rom/partition/readpartitiondata.c

   1 /*
   2     Copyright © 1995-2014, 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 multiple of block size,
  33                      in order to ensure correct operation
  34         StartBlock - Number of the first block to start reading from.
  35
  36     RESULT
  37         A return code of DoIO() function which was used to read the data
  38
  39     NOTES
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46
  47     INTERNALS
  48
  49     HISTORY
  50
  51 *****************************************************************************/
  52 {
  53     AROS_LIBFUNC_INIT
  54
  55     UQUAD offset = (getStartBlock(Partition) + StartBlock) * (Partition->de.de_SizeBlock << 2);
  56     struct IOExtTD *ioreq = Partition->bd->ioreq;
  57
  58     ioreq->iotd_Req.io_Command = Partition->bd->cmdread;
  59     ioreq->iotd_Req.io_Length  = DataSize;
  60     ioreq->iotd_Req.io_Data    = Buffer;
  61     ioreq->iotd_Req.io_Offset  = offset;
  62     ioreq->iotd_Req.io_Actual  = offset >> 32;
  63
  64     return DoIO((struct IORequest *)ioreq);
  65
  66     AROS_LIBFUNC_EXIT
  67 }