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

44 lines
1.3 KiB
C

/* The system call implemented in this file:
* m_type: SYS_GETMAP
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (process to get map of)
* m1_p1: PR_MEM_PTR (copy the memory map here)
*/
#include "../kernel.h"
#include "../system.h"
INIT_ASSERT
/*===========================================================================*
* do_getmap *
*===========================================================================*/
PUBLIC int do_getmap(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_getmap(). Report the memory map to MM. */
register struct proc *rp;
phys_bytes dst_phys;
int caller; /* where the map has to be stored */
int k; /* process whose map is to be loaded */
struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
/* Extract message parameters and copy new memory map to MM. */
caller = m_ptr->m_source;
k = m_ptr->PR_PROC_NR;
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
assert(isokprocn(k)); /* unlikely: MM sends a bad proc nr. */
rp = proc_addr(k); /* ptr to entry of the map */
/* Copy the map to MM. */
dst_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
assert(dst_phys != 0);
phys_copy(vir2phys(rp->p_map), dst_phys, sizeof(rp->p_map));
return(OK);
}