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;

// Number of ticks between checks for disk insertion
const int driver_delay = 120;

// Flag: Control(accRun) has been called, interrupt routine is now active
static bool acc_run_called = false;


/*
 *  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;
}


/*
 *  Mount volumes for which the to_be_mounted flag is set
 *  (called during interrupt time)
 */

static void mount_mountable_volumes(void)
{
        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;
        }
}


/*
 *  Driver Open() routine
 */

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

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

        // 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(" %d 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 (accRun, "insert" disks on startup)
                        mount_mountable_volumes();
                        WriteMacInt16(dce + dCtlFlags, ReadMacInt16(dce + dCtlFlags) & ~0x2000);        // Disable periodic action
                        acc_run_called = true;
                        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
                        Mac2Mac_memcpy(pb + csParam, info->status, 22);
                        return noErr;

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


/*
 *  Driver interrupt routine - check for volumes to be mounted
 */

void DiskInterrupt(void)
{
        static int tick_count = 0;
        if (!acc_run_called)
                return;

        tick_count++;
        if (tick_count > driver_delay) {
                tick_count = 0;
                mount_mountable_volumes();
        }
}
Revision:	1.4
Committed:	1999-11-03T10:56:12Z (25 years ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-22121999, release-0_8-1
Changes since 1.3:	+1 -1 lines
Log Message:	- imported UAE CPU 0.8.10 changes - new utility functions Mac_memset, Mac2Host_memcpy, Host2Mac_memcpu and Mac2Mac_memcpy - extfs.cpp: fixed bug in fs_rename() and fs_cat_move() (auxiliary IOParam block was not in Mac address space) - some provisions for using UAE CPU compiler (doesn't work yet)
#	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	cebix	1.2	// Number of ticks between checks for disk insertion
94			const int driver_delay = 120;
95
96			// Flag: Control(accRun) has been called, interrupt routine is now active
97			static bool acc_run_called = false;
98
99	cebix	1.1
100			/*
101			* Get pointer to drive info, NULL = invalid drive number
102			*/
103
104			static DriveInfo *get_drive_info(int num)
105			{
106			DriveInfo *info = first_drive_info;
107			while (info != NULL) {
108			if (info->num == num)
109			return info;
110			info = info->next;
111			}
112			return NULL;
113			}
114
115
116			/*
117			* Initialization
118			*/
119
120			void DiskInit(void)
121			{
122			first_drive_info = NULL;
123
124			// No drives specified in prefs? Then add defaults
125			if (PrefsFindString("disk", 0) == NULL)
126			SysAddDiskPrefs();
127
128			// Add drives specified in preferences
129			int32 index = 0;
130			const char *str;
131			while ((str = PrefsFindString("disk", index++)) != NULL) {
132			bool read_only = false;
133			if (str[0] == '*') {
134			read_only = true;
135			str++;
136			}
137			void *fh = Sys_open(str, read_only);
138			if (fh) {
139			D(bug(" adding drive '%s'\n", str));
140			DriveInfo *info = new DriveInfo;
141			info->fh = fh;
142			info->read_only = SysIsReadOnly(fh);
