minix/kernel/system/do_newmap.c
2012-03-25 21:58:14 +02:00

50 lines
1.5 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_NEWMAP
*
* The parameters for this kernel call are:
* m1_i1: PR_ENDPT (install new map for this process)
* m1_p1: PR_MEM_PTR (pointer to the new memory map)
*/
#include "kernel/system.h"
#include <minix/endpoint.h>
#if USE_NEWMAP
/*===========================================================================*
* do_newmap *
*===========================================================================*/
int do_newmap(struct proc * caller, message * m_ptr)
{
/* Handle sys_newmap(). Fetch the memory map. */
struct proc *rp; /* process whose map is to be loaded */
struct mem_map *map_ptr; /* virtual address of map inside caller */
int proc_nr;
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
if (! isokendpt(m_ptr->PR_ENDPT, &proc_nr)) return(EINVAL);
if (iskerneln(proc_nr)) return(EPERM);
rp = proc_addr(proc_nr);
return newmap(caller, rp, map_ptr);
}
/*===========================================================================*
* newmap *
*===========================================================================*/
int newmap(struct proc *caller, struct proc *rp, struct mem_map *map_ptr)
{
int r;
/* Fetch the memory map. */
if((r=data_copy(caller->p_endpoint, (vir_bytes) map_ptr,
KERNEL, (vir_bytes) rp->p_memmap, sizeof(rp->p_memmap))) != OK) {
printf("newmap: data_copy failed! (%d)\n", r);
return r;
}
alloc_segments(rp);
return(OK);
}
#endif /* USE_NEWMAP */