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/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file ipc.c
* Interprocess communication syscall implementations.
*/
#include <apos/uapi.h>
#include <apos/tcb.h>
/**
* IPC server notification syscall handler.
*
* @param callback Address of server callback.
* @return \ref ERR_EXT and \c 0 if process already is a server,
* \ref OK and \c 0 otherwise.
*/
SYSCALL_DEFINE1(ipc_server)(sys_arg_t callback)
{
struct tcb *r = cur_tcb();
if (r->callback) /* server can't be reinitialized */
return (struct sys_ret){ ERR_EXT, 0 };
r->callback = callback;
return (struct sys_ret){ OK, 0 };
}
/**
* IPC request syscall handler.
*
* @param pid Process to request RPC to.
* @param d0 IPC argument 0.
* @param d1 IPC argument 1.
* @return \c d0 and \c d1.
*/
SYSCALL_DEFINE3(ipc_req)(sys_arg_t pid, sys_arg_t d0, sys_arg_t d1)
{
struct tcb *r = get_tcb(pid);
/** \todo something like jump_to_callback(t) */
/* remember difference between ipc_req and ipc_fwd! */
return (struct sys_ret){ d0, d1 };
}
/**
* IPC forwarding syscall handler.
*
* @param pid Process to rquest RPC to.
* @param d0 IPC argument 0.
* @param d1 IPC argument 1.
* @return \c d0 and \c d1.
*/
SYSCALL_DEFINE3(ipc_fwd)(sys_arg_t pid, sys_arg_t d0, sys_arg_t d1)
{
struct tcb *t = get_tcb(pid);
/* ditto */
return (struct sys_ret){ d0, d1 };
}
/**
* IPC response syscall handler.
*
* @param d0 IPC return value 0.
* @param d1 IPC return value 1.
* @return \c d0 and \c d1.
*/
SYSCALL_DEFINE2(ipc_resp)(sys_arg_t d0, sys_arg_t d1)
{
struct tcb *r = cur_tcb();
/* something like return_from_callback(t, r) */
return (struct sys_ret){ d0, d1 };
}
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