0,0 → 1,271 |
/* |
* Copyright (c) 2006 Ondrej Palkovsky |
* 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 genericipc |
* @{ |
*/ |
/** @file |
*/ |
|
#ifndef KERN_IPC_H_ |
#define KERN_IPC_H_ |
|
/* Length of data being transfered with IPC call */ |
/* - the uspace may not be able to utilize full length */ |
#define IPC_CALL_LEN 4 |
|
/** Maximum active async calls per thread */ |
#ifdef CONFIG_DEBUG |
# define IPC_MAX_ASYNC_CALLS 4 |
#else |
# define IPC_MAX_ASYNC_CALLS 4000 |
#endif |
|
/* Flags for calls */ |
|
/** This is answer to a call */ |
#define IPC_CALL_ANSWERED (1 << 0) |
/** This call will not be freed on error */ |
#define IPC_CALL_STATIC_ALLOC (1 << 1) |
/** Answer will not be passed to userspace, will be discarded */ |
#define IPC_CALL_DISCARD_ANSWER (1 << 2) |
/** Call was forwarded */ |
#define IPC_CALL_FORWARDED (1 << 3) |
/** Identify connect_me_to answer */ |
#define IPC_CALL_CONN_ME_TO (1 << 4) |
/** Interrupt notification */ |
#define IPC_CALL_NOTIF (1 << 5) |
|
/* Flags of callid (the addresses are aligned at least to 4, |
* that is why we can use bottom 2 bits of the call address |
*/ |
/** Type of this msg is 'answer' */ |
#define IPC_CALLID_ANSWERED 1 |
/** Type of this msg is 'notification' */ |
#define IPC_CALLID_NOTIFICATION 2 |
|
/* Return values from IPC_ASYNC */ |
#define IPC_CALLRET_FATAL -1 |
#define IPC_CALLRET_TEMPORARY -2 |
|
|
/* Macros for manipulating calling data */ |
#define IPC_SET_RETVAL(data, retval) ((data).args[0] = (retval)) |
#define IPC_SET_METHOD(data, val) ((data).args[0] = (val)) |
#define IPC_SET_ARG1(data, val) ((data).args[1] = (val)) |
#define IPC_SET_ARG2(data, val) ((data).args[2] = (val)) |
#define IPC_SET_ARG3(data, val) ((data).args[3] = (val)) |
|
#define IPC_GET_METHOD(data) ((data).args[0]) |
#define IPC_GET_RETVAL(data) ((data).args[0]) |
|
#define IPC_GET_ARG1(data) ((data).args[1]) |
#define IPC_GET_ARG2(data) ((data).args[2]) |
#define IPC_GET_ARG3(data) ((data).args[3]) |
|
/* Well known phone descriptors */ |
#define PHONE_NS 0 |
|
/* System-specific methods - only through special syscalls |
* These methods have special behaviour |
*/ |
/** Protocol for CONNECT - TO - ME |
* |
* Calling process asks the callee to create a callback connection, |
* so that it can start initiating new messages. |
* |
* The protocol for negotiating is: |
* - sys_connect_to_me - sends a message IPC_M_CONNECTTOME |
* - sys_wait_for_call - upon receipt tries to allocate new phone |
* - if it fails, responds with ELIMIT |
* - passes call to userspace. If userspace |
* responds with error, phone is deallocated and |
* error is sent back to caller. Otherwise |
* the call is accepted and the response is sent back. |
* - the allocated phoneid is passed to userspace |
* (on the receiving sid) as ARG3 of the call. |
* - the caller obtains taskid of the called thread |
*/ |
#define IPC_M_CONNECT_TO_ME 1 |
/** Protocol for CONNECT - ME - TO |
* |
* Calling process asks the callee to create for him a new connection. |
* E.g. the caller wants a name server to connect him to print server. |
* |
* The protocol for negotiating is: |
* - sys_connect_me_to - send a synchronous message to name server |
* indicating that it wants to be connected to some |
* service |
* - arg1/2 are user specified, arg3 contains |
* address of the phone that should be connected |
* (TODO: it leaks to userspace) |
* recipient - if ipc_answer == 0, then accept connection |
* - otherwise connection refused |
* - recepient may forward message. Forwarding |
* system message |
* |
*/ |
#define IPC_M_CONNECT_ME_TO 2 |
