ipc.h

/*
 * Copyright (C) 2021, 2024-2025 Kernkonzept GmbH.
 * Author(s): Georg Kotheimer <georg.kotheimer@kernkonzept.com>
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
#pragma once
 
#include <l4/sys/compiler.h>
 
L4_INLINE l4_msgtag_t
l4_ipc(l4_cap_idx_t dest, l4_utcb_t *utcb,
       l4_umword_t flags,
       l4_umword_t slabel,
       l4_msgtag_t tag,
       l4_umword_t *rlabel,
       l4_timeout_t timeout) L4_NOTHROW
{
  register l4_mword_t _tag       __asm__("a0") = tag.raw;
  register l4_umword_t _dest     __asm__("a1") = dest | flags;
  register l4_umword_t _timeout  __asm__("a2") = timeout.raw;
  register l4_umword_t _label    __asm__("a3") = slabel;
  (void)utcb;
 
  __asm__ __volatile__
    ("ecall"
     :
     "+r" (_tag),
     "+r" (_dest),
     "+r" (_timeout),
     "+r" (_label)
     :
     :
     "memory");
 
  if (rlabel)
    *rlabel = _label;
  tag.raw = _tag;
 
  return tag;
}