/*
* 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 kernel_generic_ipc
* @{
*/
/** @file
*/
#include <arch.h>
#include <assert.h>
#include <errno.h>
#include <memw.h>
#include <ipc/ipc.h>
#include <abi/ipc/methods.h>
#include <ipc/sysipc.h>
#include <ipc/sysipc_ops.h>
#include <ipc/sysipc_priv.h>
#include <ipc/irq.h>
#include <ipc/ipcrsc.h>
#include <ipc/event.h>
#include <ipc/kbox.h>
#include <synch/waitq.h>
#include <arch/interrupt.h>
#include <syscall/copy.h>
#include <security/perm.h>
#include <console/console.h>
#include <macros.h>
#include <cap/cap.h>
#define STRUCT_TO_USPACE(dst, src) copy_to_uspace((dst), (src), sizeof(*(src)))
/** Decide if the interface and method is a system method.
*
* @param imethod Interface and method to be decided.
*
* @return True if the interface and method is a system
* interface and method.
*
*/
static inline bool method_is_system(sysarg_t imethod)
{
if (imethod <= IPC_M_LAST_SYSTEM)
return true;
return false;
}
/** Decide if the message with this interface and method is forwardable.
*
* Some system messages may be forwarded, for some of them
* it is useless.
*
* @param imethod Interface and method to be decided.
*
* @return True if the interface and method is forwardable.
*
*/
static inline bool method_is_forwardable(sysarg_t imethod)
{
switch (imethod) {
case IPC_M_PHONE_HUNGUP:
/* This message is meant only for the original recipient. */
return false;
default:
return true;
}
}
/** Decide if the message with this interface and method is immutable on forward.
*
* Some system messages may be forwarded but their content cannot be altered.
*
* @param imethod Interface and method to be decided.
*
* @return True if the interface and method is immutable on forward.
*
*/
static inline bool method_is_immutable(sysarg_t imethod)
{
switch (imethod) {
case IPC_M_PAGE_IN:
case IPC_M_SHARE_OUT:
case IPC_M_SHARE_IN:
case IPC_M_DATA_WRITE:
case IPC_M_DATA_READ:
case IPC_M_STATE_CHANGE_AUTHORIZE:
return true;
default:
return false;
}
}
/*
* Functions that preprocess answer before sending it to the recepient.
*/
/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
* for answer_preprocess().
*
* @param call Call structure to be decided.
*
* @return true if the old call contents should be saved.
*
*/
static inline bool answer_need_old(call_t *call)
{
switch (ipc_get_imethod(&call->data)) {
case IPC_M_CONNECT_TO_ME:
case IPC_M_CONNECT_ME_TO:
case IPC_M_PAGE_IN:
case IPC_M_SHARE_OUT:
case IPC_M_SHARE_IN:
case IPC_M_DATA_WRITE:
case IPC_M_DATA_READ:
case IPC_M_STATE_CHANGE_AUTHORIZE:
return true;
default:
return false;
}
}
/** Interpret process answer as control information.
*
* This function is called directly after sys_ipc_answer().
*
* @param answer Call structure with the answer.
* @param olddata Saved data of the request.
*
* @return Return EOK on success or an error code.
*
*/
errno_t answer_preprocess(call_t *answer, ipc_data_t *olddata)
{
errno_t rc = EOK;
spinlock_lock(&answer->forget_lock);
if (answer->forget) {
/*
* This is a forgotten call and answer->sender is not valid.
*/
spinlock_unlock(&answer->forget_lock);
SYSIPC_OP(answer_cleanup, answer, olddata);
return rc;
} else {
assert(answer->active);
/*
* Mark the call as inactive to prevent _ipc_answer_free_call()
* from attempting to remove the call from the active list
* itself.
*/
answer->active = false;
/*
* Remove the call from the sender's active call list.
* We enforce this locking order so that any potential
* concurrently executing forget operation is forced to
* release its active_calls_lock and lose the race to
* forget this soon to be answered call.
