94			/*
95			* Get pointer to drive info, NULL = invalid drive number
96			*/
97
98			static DriveInfo *get_drive_info(int num)
99			{
100			DriveInfo *info = first_drive_info;
101			while (info != NULL) {
102			if (info->num == num)
103			return info;
104			info = info->next;
105			}
106			return NULL;
107			}
108
109
110			/*
111			* Initialization
112			*/
113
114			void DiskInit(void)
115			{
116			first_drive_info = NULL;
117
118			// No drives specified in prefs? Then add defaults
119			if (PrefsFindString("disk", 0) == NULL)
120			SysAddDiskPrefs();
121
122			// Add drives specified in preferences
123			int32 index = 0;
124			const char *str;
125			while ((str = PrefsFindString("disk", index++)) != NULL) {
126			bool read_only = false;
127			if (str[0] == '*') {
128			read_only = true;
129			str++;
130			}
131			void *fh = Sys_open(str, read_only);
132			if (fh) {
133			D(bug(" adding drive '%s'\n", str));
134			DriveInfo *info = new DriveInfo;
135			info->fh = fh;
136			info->read_only = SysIsReadOnly(fh);
137			DriveInfo p = (DriveInfo )&first_drive_info;
138			while (p->next != NULL)
139			p = p->next;
140			p->next = info;
141			}
142			}
143			}
144
145
146			/*
147			* Deinitialization
148			*/
149
150			void DiskExit(void)
151			{
152			DriveInfo info = first_drive_info, next;
153			while (info != NULL) {
154			Sys_close(info->fh);
155			next = info->next;
156			delete info;
157			info = next;
158			}
159			}
160
161
162			/*
163			* Disk was inserted, flag for mounting
164			*/
165
166			bool DiskMountVolume(void *fh)
167			{
168			DriveInfo *info;
169			for (info = first_drive_info; info != NULL && info->fh != fh; info = info->next) ;
170			if (info) {
171			if (SysIsDiskInserted(info->fh)) {
172			info->read_only = SysIsReadOnly(info->fh);
173			WriteMacInt8(info->status + dsDiskInPlace, 1); // Inserted removable disk
174			WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0xff : 0);
175			info->num_blocks = SysGetFileSize(info->fh) / 512;
176			WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
177			WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);
178			info->to_be_mounted = true;
179			}
180			return true;
181			} else
182			return false;
183			}
184
185
186			/*
187			* Driver Open() routine
188			*/
189
190			int16 DiskOpen(uint32 pb, uint32 dce)
191			{
192			D(bug("DiskOpen\n"));
193
194			// Set up DCE
195			WriteMacInt32(dce + dCtlPosition, 0);
196
197			// Install drives
198			for (DriveInfo *info = first_drive_info; info; info = info->next) {
199
200			info->num = FindFreeDriveNumber(1);
201			info->to_be_mounted = false;
202
203			if (info->fh) {
204
205			// Allocate drive status record
206			M68kRegisters r;
207			r.d[0] = SIZEOF_DrvSts;
208			Execute68kTrap(0xa71e, &r); // NewPtrSysClear()
209			if (r.a[0] == 0)
210			continue;
211			info->status = r.a[0];
212			D(bug(" DrvSts at %08lx\n", info->status));
213
214			// Set up drive status
215			WriteMacInt16(info->status + dsQType, hard20);
216			WriteMacInt8(info->status + dsInstalled, 1);
217			bool disk_in_place = false;
218			if (SysIsFixedDisk(info->fh)) {
219			WriteMacInt8(info->status + dsDiskInPlace, 8); // Fixed disk
220			disk_in_place = true;
221			} else if (SysIsDiskInserted(info->fh)) {
222			WriteMacInt8(info->status + dsDiskInPlace, 1); // Inserted removable disk
223			disk_in_place = true;
224			}
225			if (disk_in_place) {
226			D(bug(" disk inserted\n"));
227			WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0x80 : 0);
228			info->num_blocks = SysGetFileSize(info->fh) / 512;
229			info->to_be_mounted = true;
230			}
231			D(bug(" %ld blocks\n", info->num_blocks));
232			WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
233			WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);
234
235			// Add drive to drive queue
236			D(bug(" adding drive %d\n", info->num));
237			r.d[0] = (info->num << 16) \| (DiskRefNum & 0xffff);
238			r.a[0] = info->status + dsQLink;
239			Execute68kTrap(0xa04e, &r); // AddDrive()
240			}
241			}
242			return noErr;
243			}
244
245
246			/*
247			* Driver Prime() routine
248			*/
249
250			int16 DiskPrime(uint32 pb, uint32 dce)
251			{
252			WriteMacInt32(pb + ioActCount, 0);
253
254			// Drive valid and disk inserted?
