minix/lib/libsys/sys_vircopy.c
Ben Gras 0fb2f83da9 drop from segments physcopy/vircopy invocations
. sys_vircopy always uses D for both src and dst
	. sys_physcopy uses PHYS_SEG if and only if corresponding
	  endpoint is NONE, so we can derive the mode (PHYS_SEG or D)
	  from the endpoint arg in the kernel, dropping the seg args
	. fields in msg still filled in for backwards compatability,
	  using same NONE-logic in the library
2012-06-18 12:28:40 +00:00

30 lines
970 B
C

#include "syslib.h"
int sys_vircopy(src_proc, src_vir,
dst_proc, dst_vir, bytes)
endpoint_t src_proc; /* source process */
vir_bytes src_vir; /* source virtual address */
endpoint_t dst_proc; /* destination process */
vir_bytes dst_vir; /* destination virtual address */
phys_bytes bytes; /* how many bytes */
{
/* Transfer a block of data. The source and destination can each either be a
* process number or SELF (to indicate own process number). Virtual addresses
* are offsets within LOCAL_SEG (text, stack, data), or BIOS_SEG.
*/
message copy_mess;
if (bytes == 0L) return(OK);
copy_mess.CP_SRC_ENDPT = src_proc;
copy_mess.CP_SRC_ADDR = (long) src_vir;
copy_mess.CP_DST_ENDPT = dst_proc;
copy_mess.CP_DST_ADDR = (long) dst_vir;
copy_mess.CP_NR_BYTES = (long) bytes;
/* backwards compatability D segs */
copy_mess.CP_DST_SPACE_OBSOLETE = D;
copy_mess.CP_SRC_SPACE_OBSOLETE = D;
return(_kernel_call(SYS_VIRCOPY, &copy_mess));
}