utcb.h

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/*****************************************************************************/
/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>,
 *               Torsten Frenzel <frenzel@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
/*****************************************************************************/
#ifndef _L4_SYS_UTCB_H
#define _L4_SYS_UTCB_H

#include <l4/sys/types.h>
#include <l4/sys/compiler.h>
#include <l4/sys/l4int.h>

typedef struct l4_utcb_t l4_utcb_t;

typedef union l4_msg_regs_t
{
  l4_umword_t mr[L4_UTCB_GENERIC_DATA_SIZE]; 
  l4_uint64_t mr64[L4_UTCB_GENERIC_DATA_SIZE / (sizeof(l4_uint64_t)/sizeof(l4_umword_t))]; 
} l4_msg_regs_t;

typedef struct l4_buf_regs_t
{
  l4_umword_t bdr;

  l4_umword_t br[L4_UTCB_GENERIC_BUFFERS_SIZE];
} l4_buf_regs_t;

typedef struct l4_thread_regs_t
{
  l4_umword_t  error;
  l4_timeout_t xfer;
  l4_umword_t  user[3];
} l4_thread_regs_t;

__BEGIN_DECLS

L4_CV l4_utcb_t *l4_utcb_wrap(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_utcb_t *l4_utcb_direct(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_utcb_t *l4_utcb(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_msg_regs_t *l4_utcb_mr(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_msg_regs_t *l4_utcb_mr_u(l4_utcb_t *u) L4_NOTHROW L4_PURE;

L4_INLINE l4_buf_regs_t *l4_utcb_br(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_buf_regs_t *l4_utcb_br_u(l4_utcb_t *u) L4_NOTHROW L4_PURE;

L4_INLINE l4_thread_regs_t *l4_utcb_tcr(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_thread_regs_t *l4_utcb_tcr_u(l4_utcb_t *u) L4_NOTHROW L4_PURE;

L4_INLINE l4_exc_regs_t *l4_utcb_exc(void) L4_NOTHROW L4_PURE;

L4_INLINE l4_exc_regs_t *l4_utcb_exc_u(l4_utcb_t *u) L4_NOTHROW L4_PURE;

L4_INLINE l4_umword_t l4_utcb_exc_pc(l4_exc_regs_t const *u) L4_NOTHROW L4_PURE;

L4_INLINE void l4_utcb_exc_pc_set(l4_exc_regs_t *u, l4_addr_t pc) L4_NOTHROW;

L4_INLINE unsigned long l4_utcb_exc_typeval(l4_exc_regs_t const *u) L4_NOTHROW L4_PURE;

L4_INLINE int l4_utcb_exc_is_pf(l4_exc_regs_t const *u) L4_NOTHROW L4_PURE;

L4_INLINE l4_addr_t l4_utcb_exc_pfa(l4_exc_regs_t const *u) L4_NOTHROW L4_PURE;


L4_INLINE int l4_utcb_exc_is_ex_regs_exception(l4_exc_regs_t const *u) L4_NOTHROW L4_PURE;

L4_INLINE void l4_utcb_inherit_fpu(int switch_on) L4_NOTHROW;

L4_INLINE void l4_utcb_inherit_fpu_u(l4_utcb_t *u, int switch_on) L4_NOTHROW;

L4_INLINE
l4_timeout_s l4_timeout_abs_u(l4_kernel_clock_t pint, int br,
                              l4_utcb_t *utcb) L4_NOTHROW;
L4_INLINE
l4_timeout_s l4_timeout_abs(l4_kernel_clock_t pint, int br) L4_NOTHROW;

L4_INLINE
unsigned l4_utcb_mr64_idx(unsigned idx) L4_NOTHROW;

/**************************************************************************
 * Implementations
 **************************************************************************/

L4_INLINE l4_msg_regs_t *l4_utcb_mr_u(l4_utcb_t *u) L4_NOTHROW
{ return (l4_msg_regs_t*)((char*)u + L4_UTCB_MSG_REGS_OFFSET); }

L4_INLINE l4_buf_regs_t *l4_utcb_br_u(l4_utcb_t *u) L4_NOTHROW
{ return (l4_buf_regs_t*)((char*)u + L4_UTCB_BUF_REGS_OFFSET); }

L4_INLINE l4_thread_regs_t *l4_utcb_tcr_u(l4_utcb_t *u) L4_NOTHROW
{ return (l4_thread_regs_t*)((char*)u + L4_UTCB_THREAD_REGS_OFFSET); }

L4_INLINE l4_exc_regs_t *l4_utcb_exc_u(l4_utcb_t *u) L4_NOTHROW
{ return (l4_exc_regs_t*)((char*)u + L4_UTCB_MSG_REGS_OFFSET); }

L4_INLINE void l4_utcb_inherit_fpu_u(l4_utcb_t *u, int switch_on) L4_NOTHROW
{
  if (switch_on)
    l4_utcb_br_u(u)->bdr |= L4_UTCB_INHERIT_FPU;
  else
    l4_utcb_br_u(u)->bdr &= ~L4_UTCB_INHERIT_FPU;
}

L4_INLINE l4_utcb_t *l4_utcb(void) L4_NOTHROW
{
#ifdef L4SYS_USE_UTCB_WRAP
  return l4_utcb_wrap();
#else
  return l4_utcb_direct();
#endif
}




L4_INLINE l4_msg_regs_t *l4_utcb_mr(void) L4_NOTHROW
{ return l4_utcb_mr_u(l4_utcb()); }

L4_INLINE l4_buf_regs_t *l4_utcb_br(void) L4_NOTHROW
{ return l4_utcb_br_u(l4_utcb()); }

L4_INLINE l4_thread_regs_t *l4_utcb_tcr(void) L4_NOTHROW
{ return l4_utcb_tcr_u(l4_utcb()); }

L4_INLINE l4_exc_regs_t *l4_utcb_exc(void) L4_NOTHROW
{ return l4_utcb_exc_u(l4_utcb()); }

L4_INLINE void l4_utcb_inherit_fpu(int switch_on) L4_NOTHROW
{ l4_utcb_inherit_fpu_u(l4_utcb(), switch_on); }

L4_INLINE
l4_timeout_s l4_timeout_abs_u(l4_kernel_clock_t val, int pos,
                              l4_utcb_t *utcb) L4_NOTHROW
{
  union T
  {
    l4_kernel_clock_t t;
    l4_umword_t m[sizeof(l4_kernel_clock_t)/sizeof(l4_umword_t)];
  };
  l4_timeout_s to;
  to.t = 0x8000 | pos;
  ((union T*)(l4_utcb_br_u(utcb)->br + pos))->t = val;
  return to;
}

L4_INLINE
l4_timeout_s l4_timeout_abs(l4_kernel_clock_t val, int pos) L4_NOTHROW
{ return l4_timeout_abs_u(val, pos, l4_utcb()); }

L4_INLINE unsigned l4_utcb_mr64_idx(unsigned idx) L4_NOTHROW
{ return idx / (sizeof(l4_uint64_t) / sizeof(l4_umword_t)); }

__END_DECLS

#endif /* ! _L4_SYS_UTCB_H */