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/*
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/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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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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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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 *
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 *
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 * - Redistributions of source code must retain the above copyright
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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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 *   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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 * - 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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 *   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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 *   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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 * - 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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 *   derived from this software without specific prior written permission.
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 *
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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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * (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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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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#ifndef __IPC_H__
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#ifndef __IPC_H__
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#define __IPC_H__
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#define __IPC_H__
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31
 
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/* Length of data being transfered with IPC call */
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/* Length of data being transfered with IPC call */
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/* - the uspace may not be able to utilize full length */
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/* - the uspace may not be able to utilize full length */
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#define IPC_CALL_LEN    4
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#define IPC_CALL_LEN    4
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35
 
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/** Maximum active async calls per thread */
36
/** Maximum active async calls per thread */
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#define IPC_MAX_ASYNC_CALLS  4
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#define IPC_MAX_ASYNC_CALLS  4
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38
 
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/* Flags for calls */
39
/* Flags for calls */
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#define IPC_CALL_ANSWERED       (1<<0) /**< This is answer to a call */
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#define IPC_CALL_ANSWERED       (1<<0) /**< This is answer to a call */
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#define IPC_CALL_STATIC_ALLOC   (1<<1) /**< This call will not be freed on error */
41
#define IPC_CALL_STATIC_ALLOC   (1<<1) /**< This call will not be freed on error */
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#define IPC_CALL_DISCARD_ANSWER (1<<2) /**< Answer will not be passed to
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#define IPC_CALL_DISCARD_ANSWER (1<<2) /**< Answer will not be passed to
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                    * userspace, will be discarded */
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                    * userspace, will be discarded */
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#define IPC_CALL_FORWARDED      (1<<3) /* Call was forwarded */
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#define IPC_CALL_FORWARDED      (1<<3) /* Call was forwarded */
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#define IPC_CALL_CONN_ME_TO     (1<<4) /* Identify connect_me_to */
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#define IPC_CALL_CONN_ME_TO     (1<<4) /* Identify connect_me_to */
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#define IPC_CALL_NOTIF          (1<<5) /* Interrupt notification */
46
#define IPC_CALL_NOTIF          (1<<5) /* Interrupt notification */
47
 
47
 
48
/* Flags for ipc_wait_for_call */
48
/* Flags for ipc_wait_for_call */
49
#define IPC_WAIT_NONBLOCKING   1
49
#define IPC_WAIT_NONBLOCKING   1
50
 
50
 
51
/* Flags of callid (the addresses are aligned at least to 4,
51
/* Flags of callid (the addresses are aligned at least to 4,
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 * that is why we can use bottom 2 bits of the call address
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 * that is why we can use bottom 2 bits of the call address
53
 */
53
 */
54
#define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
54
#define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
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#define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
55
#define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
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/* Return values from IPC_ASYNC */
57
/* Return values from IPC_ASYNC */
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#define IPC_CALLRET_FATAL         -1
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#define IPC_CALLRET_FATAL         -1
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#define IPC_CALLRET_TEMPORARY     -2
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#define IPC_CALLRET_TEMPORARY     -2
60
 
60
 
61
 
61
 
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/* Macros for manipulating calling data */
62
/* Macros for manipulating calling data */
63
#define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
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#define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
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#define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
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#define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
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#define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
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#define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
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#define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
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#define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
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#define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
67
#define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
68
 
68
 
69
#define IPC_GET_METHOD(data)           ((data).args[0])
69
#define IPC_GET_METHOD(data)           ((data).args[0])
70
#define IPC_GET_RETVAL(data)           ((data).args[0])
70
#define IPC_GET_RETVAL(data)           ((data).args[0])
71
 
71
 
72
#define IPC_GET_ARG1(data)              ((data).args[1])
72
#define IPC_GET_ARG1(data)              ((data).args[1])
73
#define IPC_GET_ARG2(data)              ((data).args[2])
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#define IPC_GET_ARG2(data)              ((data).args[2])
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#define IPC_GET_ARG3(data)              ((data).args[3])
74
#define IPC_GET_ARG3(data)              ((data).args[3])
75
 
75
 
76
/* Well known phone descriptors */
76
/* Well known phone descriptors */
77
#define PHONE_NS              0
77
#define PHONE_NS              0
78
 