255			DriveInfo *info;
256			if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
257			return nsDrvErr;
258			if (!ReadMacInt8(info->status + dsDiskInPlace))
259			return offLinErr;
260
261			// Get parameters
262			void *buffer = Mac2HostAddr(ReadMacInt32(pb + ioBuffer));
263			size_t length = ReadMacInt32(pb + ioReqCount);
264			loff_t position = ReadMacInt32(dce + dCtlPosition);
265			if (ReadMacInt16(pb + ioPosMode) & 0x100) // 64 bit positioning
266			position = ((loff_t)ReadMacInt32(pb + ioWPosOffset) << 32) \|\| ReadMacInt32(pb + ioWPosOffset + 4);
267			if ((length & 0x1ff) \|\| (position & 0x1ff))
268			return paramErr;
269
270			size_t actual = 0;
271			if ((ReadMacInt16(pb + ioTrap) & 0xff) == aRdCmd) {
272
273			// Read
274			actual = Sys_read(info->fh, buffer, position, length);
275			if (actual != length)
276			return readErr;
277
278			} else {
279
280			// Write
281			if (info->read_only)
282			return wPrErr;
283			actual = Sys_write(info->fh, buffer, position, length);
284			if (actual != length)
285			return writErr;
286			}
287
288			// Update ParamBlock and DCE
289			WriteMacInt32(pb + ioActCount, actual);
290			WriteMacInt32(dce + dCtlPosition, ReadMacInt32(dce + dCtlPosition) + actual);
291			return noErr;
292			}
293
294
295			/*
296			* Driver Control() routine
297			*/
298
299			int16 DiskControl(uint32 pb, uint32 dce)
300			{
301			uint16 code = ReadMacInt16(pb + csCode);
302			D(bug("DiskControl %d\n", code));
303
304			// General codes
305			switch (code) {
306			case 1: // KillIO
307			return noErr;
308
309			case 65: { // Periodic action ("insert" disks on startup and check for disk changes)
310			DriveInfo *info = first_drive_info;
311			while (info != NULL) {
312
313			// Disk in drive?
314			if (!ReadMacInt8(info->status + dsDiskInPlace)) {
315
316			// No, check if disk was inserted
317			if (SysIsDiskInserted(info->fh))
318			DiskMountVolume(info->fh);
319			}
320
321			// Mount disk if flagged
322			if (info->to_be_mounted) {
323			D(bug(" mounting drive %d\n", info->num));
324			M68kRegisters r;
325			r.d[0] = info->num;
326			r.a[0] = 7; // diskEvent
327			Execute68kTrap(0xa02f, &r); // PostEvent()
328			info->to_be_mounted = false;
329			}
330
331			info = info->next;
332			}
333			return noErr;
334			}
335			}
336
337			// Drive valid?
