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1999 decky 1
/*
2445 decky 2
 * Copyright (c) 2007 Michal Konopa
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 * Copyright (c) 2007 Martin Jelen
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 * Copyright (c) 2007 Peter Majer
2475 jermar 5
 * Copyright (c) 2007 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup rd
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 * @{
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 */
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/**
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 * @file    rd.c
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 * @brief   Initial RAM disk for HelenOS.
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 */
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <ipc/ns.h>
2005 decky 44
#include <sysinfo.h>
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#include <as.h>
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#include <ddi.h>
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#include <align.h>
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#include <bool.h>
1999 decky 49
#include <errno.h>
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#include <async.h>
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#include <align.h>
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#include <async.h>
2475 jermar 53
#include <futex.h>
3085 decky 54
#include <stdio.h>
4401 svoboda 55
#include <devmap.h>
4400 svoboda 56
#include <ipc/bd.h>
1999 decky 57
 
3085 decky 58
#define NAME "rd"
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2475 jermar 60
/** Pointer to the ramdisk's image. */
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static void *rd_addr;
2478 jermar 62
/** Size of the ramdisk. */
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static size_t rd_size;
1999 decky 64
 
2475 jermar 65
/**
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 * This futex protects the ramdisk's data.
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 * If we were to serve multiple requests (read + write or several writes)
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 * concurrently (i.e. from two or more threads), each read and write needs to be
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 * protected by this futex.
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 */
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atomic_t rd_futex = FUTEX_INITIALIZER;
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/** Handle one connection to ramdisk.
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 *
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 * @param iid       Hash of the request that opened the connection.
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 * @param icall     Call data of the request that opened the connection.
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 */
1999 decky 78
static void rd_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
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    ipc_callid_t callid;
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    ipc_call_t call;
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    int retval;
2478 jermar 83
    void *fs_va = NULL;
3254 jermar 84
    off_t offset;
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    size_t block_size;
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    size_t maxblock_size;
1999 decky 87
 
2475 jermar 88
    /*
3254 jermar 89
     * Answer the first IPC_M_CONNECT_ME_TO call.
2475 jermar 90
     */
3254 jermar 91
    ipc_answer_0(iid, EOK);
2475 jermar 92
 