143			DriveInfo p = (DriveInfo )&first_drive_info;
144			while (p->next != NULL)
145			p = p->next;
146			p->next = info;
147			}
148			}
149			}
150
151
152			/*
153			* Deinitialization
154			*/
155
156			void DiskExit(void)
157			{
158			DriveInfo info = first_drive_info, next;
159			while (info != NULL) {
160			Sys_close(info->fh);
161			next = info->next;
162			delete info;
163			info = next;
164			}
165			}
166
167
168			/*
169			* Disk was inserted, flag for mounting
170			*/
171
172			bool DiskMountVolume(void *fh)
173			{
174			DriveInfo *info;
175			for (info = first_drive_info; info != NULL && info->fh != fh; info = info->next) ;
176			if (info) {
177			if (SysIsDiskInserted(info->fh)) {
178			info->read_only = SysIsReadOnly(info->fh);
179			WriteMacInt8(info->status + dsDiskInPlace, 1); // Inserted removable disk
180			WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0xff : 0);
181			info->num_blocks = SysGetFileSize(info->fh) / 512;
182			WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
183			WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);
184			info->to_be_mounted = true;
185			}
186			return true;
187			} else
188			return false;
189			}
190
191
192			/*
193	cebix	1.2	* Mount volumes for which the to_be_mounted flag is set
194			* (called during interrupt time)
195			*/
196
197			static void mount_mountable_volumes(void)
198			{
199			DriveInfo *info = first_drive_info;
200			while (info != NULL) {
201
202			// Disk in drive?
203			if (!ReadMacInt8(info->status + dsDiskInPlace)) {
204
205			// No, check if disk was inserted
206			if (SysIsDiskInserted(info->fh))
207			DiskMountVolume(info->fh);
208			}
209
210			// Mount disk if flagged
211			if (info->to_be_mounted) {
212			D(bug(" mounting drive %d\n", info->num));
213			M68kRegisters r;
214			r.d[0] = info->num;
215			r.a[0] = 7; // diskEvent
216			Execute68kTrap(0xa02f, &r); // PostEvent()
217			info->to_be_mounted = false;
218			}
219
220			info = info->next;
221			}
222			}
223
224
225			/*
226	cebix	1.1	* Driver Open() routine
227			*/
228
229			int16 DiskOpen(uint32 pb, uint32 dce)
230			{
231			D(bug("DiskOpen\n"));
232
233			// Set up DCE
234			WriteMacInt32(dce + dCtlPosition, 0);
235	cebix	1.2	acc_run_called = false;
236	cebix	1.1
237			// Install drives
238			for (DriveInfo *info = first_drive_info; info; info = info->next) {
239
240			info->num = FindFreeDriveNumber(1);
241			info->to_be_mounted = false;
242
243			if (info->fh) {
244
245			// Allocate drive status record
246			M68kRegisters r;
247			r.d[0] = SIZEOF_DrvSts;
248			Execute68kTrap(0xa71e, &r); // NewPtrSysClear()
249			if (r.a[0] == 0)
250			continue;
251			info->status = r.a[0];
252			D(bug(" DrvSts at %08lx\n", info->status));
253
254			// Set up drive status
255			WriteMacInt16(info->status + dsQType, hard20);
256			WriteMacInt8(info->status + dsInstalled, 1);
257			bool disk_in_place = false;
258			if (SysIsFixedDisk(info->fh)) {
259			WriteMacInt8(info->status + dsDiskInPlace, 8); // Fixed disk
260			disk_in_place = true;
261			} else if (SysIsDiskInserted(info->fh)) {
262			WriteMacInt8(info->status + dsDiskInPlace, 1); // Inserted removable disk
263			disk_in_place = true;
264			}
265			if (disk_in_place) {
266			D(bug(" disk inserted\n"));
267			WriteMacInt8(info->status + dsWriteProt, info->read_only ? 0x80 : 0);
268			info->num_blocks = SysGetFileSize(info->fh) / 512;
269			info->to_be_mounted = true;
270			}
