sys/src/system_service_dispatcher.c

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// _Id: system_service_dispatcher.c,v 1.5 2009-05-09 13:31:09 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.
/**
   \file system_service_dispatcher.c
   \brief dispatch system services
   \author Roar Thronæs
 */

#include <linux/linkage.h>
#include <linux/sched.h>

#include <ipldef.h>
#include <system_data_cells.h>
#include <ipl.h>
#include <sch_routines.h>

/**
   \brief run after ast called in lower level modes - see 5.2 7.5.3
   \details clears astact bit and rewinds stack
*/

asmlinkage int cmod_astexit() {
  struct _pcb * p = ctl_gl_pcb;
  setipl(IPL__ASTDEL);
  // clear a pcb_l_astact bit
  test_and_clear_bit(p->psl_prv_mod, &p->pcb_b_astact); // check
  sch_newlvl(p);
#ifdef __i386__
  __asm__ __volatile__(
                       "addl _0x40, %esp\n\t" // check. rewind stack
                       );
#endif
#ifdef __x86_64__
  __asm__ __volatile__(
                       "addq _0x88, %rsp\n\t" // check. rewind stack
                       );
#endif
}

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