kernel/system/do_newmap.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_NEWMAP
   3  *
   4  * The parameters for this kernel call are:
   5  *    m1_i1:    PR_ENDPT                (install new map for this process)
   6  *    m1_p1:    PR_MEM_PTR              (pointer to the new memory map)
   7  */
   8 #include "../system.h"
   9 #include <minix/endpoint.h>
  10
  11 #if USE_NEWMAP
  12
  13 /*===========================================================================*
  14  *                              do_newmap                                    *
  15  *===========================================================================*/
  16 PUBLIC int do_newmap(m_ptr)
  17 message *m_ptr;                 /* pointer to request message */
  18 {
  19 /* Handle sys_newmap().  Fetch the memory map from PM. */
  20   register struct proc *rp;     /* process whose map is to be loaded */
  21   struct mem_map *map_ptr;      /* virtual address of map inside caller (PM) */
  22   phys_bytes src_phys;          /* physical address of map at the PM */
  23   int proc;
  24
  25   map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
  26   if (! isokendpt(m_ptr->PR_ENDPT, &proc)) return(EINVAL);
  27   if (iskerneln(proc)) return(EPERM);
  28   rp = proc_addr(proc);
  29
  30   return newmap(rp, map_ptr);
  31 }
  32
  33
  34 /*===========================================================================*
  35  *                              newmap                                       *
  36  *===========================================================================*/
  37 PUBLIC int newmap(rp, map_ptr)
  38 struct proc *rp;                /* process whose map is to be loaded */
  39 struct mem_map *map_ptr;        /* virtual address of map inside caller (PM) */
  40 {
  41 /* Fetch the memory map from PM. */
  42   phys_bytes src_phys;          /* physical address of map at the PM */
  43   int proc;
  44
  45   /* Copy the map from PM. */
  46   src_phys = umap_local(proc_addr(who_p), D, (vir_bytes) map_ptr,
  47       sizeof(rp->p_memmap));
  48   if (src_phys == 0) return(EFAULT);
  49   phys_copy(src_phys,vir2phys(rp->p_memmap),
  50         (phys_bytes)sizeof(rp->p_memmap));
  51
  52   alloc_segments(rp);
  53
  54   return(OK);
  55 }
  56 #endif /* USE_NEWMAP */
  57