78
 
79
/* System-specific methods - only through special syscalls
79
/* System-specific methods - only through special syscalls
80
 * These methods have special behaviour
80
 * These methods have special behaviour
81
 */
81
 */
82
/** Protocol for CONNECT - TO - ME
82
/** Protocol for CONNECT - TO - ME
83
 *
83
 *
84
 * Calling process asks the callee to create a callback connection,
84
 * Calling process asks the callee to create a callback connection,
85
 * so that it can start initiating new messages.
85
 * so that it can start initiating new messages.
86
 *
86
 *
87
 * The protocol for negotiating is:
87
 * The protocol for negotiating is:
88
 * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
88
 * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
89
 * - sys_wait_for_call - upon receipt tries to allocate new phone
89
 * - sys_wait_for_call - upon receipt tries to allocate new phone
90
 *                       - if it fails, responds with ELIMIT
90
 *                       - if it fails, responds with ELIMIT
91
 *                     - passes call to userspace. If userspace
91
 *                     - passes call to userspace. If userspace
92
 *                       responds with error, phone is deallocated and
92
 *                       responds with error, phone is deallocated and
93
 *                       error is sent back to caller. Otherwise
93
 *                       error is sent back to caller. Otherwise
94
 *                       the call is accepted and the response is sent back.
94
 *                       the call is accepted and the response is sent back.
95
 *                     - the allocated phoneid is passed to userspace
95
 *                     - the allocated phoneid is passed to userspace
96
 *                       (on the receiving sid) as ARG3 of the call.
96
 *                       (on the receiving sid) as ARG3 of the call.
97
 *                     - the caller obtains taskid of the called thread
97
 *                     - the caller obtains taskid of the called thread
98
 */
98
 */
99
#define IPC_M_CONNECT_TO_ME     1
99
#define IPC_M_CONNECT_TO_ME     1
100
/** Protocol for CONNECT - ME - TO
100
/** Protocol for CONNECT - ME - TO
101
 *
101
 *
102
 * Calling process asks the callee to create for him a new connection.
102
 * Calling process asks the callee to create for him a new connection.
103
 * E.g. the caller wants a name server to connect him to print server.
103
 * E.g. the caller wants a name server to connect him to print server.
104
 *
104
 *
105
 * The protocol for negotiating is:
105
 * The protocol for negotiating is:
106
 * - sys_connect_me_to - send a synchronous message to name server
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 * - sys_connect_me_to - send a synchronous message to name server
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 *                       indicating that it wants to be connected to some
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 *                       indicating that it wants to be connected to some
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 *                       service
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 *                       service
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 *                     - arg1/2 are user specified, arg3 contains
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 *                     - arg1/2 are user specified, arg3 contains
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 *                       address of the phone that should be connected
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 *                       address of the phone that should be connected
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 *                       (TODO: it leaks to userspace)
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 *                       (TODO: it leaks to userspace)
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 *   recepient         -  if ipc_answer == 0, then accept connection
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 *   recepient         -  if ipc_answer == 0, then accept connection
113
 *                     -  otherwise connection refused
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 *                     -  otherwise connection refused
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 *                     -  recepient may forward message. Forwarding
114
 *                     -  recepient may forward message. Forwarding
115
 *                        system message
115
 *                        system message
116
 *
116
 *
117
 */
117
 */
118
#define IPC_M_CONNECT_ME_TO     2
118
#define IPC_M_CONNECT_ME_TO     2
119
/** This message is sent to answerbox when the phone
119
/** This message is sent to answerbox when the phone
120
 * is hung up
120
 * is hung up
121
 */
121
 */
122
#define IPC_M_PHONE_HUNGUP      3
122
#define IPC_M_PHONE_HUNGUP      3
123
/** Interrupt notification */
123
/** Interrupt notification */
124
#define IPC_M_INTERRUPT         4
124
#define IPC_M_INTERRUPT         4
-
 
125
/** Send as_area over ipc
-
 
126
 * - ARG2 - src base address
-
 
127
 * - ARG3 - size of src as(filled automatically by kernel)
-
 
128
 * - on answer ARG1 - dst base adress
-
 
129
 */
-
 
130
#define IPC_M_AS_SEND           5
125
 
131
 
126
 
132
 
127
/* Well-known methods */
133
/* Well-known methods */
128
#define IPC_M_LAST_SYSTEM     511
134
#define IPC_M_LAST_SYSTEM     511
129
#define IPC_M_PING            512
135
#define IPC_M_PING            512
130
/* User methods */
136
/* User methods */
131
#define FIRST_USER_METHOD     1024
137
#define FIRST_USER_METHOD     1024
132
 
138
 
133
#ifdef KERNEL
139
#ifdef KERNEL
134
 
140
 
135
#include <synch/mutex.h>
141
#include <synch/mutex.h>
136
#include <synch/condvar.h>
142
#include <synch/condvar.h>
137
#include <adt/list.h>
143
#include <adt/list.h>
138
 
144
 
139
#define IPC_MAX_PHONES  16
145
#define IPC_MAX_PHONES  16
140
 
146
 
141
typedef struct answerbox_s answerbox_t;
147
typedef struct answerbox_s answerbox_t;
142
typedef struct phone_s phone_t;
148
typedef struct phone_s phone_t;
143
typedef struct {
149
typedef struct {
144
    __native args[IPC_CALL_LEN];
150
    __native args[IPC_CALL_LEN];
145
    phone_t *phone;
151
    phone_t *phone;
146
}ipc_data_t;
152
}ipc_data_t;
147
 