271	cebix	1.3	D(bug(" %d blocks\n", info->num_blocks));
272	cebix	1.1	WriteMacInt16(info->status + dsDriveSize, info->num_blocks & 0xffff);
273			WriteMacInt16(info->status + dsDriveS1, info->num_blocks >> 16);
274
275			// Add drive to drive queue
276			D(bug(" adding drive %d\n", info->num));
277			r.d[0] = (info->num << 16) \| (DiskRefNum & 0xffff);
278			r.a[0] = info->status + dsQLink;
279			Execute68kTrap(0xa04e, &r); // AddDrive()
280			}
281			}
282			return noErr;
283			}
284
285
286			/*
287			* Driver Prime() routine
288			*/
289
290			int16 DiskPrime(uint32 pb, uint32 dce)
291			{
292			WriteMacInt32(pb + ioActCount, 0);
293
294			// Drive valid and disk inserted?
295			DriveInfo *info;
296			if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
297			return nsDrvErr;
298			if (!ReadMacInt8(info->status + dsDiskInPlace))
299			return offLinErr;
300
301			// Get parameters
302			void *buffer = Mac2HostAddr(ReadMacInt32(pb + ioBuffer));
303			size_t length = ReadMacInt32(pb + ioReqCount);
304			loff_t position = ReadMacInt32(dce + dCtlPosition);
305			if (ReadMacInt16(pb + ioPosMode) & 0x100) // 64 bit positioning
306			position = ((loff_t)ReadMacInt32(pb + ioWPosOffset) << 32) \|\| ReadMacInt32(pb + ioWPosOffset + 4);
307			if ((length & 0x1ff) \|\| (position & 0x1ff))
308			return paramErr;
309
310			size_t actual = 0;
311			if ((ReadMacInt16(pb + ioTrap) & 0xff) == aRdCmd) {
312
313			// Read
314			actual = Sys_read(info->fh, buffer, position, length);
315			if (actual != length)
316			return readErr;
317
318			} else {
319
320			// Write
321			if (info->read_only)
322			return wPrErr;
323			actual = Sys_write(info->fh, buffer, position, length);
324			if (actual != length)
325			return writErr;
326			}
327
328			// Update ParamBlock and DCE
329			WriteMacInt32(pb + ioActCount, actual);
330			WriteMacInt32(dce + dCtlPosition, ReadMacInt32(dce + dCtlPosition) + actual);
331			return noErr;
332			}
333
334
335			/*
336			* Driver Control() routine
337			*/
338
339			int16 DiskControl(uint32 pb, uint32 dce)
340			{
341			uint16 code = ReadMacInt16(pb + csCode);
342			D(bug("DiskControl %d\n", code));
343
344			// General codes
345			switch (code) {
346			case 1: // KillIO
347			return noErr;
348
349	cebix	1.2	case 65: { // Periodic action (accRun, "insert" disks on startup)
350			mount_mountable_volumes();
351			WriteMacInt16(dce + dCtlFlags, ReadMacInt16(dce + dCtlFlags) & ~0x2000); // Disable periodic action
352			acc_run_called = true;
353	cebix	1.1	return noErr;
354			}
355			}
356
357			// Drive valid?
358			DriveInfo *info;
359			if ((info = get_drive_info(ReadMacInt16(pb + ioVRefNum))) == NULL)
360			return nsDrvErr;
361
362			// Drive-specific codes
363			switch (code) {
364			case 5: // Verify disk
365			if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
366			return noErr;
367			else
368			return offLinErr;
369
370			case 6: // Format disk
371			if (info->read_only)
372			return wPrErr;
373			else if (ReadMacInt8(info->status + dsDiskInPlace) > 0)
374			return noErr;
375			else
376			return offLinErr;
377
378			case 7: // Eject disk
379			if (ReadMacInt8(info->status + dsDiskInPlace) == 8) {
380			// Fixed disk, re-insert
381			M68kRegisters r;
382			r.d[0] = info->num;
383			r.a[0] = 7; // diskEvent
384			Execute68kTrap(0xa02f, &r); // PostEvent()
385			} else if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
386			SysEject(info->fh);
387			WriteMacInt8(info->status + dsDiskInPlace, 0);