*/
spinlock_lock(&answer->sender->active_calls_lock);
list_remove(&answer->ta_link);
spinlock_unlock(&answer->sender->active_calls_lock);
}
spinlock_unlock(&answer->forget_lock);
if ((errno_t) ipc_get_retval(&answer->data) == EHANGUP) {
phone_t *phone = answer->caller_phone;
mutex_lock(&phone->lock);
if (phone->state == IPC_PHONE_CONNECTED) {
irq_spinlock_lock(&phone->callee->lock, true);
list_remove(&phone->link);
/* Drop callee->connected_phones reference */
kobject_put(phone->kobject);
phone->state = IPC_PHONE_SLAMMED;
phone->label = 0;
irq_spinlock_unlock(&phone->callee->lock, true);
}
mutex_unlock(&phone->lock);
}
if (!olddata)
return rc;
return SYSIPC_OP(answer_preprocess, answer, olddata);
}
/** Called before the request is sent.
*
* @param call Call structure with the request.
* @param phone Phone that the call will be sent through.
*
* @return Return 0 on success, ELIMIT or EPERM on error.
*
*/
static errno_t request_preprocess(call_t *call, phone_t *phone)
{
call->request_method = ipc_get_imethod(&call->data);
return SYSIPC_OP(request_preprocess, call, phone);
}
/*
* Functions called to process received call/answer before passing it to uspace.
*/
/** Do basic kernel processing of received call answer.
*
* @param call Call structure with the answer.
*
*/
static void process_answer(call_t *call)
{
if (((errno_t) ipc_get_retval(&call->data) == EHANGUP) &&
(call->flags & IPC_CALL_FORWARDED))
ipc_set_retval(&call->data, EFORWARD);
SYSIPC_OP(answer_process, call);
}
/** Do basic kernel processing of received call request.
*
* @param box Destination answerbox structure.
* @param call Call structure with the request.
*
* @return 0 if the call should be passed to userspace.
* @return -1 if the call should be ignored.
*
*/
static int process_request(answerbox_t *box, call_t *call)
{
return SYSIPC_OP(request_process, call, box);
}
/** Make a call over IPC and wait for reply.
*
* @param handle Phone capability handle for the call.
* @param data[inout] Structure with request/reply data.
* @param priv Value to be stored in call->priv.
*
* @return EOK on success.
* @return ENOENT if there is no such phone handle.
* @return ENOMEM if not enough memory to make the call
*
*/
errno_t
ipc_req_internal(cap_phone_handle_t handle, ipc_data_t *data, sysarg_t priv)
{
kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE);
if (!kobj->phone)
return ENOENT;
call_t *call = ipc_call_alloc();
if (!call) {
kobject_put(kobj);
return ENOMEM;
}
call->priv = priv;
memcpy(call->data.args, data->args, sizeof(data->args));
errno_t rc = request_preprocess(call, kobj->phone);
if (!rc) {
#ifdef CONFIG_UDEBUG
udebug_stoppable_begin();
#endif
kobject_add_ref(call->kobject);
rc = ipc_call_sync(kobj->phone, call);
spinlock_lock(&call->forget_lock);
bool forgotten = call->forget;
spinlock_unlock(&call->forget_lock);
kobject_put(call->kobject);
#ifdef CONFIG_UDEBUG
udebug_stoppable_end();
#endif
if (rc != EOK) {
if (!forgotten) {
/*
* There was an error, but it did not result
* in the call being forgotten. In fact, the
* call was not even sent. We are still
* its owners and are responsible for its
* deallocation.
*/
kobject_put(call->kobject);
} else {
/*
* The call was forgotten and it changed hands.
* We are no longer expected to free it.
*/
assert(rc == EINTR);
}
kobject_put(kobj);
return rc;
}
process_answer(call);
} else
ipc_set_retval(&call->data, rc);
memcpy(data->args, call->data.args, sizeof(data->args));
kobject_put(call->kobject);
kobject_put(kobj);
return EOK;
}
/** Check that the task did not exceed the allowed limit of asynchronous calls
* made over a phone.
*
* @param phone Phone to check the limit against.
*
* @return 0 if limit not reached or -1 if limit exceeded.
*
*/
static int check_call_limit(phone_t *phone)
{
if (atomic_load(&phone->active_calls) >= IPC_MAX_ASYNC_CALLS)
return -1;
return 0;
}
/** Make a fast asynchronous call over IPC.
*
* This function can only handle three arguments of payload, but is faster than
* the generic function sys_ipc_call_async_slow().
*
* @param handle Phone capability handle for the call.
* @param imethod Interface and method of the call.
* @param arg1 Service-defined payload argument.
* @param arg2 Service-defined payload argument.
