sys/src/svapte.c

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// _Id: svapte.c,v 1.1 2008-01-06 07:58:38 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.

// everything is untested

#include<linux/linkage.h>
#include<linux/mm.h>
#include<linux/sched.h>
#include<internals.h>
#include<ipldef.h>
#include<rdedef.h>
#include<ssdef.h>

int mmg_pteref_64 (void * va, struct _rde *rde, void ** va_pte) {
  if (va < rde->rde_ps_start_va || va >= (rde->rde$ps_start_va + rde->rde$l_region_size))
    return SS__LENVIO;
  struct mm_struct *mm = ctl_gl_pcb->mm;
  long page, address;
  pgd_t *pgd;
  pud_t *pud;
  pmd_t *pmd;
  pte_t *pte;
  address = va;
  page = address & PAGE_MASK;
  pgd = pgd_offset(mm, page);
  pud = pud_offset(pgd, page);
  pmd = pmd_offset(pud, page);
  pte = pte_offset(pmd, page);

  int ipl = vmslock(&SPIN_MMG, IPL__MMG);

  *va_pte = pte;

  return SS__NORMAL; // with mmg spinlock still held
}

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