388			}
389			return noErr;
390
391			case 21: // Get drive icon
392			case 22: // Get disk icon
393			WriteMacInt32(pb + csParam, DiskIconAddr);
394			return noErr;
395
396			case 23: // Get drive info
397			if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
398			WriteMacInt32(pb + csParam, 0x0601); // Unspecified fixed SCSI disk
399			else
400			WriteMacInt32(pb + csParam, 0x0201); // Unspecified SCSI disk
401			return noErr;
402
403			case 24: // Get partition size
404			if (ReadMacInt8(info->status + dsDiskInPlace) > 0) {
405			WriteMacInt32(pb + csParam, info->num_blocks);
406			return noErr;
407			} else
408			return offLinErr;
409
410			default:
411			printf("WARNING: Unknown DiskControl(%d)\n", code);
412			return controlErr;
413			}
414			}
415
416
417			/*
418			* Driver Status() routine
419			*/
420
421			int16 DiskStatus(uint32 pb, uint32 dce)
422			{
423			DriveInfo *info = get_drive_info(ReadMacInt16(pb + ioVRefNum));
424			uint16 code = ReadMacInt16(pb + csCode);
425			D(bug("DiskStatus %d\n", code));
426
427			// General codes
428			switch (code) {
429			case 43: { // Driver gestalt
430			uint32 sel = ReadMacInt32(pb + csParam);
431			D(bug(" driver gestalt %c%c%c%c\n", sel >> 24, sel >> 16, sel >> 8, sel));
432			switch (sel) {
433			case 'vers': // Version
434			WriteMacInt32(pb + csParam + 4, 0x01008000);
435			break;
436			case 'devt': // Device type
437			if (info != NULL) {
438			if (ReadMacInt8(info->status + dsDiskInPlace) == 8)
439			WriteMacInt32(pb + csParam + 4, 'disk');
440			else
441			WriteMacInt32(pb + csParam + 4, 'rdsk');
442			} else
443			WriteMacInt32(pb + csParam + 4, 'disk');
444			break;
445			case 'intf': // Interface type
446			WriteMacInt32(pb + csParam + 4, 'basi');
447			break;
448			case 'sync': // Only synchronous operation?
449			WriteMacInt32(pb + csParam + 4, 0x01000000);
450			break;
451			case 'boot': // Boot ID
452			if (info != NULL)
453			WriteMacInt16(pb + csParam + 4, info->num);
454			else
455			WriteMacInt16(pb + csParam + 4, 0);
456			WriteMacInt16(pb + csParam + 6, (uint16)DiskRefNum);
457			break;
458			case 'wide': // 64-bit access supported?
459			WriteMacInt16(pb + csParam + 4, 0x0100);
460			break;
461			case 'purg': // Purge flags
462			WriteMacInt32(pb + csParam + 4, 0);
463			break;
464			case 'ejec': // Eject flags
465			WriteMacInt32(pb + csParam + 4, 0x00030003); // Don't eject on shutdown/restart
466			break;
467			case 'flus': // Flush flags
468			WriteMacInt16(pb + csParam + 4, 0);
469			break;
470			case 'vmop': // Virtual memory attributes
471			WriteMacInt32(pb + csParam + 4, 0); // Drive not available for VM
472			break;
473			default:
474			return statusErr;
475			}
476			return noErr;
477			}
478			}
479
480			// Drive valid?
481			if (info == NULL)
482			return nsDrvErr;
483
484			// Drive-specific codes
485			switch (code) {
486			case 8: // Get drive status
487	cebix	1.4	Mac2Mac_memcpy(pb + csParam, info->status, 22);
488	cebix	1.1	return noErr;
489
490			default:
491			printf("WARNING: Unknown DiskStatus(%d)\n", code);
492			return statusErr;
493	cebix	1.2	}
494			}
495
496
497			/*
498			* Driver interrupt routine - check for volumes to be mounted
499			*/
500
501			void DiskInterrupt(void)
502			{
503			static int tick_count = 0;
504			if (!acc_run_called)
505			return;
506
507			tick_count++;
508			if (tick_count > driver_delay) {
509			tick_count = 0;
510			mount_mountable_volumes();
511	cebix	1.1	}
512			}