sys/src/sysastcon.c

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// _Id: sysastcon.c,v 1.15 2009-05-09 13:31:09 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.
/**
   \file system ast control.c
   \brief ast controlling
   \author Roar Thronæs
 */


#include <system_data_cells.h>
#include <acbdef.h>
#include <pridef.h>
#include <cpudef.h>
#include <psldef.h>
#include <ssdef.h>
#include <sch_routines.h>
#include <linux/smp.h>
#include <asm/current.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>

/**
   \brief enabling/disabling ast delivery according to callers mode - see 5.2 7.6
   \param enbflg enable flag
   \details does not set reenable_asts and soft_ast_disable
   \details TODO: check implementation
*/

int exe_setast(char enbflg) {
  struct _cpu * cpu=smp_gl_cpu_data[smp_processor_id()];
  struct _pcb * p=ctl_gl_pcb;
  int retval;
  /** check if already set or unset */
  if (p->pcb_b_asten&(1<<p->psl_prv_mod))
    retval=SS__WASSET;
  else
    retval=SS__WASCLR;
  /** set accoring to priv level and recompute */
  if (p->oldpsl_prv_mod!=PSL_C_USER) { // check
  back:
    if (enbflg) 
      p->pcb_b_asten|=(1<<p->psl_prv_mod);
    else
      p->pcb_b_asten&=~(1<<p->psl_prv_mod);
    sch_newlvl(p);
    return retval;
  }
  goto back; // the same for now
  return retval;
}

/**
   \brief creating an ast - see 5.2 7.3
   \param astadr routine
   \param astprm parameter
   \param acmode access mode
*/

int exe_dclast(void (*astadr)(__unknown_params), unsigned long astprm, unsigned int acmode) {
  struct _cpu * cpu=smp_gl_cpu_data[smp_processor_id()];
  struct _pcb * p=ctl_gl_pcb;
  /** allocate acb and fill it */
  struct _acb * a=kmalloc(sizeof(struct _acb),GFP_KERNEL);
  memset(a,0,sizeof(struct _acb));
  a->acb_l_pid=p->pcb$l_pid;
  a->acb_l_ast=astadr;
  a->acb_l_astprm=astprm;
  if (p->psl_prv_mod > acmode)
    acmode = p->psl_prv_mod;
  a->acb_b_rmod=acmode;
  /** call sch_qast */
  sch_qast(p->pcb$l_pid,PRI$_NULL,a);
  return SS__NORMAL;
}

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