/** This message is sent to answerbox when the phone |
* is hung up |
*/ |
#define IPC_M_PHONE_HUNGUP 3 |
|
/** Send as_area over IPC |
* - ARG1 - src as_area base address |
* - ARG2 - size of src as_area (filled automatically by kernel) |
* - ARG3 - flags of the as_area being sent |
* |
* on answer: |
* - ARG1 - dst as_area base adress |
*/ |
#define IPC_M_AS_AREA_SEND 5 |
|
/** Get as_area over IPC |
* - ARG1 - dst as_area base address |
* - ARG2 - dst as_area size |
* - ARG3 - user defined argument |
* |
* on answer, the server must set: |
* |
* - ARG1 - src as_area base address |
* - ARG2 - flags that will be used for sharing |
*/ |
#define IPC_M_AS_AREA_RECV 6 |
|
|
/* Well-known methods */ |
#define IPC_M_LAST_SYSTEM 511 |
#define IPC_M_PING 512 |
/* User methods */ |
#define FIRST_USER_METHOD 1024 |
|
#ifdef KERNEL |
|
#define IPC_MAX_PHONES 16 |
|
#include <synch/waitq.h> |
|
struct answerbox; |
struct task; |
|
typedef enum { |
/** Phone is free and can be allocated */ |
IPC_PHONE_FREE = 0, |
/** Phone is connecting somewhere */ |
IPC_PHONE_CONNECTING, |
/** Phone is connected */ |
IPC_PHONE_CONNECTED, |
/** Phone is hung up, waiting for answers to come */ |
IPC_PHONE_HUNGUP, |
/** Phone was hungup from server */ |
IPC_PHONE_SLAMMED |
} ipc_phone_state_t; |
|
/** Structure identifying phone (in TASK structure) */ |
typedef struct { |
SPINLOCK_DECLARE(lock); |
link_t link; |
struct answerbox *callee; |
ipc_phone_state_t state; |
atomic_t active_calls; |
} phone_t; |
|
typedef struct answerbox { |
SPINLOCK_DECLARE(lock); |
|
struct task *task; |
|
waitq_t wq; |
|
/** Phones connected to this answerbox */ |
link_t connected_phones; |
/** Received calls */ |
link_t calls; |
link_t dispatched_calls; /* Should be hash table in the future */ |
|
/** Answered calls */ |
link_t answers; |
|
SPINLOCK_DECLARE(irq_lock); |
/** Notifications from IRQ handlers */ |
link_t irq_notifs; |
/** IRQs with notifications to this answerbox. */ |
link_t irq_head; |
} answerbox_t; |
|
typedef struct { |
unative_t args[IPC_CALL_LEN]; |
phone_t *phone; |
} ipc_data_t; |
|
typedef struct { |
link_t link; |
|
int flags; |
|
/* Identification of the caller */ |
struct task *sender; |
/* The caller box is different from sender->answerbox |
* for synchronous calls |
*/ |
answerbox_t *callerbox; |
|
/** Private data to internal IPC */ |
unative_t priv; |
|
/** Data passed from/to userspace */ |
ipc_data_t data; |
} call_t; |
|
extern void ipc_init(void); |
extern call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags); |
extern void ipc_answer(answerbox_t *box, call_t *request); |
extern int ipc_call(phone_t *phone, call_t *call); |
extern void ipc_call_sync(phone_t *phone, call_t *request); |
extern void ipc_phone_init(phone_t *phone); |
extern void ipc_phone_connect(phone_t *phone, answerbox_t *box); |
extern void ipc_call_free(call_t *call); |
extern call_t * ipc_call_alloc(int flags); |
extern void ipc_answerbox_init(answerbox_t *box); |
extern void ipc_call_static_init(call_t *call); |
extern void task_print_list(void); |
extern int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox); |
void ipc_cleanup(void); |
int ipc_phone_hangup(phone_t *phone); |
extern void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err); |
extern void ipc_print_task(task_id_t taskid); |
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extern answerbox_t *ipc_phone_0; |
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#endif |
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#endif |
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/** @} |
*/ |