| 0,0 → 1,868 |
|---|
| /* |
| * 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 |
| */ |
| |
| #include <arch.h> |
| #include <proc/task.h> |
| #include <proc/thread.h> |
| #include <errno.h> |
| #include <memstr.h> |
| #include <debug.h> |
| #include <ipc/ipc.h> |
| #include <ipc/sysipc.h> |
| #include <ipc/irq.h> |
| #include <ipc/ipcrsc.h> |
| #include <arch/interrupt.h> |
| #include <print.h> |
| #include <syscall/copy.h> |
| #include <security/cap.h> |
| #include <mm/as.h> |
| #include <print.h> |
| |
| /** |
| * Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ |
| * requests. |
| */ |
| #define DATA_XFER_LIMIT (64 * 1024) |
| |
| #define GET_CHECK_PHONE(phone, phoneid, err) \ |
| { \ |
| if (phoneid > IPC_MAX_PHONES) { \ |
| err; \ |
| } \ |
| phone = &TASK->phones[phoneid]; \ |
| } |
| |
| #define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src))) |
| |
| /** Decide if the method is a system method. |
| * |
| * @param method Method to be decided. |
| * |
| * @return Return 1 if the method is a system method. |
| * Otherwise return 0. |
| */ |
| static inline int method_is_system(unative_t method) |
| { |
| if (method <= IPC_M_LAST_SYSTEM) |
| return 1; |
| return 0; |
| } |
| |
| /** Decide if the message with this method is forwardable. |
| * |
| * - some system messages may be forwarded, for some of them |
| * it is useless |
| * |
| * @param method Method to be decided. |
| * |
| * @return Return 1 if the method is forwardable. |
| * Otherwise return 0. |
| */ |
| static inline int method_is_forwardable(unative_t method) |
| { |
| switch (method) { |
| case IPC_M_PHONE_HUNGUP: |
| /* This message is meant only for the original recipient. */ |
| return 0; |
| default: |
| return 1; |
| } |
| } |
| |
| /** Decide if the message with this method is immutable on forward. |
| * |
| * - some system messages may be forwarded but their content cannot be altered |
| * |
| * @param method Method to be decided. |
| * |
| * @return Return 1 if the method is immutable on forward. |
| * Otherwise return 0. |
| */ |
| static inline int method_is_immutable(unative_t method) |
| { |
| switch (method) { |
| case IPC_M_SHARE_OUT: |
| case IPC_M_SHARE_IN: |
| case IPC_M_DATA_WRITE: |
| case IPC_M_DATA_READ: |
| return 1; |
| break; |
| default: |
| return 0; |
| } |
| } |
| |
| |
| /*********************************************************************** |
| * 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 Return 1 if the old call contents should be saved. |
| * Return 0 otherwise. |
| */ |
| static inline int answer_need_old(call_t *call) |
| { |
| switch (IPC_GET_METHOD(call->data)) { |
| case IPC_M_CONNECT_TO_ME: |
| case IPC_M_CONNECT_ME_TO: |
| case IPC_M_SHARE_OUT: |
| case IPC_M_SHARE_IN: |
| case IPC_M_DATA_WRITE: |
| case IPC_M_DATA_READ: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| /** 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 0 on success or an error code. |
| */ |
| static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata) |
| { |
| int phoneid; |
| |
| if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) { |
| /* In case of forward, hangup the forwared phone, |
| * not the originator |
| */ |
| mutex_lock(&answer->data.phone->lock); |
| spinlock_lock(&TASK->answerbox.lock); |
| if (answer->data.phone->state == IPC_PHONE_CONNECTED) { |
| list_remove(&answer->data.phone->link); |
| answer->data.phone->state = IPC_PHONE_SLAMMED; |
| } |
| spinlock_unlock(&TASK->answerbox.lock); |
| mutex_unlock(&answer->data.phone->lock); |
| } |
| |
| if (!olddata) |