* @param arg3 Service-defined payload argument.
* @param label User-defined label.
*
* @return EOK on success.
* @return An error code on error.
*
*/
sys_errno_t sys_ipc_call_async_fast(cap_phone_handle_t handle, sysarg_t imethod,
sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t label)
{
kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE);
if (!kobj)
return ENOENT;
if (check_call_limit(kobj->phone)) {
kobject_put(kobj);
return ELIMIT;
}
call_t *call = ipc_call_alloc();
if (!call) {
kobject_put(kobj);
return ENOMEM;
}
ipc_set_imethod(&call->data, imethod);
ipc_set_arg1(&call->data, arg1);
ipc_set_arg2(&call->data, arg2);
ipc_set_arg3(&call->data, arg3);
/*
* To achieve deterministic behavior, zero out arguments that are beyond
* the limits of the fast version.
*/
ipc_set_arg5(&call->data, 0);
/* Set the user-defined label */
call->data.answer_label = label;
errno_t res = request_preprocess(call, kobj->phone);
if (!res)
ipc_call(kobj->phone, call);
else
ipc_backsend_err(kobj->phone, call, res);
kobject_put(kobj);
return EOK;
}
/** Make an asynchronous IPC call allowing to transmit the entire payload.
*
* @param handle Phone capability for the call.
* @param data Userspace address of call data with the request.
* @param label User-defined label.
*
* @return See sys_ipc_call_async_fast().
*
*/
sys_errno_t sys_ipc_call_async_slow(cap_phone_handle_t handle, uspace_ptr_ipc_data_t data,
sysarg_t label)
{
kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE);
if (!kobj)
return ENOENT;
if (check_call_limit(kobj->phone)) {
kobject_put(kobj);
return ELIMIT;
}
call_t *call = ipc_call_alloc();
if (!call) {
kobject_put(kobj);
return ENOMEM;
}
errno_t rc = copy_from_uspace(&call->data.args, data + offsetof(ipc_data_t, args),
sizeof(call->data.args));
if (rc != EOK) {
kobject_put(call->kobject);
kobject_put(kobj);
return (sys_errno_t) rc;
}
/* Set the user-defined label */
call->data.answer_label = label;
errno_t res = request_preprocess(call, kobj->phone);
if (!res)
ipc_call(kobj->phone, call);
else
ipc_backsend_err(kobj->phone, call, res);
kobject_put(kobj);
return EOK;
}
/** Forward a received call to another destination
*
* Common code for both the fast and the slow version.
*
* @param chandle Call handle of the forwarded call.
* @param phandle Phone handle to use for forwarding.
* @param imethod New interface and method to use for the forwarded call.
* @param arg1 New value of the first argument for the forwarded call.
* @param arg2 New value of the second argument for the forwarded call.
* @param arg3 New value of the third argument for the forwarded call.
* @param arg4 New value of the fourth argument for the forwarded call.
* @param arg5 New value of the fifth argument for the forwarded call.
* @param mode Flags that specify mode of the forward operation.
* @param slow If true, arg3, arg4 and arg5 are considered. Otherwise
* the function considers only the fast version arguments:
* i.e. arg1 and arg2.
*
* @return 0 on succes, otherwise an error code.
*
* Warning: Make sure that ARG5 is not rewritten for certain system IPC
*
*/
static sys_errno_t sys_ipc_forward_common(cap_call_handle_t chandle,
cap_phone_handle_t phandle, sysarg_t imethod, sysarg_t arg1, sysarg_t arg2,
sysarg_t arg3, sysarg_t arg4, sysarg_t arg5, unsigned int mode, bool slow)
{
kobject_t *ckobj = cap_unpublish(TASK, chandle, KOBJECT_TYPE_CALL);
if (!ckobj)
return ENOENT;
call_t *call = ckobj->call;
ipc_data_t old;
bool need_old = answer_need_old(call);
if (need_old)
old = call->data;
bool after_forward = false;
errno_t rc;
kobject_t *pkobj = kobject_get(TASK, phandle, KOBJECT_TYPE_PHONE);
if (!pkobj) {
rc = ENOENT;
goto error;
}
if (!method_is_forwardable(ipc_get_imethod(&call->data))) {
rc = EPERM;
goto error;
}
call->flags |= IPC_CALL_FORWARDED;
/*
* User space is not allowed to change interface and method of system
* methods on forward, allow changing ARG1, ARG2, ARG3 and ARG4 by
* means of imethod, arg1, arg2 and arg3.
