util.h

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/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>,
 *               Frank Mehnert <fm3@os.inf.tu-dresden.de>,
 *               Jork Löser <jork@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 Lesser General Public License 2.1.
 * Please see the COPYING-LGPL-2.1 file for details.
 */
#ifndef __UTIL_H
#define __UTIL_H
 
#include <l4/sys/types.h>
#include <l4/sys/compiler.h>
#include <l4/sys/ipc.h>
 
EXTERN_C_BEGIN
 
L4_CV l4_timeout_s l4util_micros2l4to(unsigned int mus) L4_NOTHROW;
 
L4_CV void l4_sleep(int ms) L4_NOTHROW;
 
/* Suspend thread for a period of \a us microseconds.
 * \param us Time in microseconds
 * WARNING: This function is mostly bogus since the timer resolution of
 *          current L4 implementations is about 1ms! */
L4_CV void l4_usleep(int us) L4_NOTHROW;
 
L4_INLINE void l4_sleep_forever(void) L4_NOTHROW __attribute__((noreturn));
 
L4_INLINE void
l4_sleep_forever(void) L4_NOTHROW
{
  for (;;)
    l4_ipc_sleep(L4_IPC_NEVER);
}
 
static inline void
l4_touch_ro(const void*addr, unsigned size) L4_NOTHROW
{
  const char *bptr, *eptr;
 
  bptr = (const char*)(((l4_addr_t)addr) & L4_PAGEMASK);
  eptr = (const char*)(((l4_addr_t)addr+size-1) & L4_PAGEMASK);
  for(;bptr<=eptr;bptr+=L4_PAGESIZE){
    asm volatile("or  %0,%%eax \n"
                 :
                 : "m" (*(const unsigned*)bptr)
                 : "eax" );
  }
}
 
 
static inline void
l4_touch_rw(const void*addr, unsigned size) L4_NOTHROW
{
  const char *bptr, *eptr;
 
  bptr = (const char*)(((l4_addr_t)addr) & L4_PAGEMASK);
  eptr = (const char*)(((l4_addr_t)addr+size-1) & L4_PAGEMASK);
  for(;bptr<=eptr;bptr+=L4_PAGESIZE){
    asm volatile("orb $0,%0 \n"
                 :
                 : "m" (*(const unsigned*)bptr)
                 );
  }
}
 
EXTERN_C_END
 
#endif