| return 0; |
| |
| if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) { |
| phoneid = IPC_GET_ARG5(*olddata); |
| if (IPC_GET_RETVAL(answer->data)) { |
| /* The connection was not accepted */ |
| phone_dealloc(phoneid); |
| } else { |
| /* The connection was accepted */ |
| phone_connect(phoneid, &answer->sender->answerbox); |
| /* Set 'phone hash' as arg5 of response */ |
| IPC_SET_ARG5(answer->data, |
| (unative_t) &TASK->phones[phoneid]); |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) { |
| /* If the users accepted call, connect */ |
| if (!IPC_GET_RETVAL(answer->data)) { |
| ipc_phone_connect((phone_t *) IPC_GET_ARG5(*olddata), |
| &TASK->answerbox); |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) { |
| if (!IPC_GET_RETVAL(answer->data)) { |
| /* Accepted, handle as_area receipt */ |
| ipl_t ipl; |
| int rc; |
| as_t *as; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&answer->sender->lock); |
| as = answer->sender->as; |
| spinlock_unlock(&answer->sender->lock); |
| interrupts_restore(ipl); |
| |
| rc = as_area_share(as, IPC_GET_ARG1(*olddata), |
| IPC_GET_ARG2(*olddata), AS, |
| IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata)); |
| IPC_SET_RETVAL(answer->data, rc); |
| return rc; |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) { |
| if (!IPC_GET_RETVAL(answer->data)) { |
| ipl_t ipl; |
| as_t *as; |
| int rc; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&answer->sender->lock); |
| as = answer->sender->as; |
| spinlock_unlock(&answer->sender->lock); |
| interrupts_restore(ipl); |
| |
| rc = as_area_share(AS, IPC_GET_ARG1(answer->data), |
| IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata), |
| IPC_GET_ARG2(answer->data)); |
| IPC_SET_RETVAL(answer->data, rc); |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) { |
| ASSERT(!answer->buffer); |
| if (!IPC_GET_RETVAL(answer->data)) { |
| /* The recipient agreed to send data. */ |
| uintptr_t src = IPC_GET_ARG1(answer->data); |
| uintptr_t dst = IPC_GET_ARG1(*olddata); |
| size_t max_size = IPC_GET_ARG2(*olddata); |
| size_t size = IPC_GET_ARG2(answer->data); |
| if (size && size <= max_size) { |
| /* |
| * Copy the destination VA so that this piece of |
| * information is not lost. |
| */ |
| IPC_SET_ARG1(answer->data, dst); |
| |
| answer->buffer = malloc(size, 0); |
| int rc = copy_from_uspace(answer->buffer, |
| (void *) src, size); |
| if (rc) { |
| IPC_SET_RETVAL(answer->data, rc); |
| free(answer->buffer); |
| answer->buffer = NULL; |
| } |
| } else if (!size) { |
| IPC_SET_RETVAL(answer->data, EOK); |
| } else { |
| IPC_SET_RETVAL(answer->data, ELIMIT); |
| } |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) { |
| ASSERT(answer->buffer); |
| if (!IPC_GET_RETVAL(answer->data)) { |
| /* The recipient agreed to receive data. */ |
| int rc; |
| uintptr_t dst; |
| size_t size; |
| size_t max_size; |
| |
| dst = (uintptr_t)IPC_GET_ARG1(answer->data); |
| size = (size_t)IPC_GET_ARG2(answer->data); |
| max_size = (size_t)IPC_GET_ARG2(*olddata); |
| |
| if (size <= max_size) { |
| rc = copy_to_uspace((void *) dst, |
| answer->buffer, size); |
| if (rc) |
| IPC_SET_RETVAL(answer->data, rc); |
| } else { |
| IPC_SET_RETVAL(answer->data, ELIMIT); |
| } |
| } |
| free(answer->buffer); |
| answer->buffer = NULL; |
| } |
| return 0; |
| } |
| |
| /** Called before the request is sent. |
| * |
| * @param call Call structure with the request. |
| * |
| * @return Return 0 on success, ELIMIT or EPERM on error. |
| */ |
| static int request_preprocess(call_t *call) |
| { |
| int newphid; |
| size_t size; |
