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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file ipc.c
* Interprocess communication syscall implementations.
*/
#include <kmi/uapi.h>
#include <kmi/tcb.h>
#include <kmi/ipi.h>
/**
* IPC server notification syscall handler.
*
* @param t Current tcb.
* @param callback Address of server callback.
* @return \ref OK and \c 0.
*/
SYSCALL_DEFINE1(ipc_server)(struct tcb *t, sys_arg_t callback)
{
get_cproc(t)->callback = callback;
return_args(t, SYS_RET1(OK));
}
/**
* Actual IPC syscall handler.
*
* @param t Current tcb.
* @param pid Process to request RPC to.
* @param d0 IPC argument 0.
* @param d1 IPC argument 1.
* @param d2 IPC argument 2.
* @param d3 IPC argument 3.
* @param fwd Whether to forward.
*
* Returns \ref ERR_OOMEM if there isn't enough IPC stack left, \ref ERR_INVAL
* if the the target process doesn't exist, \ref ERR_NOINIT if the target
* process hasn't defined a callback. Otherwise \ref OK and whatever the target
* process sends back.
*/
static void do_ipc(struct tcb *t,
sys_arg_t pid,
sys_arg_t d0,
sys_arg_t d1,
sys_arg_t d2,
sys_arg_t d3,
bool fwd)
{
if (!enough_rpc_stack(t))
return_args(t, SYS_RET1(ERR_OOMEM));
struct tcb *r = get_tcb(pid);
if (!r)
return_args(t, SYS_RET1(ERR_INVAL));
r = get_rproc(r);
if (!r->callback)
return_args(t, SYS_RET1(ERR_NOINIT));
clone_uvmem(r->proc.vmem, t->rpc.vmem);
enter_rpc(t);
set_return(t, r->callback);
attach_rpc(r, t);
if (!fwd)
t->eid = t->pid;
t->pid = r->rid;
return_args(t, SYS_RET6(OK, t->eid, d0, d1, d2, d3));
}
/**
* IPC request syscall handler.
*
* @param t Current tcb.
* @param pid Process to request RPC to.
* @param d0 IPC argument 0.
* @param d1 IPC argument 1.
* @param d2 IPC argument 2.
* @param d3 IPC argument 3.
* @return When succesful: OK, thread id of the caller and the arguments as-is.
*/
SYSCALL_DEFINE5(ipc_req)(struct tcb *t, sys_arg_t pid,
sys_arg_t d0, sys_arg_t d1, sys_arg_t d2, sys_arg_t d3)
{
do_ipc(t, pid, d0, d1, d2, d3, false);
}
/**
* IPC forwarding syscall handler.
*
* @param t Current tcb.
* @param pid Process to request RPC to.
* @param d0 IPC argument 0.
* @param d1 IPC argument 1.
* @param d2 IPC argument 2.
* @param d3 IPC argument 3.
* @return
*/
SYSCALL_DEFINE5(ipc_fwd)(struct tcb *t, sys_arg_t pid,
sys_arg_t d0, sys_arg_t d1, sys_arg_t d2, sys_arg_t d3)
{
do_ipc(t, pid, d0, d1, d2, d3, true);
}
/**
* IPC response syscall handler.
*
* @param t Current tcb.
* @param d0 IPC return value 0.
* @param d1 IPC return value 1.
* @param d2 IPC return value 2.
* @param d3 IPC return value 3.
* @return \c d0 and \c d1.
*/
SYSCALL_DEFINE4(ipc_resp)(struct tcb *t, sys_arg_t d0, sys_arg_t d1,
sys_arg_t d2,
sys_arg_t d3)
{
struct tcb *r = get_cproc(t);
leave_rpc(t);
detach_rpc(r, t);
if (is_rpc(t))
use_vmem(t->rpc.vmem);
else
use_vmem(t->proc.vmem);
return_args(t, SYS_RET6(OK, t->tid, d0, d1, d2, d3));
}
/**
* Notify syscall handler.
*
* \todo Implement.
*
* @param t Current tcb.
* @param tid Thread ID to notify.
* @return \ref OK and 0.
*/
SYSCALL_DEFINE1(ipc_notify)(struct tcb *t, sys_arg_t tid){
if (!has_cap(t->caps, CAP_CALL))
return_args(t, SYS_RET1(ERR_PERM));
struct tcb *r = get_tcb(tid);
if (r->notify_state == NOTIFY_QUEUED)
return_args(t, SYS_RET1(OK));
if (r->notify_state == NOTIFY_RUNNING) {
t->notify_state = NOTIFY_QUEUED;
return_args(t, SYS_RET1(OK));
}
r->notify_state = NOTIFY_QUEUED;
if (running(r))
send_ipi(r);
return_args(t, SYS_RET1(OK));
}
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