/*
* 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)
/*
* Bits used in call hashes.
* The addresses are aligned at least to 4 that is why we can use the 2 least
* significant bits of the call address.
*/
/** Type of this call is 'answer' */
#define IPC_CALLID_ANSWERED 1
/** Type of this call is 'notification' */
#define IPC_CALLID_NOTIFICATION 2
/* Return values from sys_ipc_call_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_CONNECT_TO_ME
* - 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 side) 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 - source as_area base address
* - ARG2 - size of source as_area (filled automatically by kernel)
* - ARG3 - flags of the as_area being sent
*
* on answer, the recipient must set:
* - ARG1 - dst as_area base adress
*/
#define IPC_M_AS_AREA_SEND 4
/** Receive as_area over IPC.
* - ARG1 - destination as_area base address
* - ARG2 - destination as_area size
* - ARG3 - user defined argument
*
* on answer, the recipient must set:
*
* - ARG1 - source as_area base address
* - ARG2 - flags that will be used for sharing
*/
#define IPC_M_AS_AREA_RECV 5
/** Send data to another address space over IPC.
* - ARG1 - destination address space virtual address, may be overriden by the
* recipient
* - ARG2 - source address space virtual address
* - ARG3 - size of data to be copied, may be overriden by the recipient
*
* on answer, the recipient must set:
*
* - ARG1 - final destination address space virtual address
* - ARG3 - final size of data to be copied
*/
#define IPC_M_DATA_SEND 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;
/** Buffer for IPC_M_DATA_SEND. */
uint8_t *buffer;
} 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);
extern void ipc_cleanup(void);
extern 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);
extern answerbox_t *ipc_phone_0;
#endif
#endif
/** @}
*/