rom/filesys/fat/main.c

   1 /*
   2  * fat-handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007-2015 The AROS Development Team
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the same terms as AROS itself.
   9  *
  10  * $Id$
  11  */
  12
  13 #include <aros/asmcall.h>
  14 #include <aros/macros.h>
  15 #include <exec/types.h>
  16 #include <exec/execbase.h>
  17 #include <exec/memory.h>
  18 #include <dos/dos.h>
  19 #include <dos/dosextens.h>
  20 #include <dos/dostags.h>
  21 #include <dos/filehandler.h>
  22 #include <devices/trackdisk.h>
  23
  24 #include <proto/exec.h>
  25 #include <proto/dos.h>
  26
  27 #include <string.h>
  28
  29 #include "fat_fs.h"
  30 #include "fat_protos.h"
  31 #include "charset.h"
  32
  33 #define DEBUG DEBUG_MISC
  34 #include "debug.h"
  35
  36 struct DosLibrary *DOSBase;
  37 struct Library *UtilityBase;
  38 struct Library *IntuitionBase;
  39 struct Device *TimerBase;
  40
  41 struct Globals global_data;
  42 struct Globals *glob = &global_data;
  43
  44 LONG handler(struct ExecBase *SysBase) {
  45     struct Message *msg;
  46     struct DosPacket *startuppacket;
  47     LONG error = ERROR_NO_FREE_STORE;
  48
  49     memset(glob, 0, sizeof(struct Globals));
  50     NEWLIST(&glob->sblist);
  51     glob->ourtask = FindTask(NULL);
  52     glob->ourport = &((struct Process *)glob->ourtask)->pr_MsgPort;
  53     WaitPort(glob->ourport);
  54
  55     msg = GetMsg(glob->ourport);
  56     startuppacket = (struct DosPacket *) msg->mn_Node.ln_Name;
  57     glob->devnode = BADDR(startuppacket->dp_Arg3);
  58
  59     D(bug("\nFATFS: opening libraries.\n"));
  60     D(bug("\tFS task: %lx, port %lx\n", glob->ourtask, glob->ourport));
  61
  62     glob->notifyport = CreateMsgPort();
  63
  64     if ((DOSBase = (struct DosLibrary*)OpenLibrary("dos.library", 37))) {
  65         if ((IntuitionBase = OpenLibrary("intuition.library", 37))) {
  66             if ((UtilityBase = OpenLibrary("utility.library", 37))) {
  67                 glob->fssm = BADDR(startuppacket->dp_Arg2);
  68
  69                 if ((glob->mempool = CreatePool(MEMF_PUBLIC, DEF_POOL_SIZE, DEF_POOL_THRESHOLD))) {
  70
  71                     error = InitTimer();
  72                     if (!error) {
  73                         TimerBase = glob->timereq->tr_node.io_Device;
  74
  75                         InitCharsetTables();
  76                         if ((error = InitDiskHandler(glob->fssm)) == 0) {
  77                             ULONG pktsig = 1 << glob->ourport->mp_SigBit;
  78                             ULONG diskchgsig = 1 << glob->diskchgsig_bit;
  79                             ULONG notifysig = 1 << glob->notifyport->mp_SigBit;
  80                             ULONG timersig = 1 << glob->timerport->mp_SigBit;
  81                             ULONG mask = pktsig | diskchgsig | notifysig | timersig;
  82                             ULONG sigs;
  83                             struct MsgPort *rp;
  84
  85                             D(bug("\tInitiated device: %s\n", AROS_BSTR_ADDR(glob->devnode->dol_Name)));
  86
  87                             glob->devnode->dol_Task = glob->ourport;
  88
  89                             D(bug("[fat] returning startup packet\n"));
  90
  91                             rp = startuppacket->dp_Port;
  92                             startuppacket->dp_Port = glob->ourport;
  93                             startuppacket->dp_Res1 = DOSTRUE;
  94                             startuppacket->dp_Res2 = 0;
  95                             PutMsg(rp, startuppacket->dp_Link);
  96
  97                             D(bug("Handler init finished.\n"));
  98
  99                             ProcessDiskChange(); /* insert disk */
 100
 101                             while(!glob->quit) {
 102                                 sigs = Wait(mask);
 103                                 if (sigs & diskchgsig)
 104                                     ProcessDiskChange();
 105                                 if (sigs & pktsig)
 106                                     ProcessPackets();
 107                                 if (sigs & notifysig)
 108                                     ProcessNotify();
 109                                 if (sigs & timersig)
 110                                     HandleTimer();
 111                             }
 112
 113                             D(bug("\nHandler shutdown initiated\n"));
 114
 115                             error = 0;
 116                             startuppacket = NULL;
 117
 118                             CleanupDiskHandler();
 119                         }
 120                         CleanupTimer();
 121                     }
 122                     DeletePool(glob->mempool);
 123                 }
 124                 else
 125                     error = ERROR_NO_FREE_STORE;
 126
 127                 CloseLibrary(UtilityBase);
 128             }
 129             CloseLibrary(IntuitionBase);
 130         }
 131         CloseLibrary((struct Library*)DOSBase);
