source: mainline/generic/include/ipc/ipc.h@ 8a0b0669

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 8a0b0669 was 9f52563, checked in by Jakub Jermar <jakub@…>, 19 years ago

Support for user space threads.
  • Property mode set to 100644
File size: 6.3 KB
Line 
1/*
2 * Copyright (C) 2006 Ondrej Palkovsky
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __IPC_H__
30#define __IPC_H__
31
32/* Length of data being transfered with IPC call */
33/* - the uspace may not be able to utilize full length */
34#define IPC_CALL_LEN 4
35
36/** Maximum active async calls per thread */
37#define IPC_MAX_ASYNC_CALLS 4
38
39/* Flags for calls */
40#define IPC_CALL_ANSWERED 0x1 /**< This is answer to a call */
41#define IPC_CALL_STATIC_ALLOC 0x2 /**< This call will not be freed on error */
42#define IPC_CALL_DISPATCHED 0x4 /**< Call is in dispatch queue */
43
44/* Flags for ipc_wait_for_call */
45#define IPC_WAIT_NONBLOCKING 1
46
47/* Flags of callid */
48#define IPC_CALLID_ANSWERED 1
49
50/* Return values from IPC_ASYNC */
51#define IPC_CALLRET_FATAL -1
52#define IPC_CALLRET_TEMPORARY -2
53
54
55/* Macros for manipulating calling data */
56#define IPC_SET_RETVAL(data, retval) ((data)[0] = (retval))
57#define IPC_SET_METHOD(data, val) ((data)[0] = (val))
58#define IPC_SET_ARG1(data, val) ((data)[1] = (val))
59#define IPC_SET_ARG2(data, val) ((data)[2] = (val))
60#define IPC_SET_ARG3(data, val) ((data)[3] = (val))
61
62#define IPC_GET_METHOD(data) ((data)[0])
63#define IPC_GET_RETVAL(data) ((data)[0])
64
65#define IPC_GET_ARG1(data) ((data)[1])
66#define IPC_GET_ARG2(data) ((data)[2])
67#define IPC_GET_ARG3(data) ((data)[3])
68
69/* Well known phone descriptors */
70#define PHONE_NS 0
71
72/* System-specific methods - only through special syscalls
73 * These methods have special behaviour
74 */
75/** Protocol for CONNECT - TO - ME
76 *
77 * Calling process asks the callee to create a callback connection,
78 * so that it can start initiating new messages.
79 *
80 * The protocol for negotiating is:
81 * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
82 * - sys_wait_for_call - upon receipt tries to allocate new phone
83 * - if it fails, responds with ELIMIT
84 * - passes call to userspace. If userspace
85 * responds with error, phone is deallocated and
86 * error is sent back to caller. Otherwise
87 * the call is accepted and the response is sent back.
88 * - the allocated phoneid is passed to userspace
89 * (on the receiving sid) as ARG3 of the call.
90 * - the caller obtains taskid of the called thread
91 */
92#define IPC_M_CONNECTTOME 1
93/** Protocol for CONNECT - ME - TO
94 *
95 * Calling process asks the callee to create for him a new connection.
96 * E.g. the caller wants a name server to connect him to print server.
97 *
98 * The protocol for negotiating is:
99 * - sys_connect_me_to - send a synchronous message to name server
100 * indicating that it wants to be connected to some
101 * service
102 * - arg1/2 are user specified, arg3 contains
103 * address of the phone that should be connected
104 * (TODO: it leaks to userspace)
105 * recepient - if ipc_answer == 0, then accept connection
106 * - otherwise connection refused
107 * - recepient may forward message. Forwarding
108 * system message
109 *
110 */
111#define IPC_M_CONNECTMETO 2
112/* Control messages that the server sends to the processes
113 * about their connections.
114 */
115
116
117/* Well-known methods */
118#define IPC_M_LAST_SYSTEM 511
119#define IPC_M_PING 512
120/* User methods */
121#define FIRST_USER_METHOD 1024
122
123#ifdef KERNEL
124
125#include <synch/mutex.h>
126#include <synch/condvar.h>
127#include <adt/list.h>
128
129#define IPC_MAX_PHONES 16
130
131typedef struct answerbox answerbox_t;
132typedef __native ipc_data_t[IPC_CALL_LEN];
133
134typedef struct {
135 link_t list;
136 answerbox_t *callerbox;
137 int flags;
138 task_t *sender;
139 ipc_data_t data;
140} call_t;
141
142struct answerbox {
143 SPINLOCK_DECLARE(lock);
144
145 task_t *task;
146
147 waitq_t wq;
148
149 link_t connected_phones; /**< Phones connected to this answerbox */
150 link_t calls; /**< Received calls */
151 link_t dispatched_calls; /* Should be hash table in the future */
152
153 link_t answers; /**< Answered calls */
154};
155
156typedef struct {
157 SPINLOCK_DECLARE(lock);
158 link_t list;
159 answerbox_t *callee;
160 int busy;
161} phone_t;
162
163extern void ipc_init(void);
164extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
165extern void ipc_answer(answerbox_t *box, call_t *request);
166extern void ipc_call(phone_t *phone, call_t *request);
167extern void ipc_call_sync(phone_t *phone, call_t *request);
168extern void ipc_phone_destroy(phone_t *phone);
169extern void ipc_phone_init(phone_t *phone);
170extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
171extern void ipc_call_free(call_t *call);
172extern call_t * ipc_call_alloc(void);
173extern void ipc_answerbox_init(answerbox_t *box);
174extern void ipc_call_init(call_t *call);
175extern void ipc_forward(call_t *call, answerbox_t *newbox,answerbox_t *oldbox);
176extern void task_print_list(void);
177
178extern answerbox_t *ipc_phone_0;
179
180#endif
181
182#endif
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