minix/lib/libsys/sys_umap_remote.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

35 lines
1.2 KiB
C
Executable file

#include "syslib.h"
/*===========================================================================*
* sys_umap_remote *
*===========================================================================*/
int sys_umap_remote(proc_ep, grantee, seg, vir_addr, bytes, phys_addr)
endpoint_t proc_ep; /* process number to do umap for */
endpoint_t grantee; /* process nr to check as grantee */
int seg; /* T, D, or S segment */
vir_bytes vir_addr; /* address in bytes with segment*/
vir_bytes bytes; /* number of bytes to be copied */
phys_bytes *phys_addr; /* placeholder for result */
{
message m;
int result;
/* Note about the grantee parameter:
* - Is ignored for non-grant umap calls, but should be SELF to
* pass the sanity check in that case;
* - May be SELF to get the same behaviour as sys_umap, namely that the
* caller must be the grantee;
* - In all other cases, should be a valid endpoint (neither ANY nor NONE).
*/
m.CP_SRC_ENDPT = proc_ep;
m.CP_DST_ENDPT = grantee;
m.UMAP_SEG = seg;
m.CP_SRC_ADDR = vir_addr;
m.CP_NR_BYTES = bytes;
result = _kernel_call(SYS_UMAP_REMOTE, &m);
*phys_addr = m.CP_DST_ADDR;
return(result);
}