minix/kernel/system/old/do_umap.c
2005-04-21 14:53:53 +00:00

33 lines
1.1 KiB
C

/* The system call implemented in this file:
* m_type: SYS_UMAP
*
* The parameters for this system call are:
* m5_i1: CP_SRC_PROC_NR (process number)
* m5_c1: CP_SRC_SPACE (segment where address is: T, D, or S)
* m5_l1: CP_SRC_ADDR (virtual address)
* m5_l2: CP_DST_ADDR (returns physical address)
* m5_l3: CP_NR_BYTES (size of datastructure)
*/
#include "../kernel.h"
#include "../system.h"
/*==========================================================================*
* do_umap *
*==========================================================================*/
PUBLIC int do_umap(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Same as umap_local(), for non-kernel processes. */
int proc_nr = (int) m_ptr->CP_SRC_PROC_NR;
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
if (! isokprocn(proc_nr)) return(EINVAL);
m_ptr->CP_DST_ADDR = umap_local(proc_addr(proc_nr),
(int) m_ptr->CP_SRC_SPACE,
(vir_bytes) m_ptr->CP_SRC_ADDR,
(vir_bytes) m_ptr->CP_NR_BYTES);
return(OK);
}