| uintptr_t src; |
| int rc; |
| |
| switch (IPC_GET_METHOD(call->data)) { |
| case IPC_M_CONNECT_ME_TO: |
| newphid = phone_alloc(); |
| if (newphid < 0) |
| return ELIMIT; |
| /* Set arg5 for server */ |
| IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]); |
| call->flags |= IPC_CALL_CONN_ME_TO; |
| call->priv = newphid; |
| break; |
| case IPC_M_SHARE_OUT: |
| size = as_area_get_size(IPC_GET_ARG1(call->data)); |
| if (!size) |
| return EPERM; |
| IPC_SET_ARG2(call->data, size); |
| break; |
| case IPC_M_DATA_READ: |
| size = IPC_GET_ARG2(call->data); |
| if ((size <= 0 || (size > DATA_XFER_LIMIT))) |
| return ELIMIT; |
| break; |
| case IPC_M_DATA_WRITE: |
| src = IPC_GET_ARG1(call->data); |
| size = IPC_GET_ARG2(call->data); |
| |
| if ((size <= 0) || (size > DATA_XFER_LIMIT)) |
| return ELIMIT; |
| |
| call->buffer = (uint8_t *) malloc(size, 0); |
| rc = copy_from_uspace(call->buffer, (void *) src, size); |
| if (rc != 0) { |
| free(call->buffer); |
| return rc; |
| } |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| /******************************************************************************* |
| * 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 (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) && |
| (call->flags & IPC_CALL_FORWARDED)) |
| IPC_SET_RETVAL(call->data, EFORWARD); |
| |
| if (call->flags & IPC_CALL_CONN_ME_TO) { |
| if (IPC_GET_RETVAL(call->data)) |
| phone_dealloc(call->priv); |
| else |
| IPC_SET_ARG5(call->data, call->priv); |
| } |
| |
| if (call->buffer) { |
| /* This must be an affirmative answer to IPC_M_DATA_READ. */ |
| uintptr_t dst = IPC_GET_ARG1(call->data); |
| size_t size = IPC_GET_ARG2(call->data); |
| int rc = copy_to_uspace((void *) dst, call->buffer, size); |
| if (rc) |
| IPC_SET_RETVAL(call->data, rc); |
| free(call->buffer); |
| call->buffer = NULL; |
| } |
| } |
| |
| /** Do basic kernel processing of received call request. |
| * |
| * @param box Destination answerbox structure. |
| * @param call Call structure with the request. |
| * |
| * @return 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) |
| { |
| int phoneid; |
| |
| if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) { |
| phoneid = phone_alloc(); |
| if (phoneid < 0) { /* Failed to allocate phone */ |
| IPC_SET_RETVAL(call->data, ELIMIT); |
| ipc_answer(box, call); |
| return -1; |
| } |
| IPC_SET_ARG5(call->data, phoneid); |
| } |
| return 0; |
| } |
| |
| /** Make a fast call over IPC, wait for reply and return to user. |
| * |
| * This function can handle only three arguments of payload, but is faster than |
| * the generic function (i.e. sys_ipc_call_sync_slow()). |
| * |
| * @param phoneid Phone handle for the call. |
| * @param method Method of the call. |
| * @param arg1 Service-defined payload argument. |
| * @param arg2 Service-defined payload argument. |
| * @param arg3 Service-defined payload argument. |
| * @param data Address of userspace structure where the reply call will |
| * be stored. |
| * |
| * @return Returns 0 on success. |
| * Return ENOENT if there is no such phone handle. |
| */ |
| unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method, |
| unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data) |
| { |
| call_t call; |
| phone_t *phone; |
| int res; |
| int rc; |
| |
| GET_CHECK_PHONE(phone, phoneid, return ENOENT); |
| |
| ipc_call_static_init(&call); |
| IPC_SET_METHOD(call.data, method); |
| 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_ARG4(call.data, 0); |
| IPC_SET_ARG5(call.data, 0); |
| |
