/*
* Copyright (C) 2005 Martin Decky
* 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.
*/
#include <syscall/syscall.h>
#include <proc/thread.h>
#include <mm/as.h>
#include <print.h>
#include <putchar.h>
#include <ipc/ipc.h>
#include <errno.h>
#include <proc/task.h>
#include <arch.h>
#include <debug.h>
static __native sys_ctl(void) {
thread_exit();
/* Unreachable */
return 0;
}
static __native sys_io(int fd, const void * buf, size_t count) {
// TODO: buf sanity checks and a lot of other stuff ...
size_t i;
for (i = 0; i < count; i++)
return count;
}
static phone_t * get_phone(__native phoneid)
{
phone_t *phone;
if (phoneid >= IPC_MAX_PHONES)
return NULL;
phone = &TASK->phones[phoneid];
if (!phone->callee)
return NULL;
return phone;
}
/** Send a call over IPC, wait for reply, return to user
*
* @return Call identification, returns -1 on fatal error,
-2 on 'Too many async request, handle answers first
*/
static __native sys_ipc_call_sync_fast(__native phoneid, __native method,
__native arg1, __native *data)
{
call_t call;
phone_t *phone;
/* Special answerbox for synchronous messages */
phone = get_phone(phoneid);
if (!phone)
return IPC_CALLRET_FATAL;
ipc_call_init(&call);
IPC_SET_METHOD(call.data, method);
IPC_SET_ARG1(call.data, arg1);
ipc_call_sync(phone, &call);
copy_to_uspace(data, &call.data, sizeof(call.data));
return 0;
}
/** Synchronous IPC call allowing to send whole message */
static __native sys_ipc_call_sync(__native phoneid, __native *data)
{
call_t call;
phone_t *phone;
/* Special answerbox for synchronous messages */
phone = get_phone(phoneid);
if (!phone)
return IPC_CALLRET_FATAL;
ipc_call_init(&call);
copy_from_uspace(&call.data, data, sizeof(call.data));
ipc_call_sync(phone, &call);
copy_to_uspace(data, &call.data, sizeof(call.data));
return 0;
}
/** Check that the task did not exceed allowed limit
*
* @return 0 - Limit OK, -1 - limit exceeded
*/
static int check_call_limit(void)
{
if (atomic_inc_post(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
atomic_dec(&TASK->active_calls);
return -1;
}
return 0;
}
/** Send an asynchronous call over ipc
*
* @return Call identification, returns -1 on fatal error,
-2 on 'Too many async request, handle answers first
*/
static __native sys_ipc_call_async_fast(__native phoneid, __native method,
__native arg1, __native arg2)
{
call_t *call;
phone_t *phone;
phone = get_phone(phoneid);
if (!phone)
return IPC_CALLRET_FATAL;
if (check_call_limit())
return IPC_CALLRET_TEMPORARY;
call = ipc_call_alloc();
IPC_SET_METHOD(call->data, method);
IPC_SET_ARG1(call->data, arg1);
IPC_SET_ARG2(call->data, arg2);
ipc_call(phone, call);
return (__native) call;
}
/** Synchronous IPC call allowing to send whole message
*
* @return The same as sys_ipc_call_async
*/
static __native sys_ipc_call_async(__native phoneid, __native *data)
{
call_t *call;
phone_t *phone;
phone = get_phone(phoneid);
if (!phone)
return IPC_CALLRET_FATAL;
if (check_call_limit())
return IPC_CALLRET_TEMPORARY;
call = ipc_call_alloc();
copy_from_uspace(&call->data, data, sizeof(call->data));
ipc_call(phone, call);
return (__native) call;
}
/** Send IPC answer */
static __native sys_ipc_answer(__native callid, __native retval, __native arg1,
__native arg2)
{
call_t *call;
/* Check that the user is not sending us answer callid */
ASSERT(! (callid & 1));
/* TODO: Check that the callid is in the dispatch table */
call = (call_t *) callid;
IPC_SET_RETVAL(call->data, retval);
IPC_SET_ARG1(call->data, arg1);
IPC_SET_ARG2(call->data, arg2);
ipc_answer(&TASK->answerbox, call);
return 0;
}
/** Wait for incoming ipc call or answer
*
* @param result
* @param flags
* @return Callid, if callid & 1, then the call is answer
*/
static __native sys_ipc_wait_for_call(__native *calldata, __native flags)
{
call_t *call;
call = ipc_wait_for_call(&TASK->answerbox, flags);
copy_to_uspace(calldata, &call->data, sizeof(call->data));
if (call->flags & IPC_CALL_ANSWERED) {
ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
ipc_call_free(call);
atomic_dec(&TASK->active_calls);
return ((__native)call) | IPC_CALLID_ANSWERED;
}
return (__native)call;
}
static __native sys_mremap(void *address, size_t size, unsigned long flags)
{
return as_remap(AS, (__address) address, size, 0);
}
syshandler_t syscall_table[SYSCALL_END] = {
sys_ctl,
sys_io,
sys_mremap,
sys_ipc_call_sync_fast,
sys_ipc_call_sync,
sys_ipc_call_async_fast,
sys_ipc_call_async,
sys_ipc_answer,
sys_ipc_wait_for_call
};