* If the interface and method is immutable, don't change anything.
*/
if (!method_is_immutable(ipc_get_imethod(&call->data))) {
if (method_is_system(ipc_get_imethod(&call->data))) {
if (ipc_get_imethod(&call->data) ==
IPC_M_CONNECT_TO_ME) {
kobject_put((kobject_t *) call->priv);
call->priv = 0;
cap_free(TASK,
(cap_handle_t) ipc_get_arg5(&call->data));
}
ipc_set_arg1(&call->data, imethod);
ipc_set_arg2(&call->data, arg1);
ipc_set_arg3(&call->data, arg2);
if (slow)
ipc_set_arg4(&call->data, arg3);
/*
* For system methods we deliberately don't
* overwrite ARG5.
*/
} else {
ipc_set_imethod(&call->data, imethod);
ipc_set_arg1(&call->data, arg1);
ipc_set_arg2(&call->data, arg2);
if (slow) {
ipc_set_arg3(&call->data, arg3);
ipc_set_arg4(&call->data, arg4);
ipc_set_arg5(&call->data, arg5);
}
}
}
rc = ipc_forward(call, pkobj->phone, &TASK->answerbox, mode);
if (rc != EOK) {
after_forward = true;
goto error;
}
cap_free(TASK, chandle);
kobject_put(ckobj);
kobject_put(pkobj);
return EOK;
error:
ipc_set_retval(&call->data, EFORWARD);
(void) answer_preprocess(call, need_old ? &old : NULL);
if (after_forward)
_ipc_answer_free_call(call, false);
else
ipc_answer(&TASK->answerbox, call);
cap_free(TASK, chandle);
kobject_put(ckobj);
if (pkobj)
kobject_put(pkobj);
return rc;
}
/** Forward a received call to another destination - fast version.
*
* In case the original interface and method is a system method, ARG1, ARG2
* and ARG3 are overwritten in the forwarded message with the new method and
* the new arg1 and arg2, respectively. Otherwise the IMETHOD, ARG1 and ARG2
* are rewritten with the new interface and method, arg1 and arg2, respectively.
* Also note there is a set of immutable methods, for which the new method and
* arguments are not set and these values are ignored.
*
* @param chandle Call handle of the call to forward.
* @param phandle Phone handle to use for forwarding.
* @param imethod New interface and method to use for the forwarded call.
* @param arg1 New value of the first argument for the forwarded call.
* @param arg2 New value of the second argument for the forwarded call.
* @param mode Flags that specify mode of the forward operation.
*
* @return 0 on succes, otherwise an error code.
*
*/
sys_errno_t sys_ipc_forward_fast(cap_call_handle_t chandle,
cap_phone_handle_t phandle, sysarg_t imethod, sysarg_t arg1, sysarg_t arg2,
unsigned int mode)
{
return sys_ipc_forward_common(chandle, phandle, imethod, arg1, arg2, 0,
0, 0, mode, false);
}
/** Forward a received call to another destination - slow version.
*
* This function is the slow verision of the sys_ipc_forward_fast interface.
* It can copy all five new arguments and the new interface and method from
* the userspace. It naturally extends the functionality of the fast version.
* For system methods, it additionally stores the new value of arg3 to ARG4.
* For non-system methods, it additionally stores the new value of arg3, arg4
* and arg5, respectively, to ARG3, ARG4 and ARG5, respectively.
*
* @param chandle Call handle of the call to forward.
* @param phandle Phone handle to use for forwarding.
* @param data Userspace address of the new IPC data.
* @param mode Flags that specify mode of the forward operation.
*
* @return 0 on succes, otherwise an error code.
*
*/
sys_errno_t sys_ipc_forward_slow(cap_call_handle_t chandle,
cap_phone_handle_t phandle, uspace_ptr_ipc_data_t data, unsigned int mode)
{
ipc_data_t newdata;
errno_t rc = copy_from_uspace(&newdata.args, data + offsetof(ipc_data_t, args),
sizeof(newdata.args));
if (rc != EOK)
return (sys_errno_t) rc;
return sys_ipc_forward_common(chandle, phandle,
ipc_get_imethod(&newdata), ipc_get_arg1(&newdata),
ipc_get_arg2(&newdata), ipc_get_arg3(&newdata),
ipc_get_arg4(&newdata), ipc_get_arg5(&newdata), mode, true);
}
/** Answer an IPC call - fast version.
