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

52 lines
1.6 KiB
C

/* The system call implemented in this file:
* m_type: SYS_NEWMAP
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (install new map for this process)
* m1_p1: PR_MEM_PTR (pointer to memory map)
*/
#include "../kernel.h"
#include "../system.h"
INIT_ASSERT
/*===========================================================================*
* do_newmap *
*===========================================================================*/
PUBLIC int do_newmap(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_newmap(). Fetch the memory map from MM. */
register struct proc *rp;
phys_bytes src_phys;
int caller; /* whose space has the new map (usually MM) */
int k; /* process whose map is to be loaded */
int old_flags; /* value of flags before modification */
struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
/* Extract message parameters and copy new memory map from MM. */
caller = m_ptr->m_source;
k = m_ptr->PR_PROC_NR;
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
if (!isokprocn(k)) return(EINVAL);
rp = proc_addr(k); /* ptr to entry of user getting new map */
/* Copy the map from MM. */
src_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
assert(src_phys != 0);
phys_copy(src_phys, vir2phys(rp->p_map), (phys_bytes) sizeof(rp->p_map));
#if (CHIP != M68000)
alloc_segments(rp);
#else
pmmu_init_proc(rp);
#endif
old_flags = rp->p_flags; /* save the previous value of the flags */
rp->p_flags &= ~NO_MAP;
if (old_flags != 0 && rp->p_flags == 0) lock_ready(rp);
return(OK);
}