lib/libsys/sys_physcopy.c

   1 #include "syslib.h"
   2
   3 int sys_physcopy(src_proc, src_vir, dst_proc, dst_vir, bytes)
   4 endpoint_t src_proc;            /* source process */
   5 vir_bytes src_vir;              /* source virtual address */
   6 endpoint_t dst_proc;            /* destination process */
   7 vir_bytes dst_vir;              /* destination virtual address */
   8 phys_bytes bytes;               /* how many bytes */
   9 {
  10 /* Transfer a block of data.  The source and destination can each either be a
  11  * process number or SELF (to indicate own process number). Virtual addresses
  12  * are offsets within LOCAL_SEG (text, stack, data), or BIOS_SEG.
  13  * Physicall addressing is also possible with PHYS_SEG.
  14  */
  15
  16   message copy_mess;
  17
  18   if (bytes == 0L) return(OK);
  19   copy_mess.CP_SRC_ENDPT = src_proc;
  20   copy_mess.CP_SRC_ADDR = (long) src_vir;
  21   copy_mess.CP_DST_ENDPT = dst_proc;
  22   copy_mess.CP_DST_ADDR = (long) dst_vir;
  23   copy_mess.CP_NR_BYTES = (long) bytes;
  24
  25   /* provide backwards compatability arguments to old
  26    * kernels based on process id's; NONE <=> physical
  27    */
  28   copy_mess.CP_DST_SPACE_OBSOLETE = (dst_proc == NONE ? PHYS_SEG : D_OBSOLETE);
  29   copy_mess.CP_SRC_SPACE_OBSOLETE = (src_proc == NONE ? PHYS_SEG : D_OBSOLETE);
  30
  31   return(_kernel_call(SYS_PHYSCOPY, &copy_mess));
  32 }