*
* This function can handle only two return arguments of payload, but is faster
* than the generic sys_ipc_answer().
*
* @param chandle Call handle to be answered.
* @param retval Return value of the answer.
* @param arg1 Service-defined return value.
* @param arg2 Service-defined return value.
* @param arg3 Service-defined return value.
* @param arg4 Service-defined return value.
*
* @return 0 on success, otherwise an error code.
*
*/
sys_errno_t sys_ipc_answer_fast(cap_call_handle_t chandle, sysarg_t retval,
sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t arg4)
{
kobject_t *kobj = cap_unpublish(TASK, chandle, KOBJECT_TYPE_CALL);
if (!kobj)
return ENOENT;
call_t *call = kobj->call;
assert(!(call->flags & IPC_CALL_ANSWERED));
ipc_data_t saved_data;
bool saved;
if (answer_need_old(call)) {
memcpy(&saved_data, &call->data, sizeof(call->data));
saved = true;
} else
saved = false;
ipc_set_retval(&call->data, retval);
ipc_set_arg1(&call->data, arg1);
ipc_set_arg2(&call->data, arg2);
ipc_set_arg3(&call->data, arg3);
ipc_set_arg4(&call->data, arg4);
/*
* To achieve deterministic behavior, zero out arguments that are beyond
* the limits of the fast version.
*/
ipc_set_arg5(&call->data, 0);
errno_t rc = answer_preprocess(call, saved ? &saved_data : NULL);
ipc_answer(&TASK->answerbox, call);
kobject_put(kobj);
cap_free(TASK, chandle);
return rc;
}
/** Answer an IPC call.
*
* @param chandle Call handle to be answered.
* @param data Userspace address of call data with the answer.
*
* @return 0 on success, otherwise an error code.
*
*/
sys_errno_t sys_ipc_answer_slow(cap_call_handle_t chandle, uspace_ptr_ipc_data_t data)
{
kobject_t *kobj = cap_unpublish(TASK, chandle, KOBJECT_TYPE_CALL);
if (!kobj)
return ENOENT;
call_t *call = kobj->call;
assert(!(call->flags & IPC_CALL_ANSWERED));
ipc_data_t saved_data;
bool saved;
if (answer_need_old(call)) {
memcpy(&saved_data, &call->data, sizeof(call->data));
saved = true;
} else
saved = false;
errno_t rc = copy_from_uspace(&call->data.args, data + offsetof(ipc_data_t, args),
sizeof(call->data.args));
if (rc != EOK) {
/*
* Republish the capability so that the call does not get lost.
*/
cap_publish(TASK, chandle, kobj);
return rc;
}
rc = answer_preprocess(call, saved ? &saved_data : NULL);
ipc_answer(&TASK->answerbox, call);
kobject_put(kobj);
cap_free(TASK, chandle);
return rc;
}
/** Hang up a phone.
*
* @param handle Phone capability handle of the phone to be hung up.
*
* @return 0 on success or an error code.
*
*/
sys_errno_t sys_ipc_hangup(cap_phone_handle_t handle)
{
kobject_t *kobj = cap_unpublish(TASK, handle, KOBJECT_TYPE_PHONE);
if (!kobj)
return ENOENT;
errno_t rc = ipc_phone_hangup(kobj->phone);
kobject_put(kobj);
cap_free(TASK, handle);
return rc;
}
/** Wait for an incoming IPC call or an answer.
*
* @param calldata Pointer to buffer where the call/answer data is stored.
* @param usec Timeout. See waitq_sleep_timeout() for explanation.
* @param flags Select mode of sleep operation. See waitq_sleep_timeout()
* for explanation.
*
* @return An error code on error.
