rom/filesys/fat/main.c

   1 /*
   2  * fat.handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007-2011 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
  40 struct Globals global_data;
  41 struct Globals *glob = &global_data;
  42
  43 const TEXT version_string[] = "$VER: fat.handler 41.52 (28.12.2011)";
  44
  45 LONG handler(struct ExecBase *SysBase) {
  46     struct Message *msg;
  47     struct DosPacket *startuppacket;
  48     LONG error = ERROR_NO_FREE_STORE;
  49
  50     memset(glob, 0, sizeof(struct Globals));
  51     NEWLIST(&glob->sblist);
  52     glob->ourtask = FindTask(NULL);
  53     glob->ourport = &((struct Process *)glob->ourtask)->pr_MsgPort;
  54     WaitPort(glob->ourport);
  55
  56     msg = GetMsg(glob->ourport);
  57     startuppacket = (struct DosPacket *) msg->mn_Node.ln_Name;
  58     glob->devnode = BADDR(startuppacket->dp_Arg3);
  59
  60     D(bug("\nFATFS: opening libraries.\n"));
  61     D(bug("\tFS task: %lx, port %lx\n", glob->ourtask, glob->ourport));
  62
  63     glob->notifyport = CreateMsgPort();
  64
  65     if ((DOSBase = (struct DosLibrary*)OpenLibrary("dos.library", 37))) {
  66         if ((IntuitionBase = OpenLibrary("intuition.library", 37))) {
  67             if ((UtilityBase = OpenLibrary("utility.library", 37))) {
  68                 glob->fssm = BADDR(startuppacket->dp_Arg2);
  69
  70                 if ((glob->mempool = CreatePool(MEMF_PUBLIC, DEF_POOL_SIZE, DEF_POOL_THRESHOLD))) {
  71
  72                     error = InitTimer();
  73                     if (!error) {
  74                         InitCharsetTables();
  75                         if ((error = InitDiskHandler(glob->fssm)) == 0) {
  76                             ULONG pktsig = 1 << glob->ourport->mp_SigBit;
  77                             ULONG diskchgsig = 1 << glob->diskchgsig_bit;
  78                             ULONG notifysig = 1 << glob->notifyport->mp_SigBit;
  79                             ULONG timersig = 1 << glob->timerport->mp_SigBit;
  80                             ULONG mask = pktsig | diskchgsig | notifysig | timersig;
  81                             ULONG sigs;
  82                             struct MsgPort *rp;
  83
  84                             D(bug("\tInitiated device: %s\n", AROS_BSTR_ADDR(glob->devnode->dol_Name)));
  85
  86                             glob->devnode->dol_Task = glob->ourport;
  87
  88                             D(bug("[fat] returning startup packet\n"));
  89
  90                             rp = startuppacket->dp_Port;
  91                             startuppacket->dp_Port = glob->ourport;
  92                             startuppacket->dp_Res1 = DOSTRUE;
  93                             startuppacket->dp_Res2 = 0;
  94                             PutMsg(rp, startuppacket->dp_Link);
  95
  96                             D(bug("Handler init finished.\n"));
  97
  98                             ProcessDiskChange(); /* insert disk */
  99
 100                             while(!glob->quit) {
 101                                 sigs = Wait(mask);
 102                                 if (sigs & diskchgsig)
 103                                     ProcessDiskChange();
 104                                 if (sigs & pktsig)
 105                                     ProcessPackets();
 106                                 if (sigs & notifysig)
 107                                     ProcessNotify();
 108                                 if (sigs & timersig)
 109                                     HandleTimer();
 110                             }
 111
 112                             D(bug("\nHandler shutdown initiated\n"));
 113
 114                             error = 0;
 115                             startuppacket = NULL;
 116
 117                             CleanupDiskHandler();
 118                         }
 119                         CleanupTimer();
 120                     }
 121                     DeletePool(glob->mempool);
 122                 }
 123                 else
 124                     error = ERROR_NO_FREE_STORE;
 125
 126                 CloseLibrary(UtilityBase);
 127             }
 128             CloseLibrary(IntuitionBase);
 129         }
 130         CloseLibrary((struct Library*)DOSBase);
 131     }
 132
 133     DeleteMsgPort(glob->notifyport);
 134
 135     if (glob->death_packet != NULL)
 136         ReplyPacket(glob->death_packet);
 137
 138     D(bug("The end.\n"));
 139
 140     if (startuppacket != NULL) {
 141         D(bug("[fat] returning startup packet\n"));
 142
 143         startuppacket->dp_Res1 = DOSTRUE;
 144         startuppacket->dp_Res2 = 0;