338			DriveInfo *info;
339			if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
340			return nsDrvErr;
341
342			// Drive-specific codes
343			switch (code) {
344			case 5: // Verify disk
345			if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
346			return noErr;
347			else
348			return offLinErr;
349
350			case 6: // Format disk
351			if (info->read_only)
352			return wPrErr;
353			else if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
354			return noErr;
355			else
356			return offLinErr;
357
358			case 7: // Eject disk
359			if (ReadMacInt8(info->status + dsDiskInPlace) == 8) {
360			// Fixed disk, re-insert
361			M68kRegisters r;
362			r.d[0] = info->num;
363			r.a[0] = 7; // diskEvent
364			Execute68kTrap(0xa02f, &r); // PostEvent()
365			} else if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
366			SysEject(info->fh);
367			WriteMacInt8(info->status + dsDiskInPlace, 0);
368			}
369			return noErr;
370
371			case 21: // Get drive icon
372			case 22: // Get disk icon
373			WriteMacInt32(pb + csParam, DiskIconAddr);
374			return noErr;
375
376			case 23: // Get drive info
377			if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
378			WriteMacInt32(pb + csParam, 0x0601); // Unspecified fixed SCSI disk
379			else
380			WriteMacInt32(pb + csParam, 0x0201); // Unspecified SCSI disk
381			return noErr;
382
383			case 24: // Get partition size
384			if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
385			WriteMacInt32(pb + csParam, info->num_blocks);
386			return noErr;
387			} else
388			return offLinErr;
389
390			default:
391			printf("WARNING: Unknown DiskControl(%d)\n", code);
392			return controlErr;
393			}
394			}
395
396
397			/*
398			* Driver Status() routine
399			*/
400
401			int16 DiskStatus(uint32 pb, uint32 dce)
402			{
403			DriveInfo *info = get_drive_info(ReadMacInt16(pb + ioVRefNum));
404			uint16 code = ReadMacInt16(pb + csCode);
405			D(bug("DiskStatus %d\n", code));
406
407			// General codes
408			switch (code) {
409			case 43: { // Driver gestalt
410			uint32 sel = ReadMacInt32(pb + csParam);
411			D(bug(" driver gestalt %c%c%c%c\n", sel >> 24, sel >> 16, sel >> 8, sel));
412			switch (sel) {
413			case 'vers': // Version
414			WriteMacInt32(pb + csParam + 4, 0x01008000);
415			break;
416			case 'devt': // Device type
417			if (info != NULL) {
418			if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
419			WriteMacInt32(pb + csParam + 4, 'disk');
420			else
421			WriteMacInt32(pb + csParam + 4, 'rdsk');
422			} else
423			WriteMacInt32(pb + csParam + 4, 'disk');
424			break;
425			case 'intf': // Interface type
426			WriteMacInt32(pb + csParam + 4, 'basi');
427			break;
428			case 'sync': // Only synchronous operation?
429			WriteMacInt32(pb + csParam + 4, 0x01000000);
430			break;
431			case 'boot': // Boot ID
432			if (info != NULL)
433			WriteMacInt16(pb + csParam + 4, info->num);
434			else
435			WriteMacInt16(pb + csParam + 4, 0);
436			WriteMacInt16(pb + csParam + 6, (uint16)DiskRefNum);
437			break;
438			case 'wide': // 64-bit access supported?
439			WriteMacInt16(pb + csParam + 4, 0x0100);
440			break;
441			case 'purg': // Purge flags
442			WriteMacInt32(pb + csParam + 4, 0);
443			break;
444			case 'ejec': // Eject flags
445			WriteMacInt32(pb + csParam + 4, 0x00030003); // Don't eject on shutdown/restart
446			break;
447			case 'flus': // Flush flags
448			WriteMacInt16(pb + csParam + 4, 0);
449			break;
450			case 'vmop': // Virtual memory attributes
451			WriteMacInt32(pb + csParam + 4, 0); // Drive not available for VM
452			break;
453			default:
454			return statusErr;
455			}
456			return noErr;
457			}
458			}
459
460			// Drive valid?
461			if (info == NULL)
462			return nsDrvErr;
463
464			// Drive-specific codes
465			switch (code) {
466			case 8: // Get drive status
467			memcpy(Mac2HostAddr(pb + csParam), Mac2HostAddr(info->status), 22);
468			return noErr;
469
470			default:
471			printf("WARNING: Unknown DiskStatus(%d)\n", code);
472			return statusErr;
473			}
474			}