0,0 → 1,228 |
/* |
* Copyright (c) 2007 Michal Konopa |
* Copyright (c) 2007 Martin Jelen |
* Copyright (c) 2007 Peter Majer |
* Copyright (c) 2007 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup rd |
* @{ |
*/ |
|
/** |
* @file rd.c |
* @brief Initial RAM disk for HelenOS. |
*/ |
|
#include <ipc/ipc.h> |
#include <ipc/services.h> |
#include <ipc/ns.h> |
#include <sysinfo.h> |
#include <as.h> |
#include <ddi.h> |
#include <align.h> |
#include <bool.h> |
#include <errno.h> |
#include <async.h> |
#include <align.h> |
#include <async.h> |
#include <futex.h> |
#include "rd.h" |
|
/** Pointer to the ramdisk's image. */ |
static void *rd_addr; |
/** Size of the ramdisk. */ |
static size_t rd_size; |
|
/** |
* This futex protects the ramdisk's data. |
* If we were to serve multiple requests (read + write or several writes) |
* concurrently (i.e. from two or more threads), each read and write needs to be |
* protected by this futex. |
*/ |
atomic_t rd_futex = FUTEX_INITIALIZER; |
|
/** Handle one connection to ramdisk. |
* |
* @param iid Hash of the request that opened the connection. |
* @param icall Call data of the request that opened the connection. |
*/ |
static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) |
{ |
ipc_callid_t callid; |
ipc_call_t call; |
int retval; |
void *fs_va = NULL; |
ipcarg_t offset; |
|
/* |
* We allocate VA for communication per connection. |
* This allows us to potentionally have more clients and work |
* concurrently. |
*/ |
fs_va = as_get_mappable_page(ALIGN_UP(BLOCK_SIZE, PAGE_SIZE)); |
if (!fs_va) { |
/* |
* Hang up the phone if we cannot proceed any further. |
* This is the answer to the call that opened the connection. |
*/ |
ipc_answer_0(iid, EHANGUP); |
return; |
} else { |
/* |
* Answer the first IPC_M_CONNECT_ME_TO call. |
* Return supported block size as ARG1. |
*/ |
ipc_answer_1(iid, EOK, BLOCK_SIZE); |
} |
|
/* |
* Now we wait for the client to send us its communication as_area. |
*/ |
size_t size; |
if (ipc_share_out_receive(&callid, &size, NULL)) { |
if (size >= BLOCK_SIZE) { |
/* |
* The client sends an as_area that can absorb the whole |
* block. |
*/ |
(void) ipc_share_out_finalize(callid, fs_va); |
} else { |
/* |
* The client offered as_area too small. |
* Close the connection. |
*/ |
ipc_answer_0(callid, EHANGUP); |
return; |
} |
} else { |
/* |
* The client doesn't speak the same protocol. |
* At this point we can't handle protocol variations. |
* Close the connection. |
*/ |
ipc_answer_0(callid, EHANGUP); |
return; |
} |
|
while (1) { |
callid = async_get_call(&call); |
switch (IPC_GET_METHOD(call)) { |
case IPC_M_PHONE_HUNGUP: |
/* |
* The other side has hung up. |
* Answer the message and exit the fibril. |
*/ |
ipc_answer_0(callid, EOK); |
return; |
case RD_READ_BLOCK: |
offset = IPC_GET_ARG1(call); |
if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) { |
/* |
* Reading past the end of the device. |
*/ |
retval = ELIMIT; |
break; |
} |
futex_down(&rd_futex); |
memcpy(fs_va, rd_addr + offset, BLOCK_SIZE); |
futex_up(&rd_futex); |
retval = EOK; |
break; |
case RD_WRITE_BLOCK: |
offset = IPC_GET_ARG1(call); |
if (offset * BLOCK_SIZE > rd_size - BLOCK_SIZE) { |
/* |
* Writing past the end of the device. |
*/ |
retval = ELIMIT; |
break; |
} |
futex_up(&rd_futex); |
memcpy(rd_addr + offset, fs_va, BLOCK_SIZE); |
futex_down(&rd_futex); |
retval = EOK; |
break; |
default: |
/* |
* The client doesn't speak the same protocol. |
* Instead of closing the connection, we just ignore |
* the call. This can be useful if the client uses a |
* newer version of the protocol. |
*/ |
retval = EINVAL; |
break; |
} |
ipc_answer_0(callid, retval); |
} |
} |
|
/** Prepare the ramdisk image for operation. */ |
static bool rd_init(void) |
{ |
int retval, flags; |
|
rd_size = sysinfo_value("rd.size"); |
void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical"); |
|
if (rd_size == 0) |
return false; |
|
rd_addr = as_get_mappable_page(rd_size); |
|
flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE; |
retval = physmem_map(rd_ph_addr, rd_addr, |
ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); |
|
if (retval < 0) |
return false; |
return true; |
} |
|
int main(int argc, char **argv) |
{ |
if (rd_init()) { |
ipcarg_t phonead; |
|
async_set_client_connection(rd_connection); |
|
/* Register service at nameserver */ |
if (ipc_connect_to_me(PHONE_NS, SERVICE_RD, 0, 0, &phonead) != 0) |
return -1; |
|
async_manager(); |
|
/* Never reached */ |
return 0; |
} |
|
return -1; |
} |
|
/** |
* @} |
*/ |