rom/partition/readpartitiondata.c

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