| 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_fast(iid, EHANGUP, 0, 0); |
| return; |
| } else { |
| /* |
| * Answer the first IPC_M_CONNECT_ME_TO call. |
| * Return supported block size as ARG1. |
| */ |
| ipc_answer_fast(iid, EOK, BLOCK_SIZE, 0); |
| } |
| |
| /* |
| * Now we wait for the client to send us its communication as_area. |
| */ |
| callid = async_get_call(&call); |
| if (IPC_GET_METHOD(call) == IPC_M_AS_AREA_SEND) { |
| if (IPC_GET_ARG1(call) >= (ipcarg_t) BLOCK_SIZE) { |
| /* |
| * The client sends an as_area that can absorb the whole |
| * block. |
| */ |
| ipc_answer_fast(callid, EOK, (uintptr_t) fs_va, 0); |
| } else { |
| /* |
| * The client offered as_area too small. |
| * Close the connection. |
| */ |
| ipc_answer_fast(callid, EHANGUP, 0, 0); |
| return; |
| } |
| } else { |
| /* |
| * The client doesn't speak the same protocol. |
| * At this point we can't handle protocol variations. |
| * Close the connection. |
| */ |
| ipc_answer_fast(callid, EHANGUP, 0, 0); |
| 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 pseudo thread. |
| */ |
| ipc_answer_fast(callid, EOK, 0, 0); |
| 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_fast(callid, retval, 0, 0); |
| } |
| } |
| |
| /** 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, &phonead) != 0) |
| return -1; |
| |
| async_manager(); |
| |
| /* Never reached */ |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| /** |
| * @} |
| */ |