/************************************************************************************
 * FILE PURPOSE: Boot a binary blob
 ************************************************************************************
 * FILE NAME: blob.c
 *
 * DESCRIPTION: A binary blob is booted.
 *
 * @file blob.c
 *
 * @brief
 *   This file reads data from the boot device as a binary blob
 *
 ************************************************************************************/
#include "types.h"
#include "ibl.h"
#include "iblloc.h"
#include "iblblob.h"



/**
 * @b Description
 * @n
 *
 * A simple read from the boot device is done until one of the following
 * conditions occurs:
 *    - The complete data block is read
 *    - The read request fails
 */

void iblBootBlob (BOOT_MODULE_FXN_TABLE *bootFxn, Uint32 *entry, void *formatParams)
{
    Int32   dataSize;
    Uint32  remainSize;
    Uint32  dummyVal;
    Uint32  bytesRead    = 0;
    Int32   erVal        = 0;
    Uint8  *datap;

    iblBinBlob_t *blobParams = (iblBinBlob_t *)formatParams;

    datap  = (Uint8 *)blobParams->startAddress;
    *entry = 0;

    for (remainSize = blobParams->sizeBytes; (remainSize > 0) && (erVal == 0);   )  {

        /* If there is any data waiting go ahead and process it */
        dataSize = (*bootFxn->query)();

        /* The query function will return a negative value when the stream has
         * closed */
        if (dataSize < 0)
            break;

        if (dataSize > remainSize)
            dataSize = remainSize;

        if (dataSize > 0)  {

            (*bootFxn->read)(datap, dataSize);
            datap      = datap      + dataSize;
            remainSize = remainSize - dataSize;
            bytesRead  = bytesRead  + dataSize;

        }  else  {

            /* If there is no data waiting peek for more. On error assume
             * that the device has completed the transfer. This is valid
             * since the read includes a timeout. */
            erVal = (*bootFxn->peek)((Uint8 *)&dummyVal, 1);

        }

    }

   /* Assume that if any data was read the boot was successful. 
    * A check could be added to see if the entry address was
    * actually written, but this assumes there was no data already
    * at the entry point */
   if (bytesRead > 0)
      *entry = blobParams->branchAddress;

}