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    /*
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     * Now we wait for the client to send us its communication as_area.
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     */
3085 decky 96
    int flags;
3254 jermar 97
    if (ipc_share_out_receive(&callid, &maxblock_size, &flags)) {
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        fs_va = as_get_mappable_page(maxblock_size);
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        if (fs_va) {
2678 jermar 100
            (void) ipc_share_out_finalize(callid, fs_va);
2475 jermar 101
        } else {
2619 jermar 102
            ipc_answer_0(callid, EHANGUP);
2475 jermar 103
            return;    
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        }
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    } else {
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        /*
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         * The client doesn't speak the same protocol.
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         * At this point we can't handle protocol variations.
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         * Close the connection.
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         */
2619 jermar 111
        ipc_answer_0(callid, EHANGUP);
2475 jermar 112
        return;
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    }
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4416 decky 115
    while (true) {
1999 decky 116
        callid = async_get_call(&call);
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        switch (IPC_GET_METHOD(call)) {
2471 jermar 118
        case IPC_M_PHONE_HUNGUP:
2475 jermar 119
            /*
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             * The other side has hung up.
2518 jermar 121
             * Answer the message and exit the fibril.
2475 jermar 122
             */
2619 jermar 123
            ipc_answer_0(callid, EOK);
2471 jermar 124
            return;
4400 svoboda 125
        case BD_READ_BLOCK:
2471 jermar 126
            offset = IPC_GET_ARG1(call);
3254 jermar 127
            block_size = IPC_GET_ARG2(call);
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            if (block_size > maxblock_size) {
2478 jermar 129
                /*
3254 jermar 130
                 * Maximum block size exceeded.
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                 */
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                retval = ELIMIT;
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                break;
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            }
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            if (offset * block_size > rd_size - block_size) {
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                /*
2478 jermar 137
                 * Reading past the end of the device.
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                 */
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                retval = ELIMIT;
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                break;
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            }
2475 jermar 142
            futex_down(&rd_futex);
3254 jermar 143
            memcpy(fs_va, rd_addr + offset * block_size, block_size);
2475 jermar 144
            futex_up(&rd_futex);
2471 jermar 145
            retval = EOK;
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            break;
4400 svoboda 147
        case BD_WRITE_BLOCK:
2475 jermar 148
            offset = IPC_GET_ARG1(call);
3254 jermar 149
            block_size = IPC_GET_ARG2(call);
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            if (block_size > maxblock_size) {
2478 jermar 151
                /*
3254 jermar 152
                 * Maximum block size exceeded.
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                 */
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                retval = ELIMIT;
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                break;
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            }
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            if (offset * block_size > rd_size - block_size) {
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                /*
2478 jermar 159
                 * Writing past the end of the device.
160
                 */
161
                retval = ELIMIT;
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                break;
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            }
2475 jermar 164
            futex_up(&rd_futex);
3254 jermar 165
            memcpy(rd_addr + offset * block_size, fs_va, block_size);
2475 jermar 166
            futex_down(&rd_futex);
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            retval = EOK;
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            break;
2471 jermar 169
        default:
2475 jermar 170
            /*
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             * The client doesn't speak the same protocol.
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             * Instead of closing the connection, we just ignore
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             * the call. This can be useful if the client uses a
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             * newer version of the protocol.
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             */
2471 jermar 176
            retval = EINVAL;
2475 jermar 177
            break;
1999 decky 178
        }
2619 jermar 179
        ipc_answer_0(callid, retval);
2471 jermar 180
    }
1999 decky 181
}
182
 
2475 jermar 183
/** Prepare the ramdisk image for operation. */
2005 decky 184
static bool rd_init(void)
1999 decky 185
{
2478 jermar 186
    rd_size = sysinfo_value("rd.size");
2471 jermar 187
    void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical");
1999 decky 188
 
3085 decky 189
    if (rd_size == 0) {
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        printf(NAME ": No RAM disk found\n");
2005 decky 191
        return false;
3085 decky 192
    }
1999 decky 193
 
2445 decky 194
    rd_addr = as_get_mappable_page(rd_size);
2005 decky 195
 
3085 decky 196
    int flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE;
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    int retval = physmem_map(rd_ph_addr, rd_addr,
2471 jermar 198
        ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags);
3908 decky 199
 
3085 decky 200
    if (retval < 0) {
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        printf(NAME ": Error mapping RAM disk\n");
2445 decky 202
        return false;
3085 decky 203
    }
204
 
205
    printf(NAME ": Found RAM disk at %p, %d bytes\n", rd_ph_addr, rd_size);
206
 
4416 decky 207
    int rc = devmap_driver_register(NAME, rd_connection);
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    if (rc < 0) {
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        printf(NAME ": Unable to register driver (%d)\n", rc);
3085 decky 210
        return false;
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    }
212
 
4410 svoboda 213
    dev_handle_t dev_handle;
4416 decky 214
    if (devmap_device_register("initrd", &dev_handle) != EOK) {
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        devmap_hangup_phone(DEVMAP_DRIVER);
3085 decky 216
        printf(NAME ": Unable to register device\n");
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        return false;
218
    }
219
 
2005 decky 220
    return true;
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}
1999 decky 222
 
2005 decky 223
int main(int argc, char **argv)
224
{
3085 decky 225
    printf(NAME ": HelenOS RAM disk server\n");
2005 decky 226
 
3085 decky 227
    if (!rd_init())
228
        return -1;
229
 
230
    printf(NAME ": Accepting connections\n");
231
    async_manager();
232
 
233
    /* Never reached */
234
    return 0;
1999 decky 235
}
236
 
237
/**
238
 * @}
4416 decky 239
 */