*/
sys_errno_t sys_ipc_wait_for_call(uspace_ptr_ipc_data_t calldata, uint32_t usec,
unsigned int flags)
{
call_t *call = NULL;
errno_t rc;
restart:
#ifdef CONFIG_UDEBUG
udebug_stoppable_begin();
#endif
rc = ipc_wait_for_call(&TASK->answerbox, usec,
flags | SYNCH_FLAGS_INTERRUPTIBLE, &call);
#ifdef CONFIG_UDEBUG
udebug_stoppable_end();
#endif
if (rc != EOK)
return rc;
assert(call);
call->data.flags = call->flags;
if (call->flags & IPC_CALL_NOTIF) {
/* Set the request_label to the interrupt counter */
call->data.request_label = (sysarg_t) call->priv;
call->data.cap_handle = CAP_NIL;
STRUCT_TO_USPACE(calldata, &call->data);
kobject_put(call->kobject);
return EOK;
}
if (call->flags & IPC_CALL_ANSWERED) {
process_answer(call);
if (call->flags & IPC_CALL_DISCARD_ANSWER) {
kobject_put(call->kobject);
goto restart;
}
call->data.cap_handle = CAP_NIL;
STRUCT_TO_USPACE(calldata, &call->data);
kobject_put(call->kobject);
return EOK;
}
if (process_request(&TASK->answerbox, call))
goto restart;
cap_handle_t handle = CAP_NIL;
rc = cap_alloc(TASK, &handle);
if (rc != EOK) {
goto error;
}
call->data.cap_handle = handle;
/*
* Copy the whole call->data to include the request label.
*/
rc = STRUCT_TO_USPACE(calldata, &call->data);
if (rc != EOK)
goto error;
kobject_add_ref(call->kobject);
cap_publish(TASK, handle, call->kobject);
return EOK;
error:
if (cap_handle_valid(handle))
cap_free(TASK, handle);
/*
* The callee will not receive this call and no one else has a chance to
* answer it. Set the IPC_CALL_AUTO_REPLY flag and return the EPARTY
* error code.
*/
ipc_data_t saved_data;
bool saved;
if (answer_need_old(call)) {
memcpy(&saved_data, &call->data, sizeof(call->data));
saved = true;
} else
saved = false;
ipc_set_retval(&call->data, EPARTY);
(void) answer_preprocess(call, saved ? &saved_data : NULL);
call->flags |= IPC_CALL_AUTO_REPLY;
ipc_answer(&TASK->answerbox, call);
return rc;
}
/** Interrupt one thread from sys_ipc_wait_for_call().
*
*/
sys_errno_t sys_ipc_poke(void)
{
waitq_wake_one(&TASK->answerbox.wq);
return EOK;
}
/** Connect an IRQ handler to a task.
*
* @param inr IRQ number.
* @param imethod Interface and method to be associated with the notification.
* @param ucode Uspace pointer to the top-half pseudocode.
*
* @param[out] uspace_handle Uspace pointer to IRQ capability handle
*
* @return EPERM
* @return Error code returned by ipc_irq_subscribe().
*
*/
sys_errno_t sys_ipc_irq_subscribe(inr_t inr, sysarg_t imethod,
uspace_ptr_irq_code_t ucode, uspace_ptr_cap_irq_handle_t uspace_handle)
{
if (!(perm_get(TASK) & PERM_IRQ_REG))
return EPERM;
return ipc_irq_subscribe(&TASK->answerbox, inr, imethod, ucode, uspace_handle);
}
/** Disconnect an IRQ handler from a task.
*
* @param handle IRQ capability handle.
*
* @return Zero on success or EPERM on error.
*
*/
sys_errno_t sys_ipc_irq_unsubscribe(cap_irq_handle_t handle)
{
if (!(perm_get(TASK) & PERM_IRQ_REG))
return EPERM;
ipc_irq_unsubscribe(&TASK->answerbox, handle);
return 0;
}
/** Syscall connect to a task by ID
*
* @return Error code.
*
*/
sys_errno_t sys_ipc_connect_kbox(uspace_ptr_task_id_t uspace_taskid,
uspace_ptr_cap_phone_handle_t uspace_phone)
{
#ifdef CONFIG_UDEBUG
task_id_t taskid;
cap_phone_handle_t phone;
errno_t rc = copy_from_uspace(&taskid, uspace_taskid, sizeof(task_id_t));
if (rc == EOK) {
rc = ipc_connect_kbox((task_id_t) taskid, &phone);
}
if (rc == EOK) {
rc = copy_to_uspace(uspace_phone, &phone, sizeof(cap_handle_t));
if (rc != EOK) {
// Clean up the phone on failure.
sys_ipc_hangup(phone);
}
}
return (sys_errno_t) rc;
#else
return (sys_errno_t) ENOTSUP;
#endif
}
/** @}
*/