rom/partition/readpartitiondata.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/libcall.h>
   7 #include <proto/exec.h>
   8
   9 #include "partition_intern.h"
  10 #include "partition_support.h"
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15         AROS_LH3QUAD1(LONG, ReadPartitionDataQ,
  16
  17 /*  SYNOPSIS */
  18         AROS_LHA(struct PartitionHandle *, Partition , A0),
  19         AROS_LHA(APTR                    , Buffer    , A1),
  20         AROS_LHA(ULONG                   , DataSize  , D0),
  21         AROS_LHAQUAD(UQUAD               , StartBlock, D1, D2),
  22
  23 /*  LOCATION */
  24         struct Library *, PartitionBase, 25, Partition)
  25
  26 /*  FUNCTION
  27         Read raw data from the partition.
  28
  29     INPUTS
  30         Partition  - a handle to a partition to read from
  31         Buffer     - a pointer to a data buffer
  32         DataSize   - Size of data to read in bytes. This size must be a
  33                      multiple of block size in order to ensure correct
  34                      operation
  35         StartBlock - Number of the first block to start reading from
  36
  37     RESULT
  38         Return code of DoIO() function which was used to read the data.
  39
  40     NOTES
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50 *****************************************************************************/
  51 {
  52     AROS_LIBFUNC_INIT
  53
  54     UQUAD offset = (getStartBlock(Partition) + StartBlock) * (Partition->de.de_SizeBlock << 2);
  55     struct IOExtTD *ioreq = Partition->bd->ioreq;
  56
  57     ioreq->iotd_Req.io_Command = Partition->bd->cmdread;
  58     ioreq->iotd_Req.io_Length  = DataSize;
  59     ioreq->iotd_Req.io_Data    = Buffer;
  60     ioreq->iotd_Req.io_Offset  = offset;
  61     ioreq->iotd_Req.io_Actual  = offset >> 32;
  62
  63     return DoIO((struct IORequest *)ioreq);
  64
  65     AROS_LIBFUNC_EXIT
  66 }