| if (!(res = request_preprocess(&call))) { |
| ipc_call_sync(phone, &call); |
| process_answer(&call); |
| } else { |
| IPC_SET_RETVAL(call.data, res); |
| } |
| rc = STRUCT_TO_USPACE(&data->args, &call.data.args); |
| if (rc != 0) |
| return rc; |
| |
| return 0; |
| } |
| |
| /** Make a synchronous IPC call allowing to transmit the entire payload. |
| * |
| * @param phoneid Phone handle for the call. |
| * @param question Userspace address of call data with the request. |
| * @param reply Userspace address of call data where to store the |
| * answer. |
| * |
| * @return Zero on success or an error code. |
| */ |
| unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question, |
| ipc_data_t *reply) |
| { |
| call_t call; |
| phone_t *phone; |
| int res; |
| int rc; |
| |
| ipc_call_static_init(&call); |
| rc = copy_from_uspace(&call.data.args, &question->args, |
| sizeof(call.data.args)); |
| if (rc != 0) |
| return (unative_t) rc; |
| |
| GET_CHECK_PHONE(phone, phoneid, return ENOENT); |
| |
| if (!(res = request_preprocess(&call))) { |
| ipc_call_sync(phone, &call); |
| process_answer(&call); |
| } else |
| IPC_SET_RETVAL(call.data, res); |
| |
| rc = STRUCT_TO_USPACE(&reply->args, &call.data.args); |
| if (rc != 0) |
| return rc; |
| |
| return 0; |
| } |
| |
| /** Check that the task did not exceed the allowed limit of asynchronous calls. |
| * |
| * @return Return 0 if limit not reached or -1 if limit exceeded. |
| */ |
| static int check_call_limit(void) |
| { |
| if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) { |
| atomic_dec(&TASK->active_calls); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /** Make a fast asynchronous call over IPC. |
| * |
| * This function can only handle four arguments of payload, but is faster than |
| * the generic function sys_ipc_call_async_slow(). |
| * |
| * @param phoneid Phone handle for the call. |
| * @param method Method of the call. |
| * @param arg1 Service-defined payload argument. |
| * @param arg2 Service-defined payload argument. |
| * @param arg3 Service-defined payload argument. |
| * @param arg4 Service-defined payload argument. |
| * |
| * @return Return call hash on success. |
| * Return IPC_CALLRET_FATAL in case of a fatal error and |
| * IPC_CALLRET_TEMPORARY if there are too many pending |
| * asynchronous requests; answers should be handled first. |
| */ |
| unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method, |
| unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4) |
| { |
| call_t *call; |
| phone_t *phone; |
| int res; |
| |
| if (check_call_limit()) |
| return IPC_CALLRET_TEMPORARY; |
| |
| GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL); |
| |
| call = ipc_call_alloc(0); |
| IPC_SET_METHOD(call->data, method); |
| 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); |
| |
| if (!(res = request_preprocess(call))) |
| ipc_call(phone, call); |
| else |
| ipc_backsend_err(phone, call, res); |
| |
| return (unative_t) call; |
| } |
| |
| /** Make an asynchronous IPC call allowing to transmit the entire payload. |
| * |
| * @param phoneid Phone handle for the call. |
| * @param data Userspace address of call data with the request. |
| * |
| * @return See sys_ipc_call_async_fast(). |
| */ |
| unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data) |
| { |
| call_t *call; |
| phone_t *phone; |
| int res; |
| int rc; |
| |
| if (check_call_limit()) |
| return IPC_CALLRET_TEMPORARY; |
| |
| GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL); |
| |
| call = ipc_call_alloc(0); |
| rc = copy_from_uspace(&call->data.args, &data->args, |
