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  1. /*
  2.  * Copyright (c) 2006 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericmm
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   RAM disk support.
  36.  *
  37.  * Support for RAM disk images.
  38.  */
  39.  
  40. #include <lib/rd.h>
  41. #include <byteorder.h>
  42. #include <mm/frame.h>
  43. #include <sysinfo/sysinfo.h>
  44. #include <ddi/ddi.h>
  45. #include <align.h>
  46.  
  47. static parea_t rd_parea;        /**< Physical memory area for rd. */
  48.  
  49. /**
  50.  * RAM disk initialization routine. At this point, the RAM disk memory is shared
  51.  * and information about the share is provided as sysinfo values to the userspace
  52.  * tasks.
  53.  */  
  54. int init_rd(rd_header_t *header, size_t size)
  55. {
  56.     /* Identify RAM disk */
  57.     if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
  58.         (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
  59.         return RE_INVALID;
  60.    
  61.     /* Identify version */ 
  62.     if (header->version != RD_VERSION)
  63.         return RE_UNSUPPORTED;
  64.    
  65.     uint32_t hsize;
  66.     uint64_t dsize;
  67.     switch (header->data_type) {
  68.     case RD_DATA_LSB:
  69.         hsize = uint32_t_le2host(header->header_size);
  70.         dsize = uint64_t_le2host(header->data_size);
  71.         break;
  72.     case RD_DATA_MSB:
  73.         hsize = uint32_t_be2host(header->header_size);
  74.         dsize = uint64_t_be2host(header->data_size);
  75.         break;
  76.     default:
  77.         return RE_UNSUPPORTED;
  78.     }
  79.    
  80.     if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
  81.         return RE_UNSUPPORTED;
  82.        
  83.     if (hsize > size)
  84.         return RE_INVALID;
  85.    
  86.     if ((uint64_t) hsize + dsize > size)
  87.         dsize = size - hsize;
  88.    
  89.     rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize), FRAME_SIZE);
  90.     rd_parea.vbase = (uintptr_t) ((void *) header + hsize);
  91.     rd_parea.frames = SIZE2FRAMES(dsize);
  92.     rd_parea.cacheable = true;
  93.     ddi_parea_register(&rd_parea);
  94.  
  95.     sysinfo_set_item_val("rd", NULL, true);
  96.     sysinfo_set_item_val("rd.header_size", NULL, hsize);   
  97.     sysinfo_set_item_val("rd.size", NULL, dsize);
  98.     sysinfo_set_item_val("rd.address.physical", NULL, (unative_t)
  99.         KA2PA((void *) header + hsize));
  100.  
  101.     return RE_OK;
  102. }
  103.  
  104. /** @}
  105.  */
  106.