 132     }
 133
 134     DeleteMsgPort(glob->notifyport);
 135
 136     if (glob->death_packet != NULL)
 137         ReplyPacket(glob->death_packet);
 138
 139     D(bug("The end.\n"));
 140
 141     if (startuppacket != NULL) {
 142         D(bug("[fat] returning startup packet\n"));
 143
 144         startuppacket->dp_Res1 = DOSTRUE;
 145         startuppacket->dp_Res2 = 0;
 146         ReplyPacket(startuppacket);
 147     }
 148
 149     return RETURN_OK;
 150 }
 151
 152 static struct IntData {
 153     struct Interrupt Interrupt;
 154     struct ExecBase *SysBase;
 155     struct Task *task;
 156     ULONG signal;
 157 } DiskChangeIntData;
 158
 159 static AROS_INTH1(DiskChangeIntHandler, struct IntData *,  MyIntData)
 160 {
 161     AROS_INTFUNC_INIT
 162
 163     struct ExecBase *SysBase = MyIntData->SysBase;
 164
 165     Signal(MyIntData->task, MyIntData->signal);
 166     return 0;
 167
 168     AROS_INTFUNC_EXIT
 169 }
 170
 171 LONG InitDiskHandler (struct FileSysStartupMsg *fssm) {
 172     LONG err;
 173     ULONG diskchgintbit, flags;
 174     IPTR unit;
 175     UBYTE *device;
 176
 177     unit = fssm->fssm_Unit;
 178     flags = fssm->fssm_Flags;
 179
 180     device = AROS_BSTR_ADDR(fssm->fssm_Device);
 181
 182     if ((diskchgintbit = AllocSignal(-1)) >= 0) {
 183         glob->diskchgsig_bit = diskchgintbit;
 184
 185         if ((glob->diskport = CreateMsgPort())) {
 186
 187             if ((glob->diskioreq = CreateIORequest(glob->diskport, sizeof(struct IOExtTD)))) {
 188
 189                 if (OpenDevice(device, unit, (struct IORequest *)glob->diskioreq, flags) == 0) {
 190                     D(bug("\tDevice successfully opened\n"));
 191                     Probe_64bit_support();
 192
 193                     if ((glob->diskchgreq = AllocVec(sizeof(struct IOExtTD), MEMF_PUBLIC))) {
 194                         CopyMem(glob->diskioreq, glob->diskchgreq, sizeof(struct IOExtTD));
 195
 196                         /* fill interrupt data */
 197                         DiskChangeIntData.SysBase = SysBase;
 198                         DiskChangeIntData.task = glob->ourtask;
 199                         DiskChangeIntData.signal = 1 << diskchgintbit;
 200
 201                         DiskChangeIntData.Interrupt.is_Node.ln_Type = NT_INTERRUPT;
 202                         DiskChangeIntData.Interrupt.is_Node.ln_Pri = 0;
 203                         DiskChangeIntData.Interrupt.is_Node.ln_Name = "FATFS";
 204                         DiskChangeIntData.Interrupt.is_Data = &DiskChangeIntData;
 205                         DiskChangeIntData.Interrupt.is_Code = (VOID_FUNC)AROS_ASMSYMNAME(DiskChangeIntHandler);
 206
 207                         /* fill io request data */
 208                         glob->diskchgreq->iotd_Req.io_Command = TD_ADDCHANGEINT;
 209                         glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 210                         glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 211                         glob->diskchgreq->iotd_Req.io_Flags = 0;
 212
 213                         SendIO((struct IORequest*)glob->diskchgreq);
 214
 215                         D(bug("\tDisk change interrupt handler installed\n"));
 216
 217                         return 0;
 218                     }
 219                     else
 220                         err = ERROR_NO_FREE_STORE;
 221
 222                     CloseDevice((struct IORequest *)glob->diskioreq);
 223                 }
 224                 else
 225                     err = ERROR_DEVICE_NOT_MOUNTED;
 226
 227                 DeleteIORequest(glob->diskioreq);
 228                 glob->diskioreq = NULL;
 229             }
 230             else
 231                 err = ERROR_NO_FREE_STORE;
 232
 233             DeleteMsgPort(glob->diskport);
 234             glob->diskport = NULL;
 235         }
 236         else
 237             err = ERROR_NO_FREE_STORE;
 238
 239         FreeSignal(diskchgintbit);
 240
 241         glob->diskchgsig_bit = 0;
 242     }
 243     else
 244         err = ERROR_NO_FREE_STORE;
 245
 246     return err;
 247 }
 248
 249 void CleanupDiskHandler(void) {
 250     D(bug("\tFreeing handler resources:\n"));
 251
 252     /* remove disk change interrupt */
 253     glob->diskchgreq->iotd_Req.io_Command = TD_REMCHANGEINT;
 254     glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 255     glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 256     glob->diskchgreq->iotd_Req.io_Flags = 0;
 257
 258     DoIO((struct IORequest*)glob->diskchgreq);
 259     D(bug("\tDisk change interrupt handler removed\n"));
 260
 261     CloseDevice((struct IORequest *)glob->diskioreq);
 262     DeleteIORequest(glob->diskioreq);
 263     FreeVec(glob->diskchgreq);
 264     DeleteMsgPort(glob->diskport);
 265     D(bug("\tDevice closed\n"));
 266
 267     glob->diskioreq = NULL;
 268     glob->diskchgreq = NULL;
 269     glob->diskport = NULL;
 270
 271     FreeSignal(glob->diskchgsig_bit);
 272
 273     D(bug("\tDone.\n"));
 274 }