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1335 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1335 jermar 3
 * 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.
27
 */
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1740 jermar 29
/** @addtogroup ns
1649 cejka 30
 * @{
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 */
32
 
1335 jermar 33
/**
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 * @file    ns.c
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 * @brief   Naming service for HelenOS IPC.
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 */
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1649 cejka 38
 
1353 jermar 39
#include <ipc/ipc.h>
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#include <ipc/ns.h>
1596 palkovsky 41
#include <ipc/services.h>
1030 palkovsky 42
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
1335 jermar 46
#include <assert.h>
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#include <libadt/list.h>
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#include <libadt/hash_table.h>
1435 palkovsky 49
#include <sysinfo.h>
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#include <ddi.h>
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#include <as.h>
1335 jermar 52
 
53
#define NAME    "NS"
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55
#define NS_HASH_TABLE_CHAINS    20
56
 
1336 jermar 57
static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
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static int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid);
59
 
1335 jermar 60
/* Static functions implementing NS hash table operations. */
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static hash_index_t ns_hash(unsigned long *key);
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static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
1336 jermar 63
static void ns_remove(link_t *item);
1335 jermar 64
 
65
/** Operations for NS hash table. */
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static hash_table_operations_t ns_hash_table_ops = {
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    .hash = ns_hash,
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    .compare = ns_compare,
1336 jermar 69
    .remove_callback = ns_remove
1335 jermar 70
};
71
 
72
/** NS hash table structure. */
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static hash_table_t ns_hash_table;
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75
/** NS hash table item. */
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typedef struct {
77
    link_t link;
78
    ipcarg_t service;       /**< Number of the service. */
79
    ipcarg_t phone;         /**< Phone registered with the service. */
1336 jermar 80
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
1335 jermar 81
} hashed_service_t;
82
 
1596 palkovsky 83
static void *clockaddr = NULL;
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static void *klogaddr = NULL;
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2292 hudecek 86
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name, void **addr)
1435 palkovsky 87
{
88
    void *ph_addr;
89
 
1596 palkovsky 90
    if (!*addr) {
2015 jermar 91
        ph_addr = (void *) sysinfo_value(name);
1435 palkovsky 92
        if (!ph_addr) {
93
            ipc_answer_fast(callid, ENOENT, 0, 0);
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            return;
95
        }
2292 hudecek 96
        *addr = as_get_mappable_page(PAGE_SIZE);
2012 jermar 97
        physmem_map(ph_addr, *addr, 1, AS_AREA_READ | AS_AREA_CACHEABLE);
1435 palkovsky 98
    }
2012 jermar 99
    ipc_answer_fast(callid, 0, (ipcarg_t) *addr, AS_AREA_READ);
1435 palkovsky 100
}
101
 
1030 palkovsky 102
int main(int argc, char **argv)
103
{
104
    ipc_call_t call;
105
    ipc_callid_t callid;
106
 
1719 decky 107
    ipcarg_t retval;
1030 palkovsky 108
 
1336 jermar 109
    if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) {
1335 jermar 110
        return ENOMEM;
111
    }
1343 jermar 112
 
1030 palkovsky 113
    while (1) {
1365 jermar 114
        callid = ipc_wait_for_call(&call);
1091 palkovsky 115
        switch (IPC_GET_METHOD(call)) {
1435 palkovsky 116
        case IPC_M_AS_AREA_RECV:
1596 palkovsky 117
            switch (IPC_GET_ARG3(call)) {
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            case SERVICE_MEM_REALTIME:
2015 jermar 119
                get_as_area(callid, &call, "clock.faddr",
2292 hudecek 120
                    &clockaddr);
1596 palkovsky 121
                break;
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            case SERVICE_MEM_KLOG:
2015 jermar 123
                get_as_area(callid, &call, "klog.faddr",
2292 hudecek 124
                    &klogaddr);
1596 palkovsky 125
                break;
126
            default:
127
                ipc_answer_fast(callid, ENOENT, 0, 0);
128
            }
1435 palkovsky 129
            continue;
1089 palkovsky 130
        case IPC_M_PHONE_HUNGUP:
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            retval = 0;
132
            break;
1336 jermar 133
        case IPC_M_CONNECT_TO_ME:
1335 jermar 134
            /*
1336 jermar 135
             * Server requests service registration.
1335 jermar 136
             */
1336 jermar 137
            retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call);
1030 palkovsky 138
            break;
1089 palkovsky 139
        case IPC_M_CONNECT_ME_TO:
1336 jermar 140
            /*
141
             * Client requests to be connected to a service.
142
             */
143
            retval = connect_to_service(IPC_GET_ARG1(call), &call, callid);
1061 palkovsky 144
            break;
1030 palkovsky 145
        default:
146
            retval = ENOENT;
147
            break;
148
        }
1282 palkovsky 149
        if (! (callid & IPC_CALLID_NOTIFICATION)) {
1719 decky 150
            ipc_answer_fast(callid, retval, 0, 0);
1282 palkovsky 151
        }
1030 palkovsky 152
    }
153
}
1335 jermar 154
 
