rom/devs/scsi/bootwait.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id: bootwait.c 55802 2019-03-08 21:47:59Z wawa $
   4 */
   5
   6 #include <aros/debug.h>
   7 #include <proto/exec.h>
   8
   9 #include <aros/asmcall.h>
  10 #include <exec/resident.h>
  11 #include <libraries/expansionbase.h>
  12
  13 #include LC_LIBDEFS_FILE
  14
  15 #include "scsi.h"
  16
  17 #if defined(__AROSPLATFORM_SMP__)
  18 #include <aros/types/spinlock_s.h>
  19 #include <proto/execlock.h>
  20 #include <resources/execlock.h>
  21 #endif
  22
  23 extern const char scsi_LibName[];
  24 extern const char scsi_LibID[];
  25 extern const int scsi_End;
  26
  27 AROS_UFP3(static APTR, scsi_Wait,
  28           AROS_UFPA(void *, dummy, D0),
  29           AROS_UFPA(BPTR, segList, A0),
  30           AROS_UFPA(struct ExecBase *, SysBase, A6));
  31
  32 const struct Resident scsi_BootWait =
  33 {
  34     RTC_MATCHWORD,
  35     (struct Resident *)&scsi_BootWait,
  36     (void *)&scsi_End,
  37     RTF_COLDSTART,
  38     VERSION_NUMBER,
  39     NT_TASK,
  40     -49, /* dosboot.resource is -50 */
  41     "SCSI boot wait",
  42     &scsi_LibID[6],
  43     &scsi_Wait,
  44 };
  45
  46 /*
  47  * The purpose of this delay is to wait until device detection is done
  48  * before boot sequence enters DOS bootstrap. Without this we reach the
  49  * bootstrap earlier than devices are detected (and BootNodes inserted).
  50  * As a result, we end up in unbootable system.
  51  * Actually, i dislike this solution a bit. I think something else has
  52  * to be implemented. However i do not know what. Even if we rewrite
  53  * adding BootNodes, bootmenu still has to wait until all nodes are added.
  54  * Making device detection synchronous is IMHO not a good option, it will
  55  * increase booting time of our OS.
  56  */
  57
  58 AROS_UFH3(static APTR, scsi_Wait,
  59           AROS_UFPA(void *, dummy, D0),
  60           AROS_UFPA(BPTR, segList, A0),
  61           AROS_UFPA(struct ExecBase *, SysBase, A6))
  62 {
  63     AROS_USERFUNC_INIT
  64
  65     struct scsiBase *SCSIBase;
  66 #if defined(__AROSPLATFORM_SMP__)
  67     void *ExecLockBase = OpenResource("execlock.resource");
  68 #endif
  69
  70 #if defined(__AROSPLATFORM_SMP__)
  71     if (ExecLockBase)
  72         ObtainSystemLock(&SysBase->DeviceList, SPINLOCK_MODE_READ, LOCKF_FORBID);
  73     else
  74         Forbid();
  75 #else
  76     Forbid();
  77 #endif
  78
  79     /* We do not want to deal with IORequest and units, so just FindName() */
  80     SCSIBase = (struct scsiBase *)FindName(&SysBase->DeviceList, scsi_LibName);
  81
  82 #if defined(__AROSPLATFORM_SMP__)
  83     if (ExecLockBase)
  84         ReleaseSystemLock(&SysBase->DeviceList, LOCKF_FORBID);
  85     else
  86         Permit();
  87 #else
  88     Permit();
  89 #endif
  90
  91     if (SCSIBase)
  92     {
  93         D(bug("[SCSI  ] Waiting for device detection to complete...\n"));
  94         ObtainSemaphore(&SCSIBase->DetectionSem);
  95         ReleaseSemaphore(&SCSIBase->DetectionSem);
  96     }
  97
  98     return NULL;
  99
 100     AROS_USERFUNC_EXIT
 101 }