minix/kernel/system/do_newmap.c
Ben Gras c078ec0331 Basic VM and other minor improvements.
Not complete, probably not fully debugged or optimized.
2008-11-19 12:26:10 +00:00

54 lines
1.6 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 "../system.h"
#include <minix/endpoint.h>
#if USE_NEWMAP
/*===========================================================================*
* do_newmap *
*===========================================================================*/
PUBLIC int do_newmap(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_newmap(). Fetch the memory map. */
register struct proc *rp; /* process whose map is to be loaded */
struct mem_map *map_ptr; /* virtual address of map inside caller */
phys_bytes src_phys; /* physical address of map at the */
int proc;
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
if (! isokendpt(m_ptr->PR_ENDPT, &proc)) return(EINVAL);
if (iskerneln(proc)) return(EPERM);
rp = proc_addr(proc);
return newmap(rp, map_ptr);
}
/*===========================================================================*
* newmap *
*===========================================================================*/
PUBLIC int newmap(rp, map_ptr)
struct proc *rp; /* process whose map is to be loaded */
struct mem_map *map_ptr; /* virtual address of map inside caller */
{
int r;
/* Fetch the memory map. */
if((r=data_copy(who_e, (vir_bytes) map_ptr,
SYSTEM, (vir_bytes) rp->p_memmap, sizeof(rp->p_memmap))) != OK) {
kprintf("newmap: data_copy failed! (%d)\n", r);
return r;
}
alloc_segments(rp);
return(OK);
}
#endif /* USE_NEWMAP */