1338 jermar 155
/** Register service.
1336 jermar 156
 *
157
 * @param service Service to be registered.
158
 * @param phone phone Phone to be used for connections to the service.
159
 * @param call Pointer to call structure.
160
 *
161
 * @return Zero on success or a value from @ref errno.h.
162
 */
163
int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
164
{
165
    unsigned long keys[3] = { service, call->in_phone_hash, 0 };
166
    hashed_service_t *hs;
167
 
168
    if (hash_table_find(&ns_hash_table, keys)) {
169
        return EEXISTS;
170
    }
171
 
172
    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
173
    if (!hs) {
174
        return ENOMEM;
175
    }
176
 
177
    link_initialize(&hs->link);
178
    hs->service = service;
179
    hs->phone = phone;
180
    hs->in_phone_hash = call->in_phone_hash;
181
    hash_table_insert(&ns_hash_table, keys, &hs->link);
182
 
183
    return 0;
184
}
185
 
186
/** Connect client to service.
187
 *
188
 * @param service Service to be connected to.
189
 * @param call Pointer to call structure.
190
 * @param callid Call ID of the request.
191
 *
192
 * @return Zero on success or a value from @ref errno.h.
193
 */
194
int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
195
{
196
    unsigned long keys[3] = { service, 0, 0 };
197
    link_t *hlp;
198
    hashed_service_t *hs;
199
 
200
    hlp = hash_table_find(&ns_hash_table, keys);
201
    if (!hlp) {
202
        return ENOENT;
203
    }
204
    hs = hash_table_get_instance(hlp, hashed_service_t, link);
205
    return ipc_forward_fast(callid, hs->phone, 0, 0);
206
}
207
 
1335 jermar 208
/** Compute hash index into NS hash table.
209
 *
1336 jermar 210
 * @param key Pointer keys. However, only the first key (i.e. service number)
211
 *        is used to compute the hash index.
212
 * @return Hash index corresponding to key[0].
1335 jermar 213
 */
214
hash_index_t ns_hash(unsigned long *key)
215
{
216
    assert(key);
217
    return *key % NS_HASH_TABLE_CHAINS;
218
}
219
 
220
/** Compare a key with hashed item.
221
 *
1336 jermar 222
 * This compare function always ignores the third key.
223
 * It exists only to make it possible to remove records
224
 * originating from connection with key[1] in_phone_hash
225
 * value. Note that this is close to being classified
226
 * as a nasty hack.
227
 *
228
 * @param key Array of keys.
229
 * @param keys Must be lesser or equal to 3.
1335 jermar 230
 * @param item Pointer to a hash table item.
231
 * @return Non-zero if the key matches the item, zero otherwise.
232
 */
1336 jermar 233
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
1335 jermar 234
{
235
    hashed_service_t *hs;
236
 
237
    assert(key);
1336 jermar 238
    assert(keys <= 3);
1335 jermar 239
    assert(item);
240
 
241
    hs = hash_table_get_instance(item, hashed_service_t, link);
242
 
1336 jermar 243
    if (keys == 2)
244
        return key[1] == hs->in_phone_hash;
245
    else
246
        return key[0] == hs->service;
1335 jermar 247
}
1336 jermar 248
 
249
/** Perform actions after removal of item from the hash table.
250
 *
251
 * @param item Item that was removed from the hash table.
252
 */
253
void ns_remove(link_t *item)
254
{
255
    assert(item);
256
    free(hash_table_get_instance(item, hashed_service_t, link));
257
}
1719 decky 258
 
1649 cejka 259
/**
260
 * @}
261
 */