153
 
148
struct answerbox_s {
154
struct answerbox_s {
149
    SPINLOCK_DECLARE(lock);
155
    SPINLOCK_DECLARE(lock);
150
 
156
 
151
    task_t *task;
157
    task_t *task;
152
 
158
 
153
    waitq_t wq;
159
    waitq_t wq;
154
 
160
 
155
    link_t connected_phones; /**< Phones connected to this answerbox */
161
    link_t connected_phones; /**< Phones connected to this answerbox */
156
    link_t calls;            /**< Received calls */
162
    link_t calls;            /**< Received calls */
157
    link_t dispatched_calls; /* Should be hash table in the future */
163
    link_t dispatched_calls; /* Should be hash table in the future */
158
 
164
 
159
    link_t answers;          /**< Answered calls */
165
    link_t answers;          /**< Answered calls */
160
 
166
 
161
    SPINLOCK_DECLARE(irq_lock);
167
    SPINLOCK_DECLARE(irq_lock);
162
    link_t irq_notifs;       /**< Notifications from IRQ handlers */
168
    link_t irq_notifs;       /**< Notifications from IRQ handlers */
163
};
169
};
164
 
170
 
165
typedef enum {
171
typedef enum {
166
    IPC_BUSY_FREE = 0,
172
    IPC_BUSY_FREE = 0,
167
    IPC_BUSY_CONNECTING,
173
    IPC_BUSY_CONNECTING,
168
    IPC_BUSY_CONNECTED
174
    IPC_BUSY_CONNECTED
169
} ipc_busy_t;
175
} ipc_busy_t;
170
 
176
 
171
struct phone_s {
177
struct phone_s {
172
    SPINLOCK_DECLARE(lock);
178
    SPINLOCK_DECLARE(lock);
173
    link_t list;
179
    link_t list;
174
    answerbox_t *callee;
180
    answerbox_t *callee;
175
    ipc_busy_t busy;
181
    ipc_busy_t busy;
176
    atomic_t active_calls;
182
    atomic_t active_calls;
177
};
183
};
178
 
184
 
179
typedef struct {
185
typedef struct {
180
    link_t list;
186
    link_t list;
181
 
187
 
182
    int flags;
188
    int flags;
183
 
189
 
184
    /* Identification of the caller */
190
    /* Identification of the caller */
185
    task_t *sender;
191
    task_t *sender;
186
    /* The caller box is different from sender->answerbox
192
    /* The caller box is different from sender->answerbox
187
     * for synchronous calls
193
     * for synchronous calls
188
     */
194
     */
189
    answerbox_t *callerbox;
195
    answerbox_t *callerbox;
190
 
196
 
191
    __native private; /**< Private data to internal IPC */
197
    __native private; /**< Private data to internal IPC */
192
 
198
 
193
    ipc_data_t data;  /**< Data passed from/to userspace */
199
    ipc_data_t data;  /**< Data passed from/to userspace */
194
}call_t;
200
}call_t;
195
 
201
 
196
extern void ipc_init(void);
202
extern void ipc_init(void);
197
extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
203
extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
198
extern void ipc_answer(answerbox_t *box, call_t *request);
204
extern void ipc_answer(answerbox_t *box, call_t *request);
199
extern int ipc_call(phone_t *phone, call_t *call);
205
extern int ipc_call(phone_t *phone, call_t *call);
200
extern void ipc_call_sync(phone_t *phone, call_t *request);
206
extern void ipc_call_sync(phone_t *phone, call_t *request);
201
extern void ipc_phone_init(phone_t *phone);
207
extern void ipc_phone_init(phone_t *phone);
202
extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
208
extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
203
extern void ipc_call_free(call_t *call);
209
extern void ipc_call_free(call_t *call);
204
extern call_t * ipc_call_alloc(int flags);
210
extern call_t * ipc_call_alloc(int flags);
205
extern void ipc_answerbox_init(answerbox_t *box);
211
extern void ipc_answerbox_init(answerbox_t *box);
206
extern void ipc_call_static_init(call_t *call);
212
extern void ipc_call_static_init(call_t *call);
207
extern void task_print_list(void);
213
extern void task_print_list(void);
208
extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
214
extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
209
extern void ipc_cleanup(task_t *task);
215
extern void ipc_cleanup(task_t *task);
210
extern int ipc_phone_hangup(phone_t *phone);
216
extern int ipc_phone_hangup(phone_t *phone);
211
extern void ipc_backsend_err(phone_t *phone, call_t *call, __native err);
217
extern void ipc_backsend_err(phone_t *phone, call_t *call, __native err);
212
 
218
 
213
 
219
 
214
extern answerbox_t *ipc_phone_0;
220
extern answerbox_t *ipc_phone_0;
215
 
221
 
216
#endif
222
#endif
217
 
223
 
218
#endif
224
#endif
219
 
225