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  1. /*
  2.  * Copyright (c) 2007 Michal Konopa
  3.  * Copyright (c) 2007 Martin Jelen
  4.  * Copyright (c) 2007 Peter Majer
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  *
  11.  * - Redistributions of source code must retain the above copyright
  12.  *   notice, this list of conditions and the following disclaimer.
  13.  * - Redistributions in binary form must reproduce the above copyright
  14.  *   notice, this list of conditions and the following disclaimer in the
  15.  *   documentation and/or other materials provided with the distribution.
  16.  * - The name of the author may not be used to endorse or promote products
  17.  *   derived from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /** @addtogroup rd
  32.  * @{
  33.  */
  34.  
  35. /**
  36.  * @file    rd.c
  37.  * @brief   Initial RAM disk for HelenOS.
  38.  */
  39.  
  40. #include <ipc/ipc.h>
  41. #include <ipc/services.h>
  42. #include <ipc/ns.h>
  43. #include <sysinfo.h>
  44. #include <as.h>
  45. #include <ddi.h>
  46. #include <align.h>
  47. #include <bool.h>
  48. #include <errno.h>
  49. #include <async.h>
  50. #include <stdlib.h>
  51. #include <unistd.h>
  52. #include <align.h>
  53. #include <async.h>
  54. #include <ddi.h>
  55. #include <libarch/ddi.h>
  56. #include <stdio.h>
  57. #include "rd.h"
  58.  
  59. static void *rd_addr;
  60. static void *fs_addr;
  61.  
  62. static void rd_connection(ipc_callid_t iid, ipc_call_t *icall)
  63. {
  64.     ipc_callid_t callid;
  65.     ipc_call_t call;
  66.     int retval;
  67.  
  68.     ipc_answer_fast(iid, 0, 0, 0);
  69.     ipcarg_t offset;
  70.  
  71.     while (1) {
  72.         callid = async_get_call(&call);
  73.         switch (IPC_GET_METHOD(call)) {
  74.             case IPC_M_PHONE_HUNGUP:
  75.                 ipc_answer_fast(callid, 0,0,0);
  76.                 return;
  77.             case IPC_M_AS_AREA_SEND:
  78.                 ipc_answer_fast(callid, 0, (uintptr_t)fs_addr, 0);
  79.                 continue;
  80.             case RD_READ_BLOCK:        
  81.                 offset = IPC_GET_ARG1(call);
  82.                 memcpy((void *)fs_addr, rd_addr+offset, BLOCK_SIZE);
  83.                 retval = EOK;
  84.                 break;
  85.             default:
  86.                 retval = EINVAL;
  87.         }
  88.         ipc_answer_fast(callid, retval, 0, 0);
  89.     }  
  90. }
  91.  
  92.  
  93. static bool rd_init(void)
  94. {
  95.     int retval, flags;
  96.  
  97.     size_t rd_size = sysinfo_value("rd.size");
  98.     void * rd_ph_addr = (void *) sysinfo_value("rd.address.physical");
  99.    
  100.     if (rd_size == 0)
  101.         return false;
  102.    
  103.     rd_addr = as_get_mappable_page(rd_size);
  104.    
  105.     flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE;
  106.     retval = physmem_map(rd_ph_addr, rd_addr, ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags);
  107.  
  108.     if (retval < 0)
  109.         return false;
  110.    
  111.     size_t fs_size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE);
  112.     fs_addr = as_get_mappable_page(fs_size);
  113.  
  114.     return true;
  115. }
  116.  
  117. int main(int argc, char **argv)
  118. {
  119.     if (rd_init()) {
  120.         ipcarg_t phonead;
  121.        
  122.         async_set_client_connection(rd_connection);
  123.        
  124.         /* Register service at nameserver */
  125.         if (ipc_connect_to_me(PHONE_NS, SERVICE_RD, 0, &phonead) != 0)
  126.             return -1;
  127.        
  128.         async_manager();
  129.        
  130.         /* Never reached */
  131.         return 0;
  132.     }
  133.    
  134.     return -1;
  135. }
  136.  
  137. /**
  138.  * @}
  139.  */
  140.