lib/libsys/sys_umap_remote.c

   1 #include "syslib.h"
   2
   3 /*===========================================================================*
   4  *                                sys_umap_remote                            *
   5  *===========================================================================*/
   6 int sys_umap_remote(proc_ep, grantee, seg, vir_addr, bytes, phys_addr)
   7 endpoint_t proc_ep;                     /* process number to do umap for */
   8 endpoint_t grantee;                     /* process nr to check as grantee */
   9 int seg;                                /* T, D, or S segment */
  10 vir_bytes vir_addr;                     /* address in bytes with segment*/
  11 vir_bytes bytes;                        /* number of bytes to be copied */
  12 phys_bytes *phys_addr;                  /* placeholder for result */
  13 {
  14     message m;
  15     int result;
  16
  17     /* Note about the grantee parameter:
  18      * - Is ignored for non-grant umap calls, but should be SELF to
  19      *   pass the sanity check in that case;
  20      * - May be SELF to get the same behaviour as sys_umap, namely that the
  21      *   caller must be the grantee;
  22      * - In all other cases, should be a valid endpoint (neither ANY nor NONE).
  23      */
  24
  25     m.CP_SRC_ENDPT = proc_ep;
  26     m.CP_DST_ENDPT = grantee;
  27     m.UMAP_SEG = seg;
  28     m.CP_SRC_ADDR = vir_addr;
  29     m.CP_NR_BYTES = bytes;
  30
  31     result = _kernel_call(SYS_UMAP_REMOTE, &m);
  32     *phys_addr = m.CP_DST_ADDR;
  33     return(result);
  34 }
  35