 145         ReplyPacket(startuppacket);
 146     }
 147
 148     return RETURN_OK;
 149 }
 150
 151 static struct IntData {
 152     struct Interrupt Interrupt;
 153     struct ExecBase *SysBase;
 154     struct Task *task;
 155     ULONG signal;
 156 } DiskChangeIntData;
 157
 158 static AROS_INTH1(DiskChangeIntHandler, struct IntData *,  MyIntData)
 159 {
 160     AROS_INTFUNC_INIT
 161
 162     struct ExecBase *SysBase = MyIntData->SysBase;
 163
 164     Signal(MyIntData->task, MyIntData->signal);
 165     return 0;
 166
 167     AROS_INTFUNC_EXIT
 168 }
 169
 170 LONG InitDiskHandler (struct FileSysStartupMsg *fssm) {
 171     LONG err;
 172     ULONG diskchgintbit, flags;
 173     IPTR unit;
 174     UBYTE *device;
 175
 176     unit = fssm->fssm_Unit;
 177     flags = fssm->fssm_Flags;
 178
 179     device = AROS_BSTR_ADDR(fssm->fssm_Device);
 180
 181     if ((diskchgintbit = AllocSignal(-1)) >= 0) {
 182         glob->diskchgsig_bit = diskchgintbit;
 183
 184         if ((glob->diskport = CreateMsgPort())) {
 185
 186             if ((glob->diskioreq = CreateIORequest(glob->diskport, sizeof(struct IOExtTD)))) {
 187
 188                 if (OpenDevice(device, unit, (struct IORequest *)glob->diskioreq, flags) == 0) {
 189                     D(bug("\tDevice successfully opened\n"));
 190                     Probe_64bit_support();
 191
 192                     if ((glob->diskchgreq = AllocVec(sizeof(struct IOExtTD), MEMF_PUBLIC))) {
 193                         CopyMem(glob->diskioreq, glob->diskchgreq, sizeof(struct IOExtTD));
 194
 195                         /* fill interrupt data */
 196                         DiskChangeIntData.SysBase = SysBase;
 197                         DiskChangeIntData.task = glob->ourtask;
 198                         DiskChangeIntData.signal = 1 << diskchgintbit;
 199
 200                         DiskChangeIntData.Interrupt.is_Node.ln_Type = NT_INTERRUPT;
 201                         DiskChangeIntData.Interrupt.is_Node.ln_Pri = 0;
 202                         DiskChangeIntData.Interrupt.is_Node.ln_Name = "FATFS";
 203                         DiskChangeIntData.Interrupt.is_Data = &DiskChangeIntData;
 204                         DiskChangeIntData.Interrupt.is_Code = (VOID_FUNC)AROS_ASMSYMNAME(DiskChangeIntHandler);
 205
 206                         /* fill io request data */
 207                         glob->diskchgreq->iotd_Req.io_Command = TD_ADDCHANGEINT;
 208                         glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 209                         glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 210                         glob->diskchgreq->iotd_Req.io_Flags = 0;
 211
 212                         SendIO((struct IORequest*)glob->diskchgreq);
 213
 214                         D(bug("\tDisk change interrupt handler installed\n"));
 215
 216                         return 0;
 217                     }
 218                     else
 219                         err = ERROR_NO_FREE_STORE;
 220
 221                     CloseDevice((struct IORequest *)glob->diskioreq);
 222                 }
 223                 else
 224                     err = ERROR_DEVICE_NOT_MOUNTED;
 225
 226                 DeleteIORequest(glob->diskioreq);
 227                 glob->diskioreq = NULL;
 228             }
 229             else
 230                 err = ERROR_NO_FREE_STORE;
 231
 232             DeleteMsgPort(glob->diskport);
 233             glob->diskport = NULL;
 234         }
 235         else
 236             err = ERROR_NO_FREE_STORE;
 237
 238         FreeSignal(diskchgintbit);
 239
 240         glob->diskchgsig_bit = 0;
 241     }
 242     else
 243         err = ERROR_NO_FREE_STORE;
 244
 245     return err;
 246 }
 247
 248 void CleanupDiskHandler(void) {
 249     D(bug("\tFreeing handler resources:\n"));
 250
 251     /* remove disk change interrupt */
 252     glob->diskchgreq->iotd_Req.io_Command = TD_REMCHANGEINT;
 253     glob->diskchgreq->iotd_Req.io_Data = &DiskChangeIntData.Interrupt;
 254     glob->diskchgreq->iotd_Req.io_Length = sizeof(struct Interrupt);
 255     glob->diskchgreq->iotd_Req.io_Flags = 0;
 256
 257     DoIO((struct IORequest*)glob->diskchgreq);
 258     D(bug("\tDisk change interrupt handler removed\n"));
 259
 260     CloseDevice((struct IORequest *)glob->diskioreq);
 261     DeleteIORequest(glob->diskioreq);
 262     FreeVec(glob->diskchgreq);
 263     DeleteMsgPort(glob->diskport);
 264     D(bug("\tDevice closed\n"));
 265
 266     glob->diskioreq = NULL;
 267     glob->diskchgreq = NULL;
 268     glob->diskport = NULL;
 269
 270     FreeSignal(glob->diskchgsig_bit);
 271
 272     D(bug("\tDone.\n"));
 273 }