| sizeof(call->data.args)); |
| if (rc != 0) { |
| ipc_call_free(call); |
| return (unative_t) rc; |
| } |
| if (!(res = request_preprocess(call))) |
| ipc_call(phone, call); |
| else |
| ipc_backsend_err(phone, call, res); |
| |
| return (unative_t) call; |
| } |
| |
| /** Forward a received call to another destination. |
| * |
| * @param callid Hash of the call to forward. |
| * @param phoneid Phone handle to use for forwarding. |
| * @param method New 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 Return 0 on succes, otherwise return an error code. |
| * |
| * In case the original 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 METHOD, ARG1 and ARG2 are rewritten with |
| * the new method, arg1 and arg2, respectively. Also note there is a set of |
| * immutable methods, for which the new method and argument is not set and |
| * these values are ignored. |
| * |
| * Warning: When implementing support for changing additional payload |
| * arguments, make sure that ARG5 is not rewritten for certain |
| * system IPC |
| */ |
| unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid, |
| unative_t method, unative_t arg1, unative_t arg2, int mode) |
| { |
| call_t *call; |
| phone_t *phone; |
| |
| call = get_call(callid); |
| if (!call) |
| return ENOENT; |
| |
| call->flags |= IPC_CALL_FORWARDED; |
| |
| GET_CHECK_PHONE(phone, phoneid, { |
| IPC_SET_RETVAL(call->data, EFORWARD); |
| ipc_answer(&TASK->answerbox, call); |
| return ENOENT; |
| }); |
| |
| if (!method_is_forwardable(IPC_GET_METHOD(call->data))) { |
| IPC_SET_RETVAL(call->data, EFORWARD); |
| ipc_answer(&TASK->answerbox, call); |
| return EPERM; |
| } |
| |
| /* |
| * Userspace is not allowed to change method of system methods on |
| * forward, allow changing ARG1, ARG2 and ARG3 by means of method, |
| * arg1 and arg2. |
| * If the method is immutable, don't change anything. |
| */ |
| if (!method_is_immutable(IPC_GET_METHOD(call->data))) { |
| if (method_is_system(IPC_GET_METHOD(call->data))) { |
| if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) |
| phone_dealloc(IPC_GET_ARG5(call->data)); |
| |
| IPC_SET_ARG1(call->data, method); |
| IPC_SET_ARG2(call->data, arg1); |
| IPC_SET_ARG3(call->data, arg2); |
| } else { |
| IPC_SET_METHOD(call->data, method); |
| IPC_SET_ARG1(call->data, arg1); |
| IPC_SET_ARG2(call->data, arg2); |
| } |
| } |
| |
| return ipc_forward(call, phone, &TASK->answerbox, mode); |
| } |
| |
| /** 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 callid Hash of the call 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 Return 0 on success, otherwise return an error code. |
| */ |
| unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval, |
| unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4) |
| { |
| call_t *call; |
| ipc_data_t saved_data; |
| int saveddata = 0; |
| int rc; |
| |
| /* Do not answer notification callids */ |
| if (callid & IPC_CALLID_NOTIFICATION) |
| return 0; |
| |
| call = get_call(callid); |
| if (!call) |
| return ENOENT; |
| |
| if (answer_need_old(call)) { |
| memcpy(&saved_data, &call->data, sizeof(call->data)); |
| saveddata = 1; |
| } |
| |
| 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); |
| rc = answer_preprocess(call, saveddata ? &saved_data : NULL); |
| |
| ipc_answer(&TASK->answerbox, call); |
| return rc; |
| } |
| |
| /** Answer an IPC call. |
| * |
| * @param callid Hash of the call to be answered. |
| * @param data Userspace address of call data with the answer. |
| * |
| * @return Return 0 on success, otherwise return an error code. |
| */ |
| unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data) |
| { |
| call_t *call; |
| ipc_data_t saved_data; |
| int saveddata = 0; |
| int rc; |
| |
| /* Do not answer notification callids */ |
| if (callid & IPC_CALLID_NOTIFICATION) |
| return 0; |
| |
| call = get_call(callid); |
| if (!call) |
| return ENOENT; |
| |
| if (answer_need_old(call)) { |
| memcpy(&saved_data, &call->data, sizeof(call->data)); |
| saveddata = 1; |
| } |
| rc = copy_from_uspace(&call->data.args, &data->args, |
| sizeof(call->data.args)); |
| if (rc != 0) |
| return rc; |
| |
| rc = answer_preprocess(call, saveddata ? &saved_data : NULL); |
| |
| ipc_answer(&TASK->answerbox, call); |
| |
| return rc; |
| } |
| |
| /** Hang up a phone. |
| * |
| * @param Phone handle of the phone to be hung up. |
| * |
| * @return Return 0 on success or an error code. |
| */ |
| unative_t sys_ipc_hangup(int phoneid) |
| { |
| phone_t *phone; |
| |
| GET_CHECK_PHONE(phone, phoneid, return ENOENT); |
| |
| if (ipc_phone_hangup(phone)) |
| return -1; |
| |
| return 0; |
| } |
| |
| /** 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 Hash of the call. |
| * If IPC_CALLID_NOTIFICATION bit is set in the hash, the |
| * call is a notification. IPC_CALLID_ANSWERED denotes an |
| * answer. |
| */ |
| unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags) |
| { |
| call_t *call; |
| |
| restart: |
| call = ipc_wait_for_call(&TASK->answerbox, usec, |
| flags | SYNCH_FLAGS_INTERRUPTIBLE); |
| if (!call) |
| return 0; |
| |
| if (call->flags & IPC_CALL_NOTIF) { |
| ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC)); |
| |
| /* Set in_phone_hash to the interrupt counter */ |
| call->data.phone = (void *) call->priv; |
| |
| STRUCT_TO_USPACE(calldata, &call->data); |
| |
| ipc_call_free(call); |
| |
| return ((unative_t) call) | IPC_CALLID_NOTIFICATION; |
| } |
| |
| if (call->flags & IPC_CALL_ANSWERED) { |
| process_answer(call); |
| |
| ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC)); |
| |
| atomic_dec(&TASK->active_calls); |
| |
| if (call->flags & IPC_CALL_DISCARD_ANSWER) { |
| ipc_call_free(call); |
| goto restart; |
| } |
| |
| STRUCT_TO_USPACE(&calldata->args, &call->data.args); |
| ipc_call_free(call); |
| |
| return ((unative_t) call) | IPC_CALLID_ANSWERED; |
| } |
| |
| if (process_request(&TASK->answerbox, call)) |
| goto restart; |
| |
| /* Include phone address('id') of the caller in the request, |
| * copy whole call->data, not only call->data.args */ |
| if (STRUCT_TO_USPACE(calldata, &call->data)) { |
| return 0; |
| } |
| return (unative_t)call; |
| } |
| |
| /** Connect an IRQ handler to a task. |
| * |
| * @param inr IRQ number. |
| * @param devno Device number. |
| * @param method Method to be associated with the notification. |
| * @param ucode Uspace pointer to the top-half pseudocode. |
| * |
| * @return EPERM or a return code returned by ipc_irq_register(). |
| */ |
| unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method, |
| irq_code_t *ucode) |
| { |
| if (!(cap_get(TASK) & CAP_IRQ_REG)) |
| return EPERM; |
| |
| return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode); |
| } |
| |
| /** Disconnect an IRQ handler from a task. |
| * |
| * @param inr IRQ number. |
| * @param devno Device number. |
| * |
| * @return Zero on success or EPERM on error.. |
| */ |
| unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno) |
| { |
| if (!(cap_get(TASK) & CAP_IRQ_REG)) |
| return EPERM; |
| |
| ipc_irq_unregister(&TASK->answerbox, inr, devno); |
| |
| return 0; |
| } |
| |
| /** @} |
| */ |